package org.opendaylight.controller.cluster.datastore;
import akka.actor.ActorPath;
-import akka.actor.ActorRef;
import akka.actor.ActorSelection;
-import akka.actor.Props;
+import akka.dispatch.OnComplete;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.FinalizablePhantomReference;
+import com.google.common.base.FinalizableReferenceQueue;
import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.Futures;
-import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.common.util.concurrent.SettableFuture;
-import org.opendaylight.controller.cluster.datastore.exceptions.TimeoutException;
+import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier;
import org.opendaylight.controller.cluster.datastore.messages.CloseTransaction;
import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction;
import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionReply;
+import org.opendaylight.controller.cluster.datastore.messages.DataExists;
+import org.opendaylight.controller.cluster.datastore.messages.DataExistsReply;
import org.opendaylight.controller.cluster.datastore.messages.DeleteData;
import org.opendaylight.controller.cluster.datastore.messages.MergeData;
import org.opendaylight.controller.cluster.datastore.messages.ReadData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-import java.util.ArrayList;
+import scala.Function1;
+import scala.concurrent.Future;
+import scala.runtime.AbstractFunction1;
+
import java.util.HashMap;
import java.util.List;
import java.util.Map;
-import java.util.concurrent.Callable;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
/**
READ_WRITE
}
+ static Function1<Throwable, Throwable> SAME_FAILURE_TRANSFORMER = new AbstractFunction1<
+ Throwable, Throwable>() {
+ @Override
+ public Throwable apply(Throwable failure) {
+ return failure;
+ }
+ };
+
private static final AtomicLong counter = new AtomicLong();
private static final Logger
LOG = LoggerFactory.getLogger(TransactionProxy.class);
+ /**
+ * Used to enqueue the PhantomReferences for read-only TransactionProxy instances. The
+ * FinalizableReferenceQueue is safe to use statically in an OSGi environment as it uses some
+ * trickery to clean up its internal thread when the bundle is unloaded.
+ */
+ private static final FinalizableReferenceQueue phantomReferenceQueue =
+ new FinalizableReferenceQueue();
+
+ /**
+ * This stores the TransactionProxyCleanupPhantomReference instances statically, This is
+ * necessary because PhantomReferences need a hard reference so they're not garbage collected.
+ * Once finalized, the TransactionProxyCleanupPhantomReference removes itself from this map
+ * and thus becomes eligible for garbage collection.
+ */
+ private static final Map<TransactionProxyCleanupPhantomReference,
+ TransactionProxyCleanupPhantomReference> phantomReferenceCache =
+ new ConcurrentHashMap<>();
+
+ /**
+ * A PhantomReference that closes remote transactions for a TransactionProxy when it's
+ * garbage collected. This is used for read-only transactions as they're not explicitly closed
+ * by clients. So the only way to detect that a transaction is no longer in use and it's safe
+ * to clean up is when it's garbage collected. It's inexact as to when an instance will be GC'ed
+ * but TransactionProxy instances should generally be short-lived enough to avoid being moved
+ * to the old generation space and thus should be cleaned up in a timely manner as the GC
+ * runs on the young generation (eden, swap1...) space much more frequently.
+ */
+ private static class TransactionProxyCleanupPhantomReference
+ extends FinalizablePhantomReference<TransactionProxy> {
+
+ private final List<ActorSelection> remoteTransactionActors;
+ private final AtomicBoolean remoteTransactionActorsMB;
+ private final ActorContext actorContext;
+ private final TransactionIdentifier identifier;
+
+ protected TransactionProxyCleanupPhantomReference(TransactionProxy referent) {
+ super(referent, phantomReferenceQueue);
+
+ // Note we need to cache the relevant fields from the TransactionProxy as we can't
+ // have a hard reference to the TransactionProxy instance itself.
