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.initSecurity();
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 updateLiveStateFromLocal();
478 return transactionStatus;
482 * Get the machine ID for this client
484 public long getMachineId() {
485 return localMachineId;
489 * Decrement the number of live slots that we currently have
491 public void decrementLiveCount() {
496 * Recalculate the new resize threshold
498 private void setResizeThreshold() {
499 int resizeLower = (int) (RESIZE_THRESHOLD * numberOfSlots);
500 bufferResizeThreshold = resizeLower - 1 + random.nextInt(numberOfSlots - resizeLower);
503 private boolean sendToServer(NewKey newKey) throws ServerException {
506 // While we have stuff that needs inserting into the block chain
507 while ((pendingTransactionQueue.size() > 0) || (pendingSendArbitrationRounds.size() > 0) || (newKey != null)) {
510 Slot slot = new Slot(this, sequenceNumber + 1, localMachineId, buffer.getSlot(sequenceNumber).getHMAC());
512 // Try to fill the slot with data
513 ThreeTuple<Boolean, Integer, Boolean> fillSlotsReturn = fillSlot(slot, false, newKey);
514 boolean needsResize = fillSlotsReturn.getFirst();
515 int newSize = fillSlotsReturn.getSecond();
516 Boolean insertedNewKey = fillSlotsReturn.getThird();
519 // Reset which transaction to send
520 for (Transaction transaction : transactionPartsSent.keySet()) {
521 transaction.resetNextPartToSend();
523 // Set the transaction sequence number back to nothing
524 if (!transaction.didSendAPartToServer()) {
525 transaction.setSequenceNumber(-1);
529 // Clear the sent data since we are trying again
530 pendingSendArbitrationEntriesToDelete.clear();
531 transactionPartsSent.clear();
533 // We needed a resize so try again
534 fillSlot(slot, true, newKey);
537 // Try to send to the server
538 ThreeTuple<Boolean, Boolean, Slot[]> sendSlotsReturn = sendSlotsToServer(slot, newSize, newKey != null);
540 if (/*sendSlotsReturn.getSecond() || */sendSlotsReturn.getFirst()) {
541 // Did insert into the block chain
543 if (sendSlotsReturn.getFirst()) {
544 // This slot was what was inserted not a previous slot
546 // New Key was successfully inserted into the block chain so dont want to insert it again
550 // Remove the aborts and commit parts that were sent from the pending to send queue
551 for (Iterator<ArbitrationRound> iter = pendingSendArbitrationRounds.iterator(); iter.hasNext(); ) {
552 ArbitrationRound round = iter.next();
553 round.removeParts(pendingSendArbitrationEntriesToDelete);
555 if (round.isDoneSending()) {
556 // Sent all the parts
561 for (Transaction transaction : transactionPartsSent.keySet()) {
564 transaction.resetServerFailure();
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();
586 transaction.resetNextPartToSend();
588 // Set the transaction sequence number back to nothing
589 if (!transaction.didSendAPartToServer()) {
590 transaction.setSequenceNumber(-1);
595 // Clear the sent data in preparation for next send
596 pendingSendArbitrationEntriesToDelete.clear();
597 transactionPartsSent.clear();
599 if (sendSlotsReturn.getThird().length != 0) {
600 // insert into the local block chain
601 validateAndUpdate(sendSlotsReturn.getThird(), true);
604 } catch (ServerException e) {
606 System.out.println("Server Failure: " + e.getType());
609 if (e.getType() != ServerException.TypeInputTimeout) {
610 // e.printStackTrace();
612 // Nothing was able to be sent to the server so just clear these data structures
613 for (Transaction transaction : transactionPartsSent.keySet()) {
614 transaction.resetNextPartToSend();
616 // Set the transaction sequence number back to nothing
617 if (!transaction.didSendAPartToServer()) {
618 transaction.setSequenceNumber(-1);
622 // There was a partial send to the server
623 hadPartialSendToServer = true;
625 // Nothing was able to be sent to the server so just clear these data structures
626 for (Transaction transaction : transactionPartsSent.keySet()) {
627 transaction.resetNextPartToSend();
628 transaction.setServerFailure();
632 pendingSendArbitrationEntriesToDelete.clear();
633 transactionPartsSent.clear();
638 return newKey == null;
641 public synchronized boolean updateFromLocal(long machineId) {
642 Pair<String, Integer> localCommunicationInformation = localCommunicationTable.get(machineId);
643 if (localCommunicationInformation == null) {
644 // Cant talk to that device locally so do nothing
648 // Get the size of the send data
649 int sendDataSize = Integer.BYTES + Long.BYTES;
651 Long lastArbitrationDataLocalSequenceNumber = (long) - 1;
652 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(machineId) != null) {
653 lastArbitrationDataLocalSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(machineId);
656 byte[] sendData = new byte[sendDataSize];
657 ByteBuffer bbEncode = ByteBuffer.wrap(sendData);
660 bbEncode.putLong(lastArbitrationDataLocalSequenceNumber);
664 byte[] returnData = cloud.sendLocalData(sendData, localCommunicationInformation.getFirst(), localCommunicationInformation.getSecond());
666 if (returnData == null) {
667 // Could not contact server
672 ByteBuffer bbDecode = ByteBuffer.wrap(returnData);
673 int numberOfEntries = bbDecode.getInt();
675 for (int i = 0; i < numberOfEntries; i++) {
676 byte type = bbDecode.get();
677 if (type == Entry.TypeAbort) {
678 Abort abort = (Abort)Abort.decode(null, bbDecode);
680 } else if (type == Entry.TypeCommitPart) {
681 CommitPart commitPart = (CommitPart)CommitPart.decode(null, bbDecode);
682 processEntry(commitPart);
686 updateLiveStateFromLocal();
691 private Pair<Boolean, Boolean> sendTransactionToLocal(Transaction transaction) {
693 // Get the devices local communications
694 Pair<String, Integer> localCommunicationInformation = localCommunicationTable.get(transaction.getArbitrator());
696 if (localCommunicationInformation == null) {
697 // Cant talk to that device locally so do nothing
698 return new Pair<Boolean, Boolean>(false, false);
701 // Get the size of the send data
702 int sendDataSize = Integer.BYTES + Long.BYTES;
703 for (TransactionPart part : transaction.getParts().values()) {
704 sendDataSize += part.getSize();
707 Long lastArbitrationDataLocalSequenceNumber = (long) - 1;
708 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(transaction.getArbitrator()) != null) {
709 lastArbitrationDataLocalSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(transaction.getArbitrator());
712 // Make the send data size
713 byte[] sendData = new byte[sendDataSize];
714 ByteBuffer bbEncode = ByteBuffer.wrap(sendData);
717 bbEncode.putLong(lastArbitrationDataLocalSequenceNumber);
718 bbEncode.putInt(transaction.getParts().size());
719 for (TransactionPart part : transaction.getParts().values()) {
720 part.encode(bbEncode);
724 byte[] returnData = cloud.sendLocalData(sendData, localCommunicationInformation.getFirst(), localCommunicationInformation.getSecond());
726 if (returnData == null) {
727 // Could not contact server
728 return new Pair<Boolean, Boolean>(true, false);
732 ByteBuffer bbDecode = ByteBuffer.wrap(returnData);
733 boolean didCommit = bbDecode.get() == 1;
734 boolean couldArbitrate = bbDecode.get() == 1;
735 int numberOfEntries = bbDecode.getInt();
736 boolean foundAbort = false;
738 for (int i = 0; i < numberOfEntries; i++) {
739 byte type = bbDecode.get();
740 if (type == Entry.TypeAbort) {
741 Abort abort = (Abort)Abort.decode(null, bbDecode);
