-
- private static class ChainedTransactionProxy extends TransactionProxy {
-
- /**
- * Stores the ready Futures from the previous Tx in the chain.
- */
- private final List<Future<ActorSelection>> previousReadyFutures;
-
- /**
- * Stores the ready Futures from this transaction when it is readied.
- */
- private volatile List<Future<ActorSelection>> readyFutures;
-
- private ChainedTransactionProxy(ActorContext actorContext, TransactionType transactionType,
- String transactionChainId, List<Future<ActorSelection>> previousReadyFutures) {
- super(actorContext, transactionType, transactionChainId);
- this.previousReadyFutures = previousReadyFutures;
- }
-
- List<Future<ActorSelection>> getReadyFutures() {
- return readyFutures;
- }
-
- boolean isReady() {
- return readyFutures != null;
- }
-
- @Override
- protected void onTransactionReady(List<Future<ActorSelection>> readyFutures) {
- LOG.debug("onTransactionReady {} pending readyFutures size {} chain {}", getIdentifier(),
- readyFutures.size(), getTransactionChainId());
- this.readyFutures = readyFutures;
- }
-
- /**
- * This method is overridden to ensure the previous Tx's ready operations complete
- * before we create the next shard Tx in the chain to avoid creation failures if the
- * previous Tx's ready operations haven't completed yet.
- */
- @Override
- protected Future<Object> sendCreateTransaction(final ActorSelection shard,
- final Object serializedCreateMessage) {
-
- // Check if there are any previous ready Futures, otherwise let the super class handle it.
- if(previousReadyFutures.isEmpty()) {
- return super.sendCreateTransaction(shard, serializedCreateMessage);
- }
-
- // Combine the ready Futures into 1.
- Future<Iterable<ActorSelection>> combinedFutures = akka.dispatch.Futures.sequence(
- previousReadyFutures, getActorContext().getActorSystem().dispatcher());
-
- // Add a callback for completion of the combined Futures.
- final Promise<Object> createTxPromise = akka.dispatch.Futures.promise();
- OnComplete<Iterable<ActorSelection>> onComplete = new OnComplete<Iterable<ActorSelection>>() {
- @Override
- public void onComplete(Throwable failure, Iterable<ActorSelection> notUsed) {
- if(failure != null) {
- // A Ready Future failed so fail the returned Promise.
- createTxPromise.failure(failure);
- } else {
- LOG.debug("Previous Tx readied - sending CreateTransaction for {} on chain {}",
- getIdentifier(), getTransactionChainId());
-
- // Send the CreateTx message and use the resulting Future to complete the
- // returned Promise.
- createTxPromise.completeWith(getActorContext().executeOperationAsync(shard,
- serializedCreateMessage));
- }
- }
- };
-
- combinedFutures.onComplete(onComplete, getActorContext().getActorSystem().dispatcher());
-
- return createTxPromise.future();
- }
- }