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;
17 * IoTTable data structure. Provides client interface.
18 * @author Brian Demsky
22 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 int smallestTableStatusSeen = -1; // Smallest Table Status that was seen in the latest slots sent from the server
49 private int largestTableStatusSeen = -1; // Largest Table Status that was seen in the latest slots sent from the server
50 private long localTransactionSequenceNumber = 0; // Local sequence number counter for transactions
51 private long lastTransactionSequenceNumberSpeculatedOn = -1; // the last transaction that was speculated on
52 private long oldestTransactionSequenceNumberSpeculatedOn = -1; // the oldest transaction that was speculated on
53 private long localArbitrationSequenceNumber = 0;
54 private boolean hadPartialSendToServer = false;
55 private boolean attemptedToSendToServer = false;
58 private Map<IoTString, KeyValue> committedKeyValueTable = null; // Table of committed key value pairs
59 private Map<IoTString, KeyValue> speculatedKeyValueTable = null; // Table of speculated key value pairs, if there is a speculative value
60 private Map<IoTString, KeyValue> pendingTransactionSpeculatedKeyValueTable = null; // Table of speculated key value pairs, if there is a speculative value from the pending transactions
61 private Map<IoTString, NewKey> liveNewKeyTable = null; // Table of live new keys
62 private HashMap<Long, Pair<Long, Liveness>> lastMessageTable = null; // Last message sent by a client machine id -> (Seq Num, Slot or LastMessage);
63 private HashMap<Long, HashSet<RejectedMessage>> rejectedMessageWatchListTable = null; // Table of machine Ids and the set of rejected messages they have not seen yet
64 private Map<IoTString, Long> arbitratorTable = null; // Table of keys and their arbitrators
65 private Map<Pair<Long, Long>, Abort> liveAbortTable = null; // Table live abort messages
66 private Map<Long, Map<Pair<Long, Integer>, TransactionPart>> newTransactionParts = null; // transaction parts that are seen in this latest round of slots from the server
67 private Map<Long, Map<Pair<Long, Integer>, CommitPart>> newCommitParts = null; // commit parts that are seen in this latest round of slots from the server
68 private Map<Long, Long> lastArbitratedTransactionNumberByArbitratorTable = null; // Last transaction sequence number that an arbitrator arbitrated on
69 private Map<Long, Transaction> liveTransactionBySequenceNumberTable = null; // live transaction grouped by the sequence number
70 private Map<Pair<Long, Long>, Transaction> liveTransactionByTransactionIdTable = null; // live transaction grouped by the transaction ID
71 private Map<Long, Map<Long, Commit>> liveCommitsTable = null;
72 private Map<IoTString, Commit> liveCommitsByKeyTable = null;
73 private Map<Long, Long> lastCommitSeenSequenceNumberByArbitratorTable = null;
74 private Vector<Long> rejectedSlotList = null; // List of rejected slots that have yet to be sent to the server
75 private List<Transaction> pendingTransactionQueue = null;
76 private List<ArbitrationRound> pendingSendArbitrationRounds = null;
77 private List<Entry> pendingSendArbitrationEntriesToDelete = null;
78 private Map<Transaction, List<Integer>> transactionPartsSent = null;
79 private Map<Long, TransactionStatus> outstandingTransactionStatus = null;
80 private Map<Long, Abort> liveAbortsGeneratedByLocal = null;
81 private Set<Pair<Long, Long>> offlineTransactionsCommittedAndAtServer = null;
82 private Map<Long, Pair<String, Integer>> localCommunicationTable = null;
83 private Map<Long, Long> lastTransactionSeenFromMachineFromServer = null;
84 private Map<Long, Long> lastArbitrationDataLocalSequenceNumberSeenFromArbitrator = null;
90 public Table(String baseurl, String password, long _localMachineId, int listeningPort) {
91 localMachineId = _localMachineId;
92 cloud = new CloudComm(this, baseurl, password, listeningPort);
97 public Table(CloudComm _cloud, long _localMachineId) {
98 localMachineId = _localMachineId;
105 * Init all the stuff needed for for table usage
107 private void init() {
109 // Init helper objects
110 random = new Random();
111 buffer = new SlotBuffer();
114 oldestLiveSlotSequenceNumver = 1;
117 committedKeyValueTable = new HashMap<IoTString, KeyValue>();
118 speculatedKeyValueTable = new HashMap<IoTString, KeyValue>();
119 pendingTransactionSpeculatedKeyValueTable = new HashMap<IoTString, KeyValue>();
120 liveNewKeyTable = new HashMap<IoTString, NewKey>();
121 lastMessageTable = new HashMap<Long, Pair<Long, Liveness>>();
122 rejectedMessageWatchListTable = new HashMap<Long, HashSet<RejectedMessage>>();
123 arbitratorTable = new HashMap<IoTString, Long>();
124 liveAbortTable = new HashMap<Pair<Long, Long>, Abort>();
125 newTransactionParts = new HashMap<Long, Map<Pair<Long, Integer>, TransactionPart>>();
126 newCommitParts = new HashMap<Long, Map<Pair<Long, Integer>, CommitPart>>();
127 lastArbitratedTransactionNumberByArbitratorTable = new HashMap<Long, Long>();
128 liveTransactionBySequenceNumberTable = new HashMap<Long, Transaction>();
129 liveTransactionByTransactionIdTable = new HashMap<Pair<Long, Long>, Transaction>();
130 liveCommitsTable = new HashMap<Long, Map<Long, Commit>>();
131 liveCommitsByKeyTable = new HashMap<IoTString, Commit>();
132 lastCommitSeenSequenceNumberByArbitratorTable = new HashMap<Long, Long>();
133 rejectedSlotList = new Vector<Long>();
134 pendingTransactionQueue = new ArrayList<Transaction>();
135 pendingSendArbitrationEntriesToDelete = new ArrayList<Entry>();
136 transactionPartsSent = new HashMap<Transaction, List<Integer>>();
137 outstandingTransactionStatus = new HashMap<Long, TransactionStatus>();
138 liveAbortsGeneratedByLocal = new HashMap<Long, Abort>();
139 offlineTransactionsCommittedAndAtServer = new HashSet<Pair<Long, Long>>();
140 localCommunicationTable = new HashMap<Long, Pair<String, Integer>>();
141 lastTransactionSeenFromMachineFromServer = new HashMap<Long, Long>();
142 pendingSendArbitrationRounds = new ArrayList<ArbitrationRound>();
143 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator = new HashMap<Long, Long>();
147 numberOfSlots = buffer.capacity();
148 setResizeThreshold();
151 // TODO: delete method
152 public synchronized void printSlots() {
153 long o = buffer.getOldestSeqNum();
154 long n = buffer.getNewestSeqNum();
156 int[] types = new int[10];
162 for (long i = o; i < (n + 1); i++) {
163 Slot s = buffer.getSlot(i);
165 Vector<Entry> entries = s.getEntries();
167 for (Entry e : entries) {
169 int type = e.getType();
170 types[type] = types[type] + 1;
179 for (int i = 0; i < 10; i++) {
180 System.out.println(i + " " + types[i]);
182 System.out.println("Live count: " + livec);
183 System.out.println("Dead count: " + deadc);
184 System.out.println("Old: " + o);
185 System.out.println("New: " + n);
186 System.out.println("Size: " + buffer.size());
188 // List<IoTString> strList = new ArrayList<IoTString>();
189 // for (int i = 0; i < 100; i++) {
190 // String keyA = "a" + i;
191 // String keyB = "b" + i;
192 // String keyC = "c" + i;
193 // String keyD = "d" + i;
195 // IoTString iKeyA = new IoTString(keyA);
196 // IoTString iKeyB = new IoTString(keyB);
197 // IoTString iKeyC = new IoTString(keyC);
198 // IoTString iKeyD = new IoTString(keyD);
200 // strList.add(iKeyA);
201 // strList.add(iKeyB);
202 // strList.add(iKeyC);
203 // strList.add(iKeyD);
207 // for (Long l : commitMap.keySet()) {
208 // for (Long l2 : commitMap.get(l).keySet()) {
209 // for (KeyValue kv : commitMap.get(l).get(l2).getkeyValueUpdateSet()) {
210 // strList.remove(kv.getKey());
211 // System.out.print(kv.getKey() + " ");
216 // System.out.println();
217 // System.out.println();
219 // for (IoTString s : strList) {
220 // System.out.print(s + " ");
222 // System.out.println();
223 // System.out.println(strList.size());
227 * Initialize the table by inserting a table status as the first entry into the table status
228 * also initialize the crypto stuff.
230 public synchronized void initTable() throws ServerException {
231 cloud.setSalt(); //Set the salt
233 // Create the first insertion into the block chain which is the table status
234 Slot s = new Slot(this, 1, localMachineId);
235 TableStatus status = new TableStatus(s, numberOfSlots);
237 Slot[] array = cloud.putSlot(s, numberOfSlots);
240 array = new Slot[] {s};
241 // update local block chain
242 validateAndUpdate(array, true);
243 } else if (array.length == 1) {
244 // in case we did push the slot BUT we failed to init it
245 validateAndUpdate(array, true);
247 throw new Error("Error on initialization");
252 * Rebuild the table from scratch by pulling the latest block chain from the server.
