3 import java.util.Iterator;
4 import java.util.Random;
5 import java.util.Arrays;
9 import java.util.Vector;
10 import java.util.HashMap;
11 import java.util.HashSet;
12 import java.util.ArrayList;
13 import java.util.Collections;
14 import java.nio.ByteBuffer;
15 import android.content.*;
18 * IoTTable data structure. Provides client interface.
19 * @author Brian Demsky
23 final public class Table {
26 static final int FREE_SLOTS = 10; // Number of slots that should be kept free
27 static final int SKIP_THRESHOLD = 10;
28 static final double RESIZE_MULTIPLE = 1.2;
29 static final double RESIZE_THRESHOLD = 0.75;
30 static final int REJECTED_THRESHOLD = 5;
33 private SlotBuffer buffer = null;
34 private CloudComm cloud = null;
35 private Random random = null;
36 private TableStatus liveTableStatus = null;
37 private PendingTransaction pendingTransactionBuilder = null; // Pending Transaction used in building a Pending Transaction
38 private Transaction lastPendingTransactionSpeculatedOn = null; // Last transaction that was speculated on from the pending transaction
39 private Transaction firstPendingTransaction = null; // first transaction in the pending transaction list
42 private int numberOfSlots = 0; // Number of slots stored in buffer
43 private int bufferResizeThreshold = 0; // Threshold on the number of live slots before a resize is needed
44 private long liveSlotCount = 0; // Number of currently live slots
45 private long oldestLiveSlotSequenceNumver = 0; // Smallest sequence number of the slot with a live entry
46 private long localMachineId = 0; // Machine ID of this client device
47 private long sequenceNumber = 0; // Largest sequence number a client has received
48 private long localSequenceNumber = 0;
50 // private int smallestTableStatusSeen = -1; // Smallest Table Status that was seen in the latest slots sent from the server
51 // private int largestTableStatusSeen = -1; // Largest Table Status that was seen in the latest slots sent from the server
52 private long localTransactionSequenceNumber = 0; // Local sequence number counter for transactions
53 private long lastTransactionSequenceNumberSpeculatedOn = -1; // the last transaction that was speculated on
54 private long oldestTransactionSequenceNumberSpeculatedOn = -1; // the oldest transaction that was speculated on
55 private long localArbitrationSequenceNumber = 0;
56 private boolean hadPartialSendToServer = false;
57 private boolean attemptedToSendToServer = false;
58 private long expectedsize;
59 private boolean didFindTableStatus = false;
60 private long currMaxSize = 0;
62 private Slot lastSlotAttemptedToSend = null;
63 private boolean lastIsNewKey = false;
64 private int lastNewSize = 0;
65 private Map<Transaction, List<Integer>> lastTransactionPartsSent = null;
66 private List<Entry> lastPendingSendArbitrationEntriesToDelete = null;
67 private NewKey lastNewKey = null;
71 private Map<IoTString, KeyValue> committedKeyValueTable = null; // Table of committed key value pairs
72 private Map<IoTString, KeyValue> speculatedKeyValueTable = null; // Table of speculated key value pairs, if there is a speculative value
73 private Map<IoTString, KeyValue> pendingTransactionSpeculatedKeyValueTable = null; // Table of speculated key value pairs, if there is a speculative value from the pending transactions
74 private Map<IoTString, NewKey> liveNewKeyTable = null; // Table of live new keys
75 private HashMap<Long, Pair<Long, Liveness>> lastMessageTable = null; // Last message sent by a client machine id -> (Seq Num, Slot or LastMessage);
76 private HashMap<Long, HashSet<RejectedMessage>> rejectedMessageWatchListTable = null; // Table of machine Ids and the set of rejected messages they have not seen yet
77 private Map<IoTString, Long> arbitratorTable = null; // Table of keys and their arbitrators
78 private Map<Pair<Long, Long>, Abort> liveAbortTable = null; // Table live abort messages
79 private Map<Long, Map<Pair<Long, Integer>, TransactionPart>> newTransactionParts = null; // transaction parts that are seen in this latest round of slots from the server
80 private Map<Long, Map<Pair<Long, Integer>, CommitPart>> newCommitParts = null; // commit parts that are seen in this latest round of slots from the server
81 private Map<Long, Long> lastArbitratedTransactionNumberByArbitratorTable = null; // Last transaction sequence number that an arbitrator arbitrated on
82 private Map<Long, Transaction> liveTransactionBySequenceNumberTable = null; // live transaction grouped by the sequence number
83 private Map<Pair<Long, Long>, Transaction> liveTransactionByTransactionIdTable = null; // live transaction grouped by the transaction ID
84 private Map<Long, Map<Long, Commit>> liveCommitsTable = null;
85 private Map<IoTString, Commit> liveCommitsByKeyTable = null;
86 private Map<Long, Long> lastCommitSeenSequenceNumberByArbitratorTable = null;
87 private Vector<Long> rejectedSlotList = null; // List of rejected slots that have yet to be sent to the server
88 private List<Transaction> pendingTransactionQueue = null;
89 private List<ArbitrationRound> pendingSendArbitrationRounds = null;
90 private List<Entry> pendingSendArbitrationEntriesToDelete = null;
91 private Map<Transaction, List<Integer>> transactionPartsSent = null;
92 private Map<Long, TransactionStatus> outstandingTransactionStatus = null;
93 private Map<Long, Abort> liveAbortsGeneratedByLocal = null;
94 private Set<Pair<Long, Long>> offlineTransactionsCommittedAndAtServer = null;
95 private Map<Long, Pair<String, Integer>> localCommunicationTable = null;
96 private Map<Long, Long> lastTransactionSeenFromMachineFromServer = null;
97 private Map<Long, Long> lastArbitrationDataLocalSequenceNumberSeenFromArbitrator = null;
100 public Table(String baseurl, String password, long _localMachineId, int listeningPort, Context context) {
101 localMachineId = _localMachineId;
102 cloud = new CloudComm(this, baseurl, password, listeningPort, context);
107 public Table(CloudComm _cloud, long _localMachineId) {
108 localMachineId = _localMachineId;
115 * Init all the stuff needed for for table usage
117 private void init() {
119 // Init helper objects
120 random = new Random();
121 buffer = new SlotBuffer();
124 oldestLiveSlotSequenceNumver = 1;
127 committedKeyValueTable = new HashMap<IoTString, KeyValue>();
128 speculatedKeyValueTable = new HashMap<IoTString, KeyValue>();
129 pendingTransactionSpeculatedKeyValueTable = new HashMap<IoTString, KeyValue>();
130 liveNewKeyTable = new HashMap<IoTString, NewKey>();
131 lastMessageTable = new HashMap<Long, Pair<Long, Liveness>>();
132 rejectedMessageWatchListTable = new HashMap<Long, HashSet<RejectedMessage>>();
133 arbitratorTable = new HashMap<IoTString, Long>();
134 liveAbortTable = new HashMap<Pair<Long, Long>, Abort>();
135 newTransactionParts = new HashMap<Long, Map<Pair<Long, Integer>, TransactionPart>>();
136 newCommitParts = new HashMap<Long, Map<Pair<Long, Integer>, CommitPart>>();
137 lastArbitratedTransactionNumberByArbitratorTable = new HashMap<Long, Long>();
138 liveTransactionBySequenceNumberTable = new HashMap<Long, Transaction>();
139 liveTransactionByTransactionIdTable = new HashMap<Pair<Long, Long>, Transaction>();
140 liveCommitsTable = new HashMap<Long, Map<Long, Commit>>();
141 liveCommitsByKeyTable = new HashMap<IoTString, Commit>();
142 lastCommitSeenSequenceNumberByArbitratorTable = new HashMap<Long, Long>();
143 rejectedSlotList = new Vector<Long>();
144 pendingTransactionQueue = new ArrayList<Transaction>();
145 pendingSendArbitrationEntriesToDelete = new ArrayList<Entry>();
146 transactionPartsSent = new HashMap<Transaction, List<Integer>>();
147 outstandingTransactionStatus = new HashMap<Long, TransactionStatus>();
148 liveAbortsGeneratedByLocal = new HashMap<Long, Abort>();
149 offlineTransactionsCommittedAndAtServer = new HashSet<Pair<Long, Long>>();
150 localCommunicationTable = new HashMap<Long, Pair<String, Integer>>();
151 lastTransactionSeenFromMachineFromServer = new HashMap<Long, Long>();
152 pendingSendArbitrationRounds = new ArrayList<ArbitrationRound>();
153 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator = new HashMap<Long, Long>();
157 numberOfSlots = buffer.capacity();
158 setResizeThreshold();
161 // TODO: delete method
162 public synchronized void printSlots() {
163 long o = buffer.getOldestSeqNum();
164 long n = buffer.getNewestSeqNum();
166 int[] types = new int[10];
177 for (long i = o; i < (n + 1); i++) {
178 Slot s = buffer.getSlot(i);
185 Vector<Entry> entries = s.getEntries();
187 for (Entry e : entries) {
189 int type = e.getType();
193 RejectedMessage rej = (RejectedMessage)e;
196 System.out.println(rej.getMachineID());
200 types[type] = types[type] + 1;
209 for (int i = 0; i < 10; i++) {
210 System.out.println(i + " " + types[i]);
212 System.out.println("Live count: " + livec);
213 System.out.println("Live Slot count: " + liveslo);
215 System.out.println("Dead count: " + deadc);
216 System.out.println("Old: " + o);
217 System.out.println("New: " + n);
218 System.out.println("Size: " + buffer.size());
219 // System.out.println("Commits: " + liveCommitsTable.size());
220 System.out.println("pendingTrans: " + pendingTransactionQueue.size());
221 System.out.println("Trans Status Out: " + outstandingTransactionStatus.size());
223 for (Long k : lastArbitratedTransactionNumberByArbitratorTable.keySet()) {
224 System.out.println(k + ": " + lastArbitratedTransactionNumberByArbitratorTable.get(k));
228 for (Long a : liveCommitsTable.keySet()) {
229 for (Long b : liveCommitsTable.get(a).keySet()) {
230 for (KeyValue kv : liveCommitsTable.get(a).get(b).getKeyValueUpdateSet()) {
231 System.out.print(kv + " ");
233 System.out.print("|| ");
235 System.out.println();
241 * Initialize the table by inserting a table status as the first entry into the table status
242 * also initialize the crypto stuff.
244 public synchronized void initTable() throws ServerException {
245 cloud.initSecurity();
247 // Create the first insertion into the block chain which is the table status
248 Slot s = new Slot(this, 1, localMachineId, localSequenceNumber);
249 localSequenceNumber++;
250 TableStatus status = new TableStatus(s, numberOfSlots);
252 Slot[] array = cloud.putSlot(s, numberOfSlots);
255 array = new Slot[] {s};
256 // update local block chain
257 validateAndUpdate(array, true);
258 } else if (array.length == 1) {
259 // in case we did push the slot BUT we failed to init it
260 validateAndUpdate(array, true);
262 throw new Error("Error on initialization");
267 * Rebuild the table from scratch by pulling the latest block chain from the server.
