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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License. You may obtain a
* copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package org.apache.geode.internal.cache.tx;
import org.apache.geode.cache.CommitConflictException;
import org.apache.geode.cache.TransactionDataNodeHasDepartedException;
import org.apache.geode.cache.TransactionException;
import org.apache.geode.cache.TransactionInDoubtException;
import org.apache.geode.cache.client.internal.ServerRegionDataAccess;
import org.apache.geode.cache.client.internal.ServerRegionProxy;
import org.apache.geode.distributed.DistributedMember;
import org.apache.geode.distributed.internal.DM;
import org.apache.geode.distributed.internal.DistributionConfig;
import org.apache.geode.distributed.internal.InternalDistributedSystem;
import org.apache.geode.distributed.internal.ServerLocation;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.internal.cache.*;
import org.apache.geode.internal.cache.locks.TXRegionLockRequest;
import org.apache.geode.internal.cache.tx.TransactionalOperation.ServerRegionOperation;
import org.apache.geode.internal.i18n.LocalizedStrings;
import org.apache.geode.internal.logging.LogService;
import org.apache.logging.log4j.Logger;
import javax.transaction.Status;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class ClientTXStateStub extends TXStateStub {
private static final Logger logger = LogService.getLogger();
// /** a flag to turn off automatic replay of transactions. Maybe this should be a pool property?
// */
// private static final boolean ENABLE_REPLAY =
// Boolean.getBoolean("gemfire.enable-transaction-replay");
//
// /** time to pause between transaction replays, in millis */
// private static final int TRANSACTION_REPLAY_PAUSE =
// Integer.getInteger("gemfire.transaction-replay-pause", 500).intValue();
/** test hook - used to find out what operations were performed in the last tx */
private static ThreadLocal> recordedTransactionalOperations = null;
private final ServerRegionProxy firstProxy;
private ServerLocation serverAffinityLocation;
/** the operations performed in the current transaction are held in this list */
private List recordedOperations =
Collections.synchronizedList(new LinkedList());
/** lock request for obtaining local locks */
private TXLockRequest lockReq;
private Runnable internalAfterLocalLocks;
/**
* System property to disable conflict checks on clients.
*/
private static final boolean DISABLE_CONFLICT_CHECK_ON_CLIENT =
Boolean.getBoolean(DistributionConfig.GEMFIRE_PREFIX + "disableConflictChecksOnClient");
/**
* @return true if transactional operation recording is enabled (test hook)
*/
public static boolean transactionRecordingEnabled() {
return !DISABLE_CONFLICT_CHECK_ON_CLIENT || recordedTransactionalOperations != null;
}
/**
* test hook
*
* @param t a ThreadLocal to hold lists of TransactionalOperations
*/
public static void setTransactionalOperationContainer(
ThreadLocal> t) {
recordedTransactionalOperations = t;
}
public ClientTXStateStub(TXStateProxy stateProxy, DistributedMember target,
LocalRegion firstRegion) {
super(stateProxy, target);
firstProxy = firstRegion.getServerProxy();
this.firstProxy.getPool().setupServerAffinity(true);
if (recordedTransactionalOperations != null) {
recordedTransactionalOperations.set(this.recordedOperations);
}
}
@Override
public void commit() throws CommitConflictException {
obtainLocalLocks();
try {
TXCommitMessage txcm = firstProxy.commit(proxy.getTxId().getUniqId());
afterServerCommit(txcm);
} catch (TransactionDataNodeHasDepartedException e) {
throw new TransactionInDoubtException(e);
} finally {
lockReq.releaseLocal();
this.firstProxy.getPool().releaseServerAffinity();
}
}
/**
* Lock the keys in a local transaction manager
*
* @throws CommitConflictException if the key is already locked by some other transaction
*/
private void obtainLocalLocks() {
lockReq = new TXLockRequest();
GemFireCacheImpl cache = GemFireCacheImpl.getExisting("");
for (TransactionalOperation txOp : this.recordedOperations) {
if (ServerRegionOperation.lockKeyForTx(txOp.getOperation())) {
TXRegionLockRequest rlr = lockReq.getRegionLockRequest(txOp.getRegionName());
if (rlr == null) {
rlr = new TXRegionLockRequestImpl(cache.getRegionByPath(txOp.getRegionName()));
lockReq.addLocalRequest(rlr);
}
if (txOp.getOperation() == ServerRegionOperation.PUT_ALL
