/*
* Copyright (C) 2011 The Guava Authors
*
* 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.linecorp.armeria.common.util;
/**
* A time source; returns a time value representing the number of nanoseconds elapsed since some
* fixed but arbitrary point in time.
*
* <p><b>Warning:</b> this interface can only be used to measure elapsed time, not wall time.
*
* @author Kevin Bourrillion
*/
@FunctionalInterface
public interface Ticker {
/**
* Returns the number of nanoseconds elapsed since this ticker's fixed point of reference.
*/
long read();
/**
* A ticker that reads the current time using {@link System#nanoTime}.
*/
static Ticker systemTicker() {
return System::nanoTime;
}
}