269 public synchronized void rebuild() throws ServerException {
270 // Just pull the latest slots from the server
271 Slot[] newslots = cloud.getSlots(sequenceNumber + 1);
272 validateAndUpdate(newslots, true);
274 updateLiveTransactionsAndStatus();
278 // public String toString() {
279 // String retString = " Committed Table: \n";
280 // retString += "---------------------------\n";
281 // retString += commitedTable.toString();
283 // retString += "\n\n";
285 // retString += " Speculative Table: \n";
286 // retString += "---------------------------\n";
287 // retString += speculativeTable.toString();
292 public synchronized void addLocalCommunication(long arbitrator, String hostName, int portNumber) {
293 localCommunicationTable.put(arbitrator, new Pair<String, Integer>(hostName, portNumber));
296 public synchronized Long getArbitrator(IoTString key) {
297 return arbitratorTable.get(key);
300 public synchronized void close() {
304 public synchronized IoTString getCommitted(IoTString key) {
305 KeyValue kv = committedKeyValueTable.get(key);
308 return kv.getValue();
314 public synchronized IoTString getSpeculative(IoTString key) {
315 KeyValue kv = pendingTransactionSpeculatedKeyValueTable.get(key);
318 kv = speculatedKeyValueTable.get(key);
322 kv = committedKeyValueTable.get(key);
326 return kv.getValue();
332 public synchronized IoTString getCommittedAtomic(IoTString key) {
333 KeyValue kv = committedKeyValueTable.get(key);
335 if (arbitratorTable.get(key) == null) {
336 throw new Error("Key not Found.");
339 // Make sure new key value pair matches the current arbitrator
340 if (!pendingTransactionBuilder.checkArbitrator(arbitratorTable.get(key))) {
341 // TODO: Maybe not throw en error
342 throw new Error("Not all Key Values Match Arbitrator.");
346 pendingTransactionBuilder.addKVGuard(new KeyValue(key, kv.getValue()));
347 return kv.getValue();
349 pendingTransactionBuilder.addKVGuard(new KeyValue(key, null));
354 public synchronized IoTString getSpeculativeAtomic(IoTString key) {
355 if (arbitratorTable.get(key) == null) {
356 throw new Error("Key not Found.");
359 // Make sure new key value pair matches the current arbitrator
360 if (!pendingTransactionBuilder.checkArbitrator(arbitratorTable.get(key))) {
361 // TODO: Maybe not throw en error
362 throw new Error("Not all Key Values Match Arbitrator.");
365 KeyValue kv = pendingTransactionSpeculatedKeyValueTable.get(key);
368 kv = speculatedKeyValueTable.get(key);
372 kv = committedKeyValueTable.get(key);
376 pendingTransactionBuilder.addKVGuard(new KeyValue(key, kv.getValue()));
377 return kv.getValue();
379 pendingTransactionBuilder.addKVGuard(new KeyValue(key, null));
384 public synchronized boolean update() {
386 Slot[] newSlots = cloud.getSlots(sequenceNumber + 1);
387 validateAndUpdate(newSlots, false);
391 updateLiveTransactionsAndStatus();
394 } catch (Exception e) {
395 // e.printStackTrace();
397 for (Long m : localCommunicationTable.keySet()) {
405 public synchronized boolean createNewKey(IoTString keyName, long machineId) throws ServerException {
407 if (arbitratorTable.get(keyName) != null) {
408 // There is already an arbitrator
412 NewKey newKey = new NewKey(null, keyName, machineId);
414 if (sendToServer(newKey)) {
415 // If successfully inserted
421 public synchronized void startTransaction() {
422 // Create a new transaction, invalidates any old pending transactions.
423 pendingTransactionBuilder = new PendingTransaction(localMachineId);
426 public synchronized void addKV(IoTString key, IoTString value) {
428 // Make sure it is a valid key
429 if (arbitratorTable.get(key) == null) {
430 throw new Error("Key not Found.");
433 // Make sure new key value pair matches the current arbitrator
434 if (!pendingTransactionBuilder.checkArbitrator(arbitratorTable.get(key))) {
435 // TODO: Maybe not throw en error
436 throw new Error("Not all Key Values Match Arbitrator.");
439 // Add the key value to this transaction
440 KeyValue kv = new KeyValue(key, value);
441 pendingTransactionBuilder.addKV(kv);
444 public synchronized TransactionStatus commitTransaction() {
446 if (pendingTransactionBuilder.getKVUpdates().size() == 0) {
447 // transaction with no updates will have no effect on the system
448 return new TransactionStatus(TransactionStatus.StatusNoEffect, -1);
451 // Set the local transaction sequence number and increment
452 pendingTransactionBuilder.setClientLocalSequenceNumber(localTransactionSequenceNumber);
453 localTransactionSequenceNumber++;
455 // Create the transaction status
456 TransactionStatus transactionStatus = new TransactionStatus(TransactionStatus.StatusPending, pendingTransactionBuilder.getArbitrator());
458 // Create the new transaction
459 Transaction newTransaction = pendingTransactionBuilder.createTransaction();
460 newTransaction.setTransactionStatus(transactionStatus);
462 if (pendingTransactionBuilder.getArbitrator() != localMachineId) {
463 // Add it to the queue and invalidate the builder for safety
464 pendingTransactionQueue.add(newTransaction);
466 arbitrateOnLocalTransaction(newTransaction);
467 updateLiveStateFromLocal();
470 pendingTransactionBuilder = new PendingTransaction(localMachineId);
474 } catch (ServerException e) {
476 Set<Long> arbitratorTriedAndFailed = new HashSet<Long>();
477 for (Iterator<Transaction> iter = pendingTransactionQueue.iterator(); iter.hasNext(); ) {
478 Transaction transaction = iter.next();
480 if (arbitratorTriedAndFailed.contains(transaction.getArbitrator())) {
481 // Already contacted this client so ignore all attempts to contact this client
482 // to preserve ordering for arbitrator
486 Pair<Boolean, Boolean> sendReturn = sendTransactionToLocal(transaction);
488 if (sendReturn.getFirst()) {
489 // Failed to contact over local
490 arbitratorTriedAndFailed.add(transaction.getArbitrator());
492 // Successful contact or should not contact
494 if (sendReturn.getSecond()) {
502 updateLiveStateFromLocal();
504 return transactionStatus;
508 * Get the machine ID for this client
510 public long getMachineId() {
511 return localMachineId;
515 * Decrement the number of live slots that we currently have
517 public void decrementLiveCount() {
522 * Recalculate the new resize threshold
524 private void setResizeThreshold() {
525 int resizeLower = (int) (RESIZE_THRESHOLD * numberOfSlots);
526 bufferResizeThreshold = resizeLower - 1 + random.nextInt(numberOfSlots - resizeLower);
529 public long getLocalSequenceNumber() {
530 return localSequenceNumber;
534 boolean lastInsertedNewKey = false;
536 private boolean sendToServer(NewKey newKey) throws ServerException {
538 boolean fromRetry = false;
541 if (hadPartialSendToServer) {
542 Slot[] newSlots = cloud.getSlots(sequenceNumber + 1);
543 if (newSlots.length == 0) {
545 ThreeTuple<Boolean, Boolean, Slot[]> sendSlotsReturn = sendSlotsToServer(lastSlotAttemptedToSend, lastNewSize, lastIsNewKey);
547 if (sendSlotsReturn.getFirst()) {
548 if (newKey != null) {
549 if (lastInsertedNewKey && (lastNewKey.getKey() == newKey.getKey()) && (lastNewKey.getMachineID() == newKey.getMachineID())) {
554 for (Transaction transaction : lastTransactionPartsSent.keySet()) {
555 transaction.resetServerFailure();
557 // Update which transactions parts still need to be sent
558 transaction.removeSentParts(lastTransactionPartsSent.get(transaction));
560 // Add the transaction status to the outstanding list
561 outstandingTransactionStatus.put(transaction.getSequenceNumber(), transaction.getTransactionStatus());
563 // Update the transaction status
564 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentPartial);
566 // Check if all the transaction parts were successfully sent and if so then remove it from pending
567 if (transaction.didSendAllParts()) {
568 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentFully);
569 pendingTransactionQueue.remove(transaction);
574 newSlots = sendSlotsReturn.getThird();
576 boolean isInserted = false;
577 for (Slot s : newSlots) {
578 if ((s.getSequenceNumber() == lastSlotAttemptedToSend.getSequenceNumber()) && (s.getMachineID() == localMachineId)) {
584 for (Slot s : newSlots) {
589 // Process each entry in the slot
590 for (Entry entry : s.getEntries()) {
592 if (entry.getType() == Entry.TypeLastMessage) {
593 LastMessage lastMessage = (LastMessage)entry;
594 if ((lastMessage.getMachineID() == localMachineId) && (lastMessage.getSequenceNumber() == lastSlotAttemptedToSend.getSequenceNumber())) {
603 if (newKey != null) {
604 if (lastInsertedNewKey && (lastNewKey.getKey() == newKey.getKey()) && (lastNewKey.getMachineID() == newKey.getMachineID())) {
609 for (Transaction transaction : lastTransactionPartsSent.keySet()) {
610 transaction.resetServerFailure();
612 // Update which transactions parts still need to be sent
613 transaction.removeSentParts(lastTransactionPartsSent.get(transaction));
615 // Add the transaction status to the outstanding list
616 outstandingTransactionStatus.put(transaction.getSequenceNumber(), transaction.getTransactionStatus());
618 // Update the transaction status
619 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentPartial);
621 // Check if all the transaction parts were successfully sent and if so then remove it from pending
622 if (transaction.didSendAllParts()) {
623 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentFully);
624 pendingTransactionQueue.remove(transaction);
626 transaction.resetServerFailure();
627 // Set the transaction sequence number back to nothing
628 if (!transaction.didSendAPartToServer()) {
629 transaction.setSequenceNumber(-1);
636 for (Transaction transaction : lastTransactionPartsSent.keySet()) {
637 transaction.resetServerFailure();
638 // Set the transaction sequence number back to nothing
639 if (!transaction.didSendAPartToServer()) {
640 transaction.setSequenceNumber(-1);
644 if (sendSlotsReturn.getThird().length != 0) {
645 // insert into the local block chain
646 validateAndUpdate(sendSlotsReturn.getThird(), true);
650 boolean isInserted = false;
651 for (Slot s : newSlots) {
652 if ((s.getSequenceNumber() == lastSlotAttemptedToSend.getSequenceNumber()) && (s.getMachineID() == localMachineId)) {
658 for (Slot s : newSlots) {
663 // Process each entry in the slot
664 for (Entry entry : s.getEntries()) {
666 if (entry.getType() == Entry.TypeLastMessage) {
667 LastMessage lastMessage = (LastMessage)entry;
668 if ((lastMessage.getMachineID() == localMachineId) && (lastMessage.getSequenceNumber() == lastSlotAttemptedToSend.getSequenceNumber())) {
677 if (newKey != null) {
678 if (lastInsertedNewKey && (lastNewKey.getKey() == newKey.getKey()) && (lastNewKey.getMachineID() == newKey.getMachineID())) {
683 for (Transaction transaction : lastTransactionPartsSent.keySet()) {
684 transaction.resetServerFailure();
686 // Update which transactions parts still need to be sent
687 transaction.removeSentParts(lastTransactionPartsSent.get(transaction));
689 // Add the transaction status to the outstanding list