254 public synchronized void rebuild() throws ServerException {
255 // Just pull the latest slots from the server
256 Slot[] newslots = cloud.getSlots(sequenceNumber + 1);
257 validateAndUpdate(newslots, true);
260 // public String toString() {
261 // String retString = " Committed Table: \n";
262 // retString += "---------------------------\n";
263 // retString += commitedTable.toString();
265 // retString += "\n\n";
267 // retString += " Speculative Table: \n";
268 // retString += "---------------------------\n";
269 // retString += speculativeTable.toString();
274 public synchronized void addLocalCommunication(long arbitrator, String hostName, int portNumber) {
275 localCommunicationTable.put(arbitrator, new Pair<String, Integer>(hostName, portNumber));
278 public synchronized Long getArbitrator(IoTString key) {
279 return arbitratorTable.get(key);
282 public synchronized void close() {
286 public synchronized IoTString getCommitted(IoTString key) {
287 KeyValue kv = committedKeyValueTable.get(key);
290 return kv.getValue();
296 public synchronized IoTString getSpeculative(IoTString key) {
297 KeyValue kv = pendingTransactionSpeculatedKeyValueTable.get(key);
300 kv = speculatedKeyValueTable.get(key);
304 kv = committedKeyValueTable.get(key);
308 return kv.getValue();
314 public synchronized IoTString getCommittedAtomic(IoTString key) {
315 KeyValue kv = committedKeyValueTable.get(key);
317 if (arbitratorTable.get(key) == null) {
318 throw new Error("Key not Found.");
321 // Make sure new key value pair matches the current arbitrator
322 if (!pendingTransactionBuilder.checkArbitrator(arbitratorTable.get(key))) {
323 // TODO: Maybe not throw en error
324 throw new Error("Not all Key Values Match Arbitrator.");
328 pendingTransactionBuilder.addKVGuard(new KeyValue(key, kv.getValue()));
329 return kv.getValue();
331 pendingTransactionBuilder.addKVGuard(new KeyValue(key, null));
336 public synchronized IoTString getSpeculativeAtomic(IoTString key) {
337 if (arbitratorTable.get(key) == null) {
338 throw new Error("Key not Found.");
341 // Make sure new key value pair matches the current arbitrator
342 if (!pendingTransactionBuilder.checkArbitrator(arbitratorTable.get(key))) {
343 // TODO: Maybe not throw en error
344 throw new Error("Not all Key Values Match Arbitrator.");
347 KeyValue kv = pendingTransactionSpeculatedKeyValueTable.get(key);
350 kv = speculatedKeyValueTable.get(key);
354 kv = committedKeyValueTable.get(key);
358 pendingTransactionBuilder.addKVGuard(new KeyValue(key, kv.getValue()));
359 return kv.getValue();
361 pendingTransactionBuilder.addKVGuard(new KeyValue(key, null));
366 public synchronized boolean update() {
368 Slot[] newSlots = cloud.getSlots(sequenceNumber + 1);
369 validateAndUpdate(newSlots, false);
373 } catch (Exception e) {
374 // e.printStackTrace();
380 public synchronized boolean createNewKey(IoTString keyName, long machineId) throws ServerException {
382 if (arbitratorTable.get(keyName) != null) {
383 // There is already an arbitrator
387 NewKey newKey = new NewKey(null, keyName, machineId);
388 if (sendToServer(newKey)) {
389 // If successfully inserted
395 public synchronized void startTransaction() {
396 // Create a new transaction, invalidates any old pending transactions.
397 pendingTransactionBuilder = new PendingTransaction(localMachineId);
400 public synchronized void addKV(IoTString key, IoTString value) {
402 // Make sure it is a valid key
403 if (arbitratorTable.get(key) == null) {
404 throw new Error("Key not Found.");
407 // Make sure new key value pair matches the current arbitrator
408 if (!pendingTransactionBuilder.checkArbitrator(arbitratorTable.get(key))) {
409 // TODO: Maybe not throw en error
410 throw new Error("Not all Key Values Match Arbitrator.");
413 // Add the key value to this transaction
414 KeyValue kv = new KeyValue(key, value);
415 pendingTransactionBuilder.addKV(kv);
418 public synchronized TransactionStatus commitTransaction() {
420 if (pendingTransactionBuilder.getKVUpdates().size() == 0) {
421 // transaction with no updates will have no effect on the system
422 return new TransactionStatus(TransactionStatus.StatusNoEffect, -1);
425 // Set the local transaction sequence number and increment
426 pendingTransactionBuilder.setClientLocalSequenceNumber(localTransactionSequenceNumber);
427 localTransactionSequenceNumber++;
429 // Create the transaction status
430 TransactionStatus transactionStatus = new TransactionStatus(TransactionStatus.StatusPending, pendingTransactionBuilder.getArbitrator());
432 // Create the new transaction
433 Transaction newTransaction = pendingTransactionBuilder.createTransaction();
434 newTransaction.setTransactionStatus(transactionStatus);
436 if (pendingTransactionBuilder.getArbitrator() != localMachineId) {
437 // Add it to the queue and invalidate the builder for safety
438 pendingTransactionQueue.add(newTransaction);
440 arbitrateOnLocalTransaction(newTransaction);
441 updateLiveStateFromLocal();
444 pendingTransactionBuilder = new PendingTransaction(localMachineId);
448 } catch (ServerException e) {
450 Set<Long> arbitratorTriedAndFailed = new HashSet<Long>();
451 for (Iterator<Transaction> iter = pendingTransactionQueue.iterator(); iter.hasNext(); ) {
452 Transaction transaction = iter.next();
454 if (arbitratorTriedAndFailed.contains(transaction.getArbitrator())) {
455 // Already contacted this client so ignore all attempts to contact this client
456 // to preserve ordering for arbitrator
460 Pair<Boolean, Boolean> sendReturn = sendTransactionToLocal(transaction);
462 if (sendReturn.getFirst()) {
463 // Failed to contact over local
464 arbitratorTriedAndFailed.add(transaction.getArbitrator());
466 // Successful contact or should not contact
468 if (sendReturn.getSecond()) {
476 return transactionStatus;
480 * Get the machine ID for this client
482 public long getMachineId() {
483 return localMachineId;
487 * Decrement the number of live slots that we currently have
489 public void decrementLiveCount() {
494 * Recalculate the new resize threshold
496 private void setResizeThreshold() {
497 int resizeLower = (int) (RESIZE_THRESHOLD * numberOfSlots);
498 bufferResizeThreshold = resizeLower - 1 + random.nextInt(numberOfSlots - resizeLower);
501 private boolean sendToServer(NewKey newKey) throws ServerException {
504 // While we have stuff that needs inserting into the block chain
505 while ((pendingTransactionQueue.size() > 0) || (pendingSendArbitrationRounds.size() > 0) || (newKey != null)) {
508 Slot slot = new Slot(this, sequenceNumber + 1, localMachineId, buffer.getSlot(sequenceNumber).getHMAC());
510 // Try to fill the slot with data
511 ThreeTuple<Boolean, Integer, Boolean> fillSlotsReturn = fillSlot(slot, false, newKey);
512 boolean needsResize = fillSlotsReturn.getFirst();
513 int newSize = fillSlotsReturn.getSecond();
514 Boolean insertedNewKey = fillSlotsReturn.getThird();
517 // Reset which transaction to send
518 for (Transaction transaction : transactionPartsSent.keySet()) {
519 transaction.resetNextPartToSend();
521 // Set the transaction sequence number back to nothing
522 if (!transaction.didSendAPartToServer()) {
523 transaction.setSequenceNumber(-1);
527 // Clear the sent data since we are trying again
528 pendingSendArbitrationEntriesToDelete.clear();
529 transactionPartsSent.clear();
531 // We needed a resize so try again
532 fillSlot(slot, true, newKey);
535 // Try to send to the server
536 ThreeTuple<Boolean, Boolean, Slot[]> sendSlotsReturn = sendSlotsToServer(slot, newSize, newKey != null);
538 // if (sendSlotsReturn.getSecond()) {
539 // System.out.println("Second was true");
543 if (/*sendSlotsReturn.getSecond() || */sendSlotsReturn.getFirst()) {
544 // Did insert into the block chain
546 if (sendSlotsReturn.getFirst()) {
547 // This slot was what was inserted not a previous slot
549 // New Key was successfully inserted into the block chain so dont want to insert it again
553 // Remove the aborts and commit parts that were sent from the pending to send queue
554 for (Iterator<ArbitrationRound> iter = pendingSendArbitrationRounds.iterator(); iter.hasNext(); ) {
555 ArbitrationRound round = iter.next();
556 round.removeParts(pendingSendArbitrationEntriesToDelete);
558 if (round.isDoneSending()) {
559 // Sent all the parts
565 for (Transaction transaction : transactionPartsSent.keySet()) {
567 // Update which transactions parts still need to be sent
568 transaction.removeSentParts(transactionPartsSent.get(transaction));
570 // Add the transaction status to the outstanding list
571 outstandingTransactionStatus.put(transaction.getSequenceNumber(), transaction.getTransactionStatus());
573 // Update the transaction status
574 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentPartial);
576 // Check if all the transaction parts were successfully sent and if so then remove it from pending
577 if (transaction.didSendAllParts()) {
578 transaction.getTransactionStatus().setStatus(TransactionStatus.StatusSentFully);
579 pendingTransactionQueue.remove(transaction);
583 // Reset which transaction to send
584 for (Transaction transaction : transactionPartsSent.keySet()) {
585 transaction.resetNextPartToSend();
587 // Set the transaction sequence number back to nothing
588 if (!transaction.didSendAPartToServer()) {