743 if ((abort.getTransactionMachineId() == localMachineId) && (abort.getTransactionClientLocalSequenceNumber() == transaction.getClientLocalSequenceNumber())) {
748 } else if (type == Entry.TypeCommitPart) {
749 CommitPart commitPart = (CommitPart)CommitPart.decode(null, bbDecode);
750 processEntry(commitPart);
754 updateLiveStateFromLocal();
756 if (couldArbitrate) {
757 TransactionStatus status = transaction.getTransactionStatus();
759 status.setStatus(TransactionStatus.StatusCommitted);
761 status.setStatus(TransactionStatus.StatusAborted);
764 TransactionStatus status = transaction.getTransactionStatus();
766 status.setStatus(TransactionStatus.StatusAborted);
768 status.setStatus(TransactionStatus.StatusCommitted);
772 return new Pair<Boolean, Boolean>(false, true);
775 public synchronized byte[] acceptDataFromLocal(byte[] data) {
777 ByteBuffer bbDecode = ByteBuffer.wrap(data);
778 long lastArbitratedSequenceNumberSeen = bbDecode.getLong();
779 int numberOfParts = bbDecode.getInt();
781 // If we did commit a transaction or not
782 boolean didCommit = false;
783 boolean couldArbitrate = false;
785 if (numberOfParts != 0) {
787 // decode the transaction
788 Transaction transaction = new Transaction();
789 for (int i = 0; i < numberOfParts; i++) {
791 TransactionPart newPart = (TransactionPart)TransactionPart.decode(null, bbDecode);
792 transaction.addPartDecode(newPart);
795 // Arbitrate on transaction and pull relevant return data
796 Pair<Boolean, Boolean> localArbitrateReturn = arbitrateOnLocalTransaction(transaction);
797 couldArbitrate = localArbitrateReturn.getFirst();
798 didCommit = localArbitrateReturn.getSecond();
800 updateLiveStateFromLocal();
802 // Transaction was sent to the server so keep track of it to prevent double commit
803 if (transaction.getSequenceNumber() != -1) {
804 offlineTransactionsCommittedAndAtServer.add(transaction.getId());
808 // The data to send back
809 int returnDataSize = 0;
810 List<Entry> unseenArbitrations = new ArrayList<Entry>();
812 // Get the aborts to send back
813 List<Long> abortLocalSequenceNumbers = new ArrayList<Long >(liveAbortsGeneratedByLocal.keySet());
814 Collections.sort(abortLocalSequenceNumbers);
815 for (Long localSequenceNumber : abortLocalSequenceNumbers) {
816 if (localSequenceNumber <= lastArbitratedSequenceNumberSeen) {
820 Abort abort = liveAbortsGeneratedByLocal.get(localSequenceNumber);
821 unseenArbitrations.add(abort);
822 returnDataSize += abort.getSize();
825 // Get the commits to send back
826 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(localMachineId);
827 if (commitForClientTable != null) {
828 List<Long> commitLocalSequenceNumbers = new ArrayList<Long>(commitForClientTable.keySet());
829 Collections.sort(commitLocalSequenceNumbers);
831 for (Long localSequenceNumber : commitLocalSequenceNumbers) {
832 Commit commit = commitForClientTable.get(localSequenceNumber);
834 if (localSequenceNumber <= lastArbitratedSequenceNumberSeen) {
838 unseenArbitrations.addAll(commit.getParts().values());
840 for (CommitPart commitPart : commit.getParts().values()) {
841 returnDataSize += commitPart.getSize();
846 // Number of arbitration entries to decode
847 returnDataSize += 2 * Integer.BYTES;
849 // Boolean of did commit or not
850 if (numberOfParts != 0) {
851 returnDataSize += Byte.BYTES;
855 byte[] returnData = new byte[returnDataSize];
856 ByteBuffer bbEncode = ByteBuffer.wrap(returnData);
858 if (numberOfParts != 0) {
860 bbEncode.put((byte)1);
862 bbEncode.put((byte)0);
864 if (couldArbitrate) {
865 bbEncode.put((byte)1);
867 bbEncode.put((byte)0);
871 bbEncode.putInt(unseenArbitrations.size());
872 for (Entry entry : unseenArbitrations) {
873 entry.encode(bbEncode);
879 private ThreeTuple<Boolean, Boolean, Slot[]> sendSlotsToServer(Slot slot, int newSize, boolean isNewKey) throws ServerException {
881 boolean attemptedToSendToServerTmp = attemptedToSendToServer;
882 attemptedToSendToServer = true;
884 boolean inserted = false;
885 boolean lastTryInserted = false;
887 Slot[] array = cloud.putSlot(slot, newSize);
889 array = new Slot[] {slot};
890 rejectedSlotList.clear();
893 if (array.length == 0) {
894 throw new Error("Server Error: Did not send any slots");
897 // if (attemptedToSendToServerTmp) {
898 if (hadPartialSendToServer) {
900 boolean isInserted = false;
901 for (Slot s : array) {
902 if ((s.getSequenceNumber() == slot.getSequenceNumber()) && (s.getMachineID() == localMachineId)) {
908 for (Slot s : array) {
913 // Process each entry in the slot
914 for (Entry entry : s.getEntries()) {
916 if (entry.getType() == Entry.TypeLastMessage) {
917 LastMessage lastMessage = (LastMessage)entry;
919 if ((lastMessage.getMachineID() == localMachineId) && (lastMessage.getSequenceNumber() == slot.getSequenceNumber())) {
928 rejectedSlotList.add(slot.getSequenceNumber());
929 lastTryInserted = false;
931 lastTryInserted = true;
934 rejectedSlotList.add(slot.getSequenceNumber());
935 lastTryInserted = false;
939 return new ThreeTuple<Boolean, Boolean, Slot[]>(inserted, lastTryInserted, array);
943 * Returns false if a resize was needed
945 private ThreeTuple<Boolean, Integer, Boolean> fillSlot(Slot slot, boolean resize, NewKey newKeyEntry) {
947 if (liveSlotCount > bufferResizeThreshold) {
948 resize = true; //Resize is forced
952 newSize = (int) (numberOfSlots * RESIZE_MULTIPLE);
953 TableStatus status = new TableStatus(slot, newSize);
954 slot.addEntry(status);
957 // Fill with rejected slots first before doing anything else
958 doRejectedMessages(slot);
960 // Do mandatory rescue of entries
961 ThreeTuple<Boolean, Boolean, Long> mandatoryRescueReturn = doMandatoryResuce(slot, resize);
963 // Extract working variables
964 boolean needsResize = mandatoryRescueReturn.getFirst();
965 boolean seenLiveSlot = mandatoryRescueReturn.getSecond();
966 long currentRescueSequenceNumber = mandatoryRescueReturn.getThird();
968 if (needsResize && !resize) {
969 // We need to resize but we are not resizing so return false
970 return new ThreeTuple<Boolean, Integer, Boolean>(true, null, null);
973 boolean inserted = false;
974 if (newKeyEntry != null) {
975 newKeyEntry.setSlot(slot);
976 if (slot.hasSpace(newKeyEntry)) {
977 slot.addEntry(newKeyEntry);
982 // Clear the transactions, aborts and commits that were sent previously
983 transactionPartsSent.clear();
984 pendingSendArbitrationEntriesToDelete.clear();
986 for (ArbitrationRound round : pendingSendArbitrationRounds) {
987 boolean isFull = false;
988 round.generateParts();
989 List<Entry> parts = round.getParts();
991 // Insert pending arbitration data
992 for (Entry arbitrationData : parts) {
994 // If it is an abort then we need to set some information
995 if (arbitrationData instanceof Abort) {
996 ((Abort)arbitrationData).setSequenceNumber(slot.getSequenceNumber());
999 if (!slot.hasSpace(arbitrationData)) {
1000 // No space so cant do anything else with these data entries
1005 // Add to this current slot and add it to entries to delete
1006 slot.addEntry(arbitrationData);
1007 pendingSendArbitrationEntriesToDelete.add(arbitrationData);
1015 if (pendingTransactionQueue.size() > 0) {
1017 Transaction transaction = pendingTransactionQueue.get(0);
1019 // Set the transaction sequence number if it has yet to be inserted into the block chain
1020 if ((!transaction.didSendAPartToServer() && !transaction.getServerFailure()) || (transaction.getSequenceNumber() == -1)) {
1021 transaction.setSequenceNumber(slot.getSequenceNumber());
1025 TransactionPart part = transaction.getNextPartToSend();
