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/*
* 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.locks;
import org.apache.geode.cache.CommitConflictException;
import org.apache.geode.distributed.internal.InternalDistributedSystem;
import org.apache.geode.distributed.internal.ReplyException;
import org.apache.geode.distributed.internal.ReplyProcessor21;
import org.apache.geode.distributed.internal.locks.DLockService;
import org.apache.geode.distributed.internal.locks.LockGrantorId;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.internal.i18n.LocalizedStrings;
import org.apache.geode.internal.logging.LogService;
import org.apache.geode.internal.util.concurrent.StoppableReentrantReadWriteLock;
import org.apache.logging.log4j.Logger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
/** Provides clean separation of implementation from public facade */
public class TXLockServiceImpl extends TXLockService {
private static final Logger logger = LogService.getLogger();
/** Transaction lock requests never timeout */
private static long TIMEOUT_MILLIS = -1;
/** Transaction lock leases never expire */
private static long LEASE_MILLIS = -1;
// -------------------------------------------------------------------------
// Constructor and instance variables
// -------------------------------------------------------------------------
/** Instance of dlock service to use */
private DLockService dlock;
/**
* List of active txLockIds
*/
protected List txLockIdList = new ArrayList();
/**
* True if grantor recovery is in progress; used to keep release from waiting for
* grantor.
*/
private volatile boolean recovering = false;
/**
* Read locks are held while any txLock is held; write lock is held during grantor
* recovery.
*/
private final StoppableReentrantReadWriteLock recoveryLock;
/** The distributed system for cancellation checks. */
private final InternalDistributedSystem system;
/** Constructs new instance of transaction lock service */
TXLockServiceImpl(String name) {
InternalDistributedSystem sys = InternalDistributedSystem.getAnyInstance();
if (sys == null) {
throw new IllegalStateException(
LocalizedStrings.TXLockServiceImpl_TXLOCKSERVICE_CANNOT_BE_CREATED_UNTIL_CONNECTED_TO_DISTRIBUTED_SYSTEM
.toLocalizedString());
}
sys.getCancelCriterion().checkCancelInProgress(null);
this.system = sys;
this.recoveryLock = new StoppableReentrantReadWriteLock(sys.getCancelCriterion());
this.dlock = (DLockService) DLockService.create(name, sys, true /* distributed */,
true /* destroyOnDisconnect */, true /* automateFreeResources */);
this.dlock.setDLockRecoverGrantorMessageProcessor(new TXRecoverGrantorMessageProcessor());
this.dlock.setDLockLessorDepartureHandler(new TXLessorDepartureHandler());
}
// -------------------------------------------------------------------------
// Instance methods
// -------------------------------------------------------------------------
@Override
public boolean isLockGrantor() {
return this.dlock.isLockGrantor();
}
@Override
public void becomeLockGrantor() {
this.dlock.becomeLockGrantor();
}
@Override
public TXLockId txLock(List regionLockReqs, Set txParticipants) throws CommitConflictException {
if (regionLockReqs == null) {
throw new IllegalArgumentException(
LocalizedStrings.TXLockServiceImpl_REGIONLOCKREQS_MUST_NOT_BE_NULL.toLocalizedString());
}
Set participants = txParticipants;
if (participants == null) {
participants = Collections.EMPTY_SET;
}
boolean gotLocks = false;
TXLockId txLockId = null;
try {
synchronized (this.txLockIdList) {
txLockId = new TXLockIdImpl(this.dlock.getDistributionManager().getId());
this.txLockIdList.add(txLockId);
}
TXLockBatch batch = new TXLockBatch(txLockId, regionLockReqs, participants);
logger.debug("[TXLockServiceImpl.txLock] acquire try-locks for {}", batch);
// TODO: get a readWriteLock to make the following block atomic...
Object[] keyIfFail = new Object[1];
gotLocks = this.dlock.acquireTryLocks(batch, TIMEOUT_MILLIS, LEASE_MILLIS, keyIfFail);
if (gotLocks) { // ...otherwise race can occur between tryLocks and readLock
acquireRecoveryReadLock();
} else if (keyIfFail[0] != null) {
throw new CommitConflictException(
LocalizedStrings.TXLockServiceImpl_CONCURRENT_TRANSACTION_COMMIT_DETECTED_0
.toLocalizedString(keyIfFail[0]));
} else {
throw new CommitConflictException(
LocalizedStrings.TXLockServiceImpl_FAILED_TO_REQUEST_TRY_LOCKS_FROM_GRANTOR_0
.toLocalizedString(this.dlock.getLockGrantorId()));
}
logger.debug("[TXLockServiceImpl.txLock] gotLocks is {}, returning txLockId:{}", gotLocks,
txLockId);
return txLockId;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
logger.debug("[TXLockServiceImpl.txLock] was interrupted", e);
if (gotLocks) {
if (txLockId != null) {
synchronized (this.txLockIdList) {
this.txLockIdList.remove(txLockId);
}
}
gotLocks = false;
}
// TODO: change to be TransactionFailedException (after creating TFE)...