589 transaction.setSequenceNumber(-1);
594 // Clear the sent data in preparation for next send
595 pendingSendArbitrationEntriesToDelete.clear();
596 transactionPartsSent.clear();
598 if (sendSlotsReturn.getThird().length != 0) {
599 // insert into the local block chain
600 validateAndUpdate(sendSlotsReturn.getThird(), true);
603 } catch (ServerException e) {
605 if (e.getType() != ServerException.TypeInputTimeout) {
606 // e.printStackTrace();
608 // Nothing was able to be sent to the server so just clear these data structures
609 for (Transaction transaction : transactionPartsSent.keySet()) {
610 // Set the transaction sequence number back to nothing
611 if (!transaction.didSendAPartToServer()) {
612 transaction.setSequenceNumber(-1);
616 // There was a partial send to the server
617 hadPartialSendToServer = true;
620 pendingSendArbitrationEntriesToDelete.clear();
621 transactionPartsSent.clear();
626 return newKey == null;
629 private Pair<Boolean, Boolean> sendTransactionToLocal(Transaction transaction) {
631 // Get the devices local communications
632 Pair<String, Integer> localCommunicationInformation = localCommunicationTable.get(transaction.getArbitrator());
634 if (localCommunicationInformation == null) {
635 // Cant talk to that device locally so do nothing
636 return new Pair<Boolean, Boolean>(false, false);
639 // Get the size of the send data
640 int sendDataSize = Integer.BYTES + Long.BYTES;
641 for (TransactionPart part : transaction.getParts().values()) {
642 sendDataSize += part.getSize();
645 Long lastArbitrationDataLocalSequenceNumber = (long) - 1;
646 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(transaction.getArbitrator()) != null) {
647 lastArbitrationDataLocalSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(transaction.getArbitrator());
650 // Make the send data size
651 byte[] sendData = new byte[sendDataSize];
652 ByteBuffer bbEncode = ByteBuffer.wrap(sendData);
655 bbEncode.putLong(lastArbitrationDataLocalSequenceNumber);
656 bbEncode.putInt(transaction.getParts().size());
657 for (TransactionPart part : transaction.getParts().values()) {
658 part.encode(bbEncode);
672 System.out.println("================================");
673 System.out.println("Sending Locally");
674 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
675 System.out.println(kv);
689 byte[] returnData = cloud.sendLocalData(sendData, localCommunicationInformation.getFirst(), localCommunicationInformation.getSecond());
692 System.out.println("--------------------------------");
693 System.out.println();
695 if (returnData == null) {
696 // Could not contact server
697 return new Pair<Boolean, Boolean>(true, false);
701 ByteBuffer bbDecode = ByteBuffer.wrap(returnData);
702 boolean didCommit = bbDecode.get() == 1;
703 boolean couldArbitrate = bbDecode.get() == 1;
704 int numberOfEntries = bbDecode.getInt();
705 boolean foundAbort = false;
707 for (int i = 0; i < numberOfEntries; i++) {
708 byte type = bbDecode.get();
709 if (type == Entry.TypeAbort) {
710 Abort abort = (Abort)Abort.decode(null, bbDecode);
712 if ((abort.getTransactionMachineId() == localMachineId) && (abort.getTransactionClientLocalSequenceNumber() == transaction.getClientLocalSequenceNumber())) {
717 } else if (type == Entry.TypeCommitPart) {
718 CommitPart commitPart = (CommitPart)CommitPart.decode(null, bbDecode);
719 processEntry(commitPart);
723 updateLiveStateFromLocal();
725 if (couldArbitrate) {
726 TransactionStatus status = transaction.getTransactionStatus();
728 status.setStatus(TransactionStatus.StatusCommitted);
730 status.setStatus(TransactionStatus.StatusAborted);
734 TransactionStatus status = transaction.getTransactionStatus();
735 status.setStatus(TransactionStatus.StatusAborted);
736 return new Pair<Boolean, Boolean>(false, false);
740 return new Pair<Boolean, Boolean>(false, true);
743 public synchronized byte[] acceptDataFromLocal(byte[] data) {
745 ByteBuffer bbDecode = ByteBuffer.wrap(data);
746 long lastArbitratedSequenceNumberSeen = bbDecode.getLong();
747 int numberOfParts = bbDecode.getInt();
749 // If we did commit a transaction or not
750 boolean didCommit = false;
751 boolean couldArbitrate = false;
753 if (numberOfParts != 0) {
755 // decode the transaction
756 Transaction transaction = new Transaction();
757 for (int i = 0; i < numberOfParts; i++) {
759 TransactionPart newPart = (TransactionPart)TransactionPart.decode(null, bbDecode);
760 transaction.addPartDecode(newPart);
763 // Arbitrate on transaction and pull relevant return data
764 Pair<Boolean, Boolean> localArbitrateReturn = arbitrateOnLocalTransaction(transaction);
765 couldArbitrate = localArbitrateReturn.getFirst();
766 didCommit = localArbitrateReturn.getSecond();
768 updateLiveStateFromLocal();
770 // Transaction was sent to the server so keep track of it to prevent double commit
771 if (transaction.getSequenceNumber() != -1) {
772 offlineTransactionsCommittedAndAtServer.add(transaction.getId());
776 // The data to send back
777 int returnDataSize = 0;
778 List<Entry> unseenArbitrations = new ArrayList<Entry>();
780 // Get the aborts to send back
781 List<Long> abortLocalSequenceNumbers = new ArrayList<Long >(liveAbortsGeneratedByLocal.keySet());
782 Collections.sort(abortLocalSequenceNumbers);
783 for (Long localSequenceNumber : abortLocalSequenceNumbers) {
784 if (localSequenceNumber <= lastArbitratedSequenceNumberSeen) {
788 Abort abort = liveAbortsGeneratedByLocal.get(localSequenceNumber);
789 unseenArbitrations.add(abort);
790 returnDataSize += abort.getSize();
793 // Get the commits to send back
794 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(localMachineId);
795 if (commitForClientTable != null) {
796 List<Long> commitLocalSequenceNumbers = new ArrayList<Long>(commitForClientTable.keySet());
797 Collections.sort(commitLocalSequenceNumbers);
799 for (Long localSequenceNumber : commitLocalSequenceNumbers) {
800 Commit commit = commitForClientTable.get(localSequenceNumber);
802 if (localSequenceNumber <= lastArbitratedSequenceNumberSeen) {
806 System.out.println("---");
807 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
808 System.out.println("Sending Commit Locally: " + kv);
810 System.out.println("---");
812 unseenArbitrations.addAll(commit.getParts().values());
814 for (CommitPart commitPart : commit.getParts().values()) {
815 returnDataSize += commitPart.getSize();
820 // Number of arbitration entries to decode
821 returnDataSize += 2 * Integer.BYTES;
823 // Boolean of did commit or not
824 if (numberOfParts != 0) {
825 returnDataSize += Byte.BYTES;
829 byte[] returnData = new byte[returnDataSize];
830 ByteBuffer bbEncode = ByteBuffer.wrap(returnData);
832 if (numberOfParts != 0) {
834 bbEncode.put((byte)1);
836 bbEncode.put((byte)0);
838 if (couldArbitrate) {
839 bbEncode.put((byte)1);
841 bbEncode.put((byte)0);
845 bbEncode.putInt(unseenArbitrations.size());
846 for (Entry entry : unseenArbitrations) {
847 entry.encode(bbEncode);
853 private ThreeTuple<Boolean, Boolean, Slot[]> sendSlotsToServer(Slot slot, int newSize, boolean isNewKey) throws ServerException {
855 boolean attemptedToSendToServerTmp = attemptedToSendToServer;
856 attemptedToSendToServer = true;
858 boolean inserted = false;
859 boolean lastTryInserted = false;
861 Slot[] array = cloud.putSlot(slot, newSize);
863 array = new Slot[] {slot};
864 rejectedSlotList.clear();
867 if (array.length == 0) {
868 throw new Error("Server Error: Did not send any slots");
871 // if (attemptedToSendToServerTmp) {
872 if (hadPartialSendToServer) {
874 boolean isInserted = false;
875 for (Slot s : array) {
876 if ((s.getSequenceNumber() == slot.getSequenceNumber()) && (s.getMachineID() == localMachineId)) {
882 for (Slot s : array) {
887 // Process each entry in the slot
888 for (Entry entry : s.getEntries()) {
890 if (entry.getType() == Entry.TypeLastMessage) {
891 LastMessage lastMessage = (LastMessage)entry;
893 if ((lastMessage.getMachineID() == localMachineId) && (lastMessage.getSequenceNumber() == slot.getSequenceNumber())) {
902 rejectedSlotList.add(slot.getSequenceNumber());
903 lastTryInserted = false;
905 lastTryInserted = true;
908 rejectedSlotList.add(slot.getSequenceNumber());
909 lastTryInserted = false;
913 return new ThreeTuple<Boolean, Boolean, Slot[]>(inserted, lastTryInserted, array);
917 * Returns false if a resize was needed
919 private ThreeTuple<Boolean, Integer, Boolean> fillSlot(Slot slot, boolean resize, NewKey newKeyEntry) {
921 if (liveSlotCount > bufferResizeThreshold) {
922 resize = true; //Resize is forced
926 newSize = (int) (numberOfSlots * RESIZE_MULTIPLE);
927 TableStatus status = new TableStatus(slot, newSize);
928 slot.addEntry(status);
931 // Fill with rejected slots first before doing anything else
932 doRejectedMessages(slot);
934 // Do mandatory rescue of entries
935 ThreeTuple<Boolean, Boolean, Long> mandatoryRescueReturn = doMandatoryResuce(slot, resize);
937 // Extract working variables
938 boolean needsResize = mandatoryRescueReturn.getFirst();
939 boolean seenLiveSlot = mandatoryRescueReturn.getSecond();
940 long currentRescueSequenceNumber = mandatoryRescueReturn.getThird();
942 if (needsResize && !resize) {
943 // We need to resize but we are not resizing so return false
944 return new ThreeTuple<Boolean, Integer, Boolean>(true, null, null);