1028 // Ran out of parts to send for this transaction so move on
1032 if (slot.hasSpace(part)) {
1033 slot.addEntry(part);
1034 List<Integer> partsSent = transactionPartsSent.get(transaction);
1035 if (partsSent == null) {
1036 partsSent = new ArrayList<Integer>();
1037 transactionPartsSent.put(transaction, partsSent);
1039 partsSent.add(part.getPartNumber());
1040 transactionPartsSent.put(transaction, partsSent);
1048 // // Insert as many transactions as possible while keeping order
1049 // for (Transaction transaction : pendingTransactionQueue) {
1051 // // Set the transaction sequence number if it has yet to be inserted into the block chain
1052 // if (!transaction.didSendAPartToServer()) {
1053 // transaction.setSequenceNumber(slot.getSequenceNumber());
1056 // boolean ranOutOfSpace = false;
1059 // TransactionPart part = transaction.getNextPartToSend();
1061 // if (part == null) {
1062 // // Ran out of parts to send for this transaction so move on
1066 // if (slot.hasSpace(part)) {
1067 // slot.addEntry(part);
1068 // List<Integer> partsSent = transactionPartsSent.get(transaction);
1069 // if (partsSent == null) {
1070 // partsSent = new ArrayList<Integer>();
1071 // transactionPartsSent.put(transaction, partsSent);
1073 // partsSent.add(part.getPartNumber());
1074 // transactionPartsSent.put(transaction, partsSent);
1076 // for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1077 // System.out.println("Inserted Into Slot: " + kv);
1080 // ranOutOfSpace = true;
1084 // ranOutOfSpace = true;
1089 // if (ranOutOfSpace) {
1094 // Fill the remainder of the slot with rescue data
1095 doOptionalRescue(slot, seenLiveSlot, currentRescueSequenceNumber, resize);
1097 return new ThreeTuple<Boolean, Integer, Boolean>(false, newSize, inserted);
1100 private void doRejectedMessages(Slot s) {
1101 if (! rejectedSlotList.isEmpty()) {
1102 /* TODO: We should avoid generating a rejected message entry if
1103 * there is already a sufficient entry in the queue (e.g.,
1104 * equalsto value of true and same sequence number). */
1106 long old_seqn = rejectedSlotList.firstElement();
1107 if (rejectedSlotList.size() > REJECTED_THRESHOLD) {
1108 long new_seqn = rejectedSlotList.lastElement();
1109 RejectedMessage rm = new RejectedMessage(s, localMachineId, old_seqn, new_seqn, false);
1112 long prev_seqn = -1;
1114 /* Go through list of missing messages */
1115 for (; i < rejectedSlotList.size(); i++) {
1116 long curr_seqn = rejectedSlotList.get(i);
1117 Slot s_msg = buffer.getSlot(curr_seqn);
1120 prev_seqn = curr_seqn;
1122 /* Generate rejected message entry for missing messages */
1123 if (prev_seqn != -1) {
1124 RejectedMessage rm = new RejectedMessage(s, localMachineId, old_seqn, prev_seqn, false);
1127 /* Generate rejected message entries for present messages */
1128 for (; i < rejectedSlotList.size(); i++) {
1129 long curr_seqn = rejectedSlotList.get(i);
1130 Slot s_msg = buffer.getSlot(curr_seqn);
1131 long machineid = s_msg.getMachineID();
1132 RejectedMessage rm = new RejectedMessage(s, machineid, curr_seqn, curr_seqn, true);
1139 private ThreeTuple<Boolean, Boolean, Long> doMandatoryResuce(Slot slot, boolean resize) {
1140 long newestSequenceNumber = buffer.getNewestSeqNum();
1141 long oldestSequenceNumber = buffer.getOldestSeqNum();
1142 if (oldestLiveSlotSequenceNumver < oldestSequenceNumber) {
1143 oldestLiveSlotSequenceNumver = oldestSequenceNumber;
1146 long currentSequenceNumber = oldestLiveSlotSequenceNumver;
1147 boolean seenLiveSlot = false;
1148 long firstIfFull = newestSequenceNumber + 1 - numberOfSlots; // smallest seq number in the buffer if it is full
1149 long threshold = firstIfFull + FREE_SLOTS; // we want the buffer to be clear of live entries up to this point
1153 for (; currentSequenceNumber < threshold; currentSequenceNumber++) {
1154 Slot previousSlot = buffer.getSlot(currentSequenceNumber);
1155 // Push slot number forward
1156 if (! seenLiveSlot) {
1157 oldestLiveSlotSequenceNumver = currentSequenceNumber;
1160 if (!previousSlot.isLive()) {
1164 // We have seen a live slot
1165 seenLiveSlot = true;
1167 // Get all the live entries for a slot
1168 Vector<Entry> liveEntries = previousSlot.getLiveEntries(resize);
1170 // Iterate over all the live entries and try to rescue them
1171 for (Entry liveEntry : liveEntries) {
1172 if (slot.hasSpace(liveEntry)) {
1174 // Enough space to rescue the entry
1175 slot.addEntry(liveEntry);
1176 } else if (currentSequenceNumber == firstIfFull) {
1177 //if there's no space but the entry is about to fall off the queue
1178 System.out.println("B"); //?
1179 return new ThreeTuple<Boolean, Boolean, Long>(true, seenLiveSlot, currentSequenceNumber);
1186 return new ThreeTuple<Boolean, Boolean, Long>(false, seenLiveSlot, currentSequenceNumber);
1189 private void doOptionalRescue(Slot s, boolean seenliveslot, long seqn, boolean resize) {
1190 /* now go through live entries from least to greatest sequence number until
1191 * either all live slots added, or the slot doesn't have enough room
1192 * for SKIP_THRESHOLD consecutive entries*/
1194 long newestseqnum = buffer.getNewestSeqNum();
1196 for (; seqn <= newestseqnum; seqn++) {
1197 Slot prevslot = buffer.getSlot(seqn);
1198 //Push slot number forward
1200 oldestLiveSlotSequenceNumver = seqn;
1202 if (!prevslot.isLive())
1204 seenliveslot = true;
1205 Vector<Entry> liveentries = prevslot.getLiveEntries(resize);
1206 for (Entry liveentry : liveentries) {
1207 if (s.hasSpace(liveentry))
1208 s.addEntry(liveentry);
1211 if (skipcount > SKIP_THRESHOLD)
1219 * Checks for malicious activity and updates the local copy of the block chain.
1221 private void validateAndUpdate(Slot[] newSlots, boolean acceptUpdatesToLocal) {
1223 // The cloud communication layer has checked slot HMACs already before decoding
1224 if (newSlots.length == 0) {
1228 // Reset the table status declared sizes
1229 smallestTableStatusSeen = -1;
1230 largestTableStatusSeen = -1;
1233 // Make sure all slots are newer than the last largest slot this client has seen
1234 long firstSeqNum = newSlots[0].getSequenceNumber();
1235 if (firstSeqNum <= sequenceNumber) {
1236 throw new Error("Server Error: Sent older slots!");
1239 // Create an object that can access both new slots and slots in our local chain
1240 // without committing slots to our local chain
1241 SlotIndexer indexer = new SlotIndexer(newSlots, buffer);
1243 // Check that the HMAC chain is not broken
1244 checkHMACChain(indexer, newSlots);
1246 // Set to keep track of messages from clients
1247 HashSet<Long> machineSet = new HashSet<Long>(lastMessageTable.keySet());
1249 // Process each slots data
1250 for (Slot slot : newSlots) {
1251 processSlot(indexer, slot, acceptUpdatesToLocal, machineSet);
1254 // If there is a gap, check to see if the server sent us everything.
1255 if (firstSeqNum != (sequenceNumber + 1)) {
1257 // Check the size of the slots that were sent down by the server.
1258 // Can only check the size if there was a gap
1259 checkNumSlots(newSlots.length);
1261 // Since there was a gap every machine must have pushed a slot or must have
1262 // a last message message. If not then the server is hiding slots
1263 if (!machineSet.isEmpty()) {
1264 throw new Error("Missing record for machines: " + machineSet);
1268 // Update the size of our local block chain.
1271 // Commit new to slots to the local block chain.
1272 for (Slot slot : newSlots) {
1274 // Insert this slot into our local block chain copy.