690 outstandingTransactionStatus.put(transaction.getSequenceNumber(), transaction.getTransactionStatus());
692 // Update the transaction status
693 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentPartial);
695 // Check if all the transaction parts were successfully sent and if so then remove it from pending
696 if (transaction.didSendAllParts()) {
697 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentFully);
698 pendingTransactionQueue.remove(transaction);
700 transaction.resetServerFailure();
701 // Set the transaction sequence number back to nothing
702 if (!transaction.didSendAPartToServer()) {
703 transaction.setSequenceNumber(-1);
708 for (Transaction transaction : lastTransactionPartsSent.keySet()) {
709 transaction.resetServerFailure();
710 // Set the transaction sequence number back to nothing
711 if (!transaction.didSendAPartToServer()) {
712 transaction.setSequenceNumber(-1);
717 // insert into the local block chain
718 validateAndUpdate(newSlots, true);
721 } catch (ServerException e) {
728 // While we have stuff that needs inserting into the block chain
729 while ((pendingTransactionQueue.size() > 0) || (pendingSendArbitrationRounds.size() > 0) || (newKey != null)) {
733 if (hadPartialSendToServer) {
734 throw new Error("Should Be error free");
739 // If there is a new key with same name then end
740 if ((newKey != null) && (arbitratorTable.get(newKey.getKey()) != null)) {
745 Slot slot = new Slot(this, sequenceNumber + 1, localMachineId, buffer.getSlot(sequenceNumber).getHMAC(), localSequenceNumber);
746 localSequenceNumber++;
748 // Try to fill the slot with data
749 ThreeTuple<Boolean, Integer, Boolean> fillSlotsReturn = fillSlot(slot, false, newKey);
750 boolean needsResize = fillSlotsReturn.getFirst();
751 int newSize = fillSlotsReturn.getSecond();
752 Boolean insertedNewKey = fillSlotsReturn.getThird();
755 // Reset which transaction to send
756 for (Transaction transaction : transactionPartsSent.keySet()) {
757 transaction.resetNextPartToSend();
759 // Set the transaction sequence number back to nothing
760 if (!transaction.didSendAPartToServer() && !transaction.getServerFailure()) {
761 transaction.setSequenceNumber(-1);
765 // Clear the sent data since we are trying again
766 pendingSendArbitrationEntriesToDelete.clear();
767 transactionPartsSent.clear();
769 // We needed a resize so try again
770 fillSlot(slot, true, newKey);
773 lastSlotAttemptedToSend = slot;
774 lastIsNewKey = (newKey != null);
775 lastInsertedNewKey = insertedNewKey;
776 lastNewSize = newSize;
778 lastTransactionPartsSent = new HashMap<Transaction, List<Integer>>(transactionPartsSent);
779 lastPendingSendArbitrationEntriesToDelete = new ArrayList<Entry>(pendingSendArbitrationEntriesToDelete);
782 ThreeTuple<Boolean, Boolean, Slot[]> sendSlotsReturn = sendSlotsToServer(slot, newSize, newKey != null);
784 if (sendSlotsReturn.getFirst()) {
786 // Did insert into the block chain
788 if (insertedNewKey) {
789 // This slot was what was inserted not a previous slot
791 // New Key was successfully inserted into the block chain so dont want to insert it again
795 // Remove the aborts and commit parts that were sent from the pending to send queue
796 for (Iterator<ArbitrationRound> iter = pendingSendArbitrationRounds.iterator(); iter.hasNext(); ) {
797 ArbitrationRound round = iter.next();
798 round.removeParts(pendingSendArbitrationEntriesToDelete);
800 if (round.isDoneSending()) {
801 // Sent all the parts
806 for (Transaction transaction : transactionPartsSent.keySet()) {
807 transaction.resetServerFailure();
809 // Update which transactions parts still need to be sent
810 transaction.removeSentParts(transactionPartsSent.get(transaction));
812 // Add the transaction status to the outstanding list
813 outstandingTransactionStatus.put(transaction.getSequenceNumber(), transaction.getTransactionStatus());
815 // Update the transaction status
816 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentPartial);
818 // Check if all the transaction parts were successfully sent and if so then remove it from pending
819 if (transaction.didSendAllParts()) {
820 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentFully);
821 pendingTransactionQueue.remove(transaction);
826 // if (!sendSlotsReturn.getSecond()) {
827 // for (Transaction transaction : lastTransactionPartsSent.keySet()) {
828 // transaction.resetServerFailure();
831 // for (Transaction transaction : lastTransactionPartsSent.keySet()) {
832 // transaction.resetServerFailure();
834 // // Update which transactions parts still need to be sent
835 // transaction.removeSentParts(transactionPartsSent.get(transaction));
837 // // Add the transaction status to the outstanding list
838 // outstandingTransactionStatus.put(transaction.getSequenceNumber(), transaction.getTransactionStatus());
840 // // Update the transaction status
841 // transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentPartial);
843 // // Check if all the transaction parts were successfully sent and if so then remove it from pending
844 // if (transaction.didSendAllParts()) {
845 // transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentFully);
846 // pendingTransactionQueue.remove(transaction);
848 // for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
849 // System.out.println("Sent: " + kv + " from: " + localMachineId + " Slot:" + lastSlotAttemptedToSend.getSequenceNumber() + " Claimed:" + transaction.getSequenceNumber());
855 // Reset which transaction to send
856 for (Transaction transaction : transactionPartsSent.keySet()) {
857 transaction.resetNextPartToSend();
858 // transaction.resetNextPartToSend();
860 // Set the transaction sequence number back to nothing
861 if (!transaction.didSendAPartToServer() && !transaction.getServerFailure()) {
862 transaction.setSequenceNumber(-1);
867 // Clear the sent data in preparation for next send
868 pendingSendArbitrationEntriesToDelete.clear();
869 transactionPartsSent.clear();
871 if (sendSlotsReturn.getThird().length != 0) {
872 // insert into the local block chain
873 validateAndUpdate(sendSlotsReturn.getThird(), true);
877 } catch (ServerException e) {
879 if (e.getType() != ServerException.TypeInputTimeout) {
880 // e.printStackTrace();
882 // Nothing was able to be sent to the server so just clear these data structures
883 for (Transaction transaction : transactionPartsSent.keySet()) {
884 transaction.resetNextPartToSend();
886 // Set the transaction sequence number back to nothing
887 if (!transaction.didSendAPartToServer() && !transaction.getServerFailure()) {
888 transaction.setSequenceNumber(-1);
892 // There was a partial send to the server
893 hadPartialSendToServer = true;
897 // lastTransactionPartsSent = new HashMap<Transaction, List<Integer>>(transactionPartsSent);
898 // lastPendingSendArbitrationEntriesToDelete = new ArrayList<Entry>(pendingSendArbitrationEntriesToDelete);
901 // Nothing was able to be sent to the server so just clear these data structures
902 for (Transaction transaction : transactionPartsSent.keySet()) {
903 transaction.resetNextPartToSend();
904 transaction.setServerFailure();
908 pendingSendArbitrationEntriesToDelete.clear();
909 transactionPartsSent.clear();
914 return newKey == null;
917 private synchronized boolean updateFromLocal(long machineId) {
918 Pair<String, Integer> localCommunicationInformation = localCommunicationTable.get(machineId);
919 if (localCommunicationInformation == null) {
920 // Cant talk to that device locally so do nothing
924 // Get the size of the send data
925 int sendDataSize = Integer.BYTES + Long.BYTES;
927 Long lastArbitrationDataLocalSequenceNumber = (long) - 1;
928 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(machineId) != null) {
929 lastArbitrationDataLocalSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(machineId);
932 byte[] sendData = new byte[sendDataSize];
933 ByteBuffer bbEncode = ByteBuffer.wrap(sendData);
936 bbEncode.putLong(lastArbitrationDataLocalSequenceNumber);
940 byte[] returnData = cloud.sendLocalData(sendData, localSequenceNumber, localCommunicationInformation.getFirst(), localCommunicationInformation.getSecond());
941 localSequenceNumber++;
943 if (returnData == null) {
944 // Could not contact server
949 ByteBuffer bbDecode = ByteBuffer.wrap(returnData);
950 int numberOfEntries = bbDecode.getInt();
952 for (int i = 0; i < numberOfEntries; i++) {
953 byte type = bbDecode.get();
954 if (type == Entry.TypeAbort) {
955 Abort abort = (Abort)Abort.decode(null, bbDecode);
957 } else if (type == Entry.TypeCommitPart) {
958 CommitPart commitPart = (CommitPart)CommitPart.decode(null, bbDecode);
959 processEntry(commitPart);
963 updateLiveStateFromLocal();
968 private Pair<Boolean, Boolean> sendTransactionToLocal(Transaction transaction) {
970 // Get the devices local communications
971 Pair<String, Integer> localCommunicationInformation = localCommunicationTable.get(transaction.getArbitrator());
973 if (localCommunicationInformation == null) {
974 // Cant talk to that device locally so do nothing
975 return new Pair<Boolean, Boolean>(true, false);
978 // Get the size of the send data
979 int sendDataSize = Integer.BYTES + Long.BYTES;
980 for (TransactionPart part : transaction.getParts().values()) {
981 sendDataSize += part.getSize();
984 Long lastArbitrationDataLocalSequenceNumber = (long) - 1;
985 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(transaction.getArbitrator()) != null) {
986 lastArbitrationDataLocalSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(transaction.getArbitrator());
989 // Make the send data size
990 byte[] sendData = new byte[sendDataSize];
991 ByteBuffer bbEncode = ByteBuffer.wrap(sendData);
994 bbEncode.putLong(lastArbitrationDataLocalSequenceNumber);
995 bbEncode.putInt(transaction.getParts().size());
996 for (TransactionPart part : transaction.getParts().values()) {
997 part.encode(bbEncode);
1002 byte[] returnData = cloud.sendLocalData(sendData, localSequenceNumber, localCommunicationInformation.getFirst(), localCommunicationInformation.getSecond());
1003 localSequenceNumber++;
1005 if (returnData == null) {
1006 // Could not contact server
1007 return new Pair<Boolean, Boolean>(true, false);
1011 ByteBuffer bbDecode = ByteBuffer.wrap(returnData);
1012 boolean didCommit = bbDecode.get() == 1;
1013 boolean couldArbitrate = bbDecode.get() == 1;
1014 int numberOfEntries = bbDecode.getInt();
1015 boolean foundAbort = false;
1017 for (int i = 0; i < numberOfEntries; i++) {
1018 byte type = bbDecode.get();
1019 if (type == Entry.TypeAbort) {
1020 Abort abort = (Abort)Abort.decode(null, bbDecode);
1022 if ((abort.getTransactionMachineId() == localMachineId) && (abort.getTransactionClientLocalSequenceNumber() == transaction.getClientLocalSequenceNumber())) {
1026 processEntry(abort);
1027 } else if (type == Entry.TypeCommitPart) {
1028 CommitPart commitPart = (CommitPart)CommitPart.decode(null, bbDecode);
1029 processEntry(commitPart);
