+ private String shardNameFromIdentifier(YangInstanceIdentifier path){
+ return ShardStrategyFactory.getStrategy(path).findShard(path);
+ }
+
+ private void createTransactionIfMissing(ActorContext actorContext, YangInstanceIdentifier path) {
+ String shardName = ShardStrategyFactory.getStrategy(path).findShard(path);
+
+ TransactionContext transactionContext =
+ remoteTransactionPaths.get(shardName);
+
+ if(transactionContext != null){
+ // A transaction already exists with that shard
+ return;
+ }
+
+ try {
+ Object response = actorContext.executeShardOperation(shardName,
+ new CreateTransaction(identifier.toString(),this.transactionType.ordinal() ).toSerializable(),
+ ActorContext.ASK_DURATION);
+ if (response.getClass().equals(CreateTransactionReply.SERIALIZABLE_CLASS)) {
+ CreateTransactionReply reply =
+ CreateTransactionReply.fromSerializable(response);
+
+ String transactionPath = reply.getTransactionPath();
+
+ LOG.debug("Tx {} Received transaction path = {}", identifier, transactionPath);
+
+ ActorSelection transactionActor = actorContext.actorSelection(transactionPath);
+
+ if(transactionType == TransactionType.READ_ONLY) {
+ // Add the actor to the remoteTransactionActors list for access by the
+ // cleanup PhantonReference.
+ remoteTransactionActors.add(transactionActor);
+
+ // Write to the memory barrier volatile to publish the above update to the
+ // remoteTransactionActors list for thread visibility.
+ remoteTransactionActorsMB.set(true);
+ }
+
+ transactionContext = new TransactionContextImpl(shardName, transactionPath,
+ transactionActor, identifier, actorContext, schemaContext);
+
+ remoteTransactionPaths.put(shardName, transactionContext);
+ } else {
+ throw new IllegalArgumentException(String.format(
+ "Invalid reply type {} for CreateTransaction", response.getClass()));
+ }
+ } catch(Exception e){
+ LOG.debug("Tx {} Creating NoOpTransaction because of : {}", identifier, e.getMessage());
+ remoteTransactionPaths.put(shardName, new NoOpTransactionContext(shardName, e, identifier));
+ }
+ }
+
+ private interface TransactionContext {
+ String getShardName();
+
+ void closeTransaction();
+
+ Future<ActorPath> readyTransaction();
+
+ void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data);
+
+ void deleteData(YangInstanceIdentifier path);
+
+ void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data);
+
+ CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> readData(
+ final YangInstanceIdentifier path);
+
+ CheckedFuture<Boolean, ReadFailedException> dataExists(YangInstanceIdentifier path);
+
+ List<Future<Object>> getRecordedOperationFutures();
+ }
+
+ private static abstract class AbstractTransactionContext implements TransactionContext {
+
+ protected final TransactionIdentifier identifier;
+ protected final String shardName;
+ protected final List<Future<Object>> recordedOperationFutures = Lists.newArrayList();
+
+ AbstractTransactionContext(String shardName, TransactionIdentifier identifier) {
+ this.shardName = shardName;
+ this.identifier = identifier;
+ }
+
+ @Override
+ public String getShardName() {
+ return shardName;
+ }
+
+ @Override
+ public List<Future<Object>> getRecordedOperationFutures() {
+ return recordedOperationFutures;
+ }
+ }
+
+ private static class TransactionContextImpl extends AbstractTransactionContext {
+ private final Logger LOG = LoggerFactory.getLogger(TransactionContextImpl.class);
+
+ private final ActorContext actorContext;
+ private final SchemaContext schemaContext;
+ private final String actorPath;
+ private final ActorSelection actor;
+
+ private TransactionContextImpl(String shardName, String actorPath,
+ ActorSelection actor, TransactionIdentifier identifier, ActorContext actorContext,
+ SchemaContext schemaContext) {
+ super(shardName, identifier);
+ this.actorPath = actorPath;
+ this.actor = actor;
+ this.actorContext = actorContext;
+ this.schemaContext = schemaContext;
+ }
+
+ private ActorSelection getActor() {
+ return actor;
+ }
+
+ private String getResolvedCohortPath(String cohortPath) {
+ return actorContext.resolvePath(actorPath, cohortPath);
+ }
+
+ @Override
+ public void closeTransaction() {
+ LOG.debug("Tx {} closeTransaction called", identifier);
+ actorContext.sendRemoteOperationAsync(getActor(), new CloseTransaction().toSerializable());
+ }
+
+ @Override
+ public Future<ActorPath> readyTransaction() {
+ LOG.debug("Tx {} readyTransaction called with {} previous recorded operations pending",
+ identifier, recordedOperationFutures.size());
+
+ // Send the ReadyTransaction message to the Tx actor.