1275 buffer.putSlot(slot);
1277 // Keep track of how many slots are currently live (have live data in them).
1281 // Get the sequence number of the latest slot in the system
1282 sequenceNumber = newSlots[newSlots.length - 1].getSequenceNumber();
1284 updateLiveStateFromServer();
1286 // No Need to remember after we pulled from the server
1287 offlineTransactionsCommittedAndAtServer.clear();
1289 // This is invalidated now
1290 hadPartialSendToServer = false;
1293 private void updateLiveStateFromServer() {
1294 // Process the new transaction parts
1295 processNewTransactionParts();
1297 // Do arbitration on new transactions that were received
1298 arbitrateFromServer();
1300 // Update all the committed keys
1301 boolean didCommitOrSpeculate = updateCommittedTable();
1303 // Delete the transactions that are now dead
1304 updateLiveTransactionsAndStatus();
1307 didCommitOrSpeculate |= updateSpeculativeTable(didCommitOrSpeculate);
1308 updatePendingTransactionSpeculativeTable(didCommitOrSpeculate);
1311 private void updateLiveStateFromLocal() {
1312 // Update all the committed keys
1313 boolean didCommitOrSpeculate = updateCommittedTable();
1315 // Delete the transactions that are now dead
1316 updateLiveTransactionsAndStatus();
1319 didCommitOrSpeculate |= updateSpeculativeTable(didCommitOrSpeculate);
1320 updatePendingTransactionSpeculativeTable(didCommitOrSpeculate);
1324 * Check the size of the block chain to make sure there are enough slots sent back by the server.
1325 * This is only called when we have a gap between the slots that we have locally and the slots
1326 * sent by the server therefore in the slots sent by the server there will be at least 1 Table
1329 private void checkNumSlots(int numberOfSlots) {
1331 // We only have 1 size so we must have this many slots
1332 if (largestTableStatusSeen == smallestTableStatusSeen) {
1333 if (numberOfSlots != smallestTableStatusSeen) {
1334 throw new Error("Server Error: Server did not send all slots. Expected: " + smallestTableStatusSeen + " Received:" + numberOfSlots);
1337 // We have more than 1
1338 if (numberOfSlots < smallestTableStatusSeen) {
1339 throw new Error("Server Error: Server did not send all slots. Expected at least: " + smallestTableStatusSeen + " Received:" + numberOfSlots);
1345 * Update the size of of the local buffer if it is needed.
1347 private void commitNewMaxSize() {
1349 int currMaxSize = 0;
1351 if (largestTableStatusSeen == -1) {
1352 // No table status seen so the current max size does not change
1353 currMaxSize = numberOfSlots;
1355 currMaxSize = largestTableStatusSeen;
1358 // Resize the local slot buffer
1359 if (numberOfSlots != currMaxSize) {
1360 buffer.resize(currMaxSize);
1363 // Change the number of local slots to the new size
1364 numberOfSlots = currMaxSize;
1366 // Recalculate the resize threshold since the size of the local buffer has changed
1367 setResizeThreshold();
1371 * Process the new transaction parts from this latest round of slots received from the server
1373 private void processNewTransactionParts() {
1375 if (newTransactionParts.size() == 0) {
1376 // Nothing new to process
1380 // Iterate through all the machine Ids that we received new parts for
1381 for (Long machineId : newTransactionParts.keySet()) {
1382 Map<Pair<Long, Integer>, TransactionPart> parts = newTransactionParts.get(machineId);
1384 // Iterate through all the parts for that machine Id
1385 for (Pair<Long, Integer> partId : parts.keySet()) {
1386 TransactionPart part = parts.get(partId);
1388 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(part.getArbitratorId());
1389 if ((lastTransactionNumber != null) && (lastTransactionNumber >= part.getSequenceNumber())) {
1390 // Set dead the transaction part
1395 // Get the transaction object for that sequence number
1396 Transaction transaction = liveTransactionBySequenceNumberTable.get(part.getSequenceNumber());
1398 if (transaction == null) {
1399 // This is a new transaction that we dont have so make a new one
1400 transaction = new Transaction();
1402 // Insert this new transaction into the live tables
1403 liveTransactionBySequenceNumberTable.put(part.getSequenceNumber(), transaction);
1404 liveTransactionByTransactionIdTable.put(part.getTransactionId(), transaction);
1407 // Add that part to the transaction
1408 transaction.addPartDecode(part);
1410 if (transaction.isComplete()) {
1411 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1412 System.out.println("Got Live Transaction " + kv + " " + part.getSequenceNumber());
1418 // Clear all the new transaction parts in preparation for the next time the server sends slots
1419 newTransactionParts.clear();
1422 private void arbitrateFromServer() {
1424 if (liveTransactionBySequenceNumberTable.size() == 0) {
1425 // Nothing to arbitrate on so move on
1429 // Get the transaction sequence numbers and sort from oldest to newest
1430 List<Long> transactionSequenceNumbers = new ArrayList<Long>(liveTransactionBySequenceNumberTable.keySet());
1431 Collections.sort(transactionSequenceNumbers);
1433 // Collection of key value pairs that are
1434 Map<IoTString, KeyValue> speculativeTableTmp = new HashMap<IoTString, KeyValue>();
1436 // The last transaction arbitrated on
1437 long lastTransactionCommitted = -1;
1438 Set<Abort> generatedAborts = new HashSet<Abort>();
1440 for (Long transactionSequenceNumber : transactionSequenceNumbers) {
1441 Transaction transaction = liveTransactionBySequenceNumberTable.get(transactionSequenceNumber);
1443 // Check if this machine arbitrates for this transaction if not then we cant arbitrate this transaction
1444 if (transaction.getArbitrator() != localMachineId) {
1448 if (offlineTransactionsCommittedAndAtServer.contains(transaction.getId())) {
1449 // We have seen this already locally so dont commit again
1454 if (!transaction.isComplete()) {
1455 // Will arbitrate in incorrect order if we continue so just break
1460 // update the largest transaction seen by arbitrator from server
1461 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) == null) {
1462 lastTransactionSeenFromMachineFromServer.put(transaction.getMachineId(), transaction.getClientLocalSequenceNumber());
1464 Long lastTransactionSeenFromMachine = lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId());
1465 if (transaction.getClientLocalSequenceNumber() > lastTransactionSeenFromMachine) {
1466 lastTransactionSeenFromMachineFromServer.put(transaction.getMachineId(), transaction.getClientLocalSequenceNumber());
1471 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1472 System.out.println("Arbitrating on: " + kv);
1475 if (transaction.evaluateGuard(committedKeyValueTable, speculativeTableTmp, null)) {
1476 // Guard evaluated as true
1478 // Update the local changes so we can make the commit
1479 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1480 speculativeTableTmp.put(kv.getKey(), kv);
1483 // Update what the last transaction committed was for use in batch commit
1484 lastTransactionCommitted = transaction.getSequenceNumber();
1486 // Guard evaluated was false so create abort
1489 Abort newAbort = new Abort(null,
1490 transaction.getClientLocalSequenceNumber(),
1491 transaction.getSequenceNumber(),
1492 transaction.getMachineId(),
1493 transaction.getArbitrator(),
1494 localArbitrationSequenceNumber);
1495 localArbitrationSequenceNumber++;
1497 generatedAborts.add(newAbort);
1499 // Insert the abort so we can process
1500 processEntry(newAbort);
1502 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1503 System.out.println("Abort From Server!!!!!! " + kv);
1508 Commit newCommit = null;
1510 // If there is something to commit
1511 if (speculativeTableTmp.size() != 0) {
1513 // Create the commit and increment the commit sequence number
1514 newCommit = new Commit(localArbitrationSequenceNumber, localMachineId, lastTransactionCommitted);
1515 localArbitrationSequenceNumber++;
1517 // Add all the new keys to the commit
1518 for (KeyValue kv : speculativeTableTmp.values()) {
1519 newCommit.addKV(kv);
1522 // create the commit parts
1523 newCommit.createCommitParts();
1525 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1527 // Insert the commit so we can process it
1528 for (CommitPart commitPart : newCommit.getParts().values()) {
1529 processEntry(commitPart);
1533 if ((newCommit != null) || (generatedAborts.size() > 0)) {
1534 ArbitrationRound arbitrationRound = new ArbitrationRound(newCommit, generatedAborts);
1535 pendingSendArbitrationRounds.add(arbitrationRound);