1033 updateLiveStateFromLocal();
1035 if (couldArbitrate) {
1036 TransactionStatus status = transaction.getTransactionStatus();
1038 status.setStatus(TransactionStatus.StatusCommitted);
1040 status.setStatus(TransactionStatus.StatusAborted);
1043 TransactionStatus status = transaction.getTransactionStatus();
1045 status.setStatus(TransactionStatus.StatusAborted);
1047 status.setStatus(TransactionStatus.StatusCommitted);
1051 return new Pair<Boolean, Boolean>(false, true);
1054 public synchronized byte[] acceptDataFromLocal(byte[] data) {
1057 ByteBuffer bbDecode = ByteBuffer.wrap(data);
1058 long lastArbitratedSequenceNumberSeen = bbDecode.getLong();
1059 int numberOfParts = bbDecode.getInt();
1061 // If we did commit a transaction or not
1062 boolean didCommit = false;
1063 boolean couldArbitrate = false;
1065 if (numberOfParts != 0) {
1067 // decode the transaction
1068 Transaction transaction = new Transaction();
1069 for (int i = 0; i < numberOfParts; i++) {
1071 TransactionPart newPart = (TransactionPart)TransactionPart.decode(null, bbDecode);
1072 transaction.addPartDecode(newPart);
1075 // Arbitrate on transaction and pull relevant return data
1076 Pair<Boolean, Boolean> localArbitrateReturn = arbitrateOnLocalTransaction(transaction);
1077 couldArbitrate = localArbitrateReturn.getFirst();
1078 didCommit = localArbitrateReturn.getSecond();
1080 updateLiveStateFromLocal();
1082 // Transaction was sent to the server so keep track of it to prevent double commit
1083 if (transaction.getSequenceNumber() != -1) {
1084 offlineTransactionsCommittedAndAtServer.add(transaction.getId());
1088 // The data to send back
1089 int returnDataSize = 0;
1090 List<Entry> unseenArbitrations = new ArrayList<Entry>();
1092 // Get the aborts to send back
1093 List<Long> abortLocalSequenceNumbers = new ArrayList<Long >(liveAbortsGeneratedByLocal.keySet());
1094 Collections.sort(abortLocalSequenceNumbers);
1095 for (Long localSequenceNumber : abortLocalSequenceNumbers) {
1096 if (localSequenceNumber <= lastArbitratedSequenceNumberSeen) {
1100 Abort abort = liveAbortsGeneratedByLocal.get(localSequenceNumber);
1101 unseenArbitrations.add(abort);
1102 returnDataSize += abort.getSize();
1105 // Get the commits to send back
1106 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(localMachineId);
1107 if (commitForClientTable != null) {
1108 List<Long> commitLocalSequenceNumbers = new ArrayList<Long>(commitForClientTable.keySet());
1109 Collections.sort(commitLocalSequenceNumbers);
1111 for (Long localSequenceNumber : commitLocalSequenceNumbers) {
1112 Commit commit = commitForClientTable.get(localSequenceNumber);
1114 if (localSequenceNumber <= lastArbitratedSequenceNumberSeen) {
1118 unseenArbitrations.addAll(commit.getParts().values());
1120 for (CommitPart commitPart : commit.getParts().values()) {
1121 returnDataSize += commitPart.getSize();
1126 // Number of arbitration entries to decode
1127 returnDataSize += 2 * Integer.BYTES;
1129 // Boolean of did commit or not
1130 if (numberOfParts != 0) {
1131 returnDataSize += Byte.BYTES;
1134 // Data to send Back
1135 byte[] returnData = new byte[returnDataSize];
1136 ByteBuffer bbEncode = ByteBuffer.wrap(returnData);
1138 if (numberOfParts != 0) {
1140 bbEncode.put((byte)1);
1142 bbEncode.put((byte)0);
1144 if (couldArbitrate) {
1145 bbEncode.put((byte)1);
1147 bbEncode.put((byte)0);
1151 bbEncode.putInt(unseenArbitrations.size());
1152 for (Entry entry : unseenArbitrations) {
1153 entry.encode(bbEncode);
1157 localSequenceNumber++;
1161 private ThreeTuple<Boolean, Boolean, Slot[]> sendSlotsToServer(Slot slot, int newSize, boolean isNewKey) throws ServerException {
1163 boolean attemptedToSendToServerTmp = attemptedToSendToServer;
1164 attemptedToSendToServer = true;
1166 boolean inserted = false;
1167 boolean lastTryInserted = false;
1169 Slot[] array = cloud.putSlot(slot, newSize);
1170 if (array == null) {
1171 array = new Slot[] {slot};
1172 rejectedSlotList.clear();
1175 if (array.length == 0) {
1176 throw new Error("Server Error: Did not send any slots");
1179 // if (attemptedToSendToServerTmp) {
1180 if (hadPartialSendToServer) {
1182 boolean isInserted = false;
1183 for (Slot s : array) {
1184 if ((s.getSequenceNumber() == slot.getSequenceNumber()) && (s.getMachineID() == localMachineId)) {
1190 for (Slot s : array) {
1195 // Process each entry in the slot
1196 for (Entry entry : s.getEntries()) {
1198 if (entry.getType() == Entry.TypeLastMessage) {
1199 LastMessage lastMessage = (LastMessage)entry;
1201 if ((lastMessage.getMachineID() == localMachineId) && (lastMessage.getSequenceNumber() == slot.getSequenceNumber())) {
1210 rejectedSlotList.add(slot.getSequenceNumber());
1211 lastTryInserted = false;
1213 lastTryInserted = true;
1216 rejectedSlotList.add(slot.getSequenceNumber());
1217 lastTryInserted = false;
1221 return new ThreeTuple<Boolean, Boolean, Slot[]>(inserted, lastTryInserted, array);
1225 * Returns false if a resize was needed
1227 private ThreeTuple<Boolean, Integer, Boolean> fillSlot(Slot slot, boolean resize, NewKey newKeyEntry) {
1231 if (liveSlotCount > bufferResizeThreshold) {
1232 resize = true; //Resize is forced
1237 newSize = (int) (numberOfSlots * RESIZE_MULTIPLE);
1238 TableStatus status = new TableStatus(slot, newSize);
1239 slot.addEntry(status);
1242 // Fill with rejected slots first before doing anything else
1243 doRejectedMessages(slot);
1245 // Do mandatory rescue of entries
1246 ThreeTuple<Boolean, Boolean, Long> mandatoryRescueReturn = doMandatoryResuce(slot, resize);
1248 // Extract working variables
1249 boolean needsResize = mandatoryRescueReturn.getFirst();
1250 boolean seenLiveSlot = mandatoryRescueReturn.getSecond();
1251 long currentRescueSequenceNumber = mandatoryRescueReturn.getThird();
1253 if (needsResize && !resize) {
1254 // We need to resize but we are not resizing so return false
1255 return new ThreeTuple<Boolean, Integer, Boolean>(true, null, null);
1258 boolean inserted = false;
1259 if (newKeyEntry != null) {
1260 newKeyEntry.setSlot(slot);
1261 if (slot.hasSpace(newKeyEntry)) {
1263 slot.addEntry(newKeyEntry);
1268 // Clear the transactions, aborts and commits that were sent previously
1269 transactionPartsSent.clear();
1270 pendingSendArbitrationEntriesToDelete.clear();
1272 for (ArbitrationRound round : pendingSendArbitrationRounds) {
1273 boolean isFull = false;
1274 round.generateParts();
1275 List<Entry> parts = round.getParts();
1277 // Insert pending arbitration data
1278 for (Entry arbitrationData : parts) {
1280 // If it is an abort then we need to set some information
1281 if (arbitrationData instanceof Abort) {
1282 ((Abort)arbitrationData).setSequenceNumber(slot.getSequenceNumber());
1285 if (!slot.hasSpace(arbitrationData)) {
1286 // No space so cant do anything else with these data entries
1291 // Add to this current slot and add it to entries to delete
1292 slot.addEntry(arbitrationData);
1293 pendingSendArbitrationEntriesToDelete.add(arbitrationData);
1301 if (pendingTransactionQueue.size() > 0) {
1303 Transaction transaction = pendingTransactionQueue.get(0);
1305 // Set the transaction sequence number if it has yet to be inserted into the block chain
1306 // if ((!transaction.didSendAPartToServer() && !transaction.getServerFailure()) || (transaction.getSequenceNumber() == -1)) {
1307 // transaction.setSequenceNumber(slot.getSequenceNumber());
1310 if ((!transaction.didSendAPartToServer()) || (transaction.getSequenceNumber() == -1)) {
1311 transaction.setSequenceNumber(slot.getSequenceNumber());
1316 TransactionPart part = transaction.getNextPartToSend();
1319 // Ran out of parts to send for this transaction so move on
1323 if (slot.hasSpace(part)) {
1324 slot.addEntry(part);
1325 List<Integer> partsSent = transactionPartsSent.get(transaction);
1326 if (partsSent == null) {
1327 partsSent = new ArrayList<Integer>();
1328 transactionPartsSent.put(transaction, partsSent);
1330 partsSent.add(part.getPartNumber());
1331 transactionPartsSent.put(transaction, partsSent);
1338 // Fill the remainder of the slot with rescue data
1339 doOptionalRescue(slot, seenLiveSlot, currentRescueSequenceNumber, resize);
1341 return new ThreeTuple<Boolean, Integer, Boolean>(false, newSize, inserted);
1344 private void doRejectedMessages(Slot s) {
1345 if (! rejectedSlotList.isEmpty()) {
1346 /* TODO: We should avoid generating a rejected message entry if
1347 * there is already a sufficient entry in the queue (e.g.,
1348 * equalsto value of true and same sequence number). */
1350 long old_seqn = rejectedSlotList.firstElement();
1351 if (rejectedSlotList.size() > REJECTED_THRESHOLD) {
1352 long new_seqn = rejectedSlotList.lastElement();
1353 RejectedMessage rm = new RejectedMessage(s, s.getSequenceNumber(), localMachineId, old_seqn, new_seqn, false);
1356 long prev_seqn = -1;
1358 /* Go through list of missing messages */
1359 for (; i < rejectedSlotList.size(); i++) {
1360 long curr_seqn = rejectedSlotList.get(i);
1361 Slot s_msg = buffer.getSlot(curr_seqn);
1364 prev_seqn = curr_seqn;
1366 /* Generate rejected message entry for missing messages */
1367 if (prev_seqn != -1) {
1368 RejectedMessage rm = new RejectedMessage(s, s.getSequenceNumber(), localMachineId, old_seqn, prev_seqn, false);
1371 /* Generate rejected message entries for present messages */
1372 for (; i < rejectedSlotList.size(); i++) {
1373 long curr_seqn = rejectedSlotList.get(i);
1374 Slot s_msg = buffer.getSlot(curr_seqn);
1375 long machineid = s_msg.getMachineID();
1376 RejectedMessage rm = new RejectedMessage(s, s.getSequenceNumber(), machineid, curr_seqn, curr_seqn, true);
1383 private ThreeTuple<Boolean, Boolean, Long> doMandatoryResuce(Slot slot, boolean resize) {
1384 long newestSequenceNumber = buffer.getNewestSeqNum();
1385 long oldestSequenceNumber = buffer.getOldestSeqNum();
1386 if (oldestLiveSlotSequenceNumver < oldestSequenceNumber) {
1387 oldestLiveSlotSequenceNumver = oldestSequenceNumber;
1390 long currentSequenceNumber = oldestLiveSlotSequenceNumver;
1391 boolean seenLiveSlot = false;
1392 long firstIfFull = newestSequenceNumber + 1 - numberOfSlots; // smallest seq number in the buffer if it is full
1393 long threshold = firstIfFull + FREE_SLOTS; // we want the buffer to be clear of live entries up to this point
1397 for (; currentSequenceNumber < threshold; currentSequenceNumber++) {
1398 Slot previousSlot = buffer.getSlot(currentSequenceNumber);
1399 // Push slot number forward
1400 if (! seenLiveSlot) {
1401 oldestLiveSlotSequenceNumver = currentSequenceNumber;
1404 if (!previousSlot.isLive()) {
1408 // We have seen a live slot
1409 seenLiveSlot = true;
1411 // Get all the live entries for a slot
1412 Vector<Entry> liveEntries = previousSlot.getLiveEntries(resize);
1414 // Iterate over all the live entries and try to rescue them
1415 for (Entry liveEntry : liveEntries) {
1416 if (slot.hasSpace(liveEntry)) {
1418 // Enough space to rescue the entry
1419 slot.addEntry(liveEntry);
