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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 DistributingPump<T> extends AbstractPump<T> {
+
+ protected ConcurrentProducer<T> producer;
+ protected Collection<ConcurrentConsumer<T>> consumers;
+ private List<ConcurrentConsumer<T>> consumersArray = null;
+ private int currentItem;
+
+ public DistributingPump() {}
+
+ public DistributingPump(String name, ConcurrentProducer<T> producer, Collection<ConcurrentConsumer<T>> consumers,
+ long timeout, TimeUnit timeoutUnit) {
+ super(name,timeout,timeoutUnit);
+ setProducer(producer);
+ setConsumers(consumers);
+ }
+
+ @Override
+ protected void validate() {
+ super.validate();
+ if (getProducer() == null)
+ throw new IllegalStateException("consumer cannot be null.");
+ if (getConsumers() == null || getConsumers().size() == 0)
+ throw new IllegalStateException("producers cannot be null.");
+ }
+
+ @Override
+ public boolean continueProcessing() { return isRunning(); }
+
+ @Override
+ public long iterationDelay() { return 0; }
+
+ public ConcurrentProducer<T> getProducer() { return producer; }
+
+ public void setProducer(ConcurrentProducer<T> producer) { this.producer = producer; }
+
+ public Collection<ConcurrentConsumer<T>> getConsumers() { return consumers; }
+
+ public void setConsumers(Collection<ConcurrentConsumer<T>> consumers) { this.consumers = consumers; }
+
+ @Override
+ protected boolean init() throws InterruptedException {
+ boolean init = super.init() && this.getProducer() != null &&
+ this.getConsumers() != null && this.getConsumers().size() > 0;
+ if (!init) return init; // fail fast.
+ consumersArray = new ArrayList<ConcurrentConsumer<T>>(consumers); // get consistent list.
+ return init;
+ }
+
+ @Override
+ protected void process() throws InterruptedException {
+ ConcurrentConsumer<T> consumer = consumersArray.get(currentItem++);
+ if (currentItem >= consumersArray.size()) currentItem = 0;
+ consumer.consume(producer.produce());
+ }
+
+}