947 boolean inserted = false;
948 if (newKeyEntry != null) {
949 newKeyEntry.setSlot(slot);
950 if (slot.hasSpace(newKeyEntry)) {
951 slot.addEntry(newKeyEntry);
956 // Clear the transactions, aborts and commits that were sent previously
957 transactionPartsSent.clear();
958 pendingSendArbitrationEntriesToDelete.clear();
960 for (ArbitrationRound round : pendingSendArbitrationRounds) {
961 boolean isFull = false;
962 round.generateParts();
963 List<Entry> parts = round.getParts();
965 // Insert pending arbitration data
966 for (Entry arbitrationData : parts) {
968 // If it is an abort then we need to set some information
969 if (arbitrationData instanceof Abort) {
970 ((Abort)arbitrationData).setSequenceNumber(slot.getSequenceNumber());
973 if (!slot.hasSpace(arbitrationData)) {
974 // No space so cant do anything else with these data entries
979 // Add to this current slot and add it to entries to delete
980 slot.addEntry(arbitrationData);
981 pendingSendArbitrationEntriesToDelete.add(arbitrationData);
989 // Insert as many transactions as possible while keeping order
990 for (Transaction transaction : pendingTransactionQueue) {
992 // Set the transaction sequence number if it has yet to be inserted into the block chain
993 if (!transaction.didSendAPartToServer()) {
994 transaction.setSequenceNumber(slot.getSequenceNumber());
997 boolean ranOutOfSpace = false;
1000 TransactionPart part = transaction.getNextPartToSend();
1003 // Ran out of parts to send for this transaction so move on
1007 if (slot.hasSpace(part)) {
1008 slot.addEntry(part);
1010 List<Integer> partsSent = transactionPartsSent.get(transaction);
1011 if (partsSent == null) {
1012 partsSent = new ArrayList<Integer>();
1013 transactionPartsSent.put(transaction, partsSent);
1016 partsSent.add(part.getPartNumber());
1017 transactionPartsSent.put(transaction, partsSent);
1020 ranOutOfSpace = true;
1025 if (ranOutOfSpace) {
1030 // Fill the remainder of the slot with rescue data
1031 doOptionalRescue(slot, seenLiveSlot, currentRescueSequenceNumber, resize);
1033 return new ThreeTuple<Boolean, Integer, Boolean>(false, newSize, inserted);
1036 private void doRejectedMessages(Slot s) {
1037 if (! rejectedSlotList.isEmpty()) {
1038 /* TODO: We should avoid generating a rejected message entry if
1039 * there is already a sufficient entry in the queue (e.g.,
1040 * equalsto value of true and same sequence number). */
1042 long old_seqn = rejectedSlotList.firstElement();
1043 if (rejectedSlotList.size() > REJECTED_THRESHOLD) {
1044 long new_seqn = rejectedSlotList.lastElement();
1045 RejectedMessage rm = new RejectedMessage(s, localMachineId, old_seqn, new_seqn, false);
1048 long prev_seqn = -1;
1050 /* Go through list of missing messages */
1051 for (; i < rejectedSlotList.size(); i++) {
1052 long curr_seqn = rejectedSlotList.get(i);
1053 Slot s_msg = buffer.getSlot(curr_seqn);
1056 prev_seqn = curr_seqn;
1058 /* Generate rejected message entry for missing messages */
1059 if (prev_seqn != -1) {
1060 RejectedMessage rm = new RejectedMessage(s, localMachineId, old_seqn, prev_seqn, false);
1063 /* Generate rejected message entries for present messages */
1064 for (; i < rejectedSlotList.size(); i++) {
1065 long curr_seqn = rejectedSlotList.get(i);
1066 Slot s_msg = buffer.getSlot(curr_seqn);
1067 long machineid = s_msg.getMachineID();
1068 RejectedMessage rm = new RejectedMessage(s, machineid, curr_seqn, curr_seqn, true);
1075 private ThreeTuple<Boolean, Boolean, Long> doMandatoryResuce(Slot slot, boolean resize) {
1076 long newestSequenceNumber = buffer.getNewestSeqNum();
1077 long oldestSequenceNumber = buffer.getOldestSeqNum();
1078 if (oldestLiveSlotSequenceNumver < oldestSequenceNumber) {
1079 oldestLiveSlotSequenceNumver = oldestSequenceNumber;
1082 long currentSequenceNumber = oldestLiveSlotSequenceNumver;
1083 boolean seenLiveSlot = false;
1084 long firstIfFull = newestSequenceNumber + 1 - numberOfSlots; // smallest seq number in the buffer if it is full
1085 long threshold = firstIfFull + FREE_SLOTS; // we want the buffer to be clear of live entries up to this point
1089 for (; currentSequenceNumber < threshold; currentSequenceNumber++) {
1090 Slot previousSlot = buffer.getSlot(currentSequenceNumber);
1091 // Push slot number forward
1092 if (! seenLiveSlot) {
1093 oldestLiveSlotSequenceNumver = currentSequenceNumber;
1096 if (!previousSlot.isLive()) {
1100 // We have seen a live slot
1101 seenLiveSlot = true;
1103 // Get all the live entries for a slot
1104 Vector<Entry> liveEntries = previousSlot.getLiveEntries(resize);
1106 // Iterate over all the live entries and try to rescue them
1107 for (Entry liveEntry : liveEntries) {
1108 if (slot.hasSpace(liveEntry)) {
1110 // Enough space to rescue the entry
1111 slot.addEntry(liveEntry);
1112 } else if (currentSequenceNumber == firstIfFull) {
1113 //if there's no space but the entry is about to fall off the queue
1114 System.out.println("B"); //?
1115 return new ThreeTuple<Boolean, Boolean, Long>(true, seenLiveSlot, currentSequenceNumber);
1122 return new ThreeTuple<Boolean, Boolean, Long>(false, seenLiveSlot, currentSequenceNumber);
1125 private void doOptionalRescue(Slot s, boolean seenliveslot, long seqn, boolean resize) {
1126 /* now go through live entries from least to greatest sequence number until
1127 * either all live slots added, or the slot doesn't have enough room
1128 * for SKIP_THRESHOLD consecutive entries*/
1130 long newestseqnum = buffer.getNewestSeqNum();
1132 for (; seqn <= newestseqnum; seqn++) {
1133 Slot prevslot = buffer.getSlot(seqn);
1134 //Push slot number forward
1136 oldestLiveSlotSequenceNumver = seqn;
1138 if (!prevslot.isLive())
1140 seenliveslot = true;
1141 Vector<Entry> liveentries = prevslot.getLiveEntries(resize);
1142 for (Entry liveentry : liveentries) {
1143 if (s.hasSpace(liveentry))
1144 s.addEntry(liveentry);
1147 if (skipcount > SKIP_THRESHOLD)
1155 * Checks for malicious activity and updates the local copy of the block chain.
1157 private void validateAndUpdate(Slot[] newSlots, boolean acceptUpdatesToLocal) {
1159 // The cloud communication layer has checked slot HMACs already before decoding
1160 if (newSlots.length == 0) {
1164 // Reset the table status declared sizes
1165 smallestTableStatusSeen = -1;
1166 largestTableStatusSeen = -1;
1169 // Make sure all slots are newer than the last largest slot this client has seen
1170 long firstSeqNum = newSlots[0].getSequenceNumber();
1171 if (firstSeqNum <= sequenceNumber) {
1172 throw new Error("Server Error: Sent older slots!");
1175 // Create an object that can access both new slots and slots in our local chain
1176 // without committing slots to our local chain
1177 SlotIndexer indexer = new SlotIndexer(newSlots, buffer);
1179 // Check that the HMAC chain is not broken
1180 checkHMACChain(indexer, newSlots);
1182 // Set to keep track of messages from clients
1183 HashSet<Long> machineSet = new HashSet<Long>(lastMessageTable.keySet());
1185 // Process each slots data
1186 for (Slot slot : newSlots) {
1187 processSlot(indexer, slot, acceptUpdatesToLocal, machineSet);
1190 // If there is a gap, check to see if the server sent us everything.
1191 if (firstSeqNum != (sequenceNumber + 1)) {
1193 // Check the size of the slots that were sent down by the server.
1194 // Can only check the size if there was a gap
1195 checkNumSlots(newSlots.length);
1197 // Since there was a gap every machine must have pushed a slot or must have
1198 // a last message message. If not then the server is hiding slots
1199 if (!machineSet.isEmpty()) {
1200 throw new Error("Missing record for machines: " + machineSet);
1204 // Update the size of our local block chain.
1207 // Commit new to slots to the local block chain.
1208 for (Slot slot : newSlots) {
1210 // Insert this slot into our local block chain copy.
1211 buffer.putSlot(slot);
1213 // Keep track of how many slots are currently live (have live data in them).
1217 // Get the sequence number of the latest slot in the system
1218 sequenceNumber = newSlots[newSlots.length - 1].getSequenceNumber();
1220 updateLiveStateFromServer();
1222 // No Need to remember after we pulled from the server
1223 offlineTransactionsCommittedAndAtServer.clear();
1225 // This is invalidated now
1226 hadPartialSendToServer = false;
1229 private void updateLiveStateFromServer() {
1230 // Process the new transaction parts
1231 processNewTransactionParts();
1233 // Do arbitration on new transactions that were received
1234 arbitrateFromServer();
1236 // Update all the committed keys
1237 boolean didCommitOrSpeculate = updateCommittedTable();
1239 // Delete the transactions that are now dead
1240 updateLiveTransactionsAndStatus();
1243 didCommitOrSpeculate |= updateSpeculativeTable(didCommitOrSpeculate);
1244 updatePendingTransactionSpeculativeTable(didCommitOrSpeculate);
1247 private void updateLiveStateFromLocal() {
1248 // Update all the committed keys
1249 boolean didCommitOrSpeculate = updateCommittedTable();
1251 // Delete the transactions that are now dead
1252 updateLiveTransactionsAndStatus();
1255 didCommitOrSpeculate |= updateSpeculativeTable(didCommitOrSpeculate);
1256 updatePendingTransactionSpeculativeTable(didCommitOrSpeculate);
1260 * Check the size of the block chain to make sure there are enough slots sent back by the server.
