/*
* Copyright 2010 the original author or authors.
*
* 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 org.gradle.messaging.remote.internal;
import org.gradle.messaging.concurrent.Stoppable;
import org.gradle.messaging.dispatch.Dispatch;
import org.gradle.util.UncheckedException;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class EndOfStreamFilter implements Dispatch<Object>, Stoppable {
private final Dispatch<Object> dispatch;
private final Runnable endOfStreamAction;
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
private boolean endOfStreamReached;
public EndOfStreamFilter(Dispatch<Object> dispatch, Runnable endOfStreamAction) {
this.dispatch = dispatch;
this.endOfStreamAction = endOfStreamAction;
}
public void dispatch(Object message) {
lock.lock();
try {
if (endOfStreamReached) {
throw new IllegalStateException(String.format(
"Cannot dispatch message %s, as this dispatch has been stopped.", message));
}
if (message instanceof EndOfStreamEvent) {
endOfStreamReached = true;
condition.signalAll();
endOfStreamAction.run();
return;
}
} finally {
lock.unlock();
}
dispatch.dispatch(message);
}
public void stop() {
lock.lock();
try {
while (!endOfStreamReached) {
try {
condition.await();
} catch (InterruptedException e) {
throw new UncheckedException(e);
}
}
} finally {
lock.unlock();
}
}
}