/*************************GO-LICENSE-START*********************************
* Copyright 2014 ThoughtWorks, Inc.
*
* 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.
*************************GO-LICENSE-END***********************************/
package com.thoughtworks.go.util;
import org.apache.log4j.Logger;
public class PerfTimer {
private static final Logger LOG = Logger.getLogger(PerfTimer.class);
public static PerfTimer start(String message) {
return start(message, new SystemTimeClock());
}
static PerfTimer start(String message, Clock clock) {
PerfTimer timer = new PerfTimer(message, clock);
timer.start();
return timer;
}
private final String message;
private final Clock clock;
private long startTime;
private long elapsed;
private PerfTimer(String message, Clock clock) {
this.message = message;
this.clock = clock;
}
private void start() {
startTime = clock.currentTimeMillis();
}
public void stop() {
if (startTime==0) return;
elapsed = elapsed + (clock.currentTimeMillis() - startTime);
startTime = 0;
LOG.info(String.format("Performance: %s took %dms", message, elapsed()));
}
public long elapsed() {
if (startTime>0) stop();
return elapsed;
}
}