1420 } else if (currentSequenceNumber == firstIfFull) {
1421 //if there's no space but the entry is about to fall off the queue
1422 System.out.println("B"); //?
1423 return new ThreeTuple<Boolean, Boolean, Long>(true, seenLiveSlot, currentSequenceNumber);
1430 return new ThreeTuple<Boolean, Boolean, Long>(false, seenLiveSlot, currentSequenceNumber);
1433 private void doOptionalRescue(Slot s, boolean seenliveslot, long seqn, boolean resize) {
1434 /* now go through live entries from least to greatest sequence number until
1435 * either all live slots added, or the slot doesn't have enough room
1436 * for SKIP_THRESHOLD consecutive entries*/
1438 long newestseqnum = buffer.getNewestSeqNum();
1440 for (; seqn <= newestseqnum; seqn++) {
1441 Slot prevslot = buffer.getSlot(seqn);
1442 //Push slot number forward
1444 oldestLiveSlotSequenceNumver = seqn;
1446 if (!prevslot.isLive())
1448 seenliveslot = true;
1449 Vector<Entry> liveentries = prevslot.getLiveEntries(resize);
1450 for (Entry liveentry : liveentries) {
1451 if (s.hasSpace(liveentry))
1452 s.addEntry(liveentry);
1455 if (skipcount > SKIP_THRESHOLD)
1463 * Checks for malicious activity and updates the local copy of the block chain.
1465 private void validateAndUpdate(Slot[] newSlots, boolean acceptUpdatesToLocal) {
1467 // The cloud communication layer has checked slot HMACs already before decoding
1468 if (newSlots.length == 0) {
1472 // Make sure all slots are newer than the last largest slot this client has seen
1473 long firstSeqNum = newSlots[0].getSequenceNumber();
1474 if (firstSeqNum <= sequenceNumber) {
1475 throw new Error("Server Error: Sent older slots!");
1478 // Create an object that can access both new slots and slots in our local chain
1479 // without committing slots to our local chain
1480 SlotIndexer indexer = new SlotIndexer(newSlots, buffer);
1482 // Check that the HMAC chain is not broken
1483 checkHMACChain(indexer, newSlots);
1485 // Set to keep track of messages from clients
1486 HashSet<Long> machineSet = new HashSet<Long>(lastMessageTable.keySet());
1488 // Process each slots data
1489 for (Slot slot : newSlots) {
1490 processSlot(indexer, slot, acceptUpdatesToLocal, machineSet);
1492 updateExpectedSize();
1495 // If there is a gap, check to see if the server sent us everything.
1496 if (firstSeqNum != (sequenceNumber + 1)) {
1498 // Check the size of the slots that were sent down by the server.
1499 // Can only check the size if there was a gap
1500 checkNumSlots(newSlots.length);
1502 // Since there was a gap every machine must have pushed a slot or must have
1503 // a last message message. If not then the server is hiding slots
1504 if (!machineSet.isEmpty()) {
1505 throw new Error("Missing record for machines: " + machineSet);
1509 // Update the size of our local block chain.
1512 // Commit new to slots to the local block chain.
1513 for (Slot slot : newSlots) {
1515 // Insert this slot into our local block chain copy.
1516 buffer.putSlot(slot);
1518 // Keep track of how many slots are currently live (have live data in them).
1522 // Get the sequence number of the latest slot in the system
1523 sequenceNumber = newSlots[newSlots.length - 1].getSequenceNumber();
1525 updateLiveStateFromServer();
1527 // No Need to remember after we pulled from the server
1528 offlineTransactionsCommittedAndAtServer.clear();
1530 // This is invalidated now
1531 hadPartialSendToServer = false;
1534 private void updateLiveStateFromServer() {
1535 // Process the new transaction parts
1536 processNewTransactionParts();
1538 // Do arbitration on new transactions that were received
1539 arbitrateFromServer();
1541 // Update all the committed keys
1542 boolean didCommitOrSpeculate = updateCommittedTable();
1544 // Delete the transactions that are now dead
1545 updateLiveTransactionsAndStatus();
1548 didCommitOrSpeculate |= updateSpeculativeTable(didCommitOrSpeculate);
1549 updatePendingTransactionSpeculativeTable(didCommitOrSpeculate);
1552 private void updateLiveStateFromLocal() {
1553 // Update all the committed keys
1554 boolean didCommitOrSpeculate = updateCommittedTable();
1556 // Delete the transactions that are now dead
1557 updateLiveTransactionsAndStatus();
1560 didCommitOrSpeculate |= updateSpeculativeTable(didCommitOrSpeculate);
1561 updatePendingTransactionSpeculativeTable(didCommitOrSpeculate);
1564 private void initExpectedSize(long firstSequenceNumber, long numberOfSlots) {
1565 // if (didFindTableStatus) {
1568 long prevslots = firstSequenceNumber;
1571 if (didFindTableStatus) {
1572 // expectedsize = (prevslots < ((long) numberOfSlots)) ? (int) prevslots : expectedsize;
1573 // System.out.println("Here2: " + expectedsize + " " + numberOfSlots + " " + prevslots);
1576 expectedsize = (prevslots < ((long) numberOfSlots)) ? (int) prevslots : numberOfSlots;
1577 // System.out.println("Here: " + expectedsize);
1580 // System.out.println(numberOfSlots);
1582 didFindTableStatus = true;
1583 currMaxSize = numberOfSlots;
1586 private void updateExpectedSize() {
1589 if (expectedsize > currMaxSize) {
1590 expectedsize = currMaxSize;
1596 * Check the size of the block chain to make sure there are enough slots sent back by the server.
1597 * This is only called when we have a gap between the slots that we have locally and the slots
1598 * sent by the server therefore in the slots sent by the server there will be at least 1 Table
1601 private void checkNumSlots(int numberOfSlots) {
1602 if (numberOfSlots != expectedsize) {
1603 throw new Error("Server Error: Server did not send all slots. Expected: " + expectedsize + " Received:" + numberOfSlots);
1607 private void updateCurrMaxSize(int newmaxsize) {
1608 currMaxSize = newmaxsize;
1613 * Update the size of of the local buffer if it is needed.
1615 private void commitNewMaxSize() {
1616 didFindTableStatus = false;
1618 // Resize the local slot buffer
1619 if (numberOfSlots != currMaxSize) {
1620 buffer.resize((int)currMaxSize);
1623 // Change the number of local slots to the new size
1624 numberOfSlots = (int)currMaxSize;
1627 // Recalculate the resize threshold since the size of the local buffer has changed
1628 setResizeThreshold();
1632 * Process the new transaction parts from this latest round of slots received from the server
1634 private void processNewTransactionParts() {
1636 if (newTransactionParts.size() == 0) {
1637 // Nothing new to process
1641 // Iterate through all the machine Ids that we received new parts for
1642 for (Long machineId : newTransactionParts.keySet()) {
1643 Map<Pair<Long, Integer>, TransactionPart> parts = newTransactionParts.get(machineId);
1645 // Iterate through all the parts for that machine Id
1646 for (Pair<Long, Integer> partId : parts.keySet()) {
1647 TransactionPart part = parts.get(partId);
1649 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(part.getArbitratorId());
1650 if ((lastTransactionNumber != null) && (lastTransactionNumber >= part.getSequenceNumber())) {
1651 // Set dead the transaction part
1656 // Get the transaction object for that sequence number
1657 Transaction transaction = liveTransactionBySequenceNumberTable.get(part.getSequenceNumber());
1659 if (transaction == null) {
1660 // This is a new transaction that we dont have so make a new one
1661 transaction = new Transaction();
1663 // Insert this new transaction into the live tables
1664 liveTransactionBySequenceNumberTable.put(part.getSequenceNumber(), transaction);
1665 liveTransactionByTransactionIdTable.put(part.getTransactionId(), transaction);
1668 // Add that part to the transaction
1669 transaction.addPartDecode(part);
1673 // Clear all the new transaction parts in preparation for the next time the server sends slots
1674 newTransactionParts.clear();
1678 private long lastSeqNumArbOn = 0;
1680 private void arbitrateFromServer() {
1682 if (liveTransactionBySequenceNumberTable.size() == 0) {
1683 // Nothing to arbitrate on so move on
1687 // Get the transaction sequence numbers and sort from oldest to newest
1688 List<Long> transactionSequenceNumbers = new ArrayList<Long>(liveTransactionBySequenceNumberTable.keySet());
1689 Collections.sort(transactionSequenceNumbers);
1691 // Collection of key value pairs that are
1692 Map<IoTString, KeyValue> speculativeTableTmp = new HashMap<IoTString, KeyValue>();
1694 // The last transaction arbitrated on
1695 long lastTransactionCommitted = -1;
1696 Set<Abort> generatedAborts = new HashSet<Abort>();
1698 for (Long transactionSequenceNumber : transactionSequenceNumbers) {
1699 Transaction transaction = liveTransactionBySequenceNumberTable.get(transactionSequenceNumber);
1703 // Check if this machine arbitrates for this transaction if not then we cant arbitrate this transaction
1704 if (transaction.getArbitrator() != localMachineId) {
1708 if (transactionSequenceNumber < lastSeqNumArbOn) {
1712 if (offlineTransactionsCommittedAndAtServer.contains(transaction.getId())) {
1713 // We have seen this already locally so dont commit again
1718 if (!transaction.isComplete()) {
1719 // Will arbitrate in incorrect order if we continue so just break
1725 // update the largest transaction seen by arbitrator from server
1726 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) == null) {
1727 lastTransactionSeenFromMachineFromServer.put(transaction.getMachineId(), transaction.getClientLocalSequenceNumber());
1729 Long lastTransactionSeenFromMachine = lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId());
1730 if (transaction.getClientLocalSequenceNumber() > lastTransactionSeenFromMachine) {
1731 lastTransactionSeenFromMachineFromServer.put(transaction.getMachineId(), transaction.getClientLocalSequenceNumber());
1735 if (transaction.evaluateGuard(committedKeyValueTable, speculativeTableTmp, null)) {
1736 // Guard evaluated as true
1738 // Update the local changes so we can make the commit
1739 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1740 speculativeTableTmp.put(kv.getKey(), kv);
1743 // Update what the last transaction committed was for use in batch commit
1744 lastTransactionCommitted = transactionSequenceNumber;
1746 // Guard evaluated was false so create abort
1749 Abort newAbort = new Abort(null,
1750 transaction.getClientLocalSequenceNumber(),
