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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: Pump.java 362 2007-01-21 06:37:33Z cgruber $
*/
package net.israfil.foundation.concurrent;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* A worker that repeats and draws items from a producer and feeds it to a consumer
*
* @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber</a>
*/
public class CollectingPump<T> extends AbstractPump<T> {
protected Collection<ConcurrentProducer<T>> producers = null;
protected ConcurrentConsumer<T> consumer = null;
private List<ConcurrentProducer<T>> producersArray = null;
private int currentItem;
public CollectingPump() {}
public CollectingPump(String name, Collection<ConcurrentProducer<T>> producers, ConcurrentConsumer<T> consumer,
long timeout, TimeUnit timeoutUnit) {
super(name,timeout,timeoutUnit);
setProducers(producers);
setConsumer(consumer);
}
@Override
protected void validate() {
super.validate();
if (getConsumer() == null)
throw new IllegalStateException("consumer cannot be null.");
if (getProducers() == null || getProducers().size() == 0)
throw new IllegalStateException("producers cannot be null.");
}
@Override
public boolean continueProcessing() { return isRunning(); }
@Override
public long iterationDelay() { return 0; }
public Collection<ConcurrentProducer<T>> getProducers() { return producers; }
public void setProducers(Collection<ConcurrentProducer<T>> producers) {
if (this.isRunning())
throw new IllegalStateException("Cannot set producers while this pump is not stopped.");
this.producers = producers;
}
public ConcurrentConsumer<T> getConsumer() { return consumer; }
public void setConsumer(ConcurrentConsumer<T> consumer) {
if (!this.isStopped())
throw new IllegalStateException("Cannot set consumer while this pump is not stopped.");
this.consumer = consumer;
}
@Override
protected boolean init() throws InterruptedException {
boolean init = super.init() && this.getConsumer() != null &&
this.getProducers() != null && this.getProducers().size() > 0;
if (!init) return init; // fail fast.
producersArray = new ArrayList<ConcurrentProducer<T>>(producers); // get consistent list.
return init;
}
@Override
protected void process() throws InterruptedException {
ConcurrentProducer<T> producer = producersArray.get(currentItem++);
if (currentItem >= producersArray.size()) currentItem = 0;
consumer.consume(producer.produce());
}
}
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