bitronix.tm.twopc.Committer Maven / Gradle / Ivy
/*
* Bitronix Transaction Manager
*
* Copyright (c) 2010, Bitronix Software.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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 distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package bitronix.tm.twopc;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import bitronix.tm.BitronixTransaction;
import bitronix.tm.utils.Decoder;
import bitronix.tm.twopc.executor.Executor;
import bitronix.tm.twopc.executor.Job;
import bitronix.tm.internal.*;
import javax.transaction.HeuristicMixedException;
import javax.transaction.HeuristicRollbackException;
import javax.transaction.Status;
import javax.transaction.xa.XAException;
import java.util.List;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Collections;
/**
* Phase 2 Commit logic engine.
*
* @author lorban
*/
public class Committer extends AbstractPhaseEngine {
private final static Logger log = LoggerFactory.getLogger(Committer.class);
private boolean onePhase;
private List interestedResources;
// this list has to be thread-safe as the CommitJobs can be executed in parallel (when async 2PC is configured)
private final List committedResources = Collections.synchronizedList(new ArrayList());
public Committer(Executor executor) {
super(executor);
}
/**
* Execute phase 2 commit.
* @param transaction the transaction wanting to commit phase 2
* @param interestedResources a map of phase 1 prepared resources wanting to participate in phase 2 using Xids as keys
* @throws HeuristicRollbackException when all resources committed instead.
* @throws HeuristicMixedException when some resources committed and some rolled back.
* @throws bitronix.tm.internal.BitronixSystemException when an internal error occured.
*/
public void commit(BitronixTransaction transaction, List interestedResources) throws HeuristicMixedException, HeuristicRollbackException, BitronixSystemException {
XAResourceManager resourceManager = transaction.getResourceManager();
if (resourceManager.size() == 0) {
transaction.setStatus(Status.STATUS_COMMITTING); //TODO: there is a disk force here that could be avoided
transaction.setStatus(Status.STATUS_COMMITTED);
if (log.isDebugEnabled()) log.debug("phase 2 commit succeeded with no interested resource");
return;
}
transaction.setStatus(Status.STATUS_COMMITTING);
this.interestedResources = Collections.unmodifiableList(interestedResources);
this.onePhase = resourceManager.size() == 1;
try {
executePhase(resourceManager, true);
} catch (PhaseException ex) {
logFailedResources(ex);
transaction.setStatus(Status.STATUS_UNKNOWN);
throwException("transaction failed during commit of " + transaction, ex, interestedResources.size());
}
if (log.isDebugEnabled()) log.debug("phase 2 commit executed on resources " + Decoder.collectResourcesNames(committedResources));
// Some resources might have failed the 2nd phase of 2PC.
// Only resources which successfully committed should be registered in the journal, the other
// ones should be picked up by the recoverer.
// Not interested resources have to be included as well since they returned XA_RDONLY and they
// don't participate in phase 2: the TX succeded for them.
List committedAndNotInterestedUniqueNames = new ArrayList();
committedAndNotInterestedUniqueNames.addAll(collectResourcesUniqueNames(committedResources));
List notInterestedResources = collectNotInterestedResources(resourceManager.getAllResources(), interestedResources);
committedAndNotInterestedUniqueNames.addAll(collectResourcesUniqueNames(notInterestedResources));
if (log.isDebugEnabled()) {
List committedAndNotInterestedResources = new ArrayList();
committedAndNotInterestedResources.addAll(committedResources);
committedAndNotInterestedResources.addAll(notInterestedResources);
log.debug("phase 2 commit succeeded on resources " + Decoder.collectResourcesNames(committedAndNotInterestedResources));
}
transaction.setStatus(Status.STATUS_COMMITTED, new HashSet(committedAndNotInterestedUniqueNames));
}
private void throwException(String message, PhaseException phaseException, int totalResourceCount) throws HeuristicMixedException, HeuristicRollbackException {
List exceptions = phaseException.getExceptions();
List resources = phaseException.getResourceStates();
boolean hazard = false;
List heuristicResources = new ArrayList();
List errorResources = new ArrayList();
for (int i = 0; i < exceptions.size(); i++) {
Exception ex = (Exception) exceptions.get(i);