1261 * This is only called when we have a gap between the slots that we have locally and the slots
1262 * sent by the server therefore in the slots sent by the server there will be at least 1 Table
1265 private void checkNumSlots(int numberOfSlots) {
1267 // We only have 1 size so we must have this many slots
1268 if (largestTableStatusSeen == smallestTableStatusSeen) {
1269 if (numberOfSlots != smallestTableStatusSeen) {
1270 throw new Error("Server Error: Server did not send all slots. Expected: " + smallestTableStatusSeen + " Received:" + numberOfSlots);
1273 // We have more than 1
1274 if (numberOfSlots < smallestTableStatusSeen) {
1275 throw new Error("Server Error: Server did not send all slots. Expected at least: " + smallestTableStatusSeen + " Received:" + numberOfSlots);
1281 * Update the size of of the local buffer if it is needed.
1283 private void commitNewMaxSize() {
1285 int currMaxSize = 0;
1287 if (largestTableStatusSeen == -1) {
1288 // No table status seen so the current max size does not change
1289 currMaxSize = numberOfSlots;
1291 currMaxSize = largestTableStatusSeen;
1294 // Resize the local slot buffer
1295 if (numberOfSlots != currMaxSize) {
1296 buffer.resize(currMaxSize);
1299 // Change the number of local slots to the new size
1300 numberOfSlots = currMaxSize;
1302 // Recalculate the resize threshold since the size of the local buffer has changed
1303 setResizeThreshold();
1307 * Process the new transaction parts from this latest round of slots received from the server
1309 private void processNewTransactionParts() {
1311 if (newTransactionParts.size() == 0) {
1312 // Nothing new to process
1316 // Iterate through all the machine Ids that we received new parts for
1317 for (Long machineId : newTransactionParts.keySet()) {
1318 Map<Pair<Long, Integer>, TransactionPart> parts = newTransactionParts.get(machineId);
1320 // Iterate through all the parts for that machine Id
1321 for (Pair<Long, Integer> partId : parts.keySet()) {
1322 TransactionPart part = parts.get(partId);
1324 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(part.getArbitratorId());
1325 if ((lastTransactionNumber != null) && (lastTransactionNumber >= part.getSequenceNumber())) {
1326 // Set dead the transaction part
1331 // Get the transaction object for that sequence number
1332 Transaction transaction = liveTransactionBySequenceNumberTable.get(part.getSequenceNumber());
1334 if (transaction == null) {
1335 // This is a new transaction that we dont have so make a new one
1336 transaction = new Transaction();
1338 // Insert this new transaction into the live tables
1339 liveTransactionBySequenceNumberTable.put(part.getSequenceNumber(), transaction);
1340 liveTransactionByTransactionIdTable.put(part.getTransactionId(), transaction);
1343 // Add that part to the transaction
1344 transaction.addPartDecode(part);
1348 // Clear all the new transaction parts in preparation for the next time the server sends slots
1349 newTransactionParts.clear();
1352 private void arbitrateFromServer() {
1354 if (liveTransactionBySequenceNumberTable.size() == 0) {
1355 // Nothing to arbitrate on so move on
1359 // Get the transaction sequence numbers and sort from oldest to newest
1360 List<Long> transactionSequenceNumbers = new ArrayList<Long>(liveTransactionBySequenceNumberTable.keySet());
1361 Collections.sort(transactionSequenceNumbers);
1363 // Collection of key value pairs that are
1364 Map<IoTString, KeyValue> speculativeTableTmp = new HashMap<IoTString, KeyValue>();
1366 // The last transaction arbitrated on
1367 long lastTransactionCommitted = -1;
1368 Set<Abort> generatedAborts = new HashSet<Abort>();
1370 for (Long transactionSequenceNumber : transactionSequenceNumbers) {
1371 Transaction transaction = liveTransactionBySequenceNumberTable.get(transactionSequenceNumber);
1373 // Check if this machine arbitrates for this transaction if not then we cant arbitrate this transaction
1374 if (transaction.getArbitrator() != localMachineId) {
1378 if (offlineTransactionsCommittedAndAtServer.contains(transaction.getId())) {
1379 // We have seen this already locally so dont commit again
1384 if (!transaction.isComplete()) {
1385 // Will arbitrate in incorrect order if we continue so just break
1390 // update the largest transaction seen by arbitrator from server
1391 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) == null) {
1392 lastTransactionSeenFromMachineFromServer.put(transaction.getMachineId(), transaction.getClientLocalSequenceNumber());
1394 Long lastTransactionSeenFromMachine = lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId());
1395 if (transaction.getClientLocalSequenceNumber() > lastTransactionSeenFromMachine) {
1396 lastTransactionSeenFromMachineFromServer.put(transaction.getMachineId(), transaction.getClientLocalSequenceNumber());
1400 if (transaction.evaluateGuard(committedKeyValueTable, speculativeTableTmp, null)) {
1401 // Guard evaluated as true
1403 // Update the local changes so we can make the commit
1404 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1405 speculativeTableTmp.put(kv.getKey(), kv);
1408 // Update what the last transaction committed was for use in batch commit
1409 lastTransactionCommitted = transaction.getSequenceNumber();
1412 // Guard evaluated was false so create abort
1415 Abort newAbort = new Abort(null,
1416 transaction.getClientLocalSequenceNumber(),
1417 transaction.getSequenceNumber(),
1418 transaction.getMachineId(),
1419 transaction.getArbitrator(),
1420 localArbitrationSequenceNumber);
1421 localArbitrationSequenceNumber++;
1423 generatedAborts.add(newAbort);
1425 // Insert the abort so we can process
1426 processEntry(newAbort);
1430 Commit newCommit = null;
1432 // If there is something to commit
1433 if (speculativeTableTmp.size() != 0) {
1435 // Create the commit and increment the commit sequence number
1436 newCommit = new Commit(localArbitrationSequenceNumber, localMachineId, lastTransactionCommitted);
1437 localArbitrationSequenceNumber++;
1439 // Add all the new keys to the commit
1440 for (KeyValue kv : speculativeTableTmp.values()) {
1441 newCommit.addKV(kv);
1444 // create the commit parts
1445 newCommit.createCommitParts();
1447 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1449 // Insert the commit so we can process it
1450 for (CommitPart commitPart : newCommit.getParts().values()) {
1451 processEntry(commitPart);
1456 if ((newCommit != null) || (generatedAborts.size() > 0)) {
1457 ArbitrationRound arbitrationRound = new ArbitrationRound(newCommit, generatedAborts);
1458 pendingSendArbitrationRounds.add(arbitrationRound);
1460 if (compactArbitrationData()) {
1461 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1462 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1463 processEntry(commitPart);
1469 private Pair<Boolean, Boolean> arbitrateOnLocalTransaction(Transaction transaction) {
1471 // Check if this machine arbitrates for this transaction if not then we cant arbitrate this transaction
1472 if (transaction.getArbitrator() != localMachineId) {
1473 return new Pair<Boolean, Boolean>(false, false);
1476 if (!transaction.isComplete()) {
1477 // Will arbitrate in incorrect order if we continue so just break
1479 return new Pair<Boolean, Boolean>(false, false);
1482 if (transaction.getMachineId() != localMachineId) {
1483 // dont do this check for local transactions
1484 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) != null) {
1485 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) > transaction.getClientLocalSequenceNumber()) {
1486 // We've have already seen this from the server
1488 System.out.println("Local Arbitrate Seen Already from server, rejected");
1489 return new Pair<Boolean, Boolean>(false, false);
1494 if (transaction.evaluateGuard(committedKeyValueTable, null, null)) {
1495 // Guard evaluated as true
1497 // Create the commit and increment the commit sequence number
1498 Commit newCommit = new Commit(localArbitrationSequenceNumber, localMachineId, -1);
1499 localArbitrationSequenceNumber++;
1501 // Update the local changes so we can make the commit
1502 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1503 newCommit.addKV(kv);
1506 // create the commit parts
1507 newCommit.createCommitParts();
1509 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1510 ArbitrationRound arbitrationRound = new ArbitrationRound(newCommit, new HashSet<Abort>());
1511 pendingSendArbitrationRounds.add(arbitrationRound);
1513 if (compactArbitrationData()) {
1514 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1515 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1516 processEntry(commitPart);
1519 // Insert the commit so we can process it
1520 for (CommitPart commitPart : newCommit.getParts().values()) {
1521 processEntry(commitPart);
1525 if (transaction.getMachineId() == localMachineId) {
1526 TransactionStatus status = transaction.getTransactionStatus();
1527 if (status != null) {
1528 status.setStatus(TransactionStatus.StatusCommitted);
1532 updateLiveStateFromLocal();
1533 return new Pair<Boolean, Boolean>(true, true);
1536 if (transaction.getMachineId() == localMachineId) {
1537 // For locally created messages update the status
1539 // Guard evaluated was false so create abort
1540 TransactionStatus status = transaction.getTransactionStatus();
1541 if (status != null) {
1542 status.setStatus(TransactionStatus.StatusAborted);
1546 Set addAbortSet = new HashSet<Abort>();
1550 Abort newAbort = new Abort(null,
1551 transaction.getClientLocalSequenceNumber(),
1553 transaction.getMachineId(),
1554 transaction.getArbitrator(),
1555 localArbitrationSequenceNumber);
1556 localArbitrationSequenceNumber++;
1558 addAbortSet.add(newAbort);
1561 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1562 ArbitrationRound arbitrationRound = new ArbitrationRound(null, addAbortSet);