+
+ remoteTransactionActors = referent.remoteTransactionActors;
+ remoteTransactionActorsMB = referent.remoteTransactionActorsMB;
+ actorContext = referent.actorContext;
+ identifier = referent.identifier;
+ }
+
+ @Override
+ public void finalizeReferent() {
+ LOG.trace("Cleaning up {} Tx actors for TransactionProxy {}",
+ remoteTransactionActors.size(), identifier);
+
+ phantomReferenceCache.remove(this);
+
+ // Access the memory barrier volatile to ensure all previous updates to the
+ // remoteTransactionActors list are visible to this thread.
+
+ if(remoteTransactionActorsMB.get()) {
+ for(ActorSelection actor : remoteTransactionActors) {
+ LOG.trace("Sending CloseTransaction to {}", actor);
+ actorContext.sendRemoteOperationAsync(actor,
+ new CloseTransaction().toSerializable());
+ }
+ }
+ }
+ }
+
+ /**
+ * Stores the remote Tx actors for each requested data store path to be used by the
+ * PhantomReference to close the remote Tx's. This is only used for read-only Tx's. The
+ * remoteTransactionActorsMB volatile serves as a memory barrier to publish updates to the
+ * remoteTransactionActors list so they will be visible to the thread accessing the
+ * PhantomReference.
+ */
+ private List<ActorSelection> remoteTransactionActors;
+ private AtomicBoolean remoteTransactionActorsMB;
+
+ private final Map<String, TransactionContext> remoteTransactionPaths = new HashMap<>();
+
private final TransactionType transactionType;
private final ActorContext actorContext;
- private final Map<String, TransactionContext> remoteTransactionPaths = new HashMap<>();
- private final String identifier;
- private final ListeningExecutorService executor;
+ private final TransactionIdentifier identifier;
private final SchemaContext schemaContext;
+ private boolean inReadyState;
+
+ public TransactionProxy(ActorContext actorContext, TransactionType transactionType) {
+ this.actorContext = Preconditions.checkNotNull(actorContext,
+ "actorContext should not be null");
+ this.transactionType = Preconditions.checkNotNull(transactionType,
+ "transactionType should not be null");
+ this.schemaContext = Preconditions.checkNotNull(actorContext.getSchemaContext(),
+ "schemaContext should not be null");
+
+ String memberName = actorContext.getCurrentMemberName();
+ if(memberName == null){
+ memberName = "UNKNOWN-MEMBER";
+ }
+
+ this.identifier = TransactionIdentifier.builder().memberName(memberName).counter(
+ counter.getAndIncrement()).build();
- public TransactionProxy(
- ActorContext actorContext,
- TransactionType transactionType,
- ListeningExecutorService executor,
- SchemaContext schemaContext
- ) {
+ if(transactionType == TransactionType.READ_ONLY) {
+ // Read-only Tx's aren't explicitly closed by the client so we create a PhantomReference
+ // to close the remote Tx's when this instance is no longer in use and is garbage
+ // collected.
