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/*
* Copyright (c) 2014 Brocade Communications Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.controller.cluster.databroker;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
import static org.opendaylight.mdsal.dom.broker.TransactionCommitFailedExceptionMapper.CAN_COMMIT_ERROR_MAPPER;
import static org.opendaylight.mdsal.dom.broker.TransactionCommitFailedExceptionMapper.COMMIT_ERROR_MAPPER;
import static org.opendaylight.mdsal.dom.broker.TransactionCommitFailedExceptionMapper.PRE_COMMIT_MAPPER;
import com.google.common.annotations.Beta;
import com.google.common.util.concurrent.AbstractFuture;
import com.google.common.util.concurrent.FluentFuture;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.MoreExecutors;
import java.util.Map;
import java.util.concurrent.Executor;
import org.opendaylight.controller.cluster.datastore.exceptions.NoShardLeaderException;
import org.opendaylight.controller.cluster.datastore.exceptions.ShardLeaderNotRespondingException;
import org.opendaylight.mdsal.common.api.CommitInfo;
import org.opendaylight.mdsal.common.api.DataStoreUnavailableException;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.mdsal.common.api.TransactionCommitFailedException;
import org.opendaylight.mdsal.dom.api.DOMDataTreeWriteTransaction;
import org.opendaylight.mdsal.dom.broker.TransactionCommitFailedExceptionMapper;
import org.opendaylight.mdsal.dom.spi.store.DOMStore;
import org.opendaylight.mdsal.dom.spi.store.DOMStoreThreePhaseCommitCohort;
import org.opendaylight.yangtools.util.DurationStatisticsTracker;
import org.opendaylight.yangtools.yang.common.Empty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ConcurrentDOMDataBroker commits transactions concurrently. The 3
* commit phases (canCommit, preCommit, and commit) are performed serially and non-blocking
* (ie async) per transaction but multiple transaction commits can run concurrent.
*
* @author Thomas Pantelis
*/
@Beta
public class ConcurrentDOMDataBroker extends AbstractDOMBroker {
private static final Logger LOG = LoggerFactory.getLogger(ConcurrentDOMDataBroker.class);
private static final String CAN_COMMIT = "CAN_COMMIT";
private static final String PRE_COMMIT = "PRE_COMMIT";
private static final String COMMIT = "COMMIT";
private final DurationStatisticsTracker commitStatsTracker;
/**
* This executor is used to execute Future listener callback Runnables async.
*/
private final Executor clientFutureCallbackExecutor;
public ConcurrentDOMDataBroker(final Map datastores,
final Executor listenableFutureExecutor) {
this(datastores, listenableFutureExecutor, DurationStatisticsTracker.createConcurrent());
}
public ConcurrentDOMDataBroker(final Map datastores,
final Executor listenableFutureExecutor, final DurationStatisticsTracker commitStatsTracker) {
super(datastores);
clientFutureCallbackExecutor = requireNonNull(listenableFutureExecutor);
this.commitStatsTracker = requireNonNull(commitStatsTracker);
}
public DurationStatisticsTracker getCommitStatsTracker() {
return commitStatsTracker;
}
@Override
protected FluentFuture commit(final DOMDataTreeWriteTransaction transaction,
final DOMStoreThreePhaseCommitCohort cohort) {
checkArgument(transaction != null, "Transaction must not be null.");
checkArgument(cohort != null, "Cohorts must not be null.");
LOG.debug("Tx: {} is submitted for execution.", transaction.getIdentifier());
final AsyncNotifyingSettableFuture clientSubmitFuture =
new AsyncNotifyingSettableFuture(clientFutureCallbackExecutor);
doCanCommit(clientSubmitFuture, transaction, cohort);
return FluentFuture.from(clientSubmitFuture);
}
private void doCanCommit(final AsyncNotifyingSettableFuture clientSubmitFuture,
final DOMDataTreeWriteTransaction transaction,
final DOMStoreThreePhaseCommitCohort cohort) {
final long startTime = System.nanoTime();
Futures.addCallback(cohort.canCommit(), new FutureCallback<>() {
@Override
public void onSuccess(final Boolean result) {
if (result == null || !result) {
onFailure(new TransactionCommitFailedException("Can Commit failed, no detailed cause available."));
} else {
doPreCommit(startTime, clientSubmitFuture, transaction, cohort);
}
}
@Override
public void onFailure(final Throwable failure) {
handleException(clientSubmitFuture, transaction, cohort, CAN_COMMIT, CAN_COMMIT_ERROR_MAPPER, failure);
}
}, MoreExecutors.directExecutor());
}
private void doPreCommit(final long startTime, final AsyncNotifyingSettableFuture clientSubmitFuture,
final DOMDataTreeWriteTransaction transaction, final DOMStoreThreePhaseCommitCohort cohort) {
Futures.addCallback(cohort.preCommit(), new FutureCallback<>() {
@Override
public void onSuccess(final Empty result) {
doCommit(startTime, clientSubmitFuture, transaction, cohort);
}
@Override
public void onFailure(final Throwable failure) {
handleException(clientSubmitFuture, transaction, cohort, PRE_COMMIT, PRE_COMMIT_MAPPER, failure);
}
}, MoreExecutors.directExecutor());
}
private void doCommit(final long startTime, final AsyncNotifyingSettableFuture clientSubmitFuture,
final DOMDataTreeWriteTransaction transaction, final DOMStoreThreePhaseCommitCohort cohort) {
Futures.addCallback(cohort.commit(), new FutureCallback() {
@Override
public void onSuccess(final CommitInfo result) {
commitStatsTracker.addDuration(System.nanoTime() - startTime);
clientSubmitFuture.set();
}
@Override
public void onFailure(final Throwable throwable) {
handleException(clientSubmitFuture, transaction, cohort, COMMIT, COMMIT_ERROR_MAPPER, throwable);
}
}, MoreExecutors.directExecutor());
}
private static void handleException(final AsyncNotifyingSettableFuture clientSubmitFuture,
final DOMDataTreeWriteTransaction transaction, final DOMStoreThreePhaseCommitCohort cohort,
final String phase, final TransactionCommitFailedExceptionMapper exMapper, final Throwable throwable) {
if (clientSubmitFuture.isDone()) {
// We must have had failures from multiple cohorts.
