nblair.pipeline.PipelineThreadPoolExecutor.java Source code

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Here is the source code for nblair.pipeline.PipelineThreadPoolExecutor.java

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/**
 *    Copyright 2012, Board of Regents of the University of Wisconsin System
 *
 *    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 nblair.pipeline;

import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.scheduling.concurrent.CustomizableThreadFactory;

/**
 * Sub class of {@link ThreadPoolExecutor} tailored for {@link AbstractMigrationStep}.
 *  
 * @author Nicholas Blair
 */
public class PipelineThreadPoolExecutor extends ThreadPoolExecutor {

    protected final Log log = LogFactory.getLog(this.getClass());

    /**
     * Calls the superclass' constructor passing in the queueCapacity,
     * 1 Minute keep alive time, a bounded {@link LinkedBlockingQueue},
     * a {@link CustomizableThreadFactory}, and an {@link OfferRejectedExecutionHandler}.
     * 
     * @see LinkedBlockingQueue
     * @see ThreadPoolExecutor
     * @see CustomizableThreadFactory
     * @param queueCapacity the capacity of the work queue
     * @param namePrefix the thread name prefix
     */
    public PipelineThreadPoolExecutor(int queueCapacity, String namePrefix) {
        super(queueCapacity, queueCapacity, 1, TimeUnit.MINUTES, new LinkedBlockingQueue<Runnable>(queueCapacity),
                new CustomizableThreadFactory(namePrefix), new OfferRejectedExecutionHandler());
    }

    /* (non-Javadoc)
     * @see java.util.concurrent.ThreadPoolExecutor#afterExecute(java.lang.Runnable, java.lang.Throwable)
     */
    @Override
    protected void afterExecute(Runnable r, Throwable t) {
        if (t != null) {
            log.fatal("pipeline step failed", t);
        }
        super.afterExecute(r, t);
    }
}