- this.identifier = actorContext.getCurrentMemberName() + "-txn-" + counter.getAndIncrement();
- this.transactionType = transactionType;
- this.actorContext = actorContext;
- this.executor = executor;
- this.schemaContext = schemaContext;
+ remoteTransactionActors = Lists.newArrayList();
+ remoteTransactionActorsMB = new AtomicBoolean();
+
+ TransactionProxyCleanupPhantomReference cleanup =
+ new TransactionProxyCleanupPhantomReference(this);
+ phantomReferenceCache.put(cleanup, cleanup);
+ }
+ LOG.debug("Created txn {} of type {}", identifier, transactionType);
+ }
+
+ @VisibleForTesting
+ List<Future<Object>> getRecordedOperationFutures() {
+ List<Future<Object>> recordedOperationFutures = Lists.newArrayList();
+ for(TransactionContext transactionContext : remoteTransactionPaths.values()) {
+ recordedOperationFutures.addAll(transactionContext.getRecordedOperationFutures());
+ }
+ return recordedOperationFutures;
}
@Override
public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> read(
final YangInstanceIdentifier path) {
+ Preconditions.checkState(transactionType != TransactionType.WRITE_ONLY,
+ "Read operation on write-only transaction is not allowed");
+
+ LOG.debug("Tx {} read {}", identifier, path);
+
createTransactionIfMissing(actorContext, path);
return transactionContext(path).readData(path);
}
+ @Override
+ public CheckedFuture<Boolean, ReadFailedException> exists(YangInstanceIdentifier path) {
+
+ Preconditions.checkState(transactionType != TransactionType.WRITE_ONLY,
+ "Exists operation on write-only transaction is not allowed");
+
+ LOG.debug("Tx {} exists {}", identifier, path);
+
+ createTransactionIfMissing(actorContext, path);
+
+ return transactionContext(path).dataExists(path);
+ }
+
+ private void checkModificationState() {
+ Preconditions.checkState(transactionType != TransactionType.READ_ONLY,
+ "Modification operation on read-only transaction is not allowed");
+ Preconditions.checkState(!inReadyState,
+ "Transaction is sealed - further modifications are not allowed");
+ }
+
@Override
public void write(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+ checkModificationState();
+
+ LOG.debug("Tx {} write {}", identifier, path);
+
createTransactionIfMissing(actorContext, path);
transactionContext(path).writeData(path, data);
@Override
public void merge(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+ checkModificationState();
+
+ LOG.debug("Tx {} merge {}", identifier, path);
+
createTransactionIfMissing(actorContext, path);
transactionContext(path).mergeData(path, data);
@Override
public void delete(YangInstanceIdentifier path) {
+ checkModificationState();
+
+ LOG.debug("Tx {} delete {}", identifier, path);
+
createTransactionIfMissing(actorContext, path);
transactionContext(path).deleteData(path);
@Override
public DOMStoreThreePhaseCommitCohort ready() {
- List<ActorPath> cohortPaths = new ArrayList<>();
+
+ checkModificationState();
+
+ inReadyState = true;
+
+ LOG.debug("Tx {} Trying to get {} transactions ready for commit", identifier,
+ remoteTransactionPaths.size());
+
+ List<Future<ActorPath>> cohortPathFutures = Lists.newArrayList();
for(TransactionContext transactionContext : remoteTransactionPaths.values()) {
- Object result = transactionContext.readyTransaction();
- if(result.getClass().equals(ReadyTransactionReply.SERIALIZABLE_CLASS)){
- ReadyTransactionReply reply = ReadyTransactionReply.fromSerializable(actorContext.getActorSystem(),result);
- String resolvedCohortPath = transactionContext
- .getResolvedCohortPath(reply.getCohortPath().toString());
- cohortPaths.add(actorContext.actorFor(resolvedCohortPath));
- }
+ LOG.debug("Tx {} Readying transaction for shard {}", identifier,
+ transactionContext.getShardName());
+
+ cohortPathFutures.add(transactionContext.readyTransaction());
}
- return new ThreePhaseCommitCohortProxy(actorContext, cohortPaths, identifier, executor);
+ return new ThreePhaseCommitCohortProxy(actorContext, cohortPathFutures,
+ identifier.toString());
}
@Override
for(TransactionContext transactionContext : remoteTransactionPaths.values()) {
transactionContext.closeTransaction();
}
+
+ remoteTransactionPaths.clear();
+
+ if(transactionType == TransactionType.READ_ONLY) {
+ remoteTransactionActors.clear();
+ remoteTransactionActorsMB.set(true);
+ }
}