1537 if (compactArbitrationData()) {
1538 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1539 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1540 processEntry(commitPart);
1546 private Pair<Boolean, Boolean> arbitrateOnLocalTransaction(Transaction transaction) {
1548 // Check if this machine arbitrates for this transaction if not then we cant arbitrate this transaction
1549 if (transaction.getArbitrator() != localMachineId) {
1550 return new Pair<Boolean, Boolean>(false, false);
1553 if (!transaction.isComplete()) {
1554 // Will arbitrate in incorrect order if we continue so just break
1556 return new Pair<Boolean, Boolean>(false, false);
1559 if (transaction.getMachineId() != localMachineId) {
1560 // dont do this check for local transactions
1561 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) != null) {
1562 if (lastTransactionSeenFromMachineFromServer.get(transaction.getMachineId()) > transaction.getClientLocalSequenceNumber()) {
1563 // We've have already seen this from the server
1564 return new Pair<Boolean, Boolean>(false, false);
1569 if (transaction.evaluateGuard(committedKeyValueTable, null, null)) {
1570 // Guard evaluated as true
1572 // Create the commit and increment the commit sequence number
1573 Commit newCommit = new Commit(localArbitrationSequenceNumber, localMachineId, -1);
1574 localArbitrationSequenceNumber++;
1576 // Update the local changes so we can make the commit
1577 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1578 newCommit.addKV(kv);
1581 // create the commit parts
1582 newCommit.createCommitParts();
1584 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1585 ArbitrationRound arbitrationRound = new ArbitrationRound(newCommit, new HashSet<Abort>());
1586 pendingSendArbitrationRounds.add(arbitrationRound);
1588 if (compactArbitrationData()) {
1589 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1590 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1591 processEntry(commitPart);
1594 // Insert the commit so we can process it
1595 for (CommitPart commitPart : newCommit.getParts().values()) {
1596 processEntry(commitPart);
1600 if (transaction.getMachineId() == localMachineId) {
1601 TransactionStatus status = transaction.getTransactionStatus();
1602 if (status != null) {
1603 status.setStatus(TransactionStatus.StatusCommitted);
1607 updateLiveStateFromLocal();
1608 return new Pair<Boolean, Boolean>(true, true);
1611 if (transaction.getMachineId() == localMachineId) {
1612 // For locally created messages update the status
1614 // Guard evaluated was false so create abort
1615 TransactionStatus status = transaction.getTransactionStatus();
1616 if (status != null) {
1617 status.setStatus(TransactionStatus.StatusAborted);
1621 Set addAbortSet = new HashSet<Abort>();
1625 Abort newAbort = new Abort(null,
1626 transaction.getClientLocalSequenceNumber(),
1628 transaction.getMachineId(),
1629 transaction.getArbitrator(),
1630 localArbitrationSequenceNumber);
1631 localArbitrationSequenceNumber++;
1633 addAbortSet.add(newAbort);
1636 // Append all the commit parts to the end of the pending queue waiting for sending to the server
1637 ArbitrationRound arbitrationRound = new ArbitrationRound(null, addAbortSet);
1638 pendingSendArbitrationRounds.add(arbitrationRound);
1640 if (compactArbitrationData()) {
1641 ArbitrationRound newArbitrationRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1642 for (CommitPart commitPart : newArbitrationRound.getCommit().getParts().values()) {
1643 processEntry(commitPart);
1648 updateLiveStateFromLocal();
1649 return new Pair<Boolean, Boolean>(true, false);
1654 * 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
1656 private boolean compactArbitrationData() {
1658 if (pendingSendArbitrationRounds.size() < 2) {
1659 // Nothing to compact so do nothing
1663 ArbitrationRound lastRound = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - 1);
1664 if (lastRound.didSendPart()) {
1668 boolean hadCommit = (lastRound.getCommit() == null);
1669 boolean gotNewCommit = false;
1671 int numberToDelete = 1;
1672 while (numberToDelete < pendingSendArbitrationRounds.size()) {
1673 ArbitrationRound round = pendingSendArbitrationRounds.get(pendingSendArbitrationRounds.size() - numberToDelete - 1);
1675 if (round.isFull() || round.didSendPart()) {
1676 // Stop since there is a part that cannot be compacted and we need to compact in order
1680 if (round.getCommit() == null) {
1682 // Try compacting aborts only
1683 int newSize = round.getCurrentSize() + lastRound.getAbortsCount();
1684 if (newSize > ArbitrationRound.MAX_PARTS) {
1685 // Cant compact since it would be too large
1688 lastRound.addAborts(round.getAborts());
1691 // Create a new larger commit
1692 Commit newCommit = Commit.merge(lastRound.getCommit(), round.getCommit(), localArbitrationSequenceNumber);
1693 localArbitrationSequenceNumber++;
1695 // Create the commit parts so that we can count them
1696 newCommit.createCommitParts();
1698 // Calculate the new size of the parts
1699 int newSize = newCommit.getNumberOfParts();
1700 newSize += lastRound.getAbortsCount();
1701 newSize += round.getAbortsCount();
1703 if (newSize > ArbitrationRound.MAX_PARTS) {
1704 // Cant compact since it would be too large
1708 // Set the new compacted part
1709 lastRound.setCommit(newCommit);
1710 lastRound.addAborts(round.getAborts());
1711 gotNewCommit = true;
1717 if (numberToDelete != 1) {
1718 // If there is a compaction
1720 // Delete the previous pieces that are now in the new compacted piece
1721 if (numberToDelete == pendingSendArbitrationRounds.size()) {
1722 pendingSendArbitrationRounds.clear();
1724 for (int i = 0; i < numberToDelete; i++) {
1725 pendingSendArbitrationRounds.remove(pendingSendArbitrationRounds.size() - 1);
1729 // Add the new compacted into the pending to send list
1730 pendingSendArbitrationRounds.add(lastRound);
1732 // Should reinsert into the commit processor
1733 if (hadCommit && gotNewCommit) {
1740 // private boolean compactArbitrationData() {
1745 * Update all the commits and the committed tables, sets dead the dead transactions
1747 private boolean updateCommittedTable() {
1749 if (newCommitParts.size() == 0) {
1750 // Nothing new to process
1754 // Iterate through all the machine Ids that we received new parts for
1755 for (Long machineId : newCommitParts.keySet()) {
1756 Map<Pair<Long, Integer>, CommitPart> parts = newCommitParts.get(machineId);
1758 // Iterate through all the parts for that machine Id
1759 for (Pair<Long, Integer> partId : parts.keySet()) {
1760 CommitPart part = parts.get(partId);
1762 // Get the transaction object for that sequence number
1763 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(part.getMachineId());
1765 if (commitForClientTable == null) {
1766 // This is the first commit from this device
1767 commitForClientTable = new HashMap<Long, Commit>();
1768 liveCommitsTable.put(part.getMachineId(), commitForClientTable);
1771 Commit commit = commitForClientTable.get(part.getSequenceNumber());
1773 if (commit == null) {
1774 // This is a new commit that we dont have so make a new one
1775 commit = new Commit();
1777 // Insert this new commit into the live tables
1778 commitForClientTable.put(part.getSequenceNumber(), commit);
1781 // Add that part to the commit
1782 commit.addPartDecode(part);
1786 // Clear all the new commits parts in preparation for the next time the server sends slots
1787 newCommitParts.clear();
1789 // If we process a new commit keep track of it for future use
1790 boolean didProcessANewCommit = false;
1792 // Process the commits one by one
1793 for (Long arbitratorId : liveCommitsTable.keySet()) {
1795 // Get all the commits for a specific arbitrator
1796 Map<Long, Commit> commitForClientTable = liveCommitsTable.get(arbitratorId);
1798 // Sort the commits in order
1799 List<Long> commitSequenceNumbers = new ArrayList<Long>(commitForClientTable.keySet());
1800 Collections.sort(commitSequenceNumbers);
1802 // Go through each new commit one by one
1803 for (int i = 0; i < commitSequenceNumbers.size(); i++) {
1804 Long commitSequenceNumber = commitSequenceNumbers.get(i);
1805 Commit commit = commitForClientTable.get(commitSequenceNumber);
1807 // Special processing if a commit is not complete
1808 if (!commit.isComplete()) {
1809 if (i == (commitSequenceNumbers.size() - 1)) {
1810 // 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
1813 // This is a commit that was already dead but parts of it are still in the block chain (not flushed out yet).
