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* Copyright 2009 Red Hat Inc. and/or its affiliates and other
* contributors as indicated by the @author tags. All rights reserved.
* See the copyright.txt in the distribution for a full listing of
* individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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*/
package org.infinispan.interceptors;
import org.infinispan.commands.CommandsFactory;
import org.infinispan.commands.tx.CommitCommand;
import org.infinispan.commands.tx.PrepareCommand;
import org.infinispan.commands.tx.RollbackCommand;
import org.infinispan.commands.write.ClearCommand;
import org.infinispan.commands.write.PutKeyValueCommand;
import org.infinispan.commands.write.PutMapCommand;
import org.infinispan.commands.write.RemoveCommand;
import org.infinispan.commands.write.ReplaceCommand;
import org.infinispan.commands.write.WriteCommand;
import org.infinispan.config.Configuration;
import org.infinispan.context.InvocationContext;
import org.infinispan.context.impl.TxInvocationContext;
import org.infinispan.factories.annotations.Inject;
import org.infinispan.interceptors.base.BaseRpcInterceptor;
import org.infinispan.remoting.responses.Response;
import org.infinispan.remoting.responses.SuccessfulResponse;
import org.infinispan.remoting.transport.Address;
import org.infinispan.statetransfer.StateTransferLock;
import org.infinispan.util.concurrent.NotifyingFutureImpl;
import org.infinispan.util.concurrent.NotifyingNotifiableFuture;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeoutException;
/**
* Takes care of replicating modifications to other caches in a cluster.
*
* @author Bela Ban
* @since 4.0
*/
public class ReplicationInterceptor extends BaseRpcInterceptor {
private StateTransferLock stateTransferLock;
private CommandsFactory cf;
@Inject
public void init(StateTransferLock stateTransferLock, CommandsFactory cf) {
this.stateTransferLock = stateTransferLock;
this.cf = cf;
}
@Override
public Object visitCommitCommand(TxInvocationContext ctx, CommitCommand command) throws Throwable {
if (!ctx.isInTxScope()) throw new IllegalStateException("This should not be possible!");
if (shouldInvokeRemoteTxCommand(ctx)) {
stateTransferLock.waitForStateTransferToEnd(ctx, command, -1);
sendCommitCommand(ctx, command);
}
return invokeNextInterceptor(ctx, command);
}
/**
* If the response to a commit is a request to resend the prepare, respond accordingly *
*/
private boolean needToResendPrepare(Response r) {
return r instanceof SuccessfulResponse && Byte.valueOf(CommitCommand.RESEND_PREPARE).equals(((SuccessfulResponse) r).getResponseValue());
}
private void sendCommitCommand(TxInvocationContext ctx, CommitCommand command)
throws TimeoutException, InterruptedException {
// may need to resend, so make the commit command synchronous
// TODO keep the list of prepared nodes or the view id when the prepare command was sent to know whether we need to resend the prepare info
Map<Address, Response> responses = rpcManager.invokeRemotely(null, command, configuration.isSyncCommitPhase(), true);
if (!responses.isEmpty()) {
List<Address> resendTo = new LinkedList<Address>();
for (Map.Entry<Address, Response> r : responses.entrySet()) {
if (needToResendPrepare(r.getValue()))
resendTo.add(r.getKey());
}
if (!resendTo.isEmpty()) {
log.debugf("Need to resend prepares for %s to %s", command.getGlobalTransaction(), resendTo);
// Make sure this is 1-Phase!!
PrepareCommand pc = cf.buildPrepareCommand(command.getGlobalTransaction(), ctx.getModifications(), true);
rpcManager.invokeRemotely(resendTo, pc, true, true);
}
}
}
@Override
public Object visitPrepareCommand(TxInvocationContext ctx, PrepareCommand command) throws Throwable {
Object retVal = invokeNextInterceptor(ctx, command);
if (shouldInvokeRemoteTxCommand(ctx)) {
stateTransferLock.waitForStateTransferToEnd(ctx, command, -1);
broadcastPrepare(ctx, command);
}
return retVal;
}
protected void broadcastPrepare(TxInvocationContext context, PrepareCommand command) {
boolean async = configuration.getCacheMode() == Configuration.CacheMode.REPL_ASYNC;
rpcManager.broadcastRpcCommand(command, !async, false);
}
@Override
public Object visitRollbackCommand(TxInvocationContext ctx, RollbackCommand command) throws Throwable {
if (shouldInvokeRemoteTxCommand(ctx) && !configuration.isOnePhaseCommit()) {
rpcManager.broadcastRpcCommand(command, configuration.isSyncRollbackPhase(), true);
}
return invokeNextInterceptor(ctx, command);
}
@Override
public Object visitPutKeyValueCommand(InvocationContext ctx, PutKeyValueCommand command) throws Throwable {
return handleCrudMethod(ctx, command);
}
@Override
public Object visitPutMapCommand(InvocationContext ctx, PutMapCommand command) throws Throwable {
return handleCrudMethod(ctx, command);
}
@Override
public Object visitRemoveCommand(InvocationContext ctx, RemoveCommand command) throws Throwable {
return handleCrudMethod(ctx, command);
}
@Override
public Object visitClearCommand(InvocationContext ctx, ClearCommand command) throws Throwable {
return handleCrudMethod(ctx, command);
}
@Override
public Object visitReplaceCommand(InvocationContext ctx, ReplaceCommand command) throws Throwable {
return handleCrudMethod(ctx, command);
}
/**
* If we are within one transaction we won't do any replication as replication would only be performed at commit
* time. If the operation didn't originate locally we won't do any replication either.
*/
private Object handleCrudMethod(final InvocationContext ctx, final WriteCommand command) throws Throwable {
// FIRST pass this call up the chain. Only if it succeeds (no exceptions) locally do we attempt to replicate.
final Object returnValue = invokeNextInterceptor(ctx, command);
populateCommandFlags(command, ctx);
if (!isLocalModeForced(ctx) && command.isSuccessful() && ctx.isOriginLocal() && !ctx.isInTxScope()) {
stateTransferLock.waitForStateTransferToEnd(ctx, command, -1);
if (ctx.isUseFutureReturnType()) {
NotifyingNotifiableFuture<Object> future = new NotifyingFutureImpl(returnValue);
rpcManager.broadcastRpcCommandInFuture(command, future);
return future;
} else {
rpcManager.broadcastRpcCommand(command, isSynchronous(ctx));
}
}
return returnValue;
}
/**
* Makes sure the context Flags are bundled in the command, so that they are re-read remotely
*/
private void populateCommandFlags(WriteCommand command, InvocationContext ctx) {
command.setFlags(ctx.getFlags());
}
}