ForceQueuePolicy.java

/*
 * Copyright 2004-2009 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.compass.core.util.concurrent;

import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * A handler for rejected tasks that adds the specified element to this queue,
 * waiting if necessary for space to become available.
 *
 * @author kimchy
 */
public class ForceQueuePolicy implements RejectedExecutionHandler {
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
        try {
            executor.getQueue().put(r);
        } catch (InterruptedException e) {
            //should never happen since we never wait
            throw new RejectedExecutionException(e);
        }
    }
}