org.apache.activemq.util.StopWatch Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.activemq.util;
/**
* A very simple stop watch.
*
* This implementation is not thread safe and can only time one task at any given time.
*/
public final class StopWatch {
private long start;
private long stop;
/**
* Starts the stop watch
*/
public StopWatch() {
this(true);
}
/**
* Creates the stop watch
*
* @param started whether it should start immediately
*/
public StopWatch(boolean started) {
if (started) {
restart();
}
}
/**
* Starts or restarts the stop watch
*/
public void restart() {
start = System.currentTimeMillis();
stop = 0;
}
/**
* Stops the stop watch
*
* @return the time taken in milliseconds.
*/
public long stop() {
stop = System.currentTimeMillis();
return taken();
}
/**
* Returns the time taken in milliseconds.
*
* @return time in milliseconds
*/
public long taken() {
if (start > 0 && stop > 0) {
return stop - start;
} else if (start > 0) {
return System.currentTimeMillis() - start;
} else {
return 0;
}
}
}