br.com.objectos.way.base.util.concurrent.AbstractTimeoutScript Maven / Gradle / Ivy
/*
* Copyright 2012 Objectos, Fábrica de Software LTDA.
*
* 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 br.com.objectos.way.base.util.concurrent;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* @author [email protected] (Marcio Endo)
*/
public abstract class AbstractTimeoutScript extends AbstractScript {
private final ScheduledExecutorService timeoutExecutor;
private long timeout;
private TimeUnit unit;
public AbstractTimeoutScript(ExecutorService executor,
ScheduledExecutorService timeoutExecutor,
ConcurrentMap> map,
K key) {
super(executor, map, key);
this.timeoutExecutor = timeoutExecutor;
configureTimeout();
}
protected void onTimeout(K key) {
}
protected abstract void configureTimeout();
protected void cancelAfter(long timeout, TimeUnit unit) {
this.timeout = timeout;
this.unit = unit;
}
@Override
void postSubmit(K key, Future future) {
TimeoutTask task = new TimeoutTask(key, future, this);
timeoutExecutor.schedule(task, timeout, unit);
}
private static class TimeoutTask implements Runnable {
private final K key;
private final Future future;
private final AbstractTimeoutScript script;
public TimeoutTask(K key, Future future, AbstractTimeoutScript script) {
this.key = key;
this.future = future;
this.script = script;
}
@Override
public void run() {
if (!future.isDone()) {
tryToCancel();
}
}
private void tryToCancel() {
try {
script.onTimeout(key);
script.cancel();
script.onError(key,
new TimeoutException("Script took longer than maximum allowed time for completion."));
} finally {
script.finish();
}
}
}
}