Logging Thread Pool : Log « Language Basics « Java

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Logging Thread Pool

        
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
package org.cspoker.common.util.threading;

import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.log4j.Logger;

public class LoggingThreadPool extends ScheduledThreadPoolExecutor {

  public LoggingThreadPool(int corePoolSize, String name) {
    super(corePoolSize, new LoggingThreadFactory(name));
    setMaximumPoolSize(2*corePoolSize);
  }

  private final ThreadLocal<Long> startTime = new ThreadLocal<Long>();
  private final AtomicLong numTasks = new AtomicLong();
  private final AtomicLong totalTime = new AtomicLong();
  private static Logger logger = Logger.getLogger(LoggingThreadPool.class);

  @Override
  protected void beforeExecute(Thread t, Runnable r) {
    super.beforeExecute(t, r);
    logger.trace(String.format("Thread %s: starting %s", t, r));
    startTime.set(System.nanoTime());
  }

  @Override
  protected void afterExecute(Runnable r, Throwable t) {
    try {
      long endTime = System.nanoTime();
      long taskTime = endTime - startTime.get();
      numTasks.incrementAndGet();
      totalTime.addAndGet(taskTime);
      logger.trace(String.format("Thread %s: done with %s, time=%dns", t,
          r, taskTime));
    } finally {
      super.afterExecute(r, t);
    }
  }

  @Override
  protected void terminated() {
    try {
      if (numTasks.get()>0) {
        logger.trace(String.format("Terminated: avg time=%dns",
            totalTime.get() / numTasks.get()));
      }
    } finally {
      super.terminated();
    }
  }
}

   
    
    
    
    
    
    
    
  

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