+
+ final Future<Object> replyFuture = actorContext.executeRemoteOperationAsync(getActor(),
+ new ReadyTransaction().toSerializable(), ActorContext.ASK_DURATION);
+
+ // Combine all the previously recorded put/merge/delete operation reply Futures and the
+ // ReadyTransactionReply Future into one Future. If any one fails then the combined
+ // Future will fail. We need all prior operations and the ready operation to succeed
+ // in order to attempt commit.
+
+ List<Future<Object>> futureList =
+ Lists.newArrayListWithCapacity(recordedOperationFutures.size() + 1);
+ futureList.addAll(recordedOperationFutures);
+ futureList.add(replyFuture);
+
+ Future<Iterable<Object>> combinedFutures = akka.dispatch.Futures.sequence(futureList,
+ actorContext.getActorSystem().dispatcher());
+
+ // Transform the combined Future into a Future that returns the cohort actor path from
+ // the ReadyTransactionReply. That's the end result of the ready operation.
+
+ return combinedFutures.transform(new AbstractFunction1<Iterable<Object>, ActorPath>() {
+ @Override
+ public ActorPath apply(Iterable<Object> notUsed) {
+
+ LOG.debug("Tx {} readyTransaction: pending recorded operations succeeded",
+ identifier);
+
+ // At this point all the Futures succeeded and we need to extract the cohort
+ // actor path from the ReadyTransactionReply. For the recorded operations, they
+ // don't return any data so we're only interested that they completed
+ // successfully. We could be paranoid and verify the correct reply types but
+ // that really should never happen so it's not worth the overhead of
+ // de-serializing each reply.
+
+ // Note the Future get call here won't block as it's complete.
+ Object serializedReadyReply = replyFuture.value().get().get();
+ if(serializedReadyReply.getClass().equals(
+ ReadyTransactionReply.SERIALIZABLE_CLASS)) {
+ ReadyTransactionReply reply = ReadyTransactionReply.fromSerializable(
+ actorContext.getActorSystem(), serializedReadyReply);
+
+ String resolvedCohortPath = getResolvedCohortPath(
+ reply.getCohortPath().toString());
+
+ LOG.debug("Tx {} readyTransaction: resolved cohort path {}",
+ identifier, resolvedCohortPath);
+
+ return actorContext.actorFor(resolvedCohortPath);
+ } else {
+ // Throwing an exception here will fail the Future.
+
+ throw new IllegalArgumentException(String.format("Invalid reply type {}",
+ serializedReadyReply.getClass()));
+ }
+ }
+ }, SAME_FAILURE_TRANSFORMER, actorContext.getActorSystem().dispatcher());
+ }
+
+ @Override
+ public void deleteData(YangInstanceIdentifier path) {
+ LOG.debug("Tx {} deleteData called path = {}", identifier, path);
+ recordedOperationFutures.add(actorContext.executeRemoteOperationAsync(getActor(),
+ new DeleteData(path).toSerializable(), ActorContext.ASK_DURATION ));
+ }
+
+ @Override
+ public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+ LOG.debug("Tx {} mergeData called path = {}", identifier, path);
+ recordedOperationFutures.add(actorContext.executeRemoteOperationAsync(getActor(),
+ new MergeData(path, data, schemaContext).toSerializable(),
+ ActorContext.ASK_DURATION));
+ }
+
+ @Override
+ public void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+ LOG.debug("Tx {} writeData called path = {}", identifier, path);
+ recordedOperationFutures.add(actorContext.executeRemoteOperationAsync(getActor(),
+ new WriteData(path, data, schemaContext).toSerializable(),
+ ActorContext.ASK_DURATION));
+ }
+
+ @Override
+ public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> readData(
+ final YangInstanceIdentifier path) {
+
+ LOG.debug("Tx {} readData called path = {}", identifier, path);
+
+ final SettableFuture<Optional<NormalizedNode<?, ?>>> returnFuture = SettableFuture.create();
+
+ // If there were any previous recorded put/merge/delete operation reply Futures then we
+ // must wait for them to successfully complete. This is necessary to honor the read
+ // uncommitted semantics of the public API contract. If any one fails then fail the read.