1751 transaction.getSequenceNumber(),
1752 transaction.getMachineId(),
1753 transaction.getArbitrator(),
1754 localArbitrationSequenceNumber);
1755 localArbitrationSequenceNumber++;
1757 generatedAborts.add(newAbort);
1759 // Insert the abort so we can process
1760 processEntry(newAbort);
1763 lastSeqNumArbOn = transactionSequenceNumber;
1765 // liveTransactionBySequenceNumberTable.remove(transactionSequenceNumber);
1768 Commit newCommit = null;
1770 // If there is something to commit
1771 if (speculativeTableTmp.size() != 0) {
1773 // Create the commit and increment the commit sequence number
1774 newCommit = new Commit(localArbitrationSequenceNumber, localMachineId, lastTransactionCommitted);
1775 localArbitrationSequenceNumber++;
1777 // Add all the new keys to the commit
1778 for (KeyValue kv : speculativeTableTmp.values()) {
1779 newCommit.addKV(kv);
1782 // create the commit parts
1783 newCommit.createCommitParts();
1785 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1787 // Insert the commit so we can process it
1788 for (CommitPart commitPart : newCommit.getParts().values()) {
1789 processEntry(commitPart);
1793 if ((newCommit != null) || (generatedAborts.size() > 0)) {
1794 ArbitrationRound arbitrationRound = new ArbitrationRound(newCommit, generatedAborts);
1795 pendingSendArbitrationRounds.add(arbitrationRound);
1797 if (compactArbitrationData()) {
1798 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1799 if (newArbitrationRound.getCommit() != null) {
1800 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1801 processEntry(commitPart);
1808 private Pair<Boolean, Boolean> arbitrateOnLocalTransaction(Transaction transaction) {
1810 // Check if this machine arbitrates for this transaction if not then we cant arbitrate this transaction
1811 if (transaction.getArbitrator() != localMachineId) {
1812 return new Pair<Boolean, Boolean>(false, false);
1815 if (!transaction.isComplete()) {
1816 // Will arbitrate in incorrect order if we continue so just break
1818 return new Pair<Boolean, Boolean>(false, false);
1821 if (transaction.getMachineId() != localMachineId) {
1822 // dont do this check for local transactions
1823 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) != null) {
1824 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) > transaction.getClientLocalSequenceNumber()) {
1825 // We've have already seen this from the server
1826 return new Pair<Boolean, Boolean>(false, false);
1831 if (transaction.evaluateGuard(committedKeyValueTable, null, null)) {
1832 // Guard evaluated as true
1834 // Create the commit and increment the commit sequence number
1835 Commit newCommit = new Commit(localArbitrationSequenceNumber, localMachineId, -1);
1836 localArbitrationSequenceNumber++;
1838 // Update the local changes so we can make the commit
1839 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1840 newCommit.addKV(kv);
1843 // create the commit parts
1844 newCommit.createCommitParts();
1846 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1847 ArbitrationRound arbitrationRound = new ArbitrationRound(newCommit, new HashSet<Abort>());
1848 pendingSendArbitrationRounds.add(arbitrationRound);
1850 if (compactArbitrationData()) {
1851 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1852 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1853 processEntry(commitPart);
1856 // Insert the commit so we can process it
1857 for (CommitPart commitPart : newCommit.getParts().values()) {
1858 processEntry(commitPart);
1862 if (transaction.getMachineId() == localMachineId) {
1863 TransactionStatus status = transaction.getTransactionStatus();
1864 if (status != null) {
1865 status.setStatus(TransactionStatus.StatusCommitted);
1869 updateLiveStateFromLocal();
1870 return new Pair<Boolean, Boolean>(true, true);
1873 if (transaction.getMachineId() == localMachineId) {
1874 // For locally created messages update the status
1876 // Guard evaluated was false so create abort
1877 TransactionStatus status = transaction.getTransactionStatus();
1878 if (status != null) {
1879 status.setStatus(TransactionStatus.StatusAborted);
1882 Set addAbortSet = new HashSet<Abort>();
1886 Abort newAbort = new Abort(null,
1887 transaction.getClientLocalSequenceNumber(),
1889 transaction.getMachineId(),
1890 transaction.getArbitrator(),
1891 localArbitrationSequenceNumber);
1892 localArbitrationSequenceNumber++;
1894 addAbortSet.add(newAbort);
1897 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1898 ArbitrationRound arbitrationRound = new ArbitrationRound(null, addAbortSet);
1899 pendingSendArbitrationRounds.add(arbitrationRound);
1901 if (compactArbitrationData()) {
1902 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1903 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1904 processEntry(commitPart);
1909 updateLiveStateFromLocal();
1910 return new Pair<Boolean, Boolean>(true, false);
1915 * Compacts the arbitration data my merging commits and aggregating aborts so that a single large push of commits can be done instead of many small updates
1917 private boolean compactArbitrationData() {
1919 if (pendingSendArbitrationRounds.size() < 2) {
1920 // Nothing to compact so do nothing
1924 ArbitrationRound lastRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1925 if (lastRound.didSendPart()) {
1929 boolean hadCommit = (lastRound.getCommit() == null);
1930 boolean gotNewCommit = false;
1932 int numberToDelete = 1;
1933 while (numberToDelete < pendingSendArbitrationRounds.size()) {
1934 ArbitrationRound round = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - numberToDelete - 1);
1936 if (round.isFull() || round.didSendPart()) {
1937 // Stop since there is a part that cannot be compacted and we need to compact in order
1941 if (round.getCommit() == null) {
1943 // Try compacting aborts only
1944 int newSize = round.getCurrentSize() + lastRound.getAbortsCount();
1945 if (newSize > ArbitrationRound.MAX_PARTS) {
1946 // Cant compact since it would be too large
1949 lastRound.addAborts(round.getAborts());
1952 // Create a new larger commit
1953 Commit newCommit = Commit.merge(lastRound.getCommit(), round.getCommit(), localArbitrationSequenceNumber);
1954 localArbitrationSequenceNumber++;
1956 // Create the commit parts so that we can count them
1957 newCommit.createCommitParts();
1959 // Calculate the new size of the parts
1960 int newSize = newCommit.getNumberOfParts();
1961 newSize += lastRound.getAbortsCount();
1962 newSize += round.getAbortsCount();
1964 if (newSize > ArbitrationRound.MAX_PARTS) {
1965 // Cant compact since it would be too large
1969 // Set the new compacted part
1970 lastRound.setCommit(newCommit);
1971 lastRound.addAborts(round.getAborts());
1972 gotNewCommit = true;
1978 if (numberToDelete != 1) {
1979 // If there is a compaction
1981 // Delete the previous pieces that are now in the new compacted piece
1982 if (numberToDelete == pendingSendArbitrationRounds.size()) {
1983 pendingSendArbitrationRounds.clear();
1985 for (int i = 0; i < numberToDelete; i++) {
1986 pendingSendArbitrationRounds.remove(pendingSendArbitrationRounds.size() - 1);
1990 // Add the new compacted into the pending to send list
1991 pendingSendArbitrationRounds.add(lastRound);
1993 // Should reinsert into the commit processor
1994 if (hadCommit && gotNewCommit) {
2001 // private boolean compactArbitrationData() {
2006 * Update all the commits and the committed tables, sets dead the dead transactions
2008 private boolean updateCommittedTable() {
2010 if (newCommitParts.size() == 0) {
2011 // Nothing new to process
2015 // Iterate through all the machine Ids that we received new parts for
2016 for (Long machineId : newCommitParts.keySet()) {
2017 Map<Pair<Long, Integer>, CommitPart> parts = newCommitParts.get(machineId);
2019 // Iterate through all the parts for that machine Id
2020 for (Pair<Long, Integer> partId : parts.keySet()) {
2021 CommitPart part = parts.get(partId);
2023 // Get the transaction object for that sequence number
2024 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(part.getMachineId());
2026 if (commitForClientTable == null) {
2027 // This is the first commit from this device
2028 commitForClientTable = new HashMap<Long, Commit>();
2029 liveCommitsTable.put(part.getMachineId(), commitForClientTable);
2032 Commit commit = commitForClientTable.get(part.getSequenceNumber());
2034 if (commit == null) {
2035 // This is a new commit that we dont have so make a new one
2036 commit = new Commit();
2038 // Insert this new commit into the live tables
2039 commitForClientTable.put(part.getSequenceNumber(), commit);
2042 // Add that part to the commit
2043 commit.addPartDecode(part);
2047 // Clear all the new commits parts in preparation for the next time the server sends slots
2048 newCommitParts.clear();
2050 // If we process a new commit keep track of it for future use
2051 boolean didProcessANewCommit = false;
2053 // Process the commits one by one
2054 for (Long arbitratorId : liveCommitsTable.keySet()) {
2056 // Get all the commits for a specific arbitrator
2057 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(arbitratorId);
2059 // Sort the commits in order
2060 List<Long> commitSequenceNumbers = new ArrayList<Long>(commitForClientTable.keySet());
2061 Collections.sort(commitSequenceNumbers);
2063 // Get the last commit seen from this arbitrator
2064 long lastCommitSeenSequenceNumber = -1;
2065 if (lastCommitSeenSequenceNumberByArbitratorTable.get(arbitratorId) != null) {
2066 lastCommitSeenSequenceNumber = lastCommitSeenSequenceNumberByArbitratorTable.get(arbitratorId);
2069 // Go through each new commit one by one
2070 for (int i = 0; i < commitSequenceNumbers.size(); i++) {
2071 Long commitSequenceNumber = commitSequenceNumbers.get(i);
2072 Commit commit = commitForClientTable.get(commitSequenceNumber);
2074 // Special processing if a commit is not complete
2075 if (!commit.isComplete()) {
2076 if (i == (commitSequenceNumbers.size() - 1)) {
2077 // If there is an incomplete commit and this commit is the latest one seen then this commit cannot be processed and there are no other commits
2080 // This is a commit that was already dead but parts of it are still in the block chain (not flushed out yet).
