From 7c279747beb43c7e88633a6228a155a30e6834f7 Mon Sep 17 00:00:00 2001
From: Benjamin Culkin <scorpress@gmail.com>
Date: Mon, 27 May 2024 11:38:33 -0400
Subject: Initial import

---
 .../foundation/concurrent/CollectingPump.java      | 109 +++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 israfil-foundation-concurrent/src/main/java/net/israfil/foundation/concurrent/CollectingPump.java

(limited to 'israfil-foundation-concurrent/src/main/java/net/israfil/foundation/concurrent/CollectingPump.java')

diff --git a/israfil-foundation-concurrent/src/main/java/net/israfil/foundation/concurrent/CollectingPump.java b/israfil-foundation-concurrent/src/main/java/net/israfil/foundation/concurrent/CollectingPump.java
new file mode 100644
index 0000000..3ed37af
--- /dev/null
+++ b/israfil-foundation-concurrent/src/main/java/net/israfil/foundation/concurrent/CollectingPump.java
@@ -0,0 +1,109 @@
+/*
+ * 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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