+++ /dev/null
-/*
- * Copyright (c) 2014 Cisco 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.datastore;
-
-import akka.actor.ActorSelection;
-import akka.dispatch.OnComplete;
-import com.google.common.base.Preconditions;
-import com.google.common.base.Supplier;
-import com.google.common.collect.Lists;
-import com.google.common.util.concurrent.FutureCallback;
-import com.google.common.util.concurrent.Futures;
-import com.google.common.util.concurrent.ListenableFuture;
-import com.google.common.util.concurrent.SettableFuture;
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
-import java.util.concurrent.atomic.AtomicInteger;
-import org.opendaylight.controller.cluster.datastore.messages.AbortTransaction;
-import org.opendaylight.controller.cluster.datastore.messages.AbortTransactionReply;
-import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransaction;
-import org.opendaylight.controller.cluster.datastore.messages.CanCommitTransactionReply;
-import org.opendaylight.controller.cluster.datastore.messages.CommitTransaction;
-import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
-import org.opendaylight.controller.cluster.datastore.utils.ActorContext;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import scala.concurrent.Future;
-
-/**
- * ThreePhaseCommitCohortProxy represents a set of remote cohort proxies
- */
-public class ThreePhaseCommitCohortProxy extends AbstractThreePhaseCommitCohort<ActorSelection> {
-
- private static final Logger LOG = LoggerFactory.getLogger(ThreePhaseCommitCohortProxy.class);
-
- private static final MessageSupplier COMMIT_MESSAGE_SUPPLIER = new MessageSupplier() {
- @Override
- public Object newMessage(String transactionId, short version) {
- return new CommitTransaction(transactionId, version).toSerializable();
- }
-
- @Override
- public boolean isSerializedReplyType(Object reply) {
- return CommitTransactionReply.isSerializedType(reply);
- }
- };
-
- private static final MessageSupplier ABORT_MESSAGE_SUPPLIER = new MessageSupplier() {
- @Override
- public Object newMessage(String transactionId, short version) {
- return new AbortTransaction(transactionId, version).toSerializable();
- }
-
- @Override
- public boolean isSerializedReplyType(Object reply) {
- return AbortTransactionReply.isSerializedType(reply);
- }
- };
-
- private final ActorContext actorContext;
- private final List<CohortInfo> cohorts;
- private final SettableFuture<Void> cohortsResolvedFuture = SettableFuture.create();
- private final String transactionId;
- private volatile OperationCallback commitOperationCallback;
-
- public ThreePhaseCommitCohortProxy(ActorContext actorContext, List<CohortInfo> cohorts, String transactionId) {
- this.actorContext = actorContext;
- this.cohorts = cohorts;
- this.transactionId = transactionId;
-
- if(cohorts.isEmpty()) {
- cohortsResolvedFuture.set(null);
- }
- }
-
- private ListenableFuture<Void> resolveCohorts() {
- if(cohortsResolvedFuture.isDone()) {
- return cohortsResolvedFuture;
- }
-
- final AtomicInteger completed = new AtomicInteger(cohorts.size());
- for(final CohortInfo info: cohorts) {
- info.getActorFuture().onComplete(new OnComplete<ActorSelection>() {
- @Override
- public void onComplete(Throwable failure, ActorSelection actor) {
- synchronized(completed) {
- boolean done = completed.decrementAndGet() == 0;
- if(failure != null) {
- LOG.debug("Tx {}: a cohort Future failed", transactionId, failure);
- cohortsResolvedFuture.setException(failure);
- } else if(!cohortsResolvedFuture.isDone()) {
- LOG.debug("Tx {}: cohort actor {} resolved", transactionId, actor);
-
- info.setResolvedActor(actor);
- if(done) {
- LOG.debug("Tx {}: successfully resolved all cohort actors", transactionId);
- cohortsResolvedFuture.set(null);
- }
- }
- }
- }
- }, actorContext.getClientDispatcher());
- }
-
- return cohortsResolvedFuture;
- }
-
- @Override
- public ListenableFuture<Boolean> canCommit() {
- LOG.debug("Tx {} canCommit", transactionId);
-
- final SettableFuture<Boolean> returnFuture = SettableFuture.create();
-
- // The first phase of canCommit is to gather the list of cohort actor paths that will
- // participate in the commit. buildCohortPathsList combines the cohort path Futures into
- // one Future which we wait on asynchronously here. The cohort actor paths are
- // extracted from ReadyTransactionReply messages by the Futures that were obtained earlier
- // and passed to us from upstream processing. If any one fails then we'll fail canCommit.
