com.alipay.disruptor.TimeoutBlockingWaitStrategy Maven / Gradle / Ivy
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/*
* Copyright 2011 LMAX Ltd.
*
* 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.alipay.disruptor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class TimeoutBlockingWaitStrategy implements WaitStrategy {
private final Lock lock = new ReentrantLock();
private final Condition processorNotifyCondition = lock.newCondition();
private final long timeoutInNanos;
public TimeoutBlockingWaitStrategy(final long timeout, final TimeUnit units) {
timeoutInNanos = units.toNanos(timeout);
}
@Override
public long waitFor(final long sequence, final Sequence cursorSequence,
final Sequence dependentSequence, final SequenceBarrier barrier)
throws AlertException,
InterruptedException,
TimeoutException {
long nanos = timeoutInNanos;
long availableSequence;
if (cursorSequence.get() < sequence) {
lock.lock();
try {
while (cursorSequence.get() < sequence) {
barrier.checkAlert();
nanos = processorNotifyCondition.awaitNanos(nanos);
if (nanos <= 0) {
throw TimeoutException.INSTANCE;
}
}
} finally {
lock.unlock();
}
}
while ((availableSequence = dependentSequence.get()) < sequence) {
barrier.checkAlert();
}
return availableSequence;
}
@Override
public void signalAllWhenBlocking() {
lock.lock();
try {
processorNotifyCondition.signalAll();
} finally {
lock.unlock();
}
}
@Override
public String toString() {
return "TimeoutBlockingWaitStrategy{" + "processorNotifyCondition="
+ processorNotifyCondition + '}';
}
}