1814 // Delete it and move on
1816 commitForClientTable.remove(commit.getSequenceNumber());
1821 // Get the last commit seen from this arbitrator
1822 long lastCommitSeenSequenceNumber = -1;
1823 if (lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId()) != null) {
1824 lastCommitSeenSequenceNumber = lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId());
1827 // Update the last arbitration data that we have seen so far
1828 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(commit.getMachineId()) != null) {
1830 long lastArbitrationSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(commit.getMachineId());
1831 if (commit.getSequenceNumber() > lastArbitrationSequenceNumber) {
1833 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(commit.getMachineId(), commit.getSequenceNumber());
1836 // Never seen any data from this arbitrator so record the first one
1837 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(commit.getMachineId(), commit.getSequenceNumber());
1840 // We have already seen this commit before so need to do the full processing on this commit
1841 if (commit.getSequenceNumber() <= lastCommitSeenSequenceNumber) {
1843 // Update the last transaction that was updated if we can
1844 if (commit.getTransactionSequenceNumber() != -1) {
1845 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(commit.getMachineId());
1847 // Update the last transaction sequence number that the arbitrator arbitrated on
1848 if ((lastTransactionNumber == null) || (lastTransactionNumber < commit.getTransactionSequenceNumber())) {
1849 lastArbitratedTransactionNumberByArbitratorTable.put(commit.getMachineId(), commit.getTransactionSequenceNumber());
1856 // If we got here then this is a brand new commit and needs full processing
1858 // Get what commits should be edited, these are the commits that have live values for their keys
1859 Set<Commit> commitsToEdit = new HashSet<Commit>();
1860 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
1861 commitsToEdit.add(liveCommitsByKeyTable.get(kv.getKey()));
1863 commitsToEdit.remove(null); // remove null since it could be in this set
1865 // Update each previous commit that needs to be updated
1866 for (Commit previousCommit : commitsToEdit) {
1868 // Only bother with live commits (TODO: Maybe remove this check)
1869 if (previousCommit.isLive()) {
1871 // Update which keys in the old commits are still live
1872 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
1873 previousCommit.invalidateKey(kv.getKey());
1876 // if the commit is now dead then remove it
1877 if (!previousCommit.isLive()) {
1878 commitForClientTable.remove(previousCommit);
1883 // Update the last seen sequence number from this arbitrator
1884 if (lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId()) != null) {
1885 if (commit.getSequenceNumber() > lastCommitSeenSequenceNumberByArbitratorTable.get(commit.getMachineId())) {
1886 lastCommitSeenSequenceNumberByArbitratorTable.put(commit.getMachineId(), commit.getSequenceNumber());
1892 // Update the last transaction that was updated if we can
1893 if (commit.getTransactionSequenceNumber() != -1) {
1894 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(commit.getMachineId());
1896 // Update the last transaction sequence number that the arbitrator arbitrated on
1897 if ((lastTransactionNumber == null) || (lastTransactionNumber < commit.getTransactionSequenceNumber())) {
1898 lastArbitratedTransactionNumberByArbitratorTable.put(commit.getMachineId(), commit.getTransactionSequenceNumber());
1902 // We processed a new commit that we havent seen before
1903 didProcessANewCommit = true;
1907 // Update the committed table of keys and which commit is using which key
1908 for (KeyValue kv : commit.getKeyValueUpdateSet()) {
1909 committedKeyValueTable.put(kv.getKey(), kv);
1910 liveCommitsByKeyTable.put(kv.getKey(), commit);
1915 return didProcessANewCommit;
1919 * Create the speculative table from transactions that are still live and have come from the cloud
1921 private boolean updateSpeculativeTable(boolean didProcessNewCommits) {
1922 if (liveTransactionBySequenceNumberTable.keySet().size() == 0) {
1923 // There is nothing to speculate on
1927 // Create a list of the transaction sequence numbers and sort them from oldest to newest
1928 List<Long> transactionSequenceNumbersSorted = new ArrayList<Long>(liveTransactionBySequenceNumberTable.keySet());
1929 Collections.sort(transactionSequenceNumbersSorted);
1931 boolean hasGapInTransactionSequenceNumbers = transactionSequenceNumbersSorted.get(0) != oldestTransactionSequenceNumberSpeculatedOn;
1934 if (hasGapInTransactionSequenceNumbers || didProcessNewCommits) {
1935 // If there is a gap in the transaction sequence numbers then there was a commit or an abort of a transaction
1936 // OR there was a new commit (Could be from offline commit) so a redo the speculation from scratch
1938 // Start from scratch
1939 speculatedKeyValueTable.clear();
1940 lastTransactionSequenceNumberSpeculatedOn = -1;
1941 oldestTransactionSequenceNumberSpeculatedOn = -1;
1945 // Remember the front of the transaction list
1946 oldestTransactionSequenceNumberSpeculatedOn = transactionSequenceNumbersSorted.get(0);
1948 // Find where to start arbitration from
1949 int startIndex = transactionSequenceNumbersSorted.indexOf(lastTransactionSequenceNumberSpeculatedOn) + 1;
1951 if (startIndex >= transactionSequenceNumbersSorted.size()) {
1952 // Make sure we are not out of bounds
1953 return false; // did not speculate
1956 Set<Long> incompleteTransactionArbitrator = new HashSet<Long>();
1957 boolean didSkip = true;
1959 for (int i = startIndex; i < transactionSequenceNumbersSorted.size(); i++) {
1960 long transactionSequenceNumber = transactionSequenceNumbersSorted.get(i);
1961 Transaction transaction = liveTransactionBySequenceNumberTable.get(transactionSequenceNumber);
1963 if (!transaction.isComplete()) {
1964 // If there is an incomplete transaction then there is nothing we can do
1965 // add this transactions arbitrator to the list of arbitrators we should ignore
1966 incompleteTransactionArbitrator.add(transaction.getArbitrator());
1971 if (incompleteTransactionArbitrator.contains(transaction.getArbitrator())) {
1975 lastTransactionSequenceNumberSpeculatedOn = transactionSequenceNumber;
1977 if (transaction.evaluateGuard(committedKeyValueTable, speculatedKeyValueTable, null)) {
1978 // Guard evaluated to true so update the speculative table
1979 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
1980 speculatedKeyValueTable.put(kv.getKey(), kv);
1986 // Since there was a skip we need to redo the speculation next time around
1987 lastTransactionSequenceNumberSpeculatedOn = -1;
1988 oldestTransactionSequenceNumberSpeculatedOn = -1;
1991 // We did some speculation
1996 * Create the pending transaction speculative table from transactions that are still in the pending transaction buffer
1998 private void updatePendingTransactionSpeculativeTable(boolean didProcessNewCommitsOrSpeculate) {
1999 if (pendingTransactionQueue.size() == 0) {
2000 // There is nothing to speculate on
2005 if (didProcessNewCommitsOrSpeculate || (firstPendingTransaction != pendingTransactionQueue.get(0))) {