private TransactionContext transactionContext(YangInstanceIdentifier path){
try {
Object response = actorContext.executeShardOperation(shardName,
- new CreateTransaction(identifier).toSerializable(),
- ActorContext.ASK_DURATION);
- if (response.getClass()
- .equals(CreateTransactionReply.SERIALIZABLE_CLASS)) {
+ new CreateTransaction(identifier.toString(),this.transactionType.ordinal() ).toSerializable());
+ if (response.getClass().equals(CreateTransactionReply.SERIALIZABLE_CLASS)) {
CreateTransactionReply reply =
CreateTransactionReply.fromSerializable(response);
String transactionPath = reply.getTransactionPath();
- LOG.info("Received transaction path = {}" , transactionPath );
+ LOG.debug("Tx {} Received transaction path = {}", identifier, transactionPath);
+
+ ActorSelection transactionActor = actorContext.actorSelection(transactionPath);
- ActorSelection transactionActor =
- actorContext.actorSelection(transactionPath);
- transactionContext =
- new TransactionContextImpl(shardName, transactionPath,
- transactionActor);
+ 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(TimeoutException e){
- LOG.warn("Timed out trying to create transaction on shard {}: {}", shardName, e);
- remoteTransactionPaths.put(shardName, new NoOpTransactionContext(shardName));
+ } 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();
- String getResolvedCohortPath(String cohortPath);
+ void closeTransaction();
- public void closeTransaction();
+ Future<ActorPath> readyTransaction();
- public Object readyTransaction();
+ void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data);
void deleteData(YangInstanceIdentifier path);
CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> readData(
final YangInstanceIdentifier path);
- void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data);
- }
+ CheckedFuture<Boolean, ReadFailedException> dataExists(YangInstanceIdentifier path);
+ List<Future<Object>> getRecordedOperationFutures();
+ }
- private class TransactionContextImpl implements TransactionContext{
- private final String shardName;
- private final String actorPath;
- private final ActorSelection actor;
+ private static abstract class AbstractTransactionContext implements TransactionContext {
+ protected final TransactionIdentifier identifier;
+ protected final String shardName;
+ protected final List<Future<Object>> recordedOperationFutures = Lists.newArrayList();
- private TransactionContextImpl(String shardName, String actorPath,
- ActorSelection actor) {
+ AbstractTransactionContext(String shardName, TransactionIdentifier identifier) {
this.shardName = shardName;
- this.actorPath = actorPath;
- this.actor = actor;
+ this.identifier = identifier;
}
- @Override public String getShardName() {
+ @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;
}
- @Override public String getResolvedCohortPath(String cohortPath){
+ private String getResolvedCohortPath(String cohortPath) {
return actorContext.resolvePath(actorPath, cohortPath);
}
- @Override public void closeTransaction() {
- getActor().tell(
- new CloseTransaction().toSerializable(), null);
+ @Override
+ public void closeTransaction() {
+ LOG.debug("Tx {} closeTransaction called", identifier);
+ actorContext.sendRemoteOperationAsync(getActor(), new CloseTransaction().toSerializable());
}
- @Override public Object readyTransaction() {
- return actorContext.executeRemoteOperation(getActor(),
- new ReadyTransaction().toSerializable(),
- ActorContext.ASK_DURATION
- );
+ @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());
+
+ // 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) {
- getActor().tell(new DeleteData(path).toSerializable(), null);
+ @Override
+ public void deleteData(YangInstanceIdentifier path) {
+ LOG.debug("Tx {} deleteData called path = {}", identifier, path);
+ recordedOperationFutures.add(actorContext.executeRemoteOperationAsync(getActor(),
+ new DeleteData(path).toSerializable() ));
}
- @Override public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data){
- getActor().tell(new MergeData(path, data, schemaContext).toSerializable(), null);
+ @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()));
}
- @Override public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> readData(
- final YangInstanceIdentifier path) {
+ @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()));
