com.netflix.servo.util.ClockWithOffset Maven / Gradle / Ivy
/**
* Copyright 2014 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.util;
/**
* A {@link Clock} that provides a way to modify the time returned by
* {@link System#currentTimeMillis()}.
*
* This can be used during application shutdown to force the clock forward and get the
* latest values which normally
* would not be returned until the next step boundary is crossed.
*/
public enum ClockWithOffset implements Clock {
/**
* Singleton.
*/
INSTANCE;
private volatile long offset = 0L;
/**
* Sets the offset for the clock.
*
* @param offset Number of milliseconds to add to the current time.
*/
public void setOffset(long offset) {
if (offset >= 0) {
this.offset = offset;
}
}
/**
* {@inheritDoc}
*/
@Override
public long now() {
return offset + System.currentTimeMillis();
}
}