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/*
* Copyright (c) 2003 - 2007 Israfil Consulting Services Corporation
* Copyright (c) 2003 - 2007 Christian Edward Gruber
* All Rights Reserved
*
* This software is licensed under the Berkeley Standard Distribution license,
* (BSD license), as defined below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of Israfil Consulting Services nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* $Id: RepeatingWorker.java 367 2007-01-22 23:02:28Z cgruber $
*/
package net.israfil.foundation.concurrent;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A Worker sub-class that implements a slightly different lifecycle. In
* particular, it iterates based on a continuProcessing() signalling method.
* It also implements pre and post processing logic in case any per-iteration
* setup and tear-down is required.
*
*
* @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
*/
public abstract class RepeatingWorker extends AbstractWorker {
private static Logger logger = Logger.getLogger(RepeatingWorker.class.getName());
public RepeatingWorker() { }
public RepeatingWorker(String name) { super(name); }
public void executeLifecycle() throws InterruptedException {
do {
logger.finer(getName() + " about to pre-process.");
preProcess();
logger.finer(getName() + " completed pre-processing.");
logger.finer(getName() + " about to process.");
process();
logger.finer(getName() + " completed processing.");
logger.finer(getName() + " about to post-process.");
postProcess();
logger.finer(getName() + " completed post-processing.");
Thread.yield();
} while (continueProcessing() && delay());
}
public abstract boolean continueProcessing() throws InterruptedException;
/**
* @return long Number of milliseconds to delay between iterations
*/
public abstract long iterationDelay();
/**
* Returns boolean only so it can be used in a while statement. delay()
* simply sleeps as long as iterationDelay() indicates, then returns true,
* unless interrupted in which case it returns false.
*/
private boolean delay() {
try {
Thread.sleep(iterationDelay());
return true;
} catch (InterruptedException e) {
logger.log(Level.WARNING, getName() + " interrupted.",e);
return false;
}
}
public void preProcess() { }
public void postProcess() { }
}
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