+
+ if(recordedOperationFutures.isEmpty()) {
+ finishReadData(path, returnFuture);
+ } else {
+ LOG.debug("Tx {} readData: verifying {} previous recorded operations",
+ identifier, recordedOperationFutures.size());
+
+ // Note: we make a copy of recordedOperationFutures to be on the safe side in case
+ // Futures#sequence accesses the passed List on a different thread, as
+ // recordedOperationFutures is not synchronized.
+
+ Future<Iterable<Object>> combinedFutures = akka.dispatch.Futures.sequence(
+ Lists.newArrayList(recordedOperationFutures),
+ actorContext.getActorSystem().dispatcher());
+ OnComplete<Iterable<Object>> onComplete = new OnComplete<Iterable<Object>>() {
+ @Override
+ public void onComplete(Throwable failure, Iterable<Object> notUsed)
+ throws Throwable {
+ if(failure != null) {
+ LOG.debug("Tx {} readData: a recorded operation failed: {}",
+ identifier, failure);
+
+ returnFuture.setException(new ReadFailedException(
+ "The read could not be performed because a previous put, merge,"
+ + "or delete operation failed", failure));
+ } else {
+ finishReadData(path, returnFuture);
+ }
+ }
+ };
+
+ combinedFutures.onComplete(onComplete, actorContext.getActorSystem().dispatcher());
+ }
+
+ return MappingCheckedFuture.create(returnFuture, ReadFailedException.MAPPER);
+ }
+
+ private void finishReadData(final YangInstanceIdentifier path,
+ final SettableFuture<Optional<NormalizedNode<?, ?>>> returnFuture) {
+
+ LOG.debug("Tx {} finishReadData called path = {}", identifier, path);
+
+ OnComplete<Object> onComplete = new OnComplete<Object>() {
+ @Override
+ public void onComplete(Throwable failure, Object readResponse) throws Throwable {
+ if(failure != null) {
+ LOG.debug("Tx {} read operation failed: {}", identifier, failure);
+
+ returnFuture.setException(new ReadFailedException(
+ "Error reading data for path " + path, failure));
+
+ } else {
+ LOG.debug("Tx {} read operation succeeded", identifier, failure);
+
+ if (readResponse.getClass().equals(ReadDataReply.SERIALIZABLE_CLASS)) {
+ ReadDataReply reply = ReadDataReply.fromSerializable(schemaContext,
+ path, readResponse);
+ if (reply.getNormalizedNode() == null) {
+ returnFuture.set(Optional.<NormalizedNode<?, ?>>absent());
+ } else {
+ returnFuture.set(Optional.<NormalizedNode<?, ?>>of(
+ reply.getNormalizedNode()));
+ }
+ } else {
+ returnFuture.setException(new ReadFailedException(
+ "Invalid response reading data for path " + path));
+ }
+ }
+ }
+ };
+
+ Future<Object> readFuture = actorContext.executeRemoteOperationAsync(getActor(),
+ new ReadData(path).toSerializable(), ActorContext.ASK_DURATION);
+ readFuture.onComplete(onComplete, actorContext.getActorSystem().dispatcher());
+ }
+
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> dataExists(
+ final YangInstanceIdentifier path) {
+
+ LOG.debug("Tx {} dataExists called path = {}", identifier, path);
+
+ final SettableFuture<Boolean> returnFuture = SettableFuture.create();
+
+ // If there were any previous recorded put/merge/delete operation reply Futures then we
+ // must wait for them to successfully complete. This is necessary to honor the read
+ // uncommitted semantics of the public API contract. If any one fails then fail this
+ // request.
+
+ if(recordedOperationFutures.isEmpty()) {
+ finishDataExists(path, returnFuture);
+ } else {
+ LOG.debug("Tx {} dataExists: verifying {} previous recorded operations",
+ identifier, recordedOperationFutures.size());
+
+ // Note: we make a copy of recordedOperationFutures to be on the safe side in case
+ // Futures#sequence accesses the passed List on a different thread, as
+ // recordedOperationFutures is not synchronized.