2081 // Delete it and move on
2083 commitForClientTable.remove(commit.getSequenceNumber());
2088 // Update the last transaction that was updated if we can
2089 if (commit.getTransactionSequenceNumber() != -1) {
2090 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(commit.getMachineId());
2092 // Update the last transaction sequence number that the arbitrator arbitrated on
2093 if ((lastTransactionNumber == null) || (lastTransactionNumber < commit.getTransactionSequenceNumber())) {
2094 lastArbitratedTransactionNumberByArbitratorTable.put(commit.getMachineId(), commit.getTransactionSequenceNumber());
2098 // Update the last arbitration data that we have seen so far
2099 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(commit.getMachineId()) != null) {
2101 long lastArbitrationSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(commit.getMachineId());
2102 if (commit.getSequenceNumber() > lastArbitrationSequenceNumber) {
2104 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(commit.getMachineId(), commit.getSequenceNumber());
2107 // Never seen any data from this arbitrator so record the first one
2108 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(commit.getMachineId(), commit.getSequenceNumber());
2111 // We have already seen this commit before so need to do the full processing on this commit
2112 if (commit.getSequenceNumber() <= lastCommitSeenSequenceNumber) {
2114 // Update the last transaction that was updated if we can
2115 if (commit.getTransactionSequenceNumber() != -1) {
2116 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(commit.getMachineId());
2118 // Update the last transaction sequence number that the arbitrator arbitrated on
2119 if ((lastTransactionNumber == null) || (lastTransactionNumber < commit.getTransactionSequenceNumber())) {
2120 lastArbitratedTransactionNumberByArbitratorTable.put(commit.getMachineId(), commit.getTransactionSequenceNumber());
2127 // If we got here then this is a brand new commit and needs full processing
2129 // Get what commits should be edited, these are the commits that have live values for their keys
2130 Set<Commit> commitsToEdit = new HashSet<Commit>();
2131 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
2132 commitsToEdit.add(liveCommitsByKeyTable.get(kv.getKey()));
2134 commitsToEdit.remove(null); // remove null since it could be in this set
2136 // Update each previous commit that needs to be updated
2137 for (Commit previousCommit : commitsToEdit) {
2139 // Only bother with live commits (TODO: Maybe remove this check)
2140 if (previousCommit.isLive()) {
2142 // Update which keys in the old commits are still live
2143 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
2144 previousCommit.invalidateKey(kv.getKey());
2147 // if the commit is now dead then remove it
2148 if (!previousCommit.isLive()) {
2149 commitForClientTable.remove(previousCommit);
2154 // Update the last seen sequence number from this arbitrator
2155 if (lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId()) != null) {
2156 if (commit.getSequenceNumber() > lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId())) {
2157 lastCommitSeenSequenceNumberByArbitratorTable.put(commit.getMachineId(), commit.getSequenceNumber());
2160 lastCommitSeenSequenceNumberByArbitratorTable.put(commit.getMachineId(), commit.getSequenceNumber());
2163 // We processed a new commit that we havent seen before
2164 didProcessANewCommit = true;
2166 // Update the committed table of keys and which commit is using which key
2167 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
2168 committedKeyValueTable.put(kv.getKey(), kv);
2169 liveCommitsByKeyTable.put(kv.getKey(), commit);
2174 return didProcessANewCommit;
2178 * Create the speculative table from transactions that are still live and have come from the cloud
2180 private boolean updateSpeculativeTable(boolean didProcessNewCommits) {
2181 if (liveTransactionBySequenceNumberTable.keySet().size() == 0) {
2182 // There is nothing to speculate on
2186 // Create a list of the transaction sequence numbers and sort them from oldest to newest
2187 List<Long> transactionSequenceNumbersSorted = new ArrayList<Long>(liveTransactionBySequenceNumberTable.keySet());
2188 Collections.sort(transactionSequenceNumbersSorted);
2190 boolean hasGapInTransactionSequenceNumbers = transactionSequenceNumbersSorted.get(0) != oldestTransactionSequenceNumberSpeculatedOn;
2193 if (hasGapInTransactionSequenceNumbers || didProcessNewCommits) {
2194 // If there is a gap in the transaction sequence numbers then there was a commit or an abort of a transaction
2195 // OR there was a new commit (Could be from offline commit) so a redo the speculation from scratch
2197 // Start from scratch
2198 speculatedKeyValueTable.clear();
2199 lastTransactionSequenceNumberSpeculatedOn = -1;
2200 oldestTransactionSequenceNumberSpeculatedOn = -1;
2204 // Remember the front of the transaction list
2205 oldestTransactionSequenceNumberSpeculatedOn = transactionSequenceNumbersSorted.get(0);
2207 // Find where to start arbitration from
2208 int startIndex = transactionSequenceNumbersSorted.indexOf(lastTransactionSequenceNumberSpeculatedOn) + 1;
2210 if (startIndex >= transactionSequenceNumbersSorted.size()) {
2211 // Make sure we are not out of bounds
2212 return false; // did not speculate
2215 Set<Long> incompleteTransactionArbitrator = new HashSet<Long>();
2216 boolean didSkip = true;
2218 for (int i = startIndex; i < transactionSequenceNumbersSorted.size(); i++) {
2219 long transactionSequenceNumber = transactionSequenceNumbersSorted.get(i);
2220 Transaction transaction = liveTransactionBySequenceNumberTable.get(transactionSequenceNumber);
2222 if (!transaction.isComplete()) {
2223 // If there is an incomplete transaction then there is nothing we can do
2224 // add this transactions arbitrator to the list of arbitrators we should ignore
2225 incompleteTransactionArbitrator.add(transaction.getArbitrator());
2230 if (incompleteTransactionArbitrator.contains(transaction.getArbitrator())) {
2234 lastTransactionSequenceNumberSpeculatedOn = transactionSequenceNumber;
2236 if (transaction.evaluateGuard(committedKeyValueTable, speculatedKeyValueTable, null)) {
2237 // Guard evaluated to true so update the speculative table
2238 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
2239 speculatedKeyValueTable.put(kv.getKey(), kv);
2245 // Since there was a skip we need to redo the speculation next time around
2246 lastTransactionSequenceNumberSpeculatedOn = -1;
2247 oldestTransactionSequenceNumberSpeculatedOn = -1;
2250 // We did some speculation
2255 * Create the pending transaction speculative table from transactions that are still in the pending transaction buffer
2257 private void updatePendingTransactionSpeculativeTable(boolean didProcessNewCommitsOrSpeculate) {
2258 if (pendingTransactionQueue.size() == 0) {
2259 // There is nothing to speculate on
2264 if (didProcessNewCommitsOrSpeculate || (firstPendingTransaction != pendingTransactionQueue.get(0))) {
2265 // need to reset on the pending speculation
2266 lastPendingTransactionSpeculatedOn = null;
2267 firstPendingTransaction = pendingTransactionQueue.get(0);
2268 pendingTransactionSpeculatedKeyValueTable.clear();
2271 // Find where to start arbitration from
2272 int startIndex = pendingTransactionQueue.indexOf(firstPendingTransaction) + 1;
2274 if (startIndex >= pendingTransactionQueue.size()) {
2275 // Make sure we are not out of bounds
2279 for (int i = startIndex; i < pendingTransactionQueue.size(); i++) {
2280 Transaction transaction = pendingTransactionQueue.get(i);
2282 lastPendingTransactionSpeculatedOn = transaction;
2284 if (transaction.evaluateGuard(committedKeyValueTable, speculatedKeyValueTable, pendingTransactionSpeculatedKeyValueTable)) {
2285 // Guard evaluated to true so update the speculative table
2286 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
2287 pendingTransactionSpeculatedKeyValueTable.put(kv.getKey(), kv);
2294 * Set dead and remove from the live transaction tables the transactions that are dead
2296 private void updateLiveTransactionsAndStatus() {
2298 // Go through each of the transactions
2299 for (Iterator<Map.Entry<Long, Transaction>> iter = liveTransactionBySequenceNumberTable.entrySet().iterator(); iter.hasNext();) {
2300 Transaction transaction = iter.next().getValue();
2302 // Check if the transaction is dead
2303 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(transaction.getArbitrator());
2304 if ((lastTransactionNumber != null) && (lastTransactionNumber >= transaction.getSequenceNumber())) {
2306 // Set dead the transaction
2307 transaction.setDead();
2309 // Remove the transaction from the live table
2311 liveTransactionByTransactionIdTable.remove(transaction.getId());
2315 // Go through each of the transactions
2316 for (Iterator<Map.Entry<Long, TransactionStatus>> iter = outstandingTransactionStatus.entrySet().iterator(); iter.hasNext();) {
2317 TransactionStatus status = iter.next().getValue();
2319 // Check if the transaction is dead
2320 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(status.getTransactionArbitrator());
2321 if ((lastTransactionNumber != null) && (lastTransactionNumber >= status.getTransactionSequenceNumber())) {
2324 status.setStatus(TransactionStatus.StatusCommitted);
2333 * Process this slot, entry by entry. Also update the latest message sent by slot
2335 private void processSlot(SlotIndexer indexer, Slot slot, boolean acceptUpdatesToLocal, HashSet<Long> machineSet) {
2337 // Update the last message seen
2338 updateLastMessage(slot.getMachineID(), slot.getSequenceNumber(), slot, acceptUpdatesToLocal, machineSet);
2340 // Process each entry in the slot
2341 for (Entry entry : slot.getEntries()) {
2342 switch (entry.getType()) {
2344 case Entry.TypeCommitPart:
2345 processEntry((CommitPart)entry);
2348 case Entry.TypeAbort:
2349 processEntry((Abort)entry);
2352 case Entry.TypeTransactionPart:
2353 processEntry((TransactionPart)entry);
2356 case Entry.TypeNewKey:
2357 processEntry((NewKey)entry);
2360 case Entry.TypeLastMessage:
2361 processEntry((LastMessage)entry, machineSet);
2364 case Entry.TypeRejectedMessage:
2365 processEntry((RejectedMessage)entry, indexer);
2368 case Entry.TypeTableStatus:
2369 processEntry((TableStatus)entry, slot.getSequenceNumber());
2373 throw new Error("Unrecognized type: " + entry.getType());
2379 * Update the last message that was sent for a machine Id
2381 private void processEntry(LastMessage entry, HashSet<Long> machineSet) {
2382 // Update what the last message received by a machine was
2383 updateLastMessage(entry.getMachineID(), entry.getSequenceNumber(), entry, false, machineSet);
2387 * Add the new key to the arbitrators table and update the set of live new keys (in case of a rescued new key message)
2389 private void processEntry(NewKey entry) {
2391 // Update the arbitrator table with the new key information
2392 arbitratorTable.put(entry.getKey(), entry.getMachineID());
2394 // Update what the latest live new key is
2395 NewKey oldNewKey = liveNewKeyTable.put(entry.getKey(), entry);
2396 if (oldNewKey != null) {
2397 // Delete the old new key messages
2398 oldNewKey.setDead();
2403 * Process new table status entries and set dead the old ones as new ones come in.
2404 * keeps track of the largest and smallest table status seen in this current round
2405 * of updating the local copy of the block chain
2407 private void processEntry(TableStatus entry, long seq) {
2408 int newNumSlots = entry.getMaxSlots();
2409 updateCurrMaxSize(newNumSlots);
2411 initExpectedSize(seq, newNumSlots);
2413 if (liveTableStatus != null) {
2414 // We have a larger table status so the old table status is no longer alive
2415 liveTableStatus.setDead();
2418 // Make this new table status the latest alive table status
2419 liveTableStatus = entry;
2423 * Check old messages to see if there is a block chain violation. Also
2425 private void processEntry(RejectedMessage entry, SlotIndexer indexer) {
2426 long oldSeqNum = entry.getOldSeqNum();
2427 long newSeqNum = entry.getNewSeqNum();
2428 boolean isequal = entry.getEqual();
2429 long machineId = entry.getMachineID();
2430 long seq = entry.getSequenceNumber();
2433 // Check if we have messages that were supposed to be rejected in our local block chain
2434 for (long seqNum = oldSeqNum; seqNum <= newSeqNum; seqNum++) {
2437 Slot slot = indexer.getSlot(seqNum);
2440 // If we have this slot make sure that it was not supposed to be a rejected slot
2442 long slotMachineId = slot.getMachineID();
2443 if (isequal != (slotMachineId == machineId)) {
2444 throw new Error("Server Error: Trying to insert rejected message for slot " + seqNum);
2450 // Create a list of clients to watch until they see this rejected message entry.
