com.gemstone.gemfire.internal.util.StopWatch Maven / Gradle / Ivy
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.internal.util;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
/** Stop watch for measuring elapsed time. Not thread-safe. */
public class StopWatch {
private long startTime;
private long stopTime;
/** Constructs a StopWatch which has not yet been started */
public StopWatch() {
this(false);
}
/** @param start true if new StopWatch should automatically start */
public StopWatch(boolean start) {
if (start) {
start();
}
}
/**
* Returns the elapsed time in millis since starting. Value is final once
* stopped.
*/
public long elapsedTimeMillis() {
if (this.stopTime == 0) {
return System.currentTimeMillis() - this.startTime;
}
else {
return this.stopTime - this.startTime;
}
}
/** Start the stop watch */
public void start() {
this.startTime = System.currentTimeMillis();
this.stopTime = 0;
}
/** Stop the stop watch */
public void stop() {
if (!isRunning()) {
throw new IllegalStateException(LocalizedStrings.StopWatch_ATTEMPTED_TO_STOP_NONRUNNING_STOPWATCH.toLocalizedString());
}
this.stopTime = System.currentTimeMillis();
}
/** Returns true if stop watch is currently running */
public boolean isRunning() {
return this.startTime > 0 && this.stopTime == 0;
}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer("[StopWatch: ");
sb.append("startTime=").append(this.startTime);
sb.append(", stopTime=").append(this.stopTime);
sb.append(", isRunning=").append(isRunning());
sb.append("]");
return sb.toString();
}
}