+
+ Future<Iterable<Object>> combinedFutures = akka.dispatch.Futures.sequence(
+ Lists.newArrayList(recordedOperationFutures),
+ actorContext.getActorSystem().dispatcher());
+ OnComplete<Iterable<Object>> onComplete = new OnComplete<Iterable<Object>>() {
+ @Override
+ public void onComplete(Throwable failure, Iterable<Object> notUsed)
+ throws Throwable {
+ if(failure != null) {
+ LOG.debug("Tx {} dataExists: a recorded operation failed: {}",
+ identifier, failure);
+
+ returnFuture.setException(new ReadFailedException(
+ "The data exists could not be performed because a previous "
+ + "put, merge, or delete operation failed", failure));
+ } else {
+ finishDataExists(path, returnFuture);
+ }
+ }
+ };
+
+ combinedFutures.onComplete(onComplete, actorContext.getActorSystem().dispatcher());
+ }
+
+ return MappingCheckedFuture.create(returnFuture, ReadFailedException.MAPPER);
+ }
+
+ private void finishDataExists(final YangInstanceIdentifier path,
+ final SettableFuture<Boolean> returnFuture) {
+
+ LOG.debug("Tx {} finishDataExists called path = {}", identifier, path);
+
+ OnComplete<Object> onComplete = new OnComplete<Object>() {
+ @Override
+ public void onComplete(Throwable failure, Object response) throws Throwable {
+ if(failure != null) {
+ LOG.debug("Tx {} dataExists operation failed: {}", identifier, failure);
+
+ returnFuture.setException(new ReadFailedException(
+ "Error checking data exists for path " + path, failure));
+ } else {
+ LOG.debug("Tx {} dataExists operation succeeded", identifier, failure);
+
+ if (response.getClass().equals(DataExistsReply.SERIALIZABLE_CLASS)) {
+ returnFuture.set(Boolean.valueOf(DataExistsReply.
+ fromSerializable(response).exists()));
+ } else {
+ returnFuture.setException(new ReadFailedException(
+ "Invalid response checking exists for path " + path));
+ }
+ }
+ }
+ };
+
+ Future<Object> future = actorContext.executeRemoteOperationAsync(getActor(),
+ new DataExists(path).toSerializable(), ActorContext.ASK_DURATION);
+ future.onComplete(onComplete, actorContext.getActorSystem().dispatcher());
+ }
+ }
+
+ private static class NoOpTransactionContext extends AbstractTransactionContext {
+
+ private final Logger LOG = LoggerFactory.getLogger(NoOpTransactionContext.class);
+
+ private final Exception failure;
+
+ public NoOpTransactionContext(String shardName, Exception failure,
+ TransactionIdentifier identifier){
+ super(shardName, identifier);
+ this.failure = failure;
+ }
+
+ @Override
+ public void closeTransaction() {
+ LOG.debug("NoOpTransactionContext {} closeTransaction called", identifier);
+ }
+
+ @Override
+ public Future<ActorPath> readyTransaction() {
+ LOG.debug("Tx {} readyTransaction called", identifier);
+ return akka.dispatch.Futures.failed(failure);
+ }
+
+ @Override
+ public void deleteData(YangInstanceIdentifier path) {
+ LOG.debug("Tx {} deleteData called path = {}", identifier, path);
+ }
+
+ @Override
+ public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+ LOG.debug("Tx {} mergeData called path = {}", identifier, path);
+ }
+
+ @Override
+ public void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+ LOG.debug("Tx {} writeData called path = {}", identifier, path);
+ }
+
+ @Override
+ public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> readData(
+ YangInstanceIdentifier path) {
+ LOG.debug("Tx {} readData called path = {}", identifier, path);
+ return Futures.immediateFailedCheckedFuture(new ReadFailedException(
+ "Error reading data for path " + path, failure));
+ }
+
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> dataExists(
+ YangInstanceIdentifier path) {
+ LOG.debug("Tx {} dataExists called path = {}", identifier, path);
+ return Futures.immediateFailedCheckedFuture(new ReadFailedException(
+ "Error checking exists for path " + path, failure));
+ }