2006 // need to reset on the pending speculation
2007 lastPendingTransactionSpeculatedOn = null;
2008 firstPendingTransaction = pendingTransactionQueue.get(0);
2009 pendingTransactionSpeculatedKeyValueTable.clear();
2012 // Find where to start arbitration from
2013 int startIndex = pendingTransactionQueue.indexOf(firstPendingTransaction) + 1;
2015 if (startIndex >= pendingTransactionQueue.size()) {
2016 // Make sure we are not out of bounds
2020 for (int i = startIndex; i < pendingTransactionQueue.size(); i++) {
2021 Transaction transaction = pendingTransactionQueue.get(i);
2023 lastPendingTransactionSpeculatedOn = transaction;
2025 if (transaction.evaluateGuard(committedKeyValueTable, speculatedKeyValueTable, pendingTransactionSpeculatedKeyValueTable)) {
2026 // Guard evaluated to true so update the speculative table
2027 for (KeyValue kv : transaction.getKeyValueUpdateSet()) {
2028 pendingTransactionSpeculatedKeyValueTable.put(kv.getKey(), kv);
2035 * Set dead and remove from the live transaction tables the transactions that are dead
2037 private void updateLiveTransactionsAndStatus() {
2039 // Go through each of the transactions
2040 for (Iterator<Map.Entry<Long, Transaction>> iter = liveTransactionBySequenceNumberTable.entrySet().iterator(); iter.hasNext();) {
2041 Transaction transaction = iter.next().getValue();
2043 // Check if the transaction is dead
2044 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(transaction.getArbitrator());
2045 if ((lastTransactionNumber != null) && (lastTransactionNumber >= transaction.getSequenceNumber())) {
2047 // Set dead the transaction
2048 transaction.setDead();
2050 // Remove the transaction from the live table
2052 liveTransactionByTransactionIdTable.remove(transaction.getId());
2056 // Go through each of the transactions
2057 for (Iterator<Map.Entry<Long, TransactionStatus>> iter = outstandingTransactionStatus.entrySet().iterator(); iter.hasNext();) {
2058 TransactionStatus status = iter.next().getValue();
2060 // Check if the transaction is dead
2061 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(status.getTransactionArbitrator());
2062 if ((lastTransactionNumber != null) && (lastTransactionNumber >= status.getTransactionSequenceNumber())) {
2065 status.setStatus(TransactionStatus.StatusCommitted);
2074 * Process this slot, entry by entry. Also update the latest message sent by slot
2076 private void processSlot(SlotIndexer indexer, Slot slot, boolean acceptUpdatesToLocal, HashSet<Long> machineSet) {
2078 // Update the last message seen
2079 updateLastMessage(slot.getMachineID(), slot.getSequenceNumber(), slot, acceptUpdatesToLocal, machineSet);
2081 // Process each entry in the slot
2082 for (Entry entry : slot.getEntries()) {
2083 switch (entry.getType()) {
2085 case Entry.TypeCommitPart:
2086 processEntry((CommitPart)entry);
2089 case Entry.TypeAbort:
2090 processEntry((Abort)entry);
2093 case Entry.TypeTransactionPart:
2094 processEntry((TransactionPart)entry);
2097 case Entry.TypeNewKey:
2098 processEntry((NewKey)entry);
2101 case Entry.TypeLastMessage:
2102 processEntry((LastMessage)entry, machineSet);
2105 case Entry.TypeRejectedMessage:
2106 processEntry((RejectedMessage)entry, indexer);
2109 case Entry.TypeTableStatus:
2110 processEntry((TableStatus)entry);
2114 throw new Error("Unrecognized type: " + entry.getType());
2120 * Update the last message that was sent for a machine Id
2122 private void processEntry(LastMessage entry, HashSet<Long> machineSet) {
2123 // Update what the last message received by a machine was
2124 updateLastMessage(entry.getMachineID(), entry.getSequenceNumber(), entry, false, machineSet);
2128 * Add the new key to the arbitrators table and update the set of live new keys (in case of a rescued new key message)
2130 private void processEntry(NewKey entry) {
2132 // Update the arbitrator table with the new key information
2133 arbitratorTable.put(entry.getKey(), entry.getMachineID());
2135 // Update what the latest live new key is
2136 NewKey oldNewKey = liveNewKeyTable.put(entry.getKey(), entry);
2137 if (oldNewKey != null) {
2138 // Delete the old new key messages
2139 oldNewKey.setDead();
2144 * Process new table status entries and set dead the old ones as new ones come in.
2145 * keeps track of the largest and smallest table status seen in this current round
2146 * of updating the local copy of the block chain
2148 private void processEntry(TableStatus entry) {
2149 int newNumSlots = entry.getMaxSlots();
2151 if (liveTableStatus != null) {
2152 // We have a larger table status so the old table status is no longer alive
2153 liveTableStatus.setDead();
2156 // Make this new table status the latest alive table status
2157 liveTableStatus = entry;
2159 if ((smallestTableStatusSeen == -1) || (newNumSlots < smallestTableStatusSeen)) {
2160 smallestTableStatusSeen = newNumSlots;
2163 if ((largestTableStatusSeen == -1) || (newNumSlots > largestTableStatusSeen)) {
2164 largestTableStatusSeen = newNumSlots;
2169 * Check old messages to see if there is a block chain violation. Also
2171 private void processEntry(RejectedMessage entry, SlotIndexer indexer) {
2172 long oldSeqNum = entry.getOldSeqNum();
2173 long newSeqNum = entry.getNewSeqNum();
2174 boolean isequal = entry.getEqual();
2175 long machineId = entry.getMachineID();
2178 // Check if we have messages that were supposed to be rejected in our local block chain
2179 for (long seqNum = oldSeqNum; seqNum <= newSeqNum; seqNum++) {
2182 Slot slot = indexer.getSlot(seqNum);
2185 // If we have this slot make sure that it was not supposed to be a rejected slot
2187 long slotMachineId = slot.getMachineID();
2188 if (isequal != (slotMachineId == machineId)) {
2189 throw new Error("Server Error: Trying to insert rejected message for slot " + seqNum);
2195 // Create a list of clients to watch until they see this rejected message entry.
2196 HashSet<Long> deviceWatchSet = new HashSet<Long>();
2197 for (Map.Entry<Long, Pair<Long, Liveness>> lastMessageEntry : lastMessageTable.entrySet()) {
2199 // Machine ID for the last message entry
2200 long lastMessageEntryMachineId = lastMessageEntry.getKey();
2202 // We've seen it, don't need to continue to watch. Our next
2203 // message will implicitly acknowledge it.
2204 if (lastMessageEntryMachineId == localMachineId) {
2208 Pair<Long, Liveness> lastMessageValue = lastMessageEntry.getValue();
2209 long entrySequenceNumber = lastMessageValue.getFirst();
2211 if (entrySequenceNumber < newSeqNum) {
2213 // Add this rejected message to the set of messages that this machine ID did not see yet
2214 addWatchList(lastMessageEntryMachineId, entry);
2216 // This client did not see this rejected message yet so add it to the watch set to monitor
2217 deviceWatchSet.add(lastMessageEntryMachineId);
2221 if (deviceWatchSet.isEmpty()) {
2222 // This rejected message has been seen by all the clients so
2225 // We need to watch this rejected message
2226 entry.setWatchSet(deviceWatchSet);
2231 * Check if this abort is live, if not then save it so we can kill it later.
2232 * update the last transaction number that was arbitrated on.
