/*
* 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.flink.runtime.io.disk.iomanager;
import java.io.Closeable;
import java.util.concurrent.LinkedBlockingQueue;
/**
* A {@link LinkedBlockingQueue} that is extended with closing methods.
*/
public final class RequestQueue<E> extends LinkedBlockingQueue<E> implements Closeable {
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() {
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;
}
}