/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.concurrent.lock.operations;
import com.hazelcast.concurrent.lock.ConditionKey;
import com.hazelcast.concurrent.lock.LockStoreImpl;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.spi.BackupAwareOperation;
import com.hazelcast.spi.ObjectNamespace;
import com.hazelcast.spi.Operation;
import com.hazelcast.spi.ResponseHandler;
import com.hazelcast.spi.WaitSupport;
import java.io.IOException;
public class AwaitOperation extends BaseLockOperation
implements WaitSupport, BackupAwareOperation {
private String conditionId;
private boolean firstRun;
private boolean expired;
public AwaitOperation() {
}
public AwaitOperation(ObjectNamespace namespace, Data key, long threadId, long timeout, String conditionId) {
super(namespace, key, threadId, timeout);
this.conditionId = conditionId;
}
@Override
public void beforeRun() throws Exception {
LockStoreImpl lockStore = getLockStore();
firstRun = lockStore.startAwaiting(key, conditionId, getCallerUuid(), threadId);
}
@Override
public void run() throws Exception {
LockStoreImpl lockStore = getLockStore();
if (!lockStore.lock(key, getCallerUuid(), threadId)) {
throw new IllegalMonitorStateException(
"Current thread is not owner of the lock! -> " + lockStore.getOwnerInfo(key));
}
if (expired) {
response = false;
} else {
lockStore.removeSignalKey(getWaitKey());
lockStore.removeAwait(key, conditionId, getCallerUuid(), threadId);
response = true;
}
}
@Override
public ConditionKey getWaitKey() {
return new ConditionKey(namespace.getObjectName(), key, conditionId);
}
@Override
public boolean shouldWait() {
LockStoreImpl lockStore = getLockStore();
boolean canAcquireLock = lockStore.canAcquireLock(key, getCallerUuid(), threadId);
ConditionKey signalKey = lockStore.getSignalKey(key);
if (signalKey != null && conditionId.equals(signalKey.getConditionId()) && canAcquireLock) {
return false;
}
boolean shouldWait = firstRun || !canAcquireLock;
firstRun = false;
return shouldWait;
}
@Override
public boolean shouldBackup() {
return true;
}
@Override
public Operation getBackupOperation() {
return new AwaitBackupOperation(namespace, key, threadId, conditionId, getCallerUuid());
}
@Override
public void onWaitExpire() {
expired = true;
LockStoreImpl lockStore = getLockStore();
lockStore.removeSignalKey(getWaitKey());
lockStore.removeAwait(key, conditionId, getCallerUuid(), threadId);
boolean locked = lockStore.lock(key, getCallerUuid(), threadId);
if (locked) {
ResponseHandler responseHandler = getResponseHandler();
// expired & acquired lock, send FALSE
responseHandler.sendResponse(false);
} else {
// expired but could not acquire lock, no response atm
lockStore.registerExpiredAwaitOp(this);
}
}
@Override
protected void writeInternal(ObjectDataOutput out) throws IOException {
super.writeInternal(out);
out.writeUTF(conditionId);
}
@Override
protected void readInternal(ObjectDataInput in) throws IOException {
super.readInternal(in);
conditionId = in.readUTF();
}
}