-
- Futures.addCallback(resolveCohorts(), new FutureCallback<Void>() {
- @Override
- public void onSuccess(Void notUsed) {
- finishCanCommit(returnFuture);
- }
-
- @Override
- public void onFailure(Throwable failure) {
- returnFuture.setException(failure);
- }
- });
-
- return returnFuture;
- }
-
- private void finishCanCommit(final SettableFuture<Boolean> returnFuture) {
- LOG.debug("Tx {} finishCanCommit", transactionId);
-
- // For empty transactions return immediately
- if(cohorts.size() == 0){
- LOG.debug("Tx {}: canCommit returning result true", transactionId);
- returnFuture.set(Boolean.TRUE);
- return;
- }
-
- commitOperationCallback = new TransactionRateLimitingCallback(actorContext);
- commitOperationCallback.run();
-
- final Iterator<CohortInfo> iterator = cohorts.iterator();
-
- final OnComplete<Object> onComplete = new OnComplete<Object>() {
- @Override
- public void onComplete(Throwable failure, Object response) {
- if (failure != null) {
- LOG.debug("Tx {}: a canCommit cohort Future failed", transactionId, failure);
-
- returnFuture.setException(failure);
- commitOperationCallback.failure();
- return;
- }
-
- // Only the first call to pause takes effect - subsequent calls before resume are no-ops. So
- // this means we'll only time the first transaction canCommit which should be fine.
- commitOperationCallback.pause();
-
- boolean result = true;
- if (CanCommitTransactionReply.isSerializedType(response)) {
- CanCommitTransactionReply reply = CanCommitTransactionReply.fromSerializable(response);
-
- LOG.debug("Tx {}: received {}", transactionId, response);
-
- if (!reply.getCanCommit()) {
- result = false;
- }
- } else {
- LOG.error("Unexpected response type {}", response.getClass());
- returnFuture.setException(new IllegalArgumentException(
- String.format("Unexpected response type %s", response.getClass())));
- return;
- }
-
- if(iterator.hasNext() && result) {
- sendCanCommitTransaction(iterator.next(), this);
- } else {
- LOG.debug("Tx {}: canCommit returning result: {}", transactionId, result);
- returnFuture.set(Boolean.valueOf(result));
- }
-
- }
- };
-
- sendCanCommitTransaction(iterator.next(), onComplete);
- }
-
- private void sendCanCommitTransaction(CohortInfo toCohortInfo, OnComplete<Object> onComplete) {
- CanCommitTransaction message = new CanCommitTransaction(transactionId, toCohortInfo.getActorVersion());
-
- if(LOG.isDebugEnabled()) {
- LOG.debug("Tx {}: sending {} to {}", transactionId, message, toCohortInfo.getResolvedActor());
- }
-
- Future<Object> future = actorContext.executeOperationAsync(toCohortInfo.getResolvedActor(),
- message.toSerializable(), actorContext.getTransactionCommitOperationTimeout());
- future.onComplete(onComplete, actorContext.getClientDispatcher());
- }
-
- private Future<Iterable<Object>> invokeCohorts(MessageSupplier messageSupplier) {
- List<Future<Object>> futureList = Lists.newArrayListWithCapacity(cohorts.size());
- for(CohortInfo cohort : cohorts) {
- Object message = messageSupplier.newMessage(transactionId, cohort.getActorVersion());
-
- if(LOG.isDebugEnabled()) {
- LOG.debug("Tx {}: Sending {} to cohort {}", transactionId, message , cohort);
- }
-
- futureList.add(actorContext.executeOperationAsync(cohort.getResolvedActor(), message,
- actorContext.getTransactionCommitOperationTimeout()));
- }
-
- return akka.dispatch.Futures.sequence(futureList, actorContext.getClientDispatcher());
- }
-
- @Override
- public ListenableFuture<Void> preCommit() {
- // We don't need to do anything here - preCommit is done atomically with the commit phase
- // by the shard.
- return IMMEDIATE_VOID_SUCCESS;
- }
-
- @Override
- public ListenableFuture<Void> abort() {
- // Note - we pass false for propagateException. In the front-end data broker, this method
- // is called when one of the 3 phases fails with an exception. We'd rather have that
- // original exception propagated to the client. If our abort fails and we propagate the
- // exception then that exception will supersede and suppress the original exception. But
- // it's the original exception that is the root cause and of more interest to the client.
