/*
* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.visualvm.core.scheduler;
import java.util.concurrent.TimeUnit;
/**
* This class {@linkplain TimeUnit} and provides easy conversion and comparation
* between various units
* @author Jaroslav Bachorik
*/
public class Quantum {
final public static Quantum SUSPENDED = new Quantum(TimeUnit.NANOSECONDS, -1);
/**
* Read-only field - the {@linkplain TimeUnit} used in the Quantum
*/
final public TimeUnit unit;
/**
* Read-only field - the interval
*/
final public int interval;
/**
* Sets-up a new quantum
* @param unit The {@linkplain TimeUnit} to use
* @param interval The interval
*/
public Quantum(TimeUnit unit, int interval) {
this.unit = unit;
this.interval = interval;
}
/**
* Factory method - creates a new quantum given the number of seconds
* @param interval The number of seconds
* @return Returns new instance of {@linkplain Quantum}
*/
public static Quantum seconds(int interval) {
return new Quantum(TimeUnit.SECONDS, interval);
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final Quantum other = (Quantum) obj;
if (this.getNanos() != other.getNanos()) {
return false;
}
return true;
}
@Override
public int hashCode() {
return (int)(getNanos() % 321721);
}
private long getNanos() {
long multiplier = 1;
switch(unit) {
case MICROSECONDS: {
multiplier = 1000;
break;
}
case MILLISECONDS: {
multiplier = 1000 * 1000;
break;
}
case SECONDS: {
multiplier = 1000 * 1000 * 1000;
break;
}
case MINUTES: {
multiplier = 60 * 1000 * 1000 * 1000;
break;
}
case HOURS: {
multiplier = 60 * 60 * 1000 * 1000 * 1000;
break;
}
case DAYS: {
multiplier = 24 * 60 * 1000 * 1000 * 1000;
break;
}
}
return interval * multiplier;
}
@Override
public String toString() {
return interval + unit.toString();
}
}