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YieldRandomly.java
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/
YieldRandomly.java
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/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.harness.scheduler;
import java.util.Random;
public final class YieldRandomly extends AbstractPolicy implements Policy {
private int index = 0;
private int counter;
private static Random rng = null;
private final int[] schedule;
private void resetCounter() {
counter = schedule[index++];
index = index % schedule.length;
}
public YieldRandomly(Thread thread, int seed, int length, int min, int max) {
super(thread);
this.schedule = new int[length];
if (rng == null) {
rng = new Random(seed);
}
for (int i=0; i < length; i++) {
schedule[i] = rng.nextInt(max-min+1)+min;
}
}
@Override
public boolean taken() {
if (counter == 0) {
resetCounter();
}
return --counter == 0;
}
@Override
protected String formatPolicy() {
StringBuilder result = new StringBuilder();
for (int i=0; i < schedule.length; i++) {
result.append(schedule[i]);
if (i < schedule.length-1) {
result.append(",");
}
}
return result.toString();
}
}