-
- return voidOperation("abort", ABORT_MESSAGE_SUPPLIER,
- AbortTransactionReply.class, false, OperationCallback.NO_OP_CALLBACK);
- }
-
- @Override
- public ListenableFuture<Void> commit() {
- OperationCallback operationCallback = commitOperationCallback != null ? commitOperationCallback :
- OperationCallback.NO_OP_CALLBACK;
-
- return voidOperation("commit", COMMIT_MESSAGE_SUPPLIER,
- CommitTransactionReply.class, true, operationCallback);
- }
-
- private boolean successfulFuture(ListenableFuture<Void> future) {
- if(!future.isDone()) {
- return false;
- }
-
- try {
- future.get();
- return true;
- } catch(Exception e) {
- return false;
- }
- }
-
- private ListenableFuture<Void> voidOperation(final String operationName,
- final MessageSupplier messageSupplier, final Class<?> expectedResponseClass,
- final boolean propagateException, final OperationCallback callback) {
- LOG.debug("Tx {} {}", transactionId, operationName);
-
- final SettableFuture<Void> returnFuture = SettableFuture.create();
-
- // The cohort actor list should already be built at this point by the canCommit phase but,
- // if not for some reason, we'll try to build it here.
-
- ListenableFuture<Void> future = resolveCohorts();
- if(successfulFuture(future)) {
- finishVoidOperation(operationName, messageSupplier, expectedResponseClass, propagateException,
- returnFuture, callback);
- } else {
- Futures.addCallback(future, new FutureCallback<Void>() {
- @Override
- public void onSuccess(Void notUsed) {
- finishVoidOperation(operationName, messageSupplier, expectedResponseClass,
- propagateException, returnFuture, callback);
- }
-
- @Override
- public void onFailure(Throwable failure) {
- LOG.debug("Tx {}: a {} cohort path Future failed: {}", transactionId, operationName, failure);
-
- if(propagateException) {
- returnFuture.setException(failure);
- } else {
- returnFuture.set(null);
- }
- }
- });
- }
-
- return returnFuture;
- }
-
- private void finishVoidOperation(final String operationName, MessageSupplier messageSupplier,
- final Class<?> expectedResponseClass, final boolean propagateException,
- final SettableFuture<Void> returnFuture, final OperationCallback callback) {
- LOG.debug("Tx {} finish {}", transactionId, operationName);
-
- callback.resume();
-
- Future<Iterable<Object>> combinedFuture = invokeCohorts(messageSupplier);
-
- combinedFuture.onComplete(new OnComplete<Iterable<Object>>() {
- @Override
- public void onComplete(Throwable failure, Iterable<Object> responses) throws Throwable {
- Throwable exceptionToPropagate = failure;
- if(exceptionToPropagate == null) {
- for(Object response: responses) {
- if(!response.getClass().equals(expectedResponseClass)) {
- exceptionToPropagate = new IllegalArgumentException(
- String.format("Unexpected response type %s", response.getClass()));
- break;
- }
- }
- }
-
- if(exceptionToPropagate != null) {
- LOG.debug("Tx {}: a {} cohort Future failed", transactionId, operationName, exceptionToPropagate);
- if(propagateException) {
- // We don't log the exception here to avoid redundant logging since we're
- // propagating to the caller in MD-SAL core who will log it.
- returnFuture.setException(exceptionToPropagate);
- } else {
- // Since the caller doesn't want us to propagate the exception we'll also
- // not log it normally. But it's usually not good to totally silence
- // exceptions so we'll log it to debug level.
- returnFuture.set(null);
- }
-
- callback.failure();
- } else {
- LOG.debug("Tx {}: {} succeeded", transactionId, operationName);
-
- returnFuture.set(null);
-
- callback.success();
- }
- }
- }, actorContext.getClientDispatcher());
- }
-
- @Override
- List<Future<ActorSelection>> getCohortFutures() {
- List<Future<ActorSelection>> cohortFutures = new ArrayList<>(cohorts.size());
- for(CohortInfo info: cohorts) {
- cohortFutures.add(info.getActorFuture());
- }
-
- return cohortFutures;
- }
-
- static class CohortInfo {
- private final Future<ActorSelection> actorFuture;
- private volatile ActorSelection resolvedActor;
- private final Supplier<Short> actorVersionSupplier;
-
- CohortInfo(Future<ActorSelection> actorFuture, Supplier<Short> actorVersionSupplier) {
- this.actorFuture = actorFuture;
- this.actorVersionSupplier = actorVersionSupplier;
- }
-
- Future<ActorSelection> getActorFuture() {
- return actorFuture;
- }
-
- ActorSelection getResolvedActor() {
- return resolvedActor;
- }
-
- void setResolvedActor(ActorSelection resolvedActor) {
- this.resolvedActor = resolvedActor;
- }
-
- short getActorVersion() {
- Preconditions.checkState(resolvedActor != null,
- "getActorVersion cannot be called until the actor is resolved");
- return actorVersionSupplier.get();
- }
- }
-
- private interface MessageSupplier {
- Object newMessage(String transactionId, short version);
- boolean isSerializedReplyType(Object reply);
- }
-}
Code Review / controller.git / blobdiff