001 /* 002 * Copyright (C) 2011 The Guava Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017 package com.google.common.base; 018 019 import com.google.common.annotations.Beta; 020 021 /** 022 * A time source; returns a time value representing the number of nanoseconds 023 * elapsed since some fixed but arbitrary point in time. 024 * 025 * @author Kevin Bourrillion 026 * @since 9 027 */ 028 @Beta 029 public interface Ticker { 030 /** 031 * Returns the number of nanoseconds elapsed since this ticker's fixed 032 * point of reference. 033 */ 034 long read(); 035 }