com.google.inject.internal.util.ContinuousStopwatch Maven / Gradle / Ivy
/*
* Copyright (C) 2020 Google 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.
*/
package com.google.inject.internal.util;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import com.google.common.base.Stopwatch;
import java.util.logging.Logger;
import javax.annotation.concurrent.NotThreadSafe;
/**
* A continuously timing stopwatch that is used for simple performance monitoring.
*
* @author [email protected] (Bob Lee)
*/
@NotThreadSafe
public final class ContinuousStopwatch {
private final Logger logger = Logger.getLogger(ContinuousStopwatch.class.getName());
private final Stopwatch stopwatch;
/**
* Constructs a ContinuousStopwatch, which will start timing immediately after construction.
*
* @param stopwatch the internal stopwatch used by ContinuousStopwatch
*/
public ContinuousStopwatch(Stopwatch stopwatch) {
this.stopwatch = stopwatch;
reset();
}
/** Resets and returns elapsed time in milliseconds. */
public long reset() {
long elapsedTimeMs = stopwatch.elapsed(MILLISECONDS);
stopwatch.reset();
stopwatch.start();
return elapsedTimeMs;
}
/** Resets and logs elapsed time in milliseconds. */
public void resetAndLog(String label) {
logger.fine(label + ": " + reset() + "ms");
}
}