org.apache.hudi.org.apache.hadoop.hbase.util.BoundedCompletionService Maven / Gradle / Ivy
/**
*
* 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.hadoop.hbase.util;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import org.apache.yetus.audience.InterfaceAudience;
/**
* A completion service, close to the one available in the JDK 1.7
* However, this ones keeps the list of the future, and allows to cancel them all.
* This means as well that it can be used for a small set of tasks only.
*
Implementation is not Thread safe.
*/
@InterfaceAudience.Private
public class BoundedCompletionService {
private final Executor executor;
private final List> tasks; // alls the tasks
private final BlockingQueue> completed; // all the tasks that are completed
class QueueingFuture extends FutureTask {
public QueueingFuture(Callable callable) {
super(callable);
}
@Override
protected void done() {
completed.add(QueueingFuture.this);
}
}
public BoundedCompletionService(Executor executor, int maxTasks) {
this.executor = executor;
this.tasks = new ArrayList<>(maxTasks);
this.completed = new ArrayBlockingQueue<>(maxTasks);
}
public Future submit(Callable task) {
QueueingFuture newFuture = new QueueingFuture(task);
executor.execute(newFuture);
tasks.add(newFuture);
return newFuture;
}
public Future take() throws InterruptedException{
return completed.take();
}
public Future poll(long timeout, TimeUnit unit) throws InterruptedException{
return completed.poll(timeout, unit);
}
public void cancelAll(boolean interrupt) {
for (Future future : tasks) {
future.cancel(interrupt);
}
}
}