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/*
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*
* Copyright (c) [2018] Payara Foundation and/or its affiliates. All rights reserved.
*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
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* Copyright 2010-2013 Coda Hale and Yammer, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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*
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package fish.payara.microprofile.metrics.impl;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
/**
* An abstraction for how time passes. It is passed to {@link Timer} to track
* timing.
*/
public abstract class Clock {
/**
* Returns the current time tick.
*
* @return time tick in nanoseconds
*/
public abstract long getTick();
/**
* Returns the current time in milliseconds.
*
* @return time in milliseconds
*/
public long getTime() {
return System.currentTimeMillis();
}
private static final Clock DEFAULT = new UserTimeClock();
/**
* The default clock to use.
*
* @return the default {@link Clock} instance
*
* @see Clock.UserTimeClock
*/
public static Clock defaultClock() {
return DEFAULT;
}
/**
* A clock implementation which returns the current time in epoch
* nanoseconds.
*/
public static class UserTimeClock extends Clock {
@Override
public long getTick() {
return System.nanoTime();
}
}
/**
* A clock implementation which returns the current thread's CPU time.
*/
public static class CpuTimeClock extends Clock {
private static final ThreadMXBean THREAD_MX_BEAN = ManagementFactory.getThreadMXBean();
@Override
public long getTick() {
return THREAD_MX_BEAN.getCurrentThreadCpuTime();
}
}
}