XAResourceHolderState resourceHolder = (XAResourceHolderState) resources.get(i);
if (ex instanceof XAException) {
XAException xaEx = (XAException) ex;
switch (xaEx.errorCode) {
case XAException.XA_HEURHAZ:
hazard = true;
case XAException.XA_HEURCOM:
case XAException.XA_HEURRB:
case XAException.XA_HEURMIX:
heuristicResources.add(resourceHolder);
break;
default:
errorResources.add(resourceHolder);
}
}
else
errorResources.add(resourceHolder);
}
if (!hazard && heuristicResources.size() == totalResourceCount)
throw new BitronixHeuristicRollbackException(message + ":" +
" all resource(s) " + Decoder.collectResourcesNames(heuristicResources) +
" improperly unilaterally rolled back", phaseException);
else
throw new BitronixHeuristicMixedException(message + ":" +
(errorResources.size() > 0 ? " resource(s) " + Decoder.collectResourcesNames(errorResources) + " threw unexpected exception" : "") +
(errorResources.size() > 0 && heuristicResources.size() > 0 ? " and" : "") +
(heuristicResources.size() > 0 ? " resource(s) " + Decoder.collectResourcesNames(heuristicResources) + " improperly unilaterally rolled back" + (hazard ? " (or hazard happened)" : "") : ""), phaseException);
}
protected Job createJob(XAResourceHolderState resourceHolder) {
return new CommitJob(resourceHolder);
}
protected boolean isParticipating(XAResourceHolderState xaResourceHolderState) {
for (int i = 0; i < interestedResources.size(); i++) {
XAResourceHolderState resourceHolderState = (XAResourceHolderState) interestedResources.get(i);
if (xaResourceHolderState == resourceHolderState)
return true;
}
return false;
}
private class CommitJob extends Job {
public CommitJob(XAResourceHolderState resourceHolder) {
super(resourceHolder);
}
public XAException getXAException() {
return xaException;
}
public RuntimeException getRuntimeException() {
return runtimeException;
}
public void execute() {
try {
commitResource(getResource(), onePhase);
} catch (RuntimeException ex) {
runtimeException = ex;
} catch (XAException ex) {
xaException = ex;
}
}
private void commitResource(XAResourceHolderState resourceHolder, boolean onePhase) throws XAException {
try {
if (log.isDebugEnabled()) log.debug("committing resource " + resourceHolder + (onePhase ? " (with one-phase optimization)" : ""));
resourceHolder.getXAResource().commit(resourceHolder.getXid(), onePhase);
committedResources.add(resourceHolder);
if (log.isDebugEnabled()) log.debug("committed resource " + resourceHolder);
} catch (XAException ex) {
handleXAException(resourceHolder, ex);
}
}
private void handleXAException(XAResourceHolderState failedResourceHolder, XAException xaException) throws XAException {
switch (xaException.errorCode) {
case XAException.XA_HEURCOM:
forgetHeuristicCommit(failedResourceHolder);
return;
case XAException.XAER_NOTA:
throw new BitronixXAException("unknown heuristic termination, global state of this transaction is unknown - guilty: " + failedResourceHolder, XAException.XA_HEURHAZ, xaException);
case XAException.XA_HEURHAZ:
case XAException.XA_HEURMIX:
case XAException.XA_HEURRB:
case XAException.XA_RBCOMMFAIL:
case XAException.XA_RBDEADLOCK:
case XAException.XA_RBINTEGRITY:
case XAException.XA_RBOTHER:
case XAException.XA_RBPROTO:
case XAException.XA_RBROLLBACK:
case XAException.XA_RBTIMEOUT:
case XAException.XA_RBTRANSIENT:
log.error("heuristic rollback is incompatible with the global state of this transaction - guilty: " + failedResourceHolder);
throw xaException;
default:
log.warn("resource '" + failedResourceHolder.getUniqueName() + "' reported " + Decoder.decodeXAExceptionErrorCode(xaException) +
" when asked to commit transaction branch. Transaction is prepared and will commit via recovery service when resource availability allows.", xaException);
}
}
private void forgetHeuristicCommit(XAResourceHolderState resourceHolder) {
try {
if (log.isDebugEnabled()) log.debug("handling heuristic commit on resource " + resourceHolder.getXAResource());
resourceHolder.getXAResource().forget(resourceHolder.getXid());
if (log.isDebugEnabled()) log.debug("forgotten heuristically committed resource " + resourceHolder.getXAResource());
} catch (XAException ex) {
log.error("cannot forget " + resourceHolder.getXid() + " assigned to " + resourceHolder.getXAResource() + ", error=" + Decoder.decodeXAExceptionErrorCode(ex), ex);
}
}
public String toString() {
return "a CommitJob " + (onePhase ? "(one phase) " : "") + "with " + getResource();
}
}
}
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