com.netflix.servo.monitor.BasicStopwatch Maven / Gradle / Ivy
/**
* Copyright 2013 Netflix, 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.netflix.servo.monitor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
/**
* This class does not enforce starting or stopping once and only once without a reset.
*/
public class BasicStopwatch implements Stopwatch {
private final AtomicLong startTime = new AtomicLong(0L);
private final AtomicLong endTime = new AtomicLong(0L);
private final AtomicBoolean running = new AtomicBoolean(false);
/**
* {@inheritDoc}
*/
@Override
public void start() {
startTime.set(System.nanoTime());
running.set(true);
}
/**
* {@inheritDoc}
*/
@Override
public void stop() {
endTime.set(System.nanoTime());
running.set(false);
}
/**
* {@inheritDoc}
*/
@Override
public void reset() {
startTime.set(0L);
endTime.set(0L);
running.set(false);
}
/**
* {@inheritDoc}
*/
@Override
public long getDuration(TimeUnit timeUnit) {
return timeUnit.convert(getDuration(), TimeUnit.NANOSECONDS);
}
/**
* Returns the duration in nanoseconds. No checks are performed to ensure that the stopwatch
* has been properly started and stopped before executing this method. If called before stop
* it will return the current duration.
*/
@Override
public long getDuration() {
final long end = running.get() ? System.nanoTime() : endTime.get();
return end - startTime.get();
}
}