throw new CommitConflictException(
LocalizedStrings.TXLockServiceImpl_CONCURRENT_TRANSACTION_COMMIT_DETECTED_BECAUSE_REQUEST_WAS_INTERRUPTED
.toLocalizedString(),
e);
}
}
@Override
public void updateParticipants(TXLockId txLockId, final Set updatedParticipants) {
synchronized (this.txLockIdList) {
if (!this.txLockIdList.contains(txLockId)) {
throw new IllegalArgumentException(
LocalizedStrings.TXLockServiceImpl_INVALID_TXLOCKID_NOT_FOUND_0
.toLocalizedString(txLockId));
}
}
if (updatedParticipants == null) {
throw new IllegalArgumentException(
LocalizedStrings.TXLockServiceImpl_INVALID_UPDATEDPARTICIPANTS_NULL.toLocalizedString());
}
if (updatedParticipants.isEmpty()) {
return;
}
if (!this.recovering) { // not recovering
// Serializable grantorId = this.dlock.getLockGrantorId();
if (this.dlock.isLockGrantor()) {
// Don't need to send a message (or wait for a reply)
// logger.info("DEBUG: [TXLockServiceImpl.updateParticipants] this VM is the Grantor");
TXLockUpdateParticipantsMessage.updateParticipants(this.dlock, txLockId,
updatedParticipants);
} else { // not lock grantor
LockGrantorId lockGrantorId = txLockId.getLockGrantorId();
if (lockGrantorId == null || !this.dlock.isLockGrantorId(lockGrantorId)) {
return; // grantor is gone so we cannot update him
}
InternalDistributedMember grantorId = lockGrantorId.getLockGrantorMember();
// logger.info("DEBUG: [TXLockServiceImpl.updateParticipants] sending update message to
// Grantor " + grantorId);
ReplyProcessor21 processor =
new ReplyProcessor21(this.dlock.getDistributionManager(), grantorId);
TXLockUpdateParticipantsMessage dlup = new TXLockUpdateParticipantsMessage(txLockId,
this.dlock.getName(), updatedParticipants, processor.getProcessorId());
dlup.setRecipient(grantorId);
this.dlock.getDistributionManager().putOutgoing(dlup);
// for() loop removed for bug 36983 - you can't loop on waitForReplies()
this.dlock.getDistributionManager().getCancelCriterion().checkCancelInProgress(null);
try {
processor.waitForRepliesUninterruptibly();
} catch (ReplyException e) {
e.handleAsUnexpected();
}
} // not lock grantor
} // not recovering
}
@Override
public void release(TXLockId txLockId) {
synchronized (this.txLockIdList) {
if (!this.txLockIdList.contains(txLockId)) {
// TXLockService.destroyServices can be invoked in cache.close().
// Other P2P threads could process message such as TXCommitMessage afterwards,
// and invoke TXLockService.createDTLS(). It could create a new TXLockService
// which will have a new empty list (txLockIdList) and it will not
// contain the originally added txLockId
throw new IllegalArgumentException(
LocalizedStrings.TXLockServiceImpl_INVALID_TXLOCKID_NOT_FOUND_0
.toLocalizedString(txLockId));
}
this.dlock.releaseTryLocks(txLockId, () -> {
return this.recovering;
});
this.txLockIdList.remove(txLockId);
releaseRecoveryReadLock();
}
}
@Override
public boolean isDestroyed() {
return this.dlock.isDestroyed() || this.system.getCancelCriterion().isCancelInProgress();
}
// -------------------------------------------------------------------------
// Internal implementation methods
// -------------------------------------------------------------------------
boolean isRecovering() {
return this.recovering;
}
/** Delays grantor recovery replies until finished with locks */
void acquireRecoveryWriteLock() throws InterruptedException {
this.recovering = true;
this.recoveryLock.writeLock().lockInterruptibly();
}
void releaseRecoveryWriteLock() {
this.recoveryLock.writeLock().unlock();
this.recovering = false;
}
private void acquireRecoveryReadLock() throws InterruptedException {
this.recoveryLock.readLock().lockInterruptibly();
}
private void releaseRecoveryReadLock() {
this.recoveryLock.readLock().unlock();
}
/** Exposes the internal dlock service - Public for testing purposes */
public DLockService getInternalDistributedLockService() {
return this.dlock;
}
/** Destroys the underlying lock service in this member */
@Override
void basicDestroy() {
this.dlock.destroyAndRemove();
}
}
