/* Map/Reduce Algorithm Copyright (c) 2006-2014 The Regents of the University of California. All rights reserved. Permission is hereby granted, without written agreement and without license or royalty fees, to use, copy, modify, and distribute this software and its documentation for any purpose, provided that the above copyright notice and the following two paragraphs appear in all copies of this software. IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. PT_COPYRIGHT_VERSION_2 COPYRIGHTENDKEY */ package ptolemy.actor.ptalon.lib; import java.util.List; import java.util.concurrent.BlockingQueue; import ptolemy.kernel.util.IllegalActionException; /** The MapReduce Algorithm.
See MapReduce: Simplified Data Processing on Large Clusters
@author Adam Cataldo
@version $Id: MapReduceAlgorithm.java 70398 2014-10-22 23:44:32Z cxh $
@since Ptolemy II 6.1
@Pt.ProposedRating Red (cxh)
@Pt.AcceptedRating Red (cxh)
*/
public abstract class MapReduceAlgorithm extends Thread {
/** Return true if the reduce is finished.
* @return Return true if the reduce is finished.
* @exception IllegalActionException If there was a thread error.
*/
public synchronized boolean isReduceFinished()
throws IllegalActionException {
if (_threadError) {
throw new IllegalActionException("Error writing to key "
+ reduceKey);
}
return _threadDone;
}
/**
* Subclasses should implement their map method here.
* @param key The key passed to the map method.
* @param value The value passed to the map method.
* @return The list of key value pairs for the given input.
*/
public abstract List