001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.jikesrvm.adaptive.measurements.organizers;
014    
015    import org.jikesrvm.adaptive.measurements.RuntimeMeasurements;
016    import org.jikesrvm.adaptive.measurements.listeners.YieldCounterListener;
017    import org.vmmagic.pragma.NonMoving;
018    
019    /**
020     * An organizer that periodically decays runtime counters
021     *
022     **/
023    @NonMoving
024    public final class DecayOrganizer extends Organizer {
025    
026      /**
027       * @param listener the associated listener
028       */
029      public DecayOrganizer(YieldCounterListener listener) {
030        this.listener = listener;
031        listener.setOrganizer(this);
032        makeDaemon(true);
033      }
034    
035      /**
036       * Initialization: install and activate our listener.
037       */
038      @Override
039      public void initialize() {
040        RuntimeMeasurements.installTimerNullListener((YieldCounterListener) listener);
041      }
042    
043      /**
044       * Method that is called when the sampling threshold is reached
045       * We decay the decayable objects and activate the listener again.
046       */
047      void thresholdReached() {
048        RuntimeMeasurements.decayDecayableObjects();
049      }
050    }
051    
052    
053