1563 pendingSendArbitrationRounds.add(arbitrationRound);
1565 if (compactArbitrationData()) {
1566 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1567 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1568 processEntry(commitPart);
1573 updateLiveStateFromLocal();
1574 return new Pair<Boolean, Boolean>(true, false);
1579 * 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
1581 private boolean compactArbitrationData() {
1584 if (pendingSendArbitrationRounds.size() < 2) {
1585 // Nothing to compact so do nothing
1589 ArbitrationRound lastRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1590 if (lastRound.didSendPart()) {
1594 boolean hadCommit = (lastRound.getCommit() == null);
1595 boolean gotNewCommit = false;
1597 int numberToDelete = 1;
1598 while (numberToDelete < pendingSendArbitrationRounds.size()) {
1599 ArbitrationRound round = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - numberToDelete - 1);
1601 if (round.isFull() || round.didSendPart()) {
1602 // Stop since there is a part that cannot be compacted and we need to compact in order
1606 if (round.getCommit() == null) {
1608 // Try compacting aborts only
1609 int newSize = round.getCurrentSize() + lastRound.getAbortsCount();
1610 if (newSize > ArbitrationRound.MAX_PARTS) {
1611 // Cant compact since it would be too large
1614 lastRound.addAborts(round.getAborts());
1617 // Create a new larger commit
1618 Commit newCommit = Commit.merge(lastRound.getCommit(), round.getCommit(), localArbitrationSequenceNumber);
1619 localArbitrationSequenceNumber++;
1621 // Create the commit parts so that we can count them
1622 newCommit.createCommitParts();
1624 // Calculate the new size of the parts
1625 int newSize = newCommit.getNumberOfParts();
1626 newSize += lastRound.getAbortsCount();
1627 newSize += round.getAbortsCount();
1629 if (newSize > ArbitrationRound.MAX_PARTS) {
1630 // Cant compact since it would be too large
1634 // Set the new compacted part
1635 lastRound.setCommit(newCommit);
1636 lastRound.addAborts(round.getAborts());
1637 gotNewCommit = true;
1643 if (numberToDelete != 1) {
1644 // If there is a compaction
1646 // Delete the previous pieces that are now in the new compacted piece
1647 if (numberToDelete == pendingSendArbitrationRounds.size()) {
1648 pendingSendArbitrationRounds.clear();
1650 for (int i = 0; i < numberToDelete; i++) {
1651 pendingSendArbitrationRounds.remove(pendingSendArbitrationRounds.size() - 1);
1655 // Add the new compacted into the pending to send list
1656 pendingSendArbitrationRounds.add(lastRound);
1658 // Should reinsert into the commit processor
1659 if (hadCommit && gotNewCommit) {
1668 * Update all the commits and the committed tables, sets dead the dead transactions
1670 private boolean updateCommittedTable() {
1672 if (newCommitParts.size() == 0) {
1673 // Nothing new to process
1677 // Iterate through all the machine Ids that we received new parts for
1678 for (Long machineId : newCommitParts.keySet()) {
1679 Map<Pair<Long, Integer>, CommitPart> parts = newCommitParts.get(machineId);
1681 // Iterate through all the parts for that machine Id
1682 for (Pair<Long, Integer> partId : parts.keySet()) {
1683 CommitPart part = parts.get(partId);
1685 // Get the transaction object for that sequence number
1686 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(part.getMachineId());
1688 if (commitForClientTable == null) {
1689 // This is the first commit from this device
1690 commitForClientTable = new HashMap<Long, Commit>();
1691 liveCommitsTable.put(part.getMachineId(), commitForClientTable);
1694 Commit commit = commitForClientTable.get(part.getSequenceNumber());
1696 if (commit == null) {
1697 // This is a new commit that we dont have so make a new one
1698 commit = new Commit();
1700 // Insert this new commit into the live tables
1701 commitForClientTable.put(part.getSequenceNumber(), commit);
1704 // Add that part to the commit
1705 commit.addPartDecode(part);
1709 // Clear all the new commits parts in preparation for the next time the server sends slots
1710 newCommitParts.clear();
1712 // If we process a new commit keep track of it for future use
1713 boolean didProcessANewCommit = false;
1715 // Process the commits one by one
1716 for (Long arbitratorId : liveCommitsTable.keySet()) {
1718 // Get all the commits for a specific arbitrator
1719 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(arbitratorId);
1721 // Sort the commits in order
1722 List<Long> commitSequenceNumbers = new ArrayList<Long>(commitForClientTable.keySet());
1723 Collections.sort(commitSequenceNumbers);
1725 // Go through each new commit one by one
1726 for (int i = 0; i < commitSequenceNumbers.size(); i++) {
1727 Long commitSequenceNumber = commitSequenceNumbers.get(i);
1728 Commit commit = commitForClientTable.get(commitSequenceNumber);
1730 // Special processing if a commit is not complete
1731 if (!commit.isComplete()) {
1732 if (i == (commitSequenceNumbers.size() - 1)) {
1733 // 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
1736 // This is a commit that was already dead but parts of it are still in the block chain (not flushed out yet).
1737 // Delete it and move on
1739 commitForClientTable.remove(commit.getSequenceNumber());
1744 // Get the last commit seen from this arbitrator
1745 long lastCommitSeenSequenceNumber = -1;
1746 if (lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId()) != null) {
1747 lastCommitSeenSequenceNumber = lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId());
1750 // Update the last arbitration data that we have seen so far
1751 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(commit.getMachineId()) != null) {
1753 long lastArbitrationSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(commit.getMachineId());
1754 if (commit.getSequenceNumber() > lastArbitrationSequenceNumber) {
1756 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(commit.getMachineId(), commit.getSequenceNumber());
1759 // Never seen any data from this arbitrator so record the first one
1760 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(commit.getMachineId(), commit.getSequenceNumber());
1763 // We have already seen this commit before so need to do the full processing on this commit
1764 if (commit.getSequenceNumber() <= lastCommitSeenSequenceNumber) {
1766 // Update the last transaction that was updated if we can
1767 if (commit.getTransactionSequenceNumber() != -1) {
1768 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(commit.getMachineId());
1770 // Update the last transaction sequence number that the arbitrator arbitrated on
1771 if ((lastTransactionNumber == null) || (lastTransactionNumber < commit.getTransactionSequenceNumber())) {
1772 lastArbitratedTransactionNumberByArbitratorTable.put(commit.getMachineId(), commit.getTransactionSequenceNumber());
1779 // If we got here then this is a brand new commit and needs full processing
1781 // Get what commits should be edited, these are the commits that have live values for their keys
1782 Set<Commit> commitsToEdit = new HashSet<Commit>();
1783 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
1784 commitsToEdit.add(liveCommitsByKeyTable.get(kv.getKey()));
1786 commitsToEdit.remove(null); // remove null since it could be in this set
1788 // Update each previous commit that needs to be updated
1789 for (Commit previousCommit : commitsToEdit) {
1791 // Only bother with live commits (TODO: Maybe remove this check)
1792 if (previousCommit.isLive()) {
1794 // Update which keys in the old commits are still live
1795 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
1796 previousCommit.invalidateKey(kv.getKey());
1799 // if the commit is now dead then remove it
1800 if (!previousCommit.isLive()) {
1801 commitForClientTable.remove(previousCommit);
1806 // Update the last seen sequence number from this arbitrator
1807 if (lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId()) != null) {
1808 if (commit.getSequenceNumber() > lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId())) {
1809 lastCommitSeenSequenceNumberByArbitratorTable.put(commit.getMachineId(), commit.getSequenceNumber());
1815 // Update the last transaction that was updated if we can
1816 if (commit.getTransactionSequenceNumber() != -1) {
1817 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(commit.getMachineId());
1819 // Update the last transaction sequence number that the arbitrator arbitrated on
1820 if ((lastTransactionNumber == null) || (lastTransactionNumber < commit.getTransactionSequenceNumber())) {
1821 lastArbitratedTransactionNumberByArbitratorTable.put(commit.getMachineId(), commit.getTransactionSequenceNumber());
1825 // We processed a new commit that we havent seen before
1826 didProcessANewCommit = true;
1830 System.out.println("============");
1831 // Update the committed table of keys and which commit is using which key
1832 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
1833 System.out.println("Committing: " + kv);
1834 committedKeyValueTable.put(kv.getKey(), kv);
1835 liveCommitsByKeyTable.put(kv.getKey(), commit);
1837 System.out.println("--------------");
1838 System.out.println();
1842 return didProcessANewCommit;
1846 * Create the speculative table from transactions that are still live and have come from the cloud
1848 private boolean updateSpeculativeTable(boolean didProcessNewCommits) {
1849 if (liveTransactionBySequenceNumberTable.keySet().size() == 0) {
1850 // There is nothing to speculate on
1854 // Create a list of the transaction sequence numbers and sort them from oldest to newest
1855 List<Long> transactionSequenceNumbersSorted = new ArrayList<Long>(liveTransactionBySequenceNumberTable.keySet());
1856 Collections.sort(transactionSequenceNumbersSorted);