|| txOp.getOperation() == ServerRegionOperation.REMOVE_ALL) {
rlr.addEntryKeys(txOp.getKeys());
} else {
rlr.addEntryKey(txOp.getKey());
}
}
}
if (logger.isDebugEnabled()) {
logger.debug("TX: client localLockRequest: {}", lockReq);
}
try {
lockReq.obtain();
} catch (CommitConflictException e) {
rollback(); // cleanup tx artifacts on server
throw e;
}
if (internalAfterLocalLocks != null) {
internalAfterLocalLocks.run();
}
}
/** perform local cache modifications using the server's TXCommitMessage */
private void afterServerCommit(TXCommitMessage txcm) {
if (this.internalAfterSendCommit != null) {
this.internalAfterSendCommit.run();
}
GemFireCacheImpl cache = GemFireCacheImpl.getInstance();
if (cache == null) {
// fixes bug 42933
return;
}
cache.getCancelCriterion().checkCancelInProgress(null);
InternalDistributedSystem ds = cache.getDistributedSystem();
DM dm = ds.getDistributionManager();
txcm.setDM(dm);
txcm.setAckRequired(false);
txcm.setDisableListeners(true);
cache.getTxManager().setTXState(null);
txcm.hookupRegions(dm);
txcm.basicProcess();
}
@Override
protected TXRegionStub generateRegionStub(LocalRegion region) {
return new ClientTXRegionStub(region);
}
@Override
protected void validateRegionCanJoinTransaction(LocalRegion region) throws TransactionException {
if (!region.hasServerProxy()) {
throw new TransactionException("Region " + region.getName()
+ " is local to this client and cannot be used in a transaction.");
} else if (this.firstProxy != null
&& this.firstProxy.getPool() != region.getServerProxy().getPool()) {
throw new TransactionException("Region " + region.getName()
+ " is using a different server pool than other regions in this transaction.");
}
}
@Override
public void rollback() {
if (this.internalAfterSendRollback != null) {
this.internalAfterSendRollback.run();
}
try {
this.firstProxy.rollback(proxy.getTxId().getUniqId());
} finally {
this.firstProxy.getPool().releaseServerAffinity();
}
}
@Override
public void afterCompletion(int status) {
try {
TXCommitMessage txcm = this.firstProxy.afterCompletion(status, proxy.getTxId().getUniqId());
if (status == Status.STATUS_COMMITTED) {
if (txcm == null) {
throw new TransactionInDoubtException(
LocalizedStrings.ClientTXStateStub_COMMIT_FAILED_ON_SERVER.toLocalizedString());
} else {
afterServerCommit(txcm);
}
} else if (status == Status.STATUS_ROLLEDBACK) {
if (this.internalAfterSendRollback != null) {
this.internalAfterSendRollback.run();
}
this.firstProxy.getPool().releaseServerAffinity();
}
} finally {
if (status == Status.STATUS_COMMITTED) {
// rollback does not grab locks
this.lockReq.releaseLocal();
}
this.firstProxy.getPool().releaseServerAffinity();
}
}
@Override
public void beforeCompletion() {
obtainLocalLocks();
this.firstProxy.beforeCompletion(proxy.getTxId().getUniqId());
}
public InternalDistributedMember getOriginatingMember() {
/*
* Client member id is implied from the connection so we don't need this
*/
return null;
}
public boolean isMemberIdForwardingRequired() {
/*
* Client member id is implied from the connection so we don't need this Forwarding will occur
* on the server-side stub
*/
return false;
}
public TXCommitMessage getCommitMessage() {
/* client gets the txcommit message during Op processing and doesn't need it here */
return null;
}
public void suspend() {
this.serverAffinityLocation = this.firstProxy.getPool().getServerAffinityLocation();
this.firstProxy.getPool().releaseServerAffinity();
if (logger.isDebugEnabled()) {
logger.debug("TX: suspending transaction: {} server delegate: {}", getTransactionId(),
this.serverAffinityLocation);
}
}
public void resume() {
this.firstProxy.getPool().setupServerAffinity(true);
this.firstProxy.getPool().setServerAffinityLocation(this.serverAffinityLocation);
if (logger.isDebugEnabled()) {
logger.debug("TX: resuming transaction: {} server delegate: {}", getTransactionId(),
this.serverAffinityLocation);
}
}
/**
* test hook - maintain a list of tx operations
*/
public void recordTXOperation(ServerRegionDataAccess region, ServerRegionOperation op, Object key,
Object arguments[]) {
if (ClientTXStateStub.transactionRecordingEnabled()) {
this.recordedOperations
.add(new TransactionalOperation(this, region.getRegionName(), op, key, arguments));
}
}
/**
* Add an internal callback which is run after the the local locks are obtained
*/
public void setAfterLocalLocks(Runnable afterLocalLocks) {
this.internalAfterLocalLocks = afterLocalLocks;
}
}