return;
}
// Use debug instead of warn level here because this exception gets propagate back to the caller via the Future
LOG.debug("Tx: {} Error during phase {}, starting Abort", transaction.getIdentifier(), phase, throwable);
// Propagate the original exception
final Exception e;
if (throwable instanceof NoShardLeaderException || throwable instanceof ShardLeaderNotRespondingException) {
e = new DataStoreUnavailableException(throwable.getMessage(), throwable);
} else if (throwable instanceof Exception) {
e = (Exception) throwable;
} else {
e = new RuntimeException("Unexpected error occurred", throwable);
}
clientSubmitFuture.setException(exMapper.apply(e));
// abort
Futures.addCallback(cohort.abort(), new FutureCallback() {
@Override
public void onSuccess(final Empty result) {
// Propagate the original exception to the client.
LOG.debug("Tx: {} aborted successfully", transaction.getIdentifier());
}
@Override
public void onFailure(final Throwable failure) {
LOG.error("Tx: {} Error during Abort.", transaction.getIdentifier(), failure);
}
}, MoreExecutors.directExecutor());
}
/**
* A settable future that uses an {@link Executor} to execute listener callback Runnables,
* registered via {@link #addListener}, asynchronously when this future completes. This is
* done to guarantee listener executions are off-loaded onto another thread to avoid blocking
* the thread that completed this future, as a common use case is to pass an executor that runs
* tasks in the same thread as the caller (ie MoreExecutors#sameThreadExecutor)
* to {@link #addListener}.
* FIXME: This class should probably be moved to yangtools common utils for re-usability and
* unified with AsyncNotifyingListenableFutureTask.
*/
private static class AsyncNotifyingSettableFuture extends AbstractFuture {
/**
* ThreadLocal used to detect if the task completion thread is running the future listener Runnables.
*/
private static final ThreadLocal ON_TASK_COMPLETION_THREAD_TL = new ThreadLocal<>();
private final Executor listenerExecutor;
AsyncNotifyingSettableFuture(final Executor listenerExecutor) {
this.listenerExecutor = requireNonNull(listenerExecutor);
}
@Override
public void addListener(final Runnable listener, final Executor executor) {
// Wrap the listener Runnable in a DelegatingRunnable. If the specified executor is one
// that runs tasks in the same thread as the caller submitting the task
// (e.g. {@link com.google.common.util.concurrent.MoreExecutors#sameThreadExecutor}) and
// the listener is executed from the #set methods, then the DelegatingRunnable will detect
// this via the ThreadLocal and submit the listener Runnable to the listenerExecutor.
//
// On the other hand, if this task is already complete, the call to ExecutionList#add in
// superclass will execute the listener Runnable immediately and, since the ThreadLocal
// won't be set, the DelegatingRunnable will run the listener Runnable inline.
super.addListener(new DelegatingRunnable(listener, listenerExecutor), executor);
}
boolean set() {
ON_TASK_COMPLETION_THREAD_TL.set(Boolean.TRUE);
try {
return super.set(CommitInfo.empty());
} finally {
ON_TASK_COMPLETION_THREAD_TL.set(null);
}
}
@Override
protected boolean setException(final Throwable throwable) {
ON_TASK_COMPLETION_THREAD_TL.set(Boolean.TRUE);
try {
return super.setException(throwable);
} finally {
ON_TASK_COMPLETION_THREAD_TL.set(null);
}
}
private static final class DelegatingRunnable implements Runnable {
private final Runnable delegate;
private final Executor executor;
DelegatingRunnable(final Runnable delegate, final Executor executor) {
this.delegate = requireNonNull(delegate);
this.executor = requireNonNull(executor);
}
@Override
public void run() {
if (ON_TASK_COMPLETION_THREAD_TL.get() != null) {
// We're running on the task completion thread so off-load to the executor.
LOG.trace("Submitting ListenenableFuture Runnable from thread {} to executor {}",
Thread.currentThread().getName(), executor);
executor.execute(delegate);
} else {
// We're not running on the task completion thread so run the delegate inline.
LOG.trace("Executing ListenenableFuture Runnable on this thread: {}",
Thread.currentThread().getName());
delegate.run();
}
}
}
}
@Override
public String toString() {
return "Clustered ConcurrentDOMDataBroker";
}
}