+ }
- Callable<Optional<NormalizedNode<?,?>>> call = new Callable<Optional<NormalizedNode<?,?>>>() {
+ @Override
+ public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> readData(
+ final YangInstanceIdentifier path) {
- @Override public Optional<NormalizedNode<?,?>> call() throws Exception {
- Object response = actorContext
- .executeRemoteOperation(getActor(), new ReadData(path).toSerializable(),
- ActorContext.ASK_DURATION);
- if(response.getClass().equals(ReadDataReply.SERIALIZABLE_CLASS)){
- ReadDataReply reply = ReadDataReply.fromSerializable(schemaContext,path, response);
- if(reply.getNormalizedNode() == null){
- return Optional.absent();
+ 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);
}
- return Optional.<NormalizedNode<?,?>>of(reply.getNormalizedNode());
}
+ };
- return Optional.absent();
+ 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));
+ }
+ }
}
};
- return MappingCheckedFuture.create(executor.submit(call), ReadFailedException.MAPPER);
+ Future<Object> readFuture = actorContext.executeRemoteOperationAsync(getActor(),
+ new ReadData(path).toSerializable());
+ readFuture.onComplete(onComplete, actorContext.getActorSystem().dispatcher());
}
- @Override public void writeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
- getActor().tell(new WriteData(path, data, schemaContext).toSerializable(), null);
+ @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) {
- private class NoOpTransactionContext implements TransactionContext {
+ LOG.debug("Tx {} finishDataExists called path = {}", identifier, path);
- private final Logger
- LOG = LoggerFactory.getLogger(NoOpTransactionContext.class);
+ 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);
- private final String shardName;
+ returnFuture.setException(new ReadFailedException(
+ "Error checking data exists for path " + path, failure));
+ } else {
+ LOG.debug("Tx {} dataExists operation succeeded", identifier, failure);
- private ActorRef cohort;
+ 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));
+ }
+ }
+ }
+ };
- public NoOpTransactionContext(String shardName){
- this.shardName = shardName;
+ Future<Object> future = actorContext.executeRemoteOperationAsync(getActor(),
+ new DataExists(path).toSerializable());
+ future.onComplete(onComplete, actorContext.getActorSystem().dispatcher());
}
- @Override public String getShardName() {
- return shardName;
+ }
+
+ 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 String getResolvedCohortPath(String cohortPath) {
- return cohort.path().toString();
+ @Override
+ public void closeTransaction() {
+ LOG.debug("NoOpTransactionContext {} closeTransaction called", identifier);
}
- @Override public void closeTransaction() {
- LOG.error("closeTransaction called");
+ @Override
+ public Future<ActorPath> readyTransaction() {
+ LOG.debug("Tx {} readyTransaction called", identifier);
+ return akka.dispatch.Futures.failed(failure);
}
- @Override public Object readyTransaction() {
- LOG.error("readyTransaction called");
- cohort = actorContext.getActorSystem().actorOf(Props.create(NoOpCohort.class));
- return new ReadyTransactionReply(cohort.path()).toSerializable();
+ @Override
+ public void deleteData(YangInstanceIdentifier path) {
+ LOG.debug("Tx {} deleteData called path = {}", identifier, path);
}
- @Override public void deleteData(YangInstanceIdentifier path) {
- LOG.error("deleteData called path = {}", path);
+ @Override
+ public void mergeData(YangInstanceIdentifier path, NormalizedNode<?, ?> data) {
+ LOG.debug("Tx {} mergeData called path = {}", identifier, path);
}
- @Override public void mergeData(YangInstanceIdentifier path,
- NormalizedNode<?, ?> data) {
- LOG.error("mergeData called path = {}", 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.error("readData called path = {}", path);
- return Futures.immediateCheckedFuture(
- Optional.<NormalizedNode<?, ?>>absent());
+ LOG.debug("Tx {} readData called path = {}", identifier, path);
+ return Futures.immediateFailedCheckedFuture(new ReadFailedException(
+ "Error reading data for path " + path, failure));
}
- @Override public void writeData(YangInstanceIdentifier path,
- NormalizedNode<?, ?> data) {
- LOG.error("writeData called path = {}", path);
+ @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));
}
}
-
-
-
}