2451 HashSet<Long> deviceWatchSet = new HashSet<Long>();
2452 for (Map.Entry<Long, Pair<Long, Liveness>> lastMessageEntry : lastMessageTable.entrySet()) {
2454 // Machine ID for the last message entry
2455 long lastMessageEntryMachineId = lastMessageEntry.getKey();
2457 // We've seen it, don't need to continue to watch. Our next
2458 // message will implicitly acknowledge it.
2459 if (lastMessageEntryMachineId == localMachineId) {
2463 Pair<Long, Liveness> lastMessageValue = lastMessageEntry.getValue();
2464 long entrySequenceNumber = lastMessageValue.getFirst();
2466 if (entrySequenceNumber < seq) {
2468 // Add this rejected message to the set of messages that this machine ID did not see yet
2469 addWatchList(lastMessageEntryMachineId, entry);
2471 // This client did not see this rejected message yet so add it to the watch set to monitor
2472 deviceWatchSet.add(lastMessageEntryMachineId);
2476 if (deviceWatchSet.isEmpty()) {
2477 // This rejected message has been seen by all the clients so
2480 // We need to watch this rejected message
2481 entry.setWatchSet(deviceWatchSet);
2486 * Check if this abort is live, if not then save it so we can kill it later.
2487 * update the last transaction number that was arbitrated on.
2489 private void processEntry(Abort entry) {
2492 if (entry.getTransactionSequenceNumber() != -1) {
2493 // update the transaction status if it was sent to the server
2494 TransactionStatus status = outstandingTransactionStatus.remove(entry.getTransactionSequenceNumber());
2495 if (status != null) {
2496 status.setStatus(TransactionStatus.StatusAborted);
2500 // Abort has not been seen by the client it is for yet so we need to keep track of it
2501 Abort previouslySeenAbort = liveAbortTable.put(entry.getAbortId(), entry);
2502 if (previouslySeenAbort != null) {
2503 previouslySeenAbort.setDead(); // Delete old version of the abort since we got a rescued newer version
2506 if (entry.getTransactionArbitrator() == localMachineId) {
2507 liveAbortsGeneratedByLocal.put(entry.getArbitratorLocalSequenceNumber(), entry);
2510 if ((entry.getSequenceNumber() != -1) && (lastMessageTable.get(entry.getTransactionMachineId()).getFirst() >= entry.getSequenceNumber())) {
2512 // The machine already saw this so it is dead
2514 liveAbortTable.remove(entry.getAbortId());
2516 if (entry.getTransactionArbitrator() == localMachineId) {
2517 liveAbortsGeneratedByLocal.remove(entry.getArbitratorLocalSequenceNumber());
2526 // Update the last arbitration data that we have seen so far
2527 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(entry.getTransactionArbitrator()) != null) {
2529 long lastArbitrationSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(entry.getTransactionArbitrator());
2530 if (entry.getSequenceNumber() > lastArbitrationSequenceNumber) {
2532 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(entry.getTransactionArbitrator(), entry.getSequenceNumber());
2535 // Never seen any data from this arbitrator so record the first one
2536 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(entry.getTransactionArbitrator(), entry.getSequenceNumber());
2540 // Set dead a transaction if we can
2541 Transaction transactionToSetDead = liveTransactionByTransactionIdTable.remove(new Pair<Long, Long>(entry.getTransactionMachineId(), entry.getTransactionClientLocalSequenceNumber()));
2542 if (transactionToSetDead != null) {
2543 liveTransactionBySequenceNumberTable.remove(transactionToSetDead.getSequenceNumber());
2546 // Update the last transaction sequence number that the arbitrator arbitrated on
2547 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(entry.getTransactionArbitrator());
2548 if ((lastTransactionNumber == null) || (lastTransactionNumber < entry.getTransactionSequenceNumber())) {
2551 if (entry.getTransactionSequenceNumber() != -1) {
2552 lastArbitratedTransactionNumberByArbitratorTable.put(entry.getTransactionArbitrator(), entry.getTransactionSequenceNumber());
2558 * Set dead the transaction part if that transaction is dead and keep track of all new parts
2560 private void processEntry(TransactionPart entry) {
2561 // Check if we have already seen this transaction and set it dead OR if it is not alive
2562 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(entry.getArbitratorId());
2563 if ((lastTransactionNumber != null) && (lastTransactionNumber >= entry.getSequenceNumber())) {
2564 // This transaction is dead, it was already committed or aborted
2569 // This part is still alive
2570 Map<Pair<Long, Integer>, TransactionPart> transactionPart = newTransactionParts.get(entry.getMachineId());
2572 if (transactionPart == null) {
2573 // Dont have a table for this machine Id yet so make one
2574 transactionPart = new HashMap<Pair<Long, Integer>, TransactionPart>();
2575 newTransactionParts.put(entry.getMachineId(), transactionPart);
2578 // Update the part and set dead ones we have already seen (got a rescued version)
2579 TransactionPart previouslySeenPart = transactionPart.put(entry.getPartId(), entry);
2580 if (previouslySeenPart != null) {
2581 previouslySeenPart.setDead();
2586 * Process new commit entries and save them for future use. Delete duplicates
2588 private void processEntry(CommitPart entry) {
2591 // Update the last transaction that was updated if we can
2592 if (entry.getTransactionSequenceNumber() != -1) {
2593 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(entry.getMachineId());
2595 // Update the last transaction sequence number that the arbitrator arbitrated on
2596 if ((lastTransactionNumber == null) || (lastTransactionNumber < entry.getTransactionSequenceNumber())) {
2597 lastArbitratedTransactionNumberByArbitratorTable.put(entry.getMachineId(), entry.getTransactionSequenceNumber());
2604 Map<Pair<Long, Integer>, CommitPart> commitPart = newCommitParts.get(entry.getMachineId());
2606 if (commitPart == null) {
2607 // Don't have a table for this machine Id yet so make one
2608 commitPart = new HashMap<Pair<Long, Integer>, CommitPart>();
2609 newCommitParts.put(entry.getMachineId(), commitPart);
2612 // Update the part and set dead ones we have already seen (got a rescued version)
2613 CommitPart previouslySeenPart = commitPart.put(entry.getPartId(), entry);
2614 if (previouslySeenPart != null) {
2615 previouslySeenPart.setDead();
2620 * Update the last message seen table. Update and set dead the appropriate RejectedMessages as clients see them.
2621 * Updates the live aborts, removes those that are dead and sets them dead.
2622 * Check that the last message seen is correct and that there is no mismatch of our own last message or that
2623 * other clients have not had a rollback on the last message.
2625 private void updateLastMessage(long machineId, long seqNum, Liveness liveness, boolean acceptUpdatesToLocal, HashSet<Long> machineSet) {
2627 // We have seen this machine ID
2628 machineSet.remove(machineId);
2630 // Get the set of rejected messages that this machine Id is has not seen yet
2631 HashSet<RejectedMessage> watchset = rejectedMessageWatchListTable.get(machineId);
2633 // If there is a rejected message that this machine Id has not seen yet
2634 if (watchset != null) {
2636 // Go through each rejected message that this machine Id has not seen yet
2637 for (Iterator<RejectedMessage> rmit = watchset.iterator(); rmit.hasNext(); ) {
2639 RejectedMessage rm = rmit.next();
2641 // If this machine Id has seen this rejected message...
2642 if (rm.getSequenceNumber() <= seqNum) {
2644 // Remove it from our watchlist
2647 // Decrement machines that need to see this notification
2648 rm.removeWatcher(machineId);
2653 // Set dead the abort
2654 for (Iterator<Map.Entry<Pair<Long, Long>, Abort>> i = liveAbortTable.entrySet().iterator(); i.hasNext();) {
2655 Abort abort = i.next().getValue();
2657 if ((abort.getTransactionMachineId() == machineId) && (abort.getSequenceNumber() <= seqNum)) {
2661 if (abort.getTransactionArbitrator() == localMachineId) {
2662 liveAbortsGeneratedByLocal.remove(abort.getArbitratorLocalSequenceNumber());
2669 if (machineId == localMachineId) {
2670 // Our own messages are immediately dead.
2671 if (liveness instanceof LastMessage) {
2672 ((LastMessage)liveness).setDead();
2673 } else if (liveness instanceof Slot) {
2674 ((Slot)liveness).setDead();
2676 throw new Error("Unrecognized type");
2680 // Get the old last message for this device
2681 Pair<Long, Liveness> lastMessageEntry = lastMessageTable.put(machineId, new Pair<Long, Liveness>(seqNum, liveness));
2682 if (lastMessageEntry == null) {
2683 // If no last message then there is nothing else to process
2687 long lastMessageSeqNum = lastMessageEntry.getFirst();
2688 Liveness lastEntry = lastMessageEntry.getSecond();
2690 // If it is not our machine Id since we already set ours to dead
2691 if (machineId != localMachineId) {
2692 if (lastEntry instanceof LastMessage) {
2693 ((LastMessage)lastEntry).setDead();
2694 } else if (lastEntry instanceof Slot) {
2695 ((Slot)lastEntry).setDead();
2697 throw new Error("Unrecognized type");
2701 // Make sure the server is not playing any games
2702 if (machineId == localMachineId) {
2704 if (hadPartialSendToServer) {
2705 // We were not making any updates and we had a machine mismatch
2706 if (lastMessageSeqNum > seqNum && !acceptUpdatesToLocal) {
2707 throw new Error("Server Error: Mismatch on local machine sequence number, needed at least: " + lastMessageSeqNum + " got: " + seqNum);
2711 // We were not making any updates and we had a machine mismatch
2712 if (lastMessageSeqNum != seqNum && !acceptUpdatesToLocal) {
2713 throw new Error("Server Error: Mismatch on local machine sequence number, needed: " + lastMessageSeqNum + " got: " + seqNum);
2717 if (lastMessageSeqNum > seqNum) {
2718 throw new Error("Server Error: Rollback on remote machine sequence number");
2724 * Add a rejected message entry to the watch set to keep track of which clients have seen that
2725 * rejected message entry and which have not.
2727 private void addWatchList(long machineId, RejectedMessage entry) {
2728 HashSet<RejectedMessage> entries = rejectedMessageWatchListTable.get(machineId);
2729 if (entries == null) {
2730 // There is no set for this machine ID yet so create one
2731 entries = new HashSet<RejectedMessage>();
2732 rejectedMessageWatchListTable.put(machineId, entries);
2738 * Check if the HMAC chain is not violated
2740 private void checkHMACChain(SlotIndexer indexer, Slot[] newSlots) {
2741 for (int i = 0; i < newSlots.length; i++) {
2742 Slot currSlot = newSlots[i];
2743 Slot prevSlot = indexer.getSlot(currSlot.getSequenceNumber() - 1);
2744 if (prevSlot != null &&
2745 !Arrays.equals(prevSlot.getHMAC(), currSlot.getPrevHMAC()))
2746 throw new Error("Server Error: Invalid HMAC Chain" + currSlot + " " + prevSlot);