1858 boolean hasGapInTransactionSequenceNumbers = transactionSequenceNumbersSorted.get(0) != oldestTransactionSequenceNumberSpeculatedOn;
1861 if (hasGapInTransactionSequenceNumbers || didProcessNewCommits) {
1862 // If there is a gap in the transaction sequence numbers then there was a commit or an abort of a transaction
1863 // OR there was a new commit (Could be from offline commit) so a redo the speculation from scratch
1865 // Start from scratch
1866 speculatedKeyValueTable.clear();
1867 lastTransactionSequenceNumberSpeculatedOn = -1;
1868 oldestTransactionSequenceNumberSpeculatedOn = -1;
1872 // Remember the front of the transaction list
1873 oldestTransactionSequenceNumberSpeculatedOn = transactionSequenceNumbersSorted.get(0);
1875 // Find where to start arbitration from
1876 int startIndex = transactionSequenceNumbersSorted.indexOf(lastTransactionSequenceNumberSpeculatedOn) + 1;
1878 if (startIndex >= transactionSequenceNumbersSorted.size()) {
1879 // Make sure we are not out of bounds
1880 return false; // did not speculate
1883 Set<Long> incompleteTransactionArbitrator = new HashSet<Long>();
1884 boolean didSkip = true;
1886 for (int i = startIndex; i < transactionSequenceNumbersSorted.size(); i++) {
1887 long transactionSequenceNumber = transactionSequenceNumbersSorted.get(i);
1888 Transaction transaction = liveTransactionBySequenceNumberTable.get(transactionSequenceNumber);
1890 if (!transaction.isComplete()) {
1891 // If there is an incomplete transaction then there is nothing we can do
1892 // add this transactions arbitrator to the list of arbitrators we should ignore
1893 incompleteTransactionArbitrator.add(transaction.getArbitrator());
1898 if (incompleteTransactionArbitrator.contains(transaction.getArbitrator())) {
1902 lastTransactionSequenceNumberSpeculatedOn = transactionSequenceNumber;
1904 if (transaction.evaluateGuard(committedKeyValueTable, speculatedKeyValueTable, null)) {
1905 // Guard evaluated to true so update the speculative table
1906 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1907 speculatedKeyValueTable.put(kv.getKey(), kv);
1913 // Since there was a skip we need to redo the speculation next time around
1914 lastTransactionSequenceNumberSpeculatedOn = -1;
1915 oldestTransactionSequenceNumberSpeculatedOn = -1;
1918 // We did some speculation
1923 * Create the pending transaction speculative table from transactions that are still in the pending transaction buffer
1925 private void updatePendingTransactionSpeculativeTable(boolean didProcessNewCommitsOrSpeculate) {
1926 if (pendingTransactionQueue.size() == 0) {
1927 // There is nothing to speculate on
1932 if (didProcessNewCommitsOrSpeculate || (firstPendingTransaction != pendingTransactionQueue.get(0))) {
1933 // need to reset on the pending speculation
1934 lastPendingTransactionSpeculatedOn = null;
1935 firstPendingTransaction = pendingTransactionQueue.get(0);
1936 pendingTransactionSpeculatedKeyValueTable.clear();
1939 // Find where to start arbitration from
1940 int startIndex = pendingTransactionQueue.indexOf(firstPendingTransaction) + 1;
1942 if (startIndex >= pendingTransactionQueue.size()) {
1943 // Make sure we are not out of bounds
1947 for (int i = startIndex; i < pendingTransactionQueue.size(); i++) {
1948 Transaction transaction = pendingTransactionQueue.get(i);
1950 lastPendingTransactionSpeculatedOn = transaction;
1952 if (transaction.evaluateGuard(committedKeyValueTable, speculatedKeyValueTable, pendingTransactionSpeculatedKeyValueTable)) {
1953 // Guard evaluated to true so update the speculative table
1954 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1955 pendingTransactionSpeculatedKeyValueTable.put(kv.getKey(), kv);
1962 * Set dead and remove from the live transaction tables the transactions that are dead
1964 private void updateLiveTransactionsAndStatus() {
1966 // Go through each of the transactions
1967 for (Iterator<Map.Entry<Long, Transaction>> iter = liveTransactionBySequenceNumberTable.entrySet().iterator(); iter.hasNext();) {
1968 Transaction transaction = iter.next().getValue();
1970 // Check if the transaction is dead
1971 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(transaction.getArbitrator());
1972 if ((lastTransactionNumber != null) && (lastTransactionNumber >= transaction.getSequenceNumber())) {
1974 // Set dead the transaction
1975 transaction.setDead();
1977 // Remove the transaction from the live table
1979 liveTransactionByTransactionIdTable.remove(transaction.getId());
1983 // Go through each of the transactions
1984 for (Iterator<Map.Entry<Long, TransactionStatus>> iter = outstandingTransactionStatus.entrySet().iterator(); iter.hasNext();) {
1985 TransactionStatus status = iter.next().getValue();
1987 // Check if the transaction is dead
1988 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(status.getTransactionArbitrator());
1989 if ((lastTransactionNumber != null) && (lastTransactionNumber >= status.getTransactionSequenceNumber())) {
1992 status.setStatus(TransactionStatus.StatusCommitted);
2001 * Process this slot, entry by entry. Also update the latest message sent by slot
2003 private void processSlot(SlotIndexer indexer, Slot slot, boolean acceptUpdatesToLocal, HashSet<Long> machineSet) {
2005 // Update the last message seen
2006 updateLastMessage(slot.getMachineID(), slot.getSequenceNumber(), slot, acceptUpdatesToLocal, machineSet);
2008 // Process each entry in the slot
2009 for (Entry entry : slot.getEntries()) {
2010 switch (entry.getType()) {
2012 case Entry.TypeCommitPart:
2013 processEntry((CommitPart)entry);
2016 case Entry.TypeAbort:
2017 processEntry((Abort)entry);
2020 case Entry.TypeTransactionPart:
2021 processEntry((TransactionPart)entry);
2024 case Entry.TypeNewKey:
2025 processEntry((NewKey)entry);
2028 case Entry.TypeLastMessage:
2029 processEntry((LastMessage)entry, machineSet);
2032 case Entry.TypeRejectedMessage:
2033 processEntry((RejectedMessage)entry, indexer);
2036 case Entry.TypeTableStatus:
2037 processEntry((TableStatus)entry);
2041 throw new Error("Unrecognized type: " + entry.getType());
2047 * Update the last message that was sent for a machine Id
2049 private void processEntry(LastMessage entry, HashSet<Long> machineSet) {
2050 // Update what the last message received by a machine was
2051 updateLastMessage(entry.getMachineID(), entry.getSequenceNumber(), entry, false, machineSet);
2055 * Add the new key to the arbitrators table and update the set of live new keys (in case of a rescued new key message)
2057 private void processEntry(NewKey entry) {
2059 // Update the arbitrator table with the new key information
2060 arbitratorTable.put(entry.getKey(), entry.getMachineID());
2062 // Update what the latest live new key is
2063 NewKey oldNewKey = liveNewKeyTable.put(entry.getKey(), entry);
2064 if (oldNewKey != null) {
2065 // Delete the old new key messages
2066 oldNewKey.setDead();
2071 * Process new table status entries and set dead the old ones as new ones come in.
2072 * keeps track of the largest and smallest table status seen in this current round
2073 * of updating the local copy of the block chain
2075 private void processEntry(TableStatus entry) {
2076 int newNumSlots = entry.getMaxSlots();
2078 if (liveTableStatus != null) {
2079 // We have a larger table status so the old table status is no longer alive
2080 liveTableStatus.setDead();
2083 // Make this new table status the latest alive table status
2084 liveTableStatus = entry;
2086 if ((smallestTableStatusSeen == -1) || (newNumSlots < smallestTableStatusSeen)) {
2087 smallestTableStatusSeen = newNumSlots;
2090 if ((largestTableStatusSeen == -1) || (newNumSlots > largestTableStatusSeen)) {
2091 largestTableStatusSeen = newNumSlots;
2096 * Check old messages to see if there is a block chain violation. Also
2098 private void processEntry(RejectedMessage entry, SlotIndexer indexer) {
2099 long oldSeqNum = entry.getOldSeqNum();
2100 long newSeqNum = entry.getNewSeqNum();
2101 boolean isequal = entry.getEqual();
2102 long machineId = entry.getMachineID();
2105 // Check if we have messages that were supposed to be rejected in our local block chain
2106 for (long seqNum = oldSeqNum; seqNum <= newSeqNum; seqNum++) {
2109 Slot slot = indexer.getSlot(seqNum);
2112 // If we have this slot make sure that it was not supposed to be a rejected slot
2114 long slotMachineId = slot.getMachineID();
2115 if (isequal != (slotMachineId == machineId)) {
2116 throw new Error("Server Error: Trying to insert rejected message for slot " + seqNum);
2122 // Create a list of clients to watch until they see this rejected message entry.
2123 HashSet<Long> deviceWatchSet = new HashSet<Long>();
2124 for (Map.Entry<Long, Pair<Long, Liveness>> lastMessageEntry : lastMessageTable.entrySet()) {
2126 // Machine ID for the last message entry
2127 long lastMessageEntryMachineId = lastMessageEntry.getKey();
2129 // We've seen it, don't need to continue to watch. Our next
2130 // message will implicitly acknowledge it.
2131 if (lastMessageEntryMachineId == localMachineId) {
2135 Pair<Long, Liveness> lastMessageValue = lastMessageEntry.getValue();
2136 long entrySequenceNumber = lastMessageValue.getFirst();
2138 if (entrySequenceNumber < newSeqNum) {
2140 // Add this rejected message to the set of messages that this machine ID did not see yet
2141 addWatchList(lastMessageEntryMachineId, entry);
2143 // This client did not see this rejected message yet so add it to the watch set to monitor
2144 deviceWatchSet.add(lastMessageEntryMachineId);
2148 if (deviceWatchSet.isEmpty()) {
2149 // This rejected message has been seen by all the clients so
2152 // We need to watch this rejected message
2153 entry.setWatchSet(deviceWatchSet);
2158 * Check if this abort is live, if not then save it so we can kill it later.