2234 private void processEntry(Abort entry) {
2237 if (entry.getTransactionSequenceNumber() != -1) {
2238 // update the transaction status if it was sent to the server
2239 TransactionStatus status = outstandingTransactionStatus.remove(entry.getTransactionSequenceNumber());
2240 if (status != null) {
2241 status.setStatus(TransactionStatus.StatusAborted);
2245 // Abort has not been seen by the client it is for yet so we need to keep track of it
2246 Abort previouslySeenAbort = liveAbortTable.put(entry.getAbortId(), entry);
2247 if (previouslySeenAbort != null) {
2248 previouslySeenAbort.setDead(); // Delete old version of the abort since we got a rescued newer version
2251 if (entry.getTransactionArbitrator() == localMachineId) {
2252 liveAbortsGeneratedByLocal.put(entry.getArbitratorLocalSequenceNumber(), entry);
2255 if ((entry.getSequenceNumber() != -1) && (lastMessageTable.get(entry.getTransactionMachineId()).getFirst() >= entry.getSequenceNumber())) {
2257 // The machine already saw this so it is dead
2259 liveAbortTable.remove(entry.getAbortId());
2261 if (entry.getTransactionArbitrator() == localMachineId) {
2262 liveAbortsGeneratedByLocal.remove(entry.getArbitratorLocalSequenceNumber());
2271 // Update the last arbitration data that we have seen so far
2272 if (lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(entry.getTransactionArbitrator()) != null) {
2274 long lastArbitrationSequenceNumber = lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.get(entry.getTransactionArbitrator());
2275 if (entry.getSequenceNumber() > lastArbitrationSequenceNumber) {
2277 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(entry.getTransactionArbitrator(), entry.getSequenceNumber());
2280 // Never seen any data from this arbitrator so record the first one
2281 lastArbitrationDataLocalSequenceNumberSeenFromArbitrator.put(entry.getTransactionArbitrator(), entry.getSequenceNumber());
2285 // Set dead a transaction if we can
2286 Transaction transactionToSetDead = liveTransactionByTransactionIdTable.remove(new Pair<Long, Long>(entry.getTransactionMachineId(), entry.getTransactionClientLocalSequenceNumber()));
2287 if (transactionToSetDead != null) {
2288 liveTransactionBySequenceNumberTable.remove(transactionToSetDead.getSequenceNumber());
2291 // Update the last transaction sequence number that the arbitrator arbitrated on
2292 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(entry.getTransactionArbitrator());
2293 if ((lastTransactionNumber == null) || (lastTransactionNumber < entry.getTransactionSequenceNumber())) {
2296 if (entry.getTransactionSequenceNumber() != -1) {
2297 lastArbitratedTransactionNumberByArbitratorTable.put(entry.getTransactionArbitrator(), entry.getTransactionSequenceNumber());
2303 * Set dead the transaction part if that transaction is dead and keep track of all new parts
2305 private void processEntry(TransactionPart entry) {
2306 // Check if we have already seen this transaction and set it dead OR if it is not alive
2307 Long lastTransactionNumber = lastArbitratedTransactionNumberByArbitratorTable.get(entry.getArbitratorId());
2308 if ((lastTransactionNumber != null) && (lastTransactionNumber >= entry.getSequenceNumber())) {
2309 // This transaction is dead, it was already committed or aborted
2314 // This part is still alive
2315 Map<Pair<Long, Integer>, TransactionPart> transactionPart = newTransactionParts.get(entry.getMachineId());
2317 if (transactionPart == null) {
2318 // Dont have a table for this machine Id yet so make one
2319 transactionPart = new HashMap<Pair<Long, Integer>, TransactionPart>();
2320 newTransactionParts.put(entry.getMachineId(), transactionPart);
2323 // Update the part and set dead ones we have already seen (got a rescued version)
2324 TransactionPart previouslySeenPart = transactionPart.put(entry.getPartId(), entry);
2325 if (previouslySeenPart != null) {
2326 previouslySeenPart.setDead();
2331 * Process new commit entries and save them for future use. Delete duplicates
2333 private void processEntry(CommitPart entry) {
2334 Map<Pair<Long, Integer>, CommitPart> commitPart = newCommitParts.get(entry.getMachineId());
2336 if (commitPart == null) {
2337 // Don't have a table for this machine Id yet so make one
2338 commitPart = new HashMap<Pair<Long, Integer>, CommitPart>();
2339 newCommitParts.put(entry.getMachineId(), commitPart);
2342 // Update the part and set dead ones we have already seen (got a rescued version)
2343 CommitPart previouslySeenPart = commitPart.put(entry.getPartId(), entry);
2344 if (previouslySeenPart != null) {
2345 previouslySeenPart.setDead();
2350 * Update the last message seen table. Update and set dead the appropriate RejectedMessages as clients see them.
2351 * Updates the live aborts, removes those that are dead and sets them dead.
2352 * Check that the last message seen is correct and that there is no mismatch of our own last message or that
2353 * other clients have not had a rollback on the last message.
2355 private void updateLastMessage(long machineId, long seqNum, Liveness liveness, boolean acceptUpdatesToLocal, HashSet<Long> machineSet) {
2357 // We have seen this machine ID
2358 machineSet.remove(machineId);
2360 // Get the set of rejected messages that this machine Id is has not seen yet
2361 HashSet<RejectedMessage> watchset = rejectedMessageWatchListTable.get(machineId);
2363 // If there is a rejected message that this machine Id has not seen yet
2364 if (watchset != null) {
2366 // Go through each rejected message that this machine Id has not seen yet
2367 for (Iterator<RejectedMessage> rmit = watchset.iterator(); rmit.hasNext(); ) {
2369 RejectedMessage rm = rmit.next();
2371 // If this machine Id has seen this rejected message...
2372 if (rm.getNewSeqNum() <= seqNum) {
2374 // Remove it from our watchlist
2377 // Decrement machines that need to see this notification
2378 rm.removeWatcher(machineId);
2383 // Set dead the abort
2384 for (Iterator<Map.Entry<Pair<Long, Long>, Abort>> i = liveAbortTable.entrySet().iterator(); i.hasNext();) {
2385 Abort abort = i.next().getValue();
2387 if ((abort.getTransactionMachineId() == machineId) && (abort.getSequenceNumber() <= seqNum)) {
2391 if (abort.getTransactionArbitrator() == localMachineId) {
2392 liveAbortsGeneratedByLocal.remove(abort.getArbitratorLocalSequenceNumber());
2399 if (machineId == localMachineId) {
2400 // Our own messages are immediately dead.
2401 if (liveness instanceof LastMessage) {
2402 ((LastMessage)liveness).setDead();
2403 } else if (liveness instanceof Slot) {
2404 ((Slot)liveness).setDead();
2406 throw new Error("Unrecognized type");
2410 // Get the old last message for this device
2411 Pair<Long, Liveness> lastMessageEntry = lastMessageTable.put(machineId, new Pair<Long, Liveness>(seqNum, liveness));
2412 if (lastMessageEntry == null) {
2413 // If no last message then there is nothing else to process
2417 long lastMessageSeqNum = lastMessageEntry.getFirst();
2418 Liveness lastEntry = lastMessageEntry.getSecond();
2420 // If it is not our machine Id since we already set ours to dead
2421 if (machineId != localMachineId) {
2422 if (lastEntry instanceof LastMessage) {
2423 ((LastMessage)lastEntry).setDead();
2424 } else if (lastEntry instanceof Slot) {
2425 ((Slot)lastEntry).setDead();
2427 throw new Error("Unrecognized type");
2431 // Make sure the server is not playing any games
2432 if (machineId == localMachineId) {
2434 if (hadPartialSendToServer) {
2435 // We were not making any updates and we had a machine mismatch
2436 if (lastMessageSeqNum > seqNum && !acceptUpdatesToLocal) {
2437 throw new Error("Server Error: Mismatch on local machine sequence number, needed at least: " + lastMessageSeqNum + " got: " + seqNum);
2441 // We were not making any updates and we had a machine mismatch
2442 if (lastMessageSeqNum != seqNum && !acceptUpdatesToLocal) {
2443 throw new Error("Server Error: Mismatch on local machine sequence number, needed: " + lastMessageSeqNum + " got: " + seqNum);
2447 if (lastMessageSeqNum > seqNum) {
2448 throw new Error("Server Error: Rollback on remote machine sequence number");
2454 * Add a rejected message entry to the watch set to keep track of which clients have seen that
2455 * rejected message entry and which have not.
2457 private void addWatchList(long machineId, RejectedMessage entry) {
2458 HashSet<RejectedMessage> entries = rejectedMessageWatchListTable.get(machineId);
2459 if (entries == null) {
2460 // There is no set for this machine ID yet so create one
2461 entries = new HashSet<RejectedMessage>();
2462 rejectedMessageWatchListTable.put(machineId, entries);
2468 * Check if the HMAC chain is not violated
2470 private void checkHMACChain(SlotIndexer indexer, Slot[] newSlots) {
2471 for (int i = 0; i < newSlots.length; i++) {
2472 Slot currSlot = newSlots[i];
2473 Slot prevSlot = indexer.getSlot(currSlot.getSequenceNumber() - 1);
2474 if (prevSlot != null &&
2475 !Arrays.equals(prevSlot.getHMAC(), currSlot.getPrevHMAC()))
2476 throw new Error("Server Error: Invalid HMAC Chain" + currSlot + " " + prevSlot);