/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.nephele.services.iomanager;
import java.io.Closeable;
import java.io.IOException;
import java.util.concurrent.LinkedBlockingQueue;
/**
* A {@link LinkedBlockingQueue} that is extended with closing methods.
*
*/
public final class RequestQueue<E> extends LinkedBlockingQueue<E> implements Closeable
{
/**
* UID for serialization interoperability.
*/
private static final long serialVersionUID = 3804115535778471680L;
/**
* Flag marking this queue as closed.
*/
private volatile boolean closed = false;
/**
* Closes this request queue.
*
* @see java.io.Closeable#close()
*/
@Override
public void close() throws IOException {
this.closed = true;
}
/**
* Checks whether this request queue is closed.
*
* @return True, if the queue is closed, false otherwise.
*/
public boolean isClosed()
{
return this.closed;
}
}