2159 * update the last transaction number that was arbitrated on.
2161 private void processEntry(Abort entry) {
2163 // Abort has not been seen by the client it is for yet so we need to keep track of it
2164 Abort previouslySeenAbort = liveAbortTable.put(entry.getAbortId(), entry);
2165 if (previouslySeenAbort != null) {
2166 previouslySeenAbort.setDead(); // Delete old version of the abort since we got a rescued newer version
2169 if (entry.getTransactionArbitrator() == localMachineId) {
2170 liveAbortsGeneratedByLocal.put(entry.getArbitratorLocalSequenceNumber(), entry);
2173 if ((entry.getSequenceNumber() != -1) && (lastMessageTable.get(entry.getTransactionMachineId()).getFirst() >= entry.getSequenceNumber())) {
2175 // The machine already saw this so it is dead
2177 liveAbortTable.remove(entry.getAbortId());
2179 if (entry.getTransactionArbitrator() == localMachineId) {
2180 liveAbortsGeneratedByLocal.remove(entry.getArbitratorLocalSequenceNumber());
2187 if (entry.getTransactionSequenceNumber() != -1) {
2188 // update the transaction status if it was sent to the server
2189 TransactionStatus status = outstandingTransactionStatus.remove(entry.getTransactionSequenceNumber());
2190 if (status != null) {
2191 status.setStatus(TransactionStatus.StatusAborted);
2195 // Update the last arbitration data that we have seen so far
2196 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(entry.getTransactionArbitrator()) != null) {
2198 long lastArbitrationSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(entry.getTransactionArbitrator());
2199 if (entry.getSequenceNumber() > lastArbitrationSequenceNumber) {
2201 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(entry.getTransactionArbitrator(), entry.getSequenceNumber());
2205 // Never seen any data from this arbitrator so record the first one
2206 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(entry.getTransactionArbitrator(), entry.getSequenceNumber());
2210 // Set dead a transaction if we can
2211 Transaction transactionToSetDead = liveTransactionByTransactionIdTable.remove(new Pair<Long, Long>(entry.getTransactionMachineId(), entry.getTransactionClientLocalSequenceNumber()));
2212 if (transactionToSetDead != null) {
2213 liveTransactionBySequenceNumberTable.remove(transactionToSetDead.getSequenceNumber());
2216 // Update the last transaction sequence number that the arbitrator arbitrated on
2217 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(entry.getTransactionArbitrator());
2218 if ((lastTransactionNumber == null) || (lastTransactionNumber < entry.getTransactionSequenceNumber())) {
2221 if (entry.getTransactionSequenceNumber() != -1) {
2222 lastArbitratedTransactionNumberByArbitratorTable.put(entry.getTransactionArbitrator(), entry.getTransactionSequenceNumber());
2228 * Set dead the transaction part if that transaction is dead and keep track of all new parts
2230 private void processEntry(TransactionPart entry) {
2231 // Check if we have already seen this transaction and set it dead OR if it is not alive
2232 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(entry.getArbitratorId());
2233 if ((lastTransactionNumber != null) && (lastTransactionNumber >= entry.getSequenceNumber())) {
2234 // This transaction is dead, it was already committed or aborted
2239 // This part is still alive
2240 Map<Pair<Long, Integer>, TransactionPart> transactionPart = newTransactionParts.get(entry.getMachineId());
2242 if (transactionPart == null) {
2243 // Dont have a table for this machine Id yet so make one
2244 transactionPart = new HashMap<Pair<Long, Integer>, TransactionPart>();
2245 newTransactionParts.put(entry.getMachineId(), transactionPart);
2248 // Update the part and set dead ones we have already seen (got a rescued version)
2249 TransactionPart previouslySeenPart = transactionPart.put(entry.getPartId(), entry);
2250 if (previouslySeenPart != null) {
2251 previouslySeenPart.setDead();
2256 * Process new commit entries and save them for future use. Delete duplicates
2258 private void processEntry(CommitPart entry) {
2259 Map<Pair<Long, Integer>, CommitPart> commitPart = newCommitParts.get(entry.getMachineId());
2261 if (commitPart == null) {
2262 // Don't have a table for this machine Id yet so make one
2263 commitPart = new HashMap<Pair<Long, Integer>, CommitPart>();
2264 newCommitParts.put(entry.getMachineId(), commitPart);
2267 // Update the part and set dead ones we have already seen (got a rescued version)
2268 CommitPart previouslySeenPart = commitPart.put(entry.getPartId(), entry);
2269 if (previouslySeenPart != null) {
2270 previouslySeenPart.setDead();
2275 * Update the last message seen table. Update and set dead the appropriate RejectedMessages as clients see them.
2276 * Updates the live aborts, removes those that are dead and sets them dead.
2277 * Check that the last message seen is correct and that there is no mismatch of our own last message or that
2278 * other clients have not had a rollback on the last message.
2280 private void updateLastMessage(long machineId, long seqNum, Liveness liveness, boolean acceptUpdatesToLocal, HashSet<Long> machineSet) {
2282 // We have seen this machine ID
2283 machineSet.remove(machineId);
2285 // Get the set of rejected messages that this machine Id is has not seen yet
2286 HashSet<RejectedMessage> watchset = rejectedMessageWatchListTable.get(machineId);
2288 // If there is a rejected message that this machine Id has not seen yet
2289 if (watchset != null) {
2291 // Go through each rejected message that this machine Id has not seen yet
2292 for (Iterator<RejectedMessage> rmit = watchset.iterator(); rmit.hasNext(); ) {
2294 RejectedMessage rm = rmit.next();
2296 // If this machine Id has seen this rejected message...
2297 if (rm.getNewSeqNum() <= seqNum) {
2299 // Remove it from our watchlist
2302 // Decrement machines that need to see this notification
2303 rm.removeWatcher(machineId);
2308 // Set dead the abort
2309 for (Iterator<Map.Entry<Pair<Long, Long>, Abort>> i = liveAbortTable.entrySet().iterator(); i.hasNext();) {
2310 Abort abort = i.next().getValue();
2312 if ((abort.getTransactionMachineId() == machineId) && (abort.getSequenceNumber() <= seqNum)) {
2316 if (abort.getTransactionArbitrator() == localMachineId) {
2317 liveAbortsGeneratedByLocal.remove(abort.getArbitratorLocalSequenceNumber());
2324 if (machineId == localMachineId) {
2325 // Our own messages are immediately dead.
2326 if (liveness instanceof LastMessage) {
2327 ((LastMessage)liveness).setDead();
2328 } else if (liveness instanceof Slot) {
2329 ((Slot)liveness).setDead();
2331 throw new Error("Unrecognized type");
2335 // Get the old last message for this device
2336 Pair<Long, Liveness> lastMessageEntry = lastMessageTable.put(machineId, new Pair<Long, Liveness>(seqNum, liveness));
2337 if (lastMessageEntry == null) {
2338 // If no last message then there is nothing else to process
2342 long lastMessageSeqNum = lastMessageEntry.getFirst();
2343 Liveness lastEntry = lastMessageEntry.getSecond();
2345 // If it is not our machine Id since we already set ours to dead
2346 if (machineId != localMachineId) {
2347 if (lastEntry instanceof LastMessage) {
2348 ((LastMessage)lastEntry).setDead();
2349 } else if (lastEntry instanceof Slot) {
2350 ((Slot)lastEntry).setDead();
2352 throw new Error("Unrecognized type");
2356 // Make sure the server is not playing any games
2357 if (machineId == localMachineId) {
2359 if (hadPartialSendToServer) {
2360 // We were not making any updates and we had a machine mismatch
2361 if (lastMessageSeqNum > seqNum && !acceptUpdatesToLocal) {
2362 throw new Error("Server Error: Mismatch on local machine sequence number, needed at least: " + lastMessageSeqNum + " got: " + seqNum);
2366 // We were not making any updates and we had a machine mismatch
2367 if (lastMessageSeqNum != seqNum && !acceptUpdatesToLocal) {
2368 throw new Error("Server Error: Mismatch on local machine sequence number, needed: " + lastMessageSeqNum + " got: " + seqNum);
2372 if (lastMessageSeqNum > seqNum) {
2373 throw new Error("Server Error: Rollback on remote machine sequence number");
2379 * Add a rejected message entry to the watch set to keep track of which clients have seen that
2380 * rejected message entry and which have not.
2382 private void addWatchList(long machineId, RejectedMessage entry) {
2383 HashSet<RejectedMessage> entries = rejectedMessageWatchListTable.get(machineId);
2384 if (entries == null) {
2385 // There is no set for this machine ID yet so create one
2386 entries = new HashSet<RejectedMessage>();
2387 rejectedMessageWatchListTable.put(machineId, entries);
2393 * Check if the HMAC chain is not violated
2395 private void checkHMACChain(SlotIndexer indexer, Slot[] newSlots) {
2396 for (int i = 0; i < newSlots.length; i++) {
2397 Slot currSlot = newSlots[i];
2398 Slot prevSlot = indexer.getSlot(currSlot.getSequenceNumber() - 1);
2399 if (prevSlot != null &&
2400 !Arrays.equals(prevSlot.getHMAC(), currSlot.getPrevHMAC()))
2401 throw new Error("Server Error: Invalid HMAC Chain" + currSlot + " " + prevSlot);