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 */ 013package org.jikesrvm.adaptive.measurements.listeners; 014 015import org.vmmagic.pragma.Uninterruptible; 016 017/** 018 * A NullListener is an object that is invoked when 019 * online measurement information must be collected. 020 * <p> 021 * Defines update's interface. 022 */ 023@Uninterruptible 024public abstract class NullListener extends Listener { 025 /** 026 * This method is called when its time to record that a 027 * yield point has occurred. 028 * @param whereFrom Was this a yieldpoint in a PROLOGUE, BACKEDGE, or 029 * EPILOGUE? 030 */ 031 public abstract void update(int whereFrom); 032}