1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.tv.util; 17 18 import android.os.SystemClock; 19 20 /** 21 * An interface through which system clocks can be read. The {@link #SYSTEM} implementation 22 * must be used for all non-test cases. 23 */ 24 public interface Clock { 25 /** 26 * Returns the current time in milliseconds since January 1, 1970 00:00:00.0 UTC. 27 * See {@link System#currentTimeMillis()}. 28 */ currentTimeMillis()29 long currentTimeMillis(); 30 31 /** 32 * Returns milliseconds since boot, including time spent in sleep. 33 * 34 * @see SystemClock#elapsedRealtime() 35 */ elapsedRealtime()36 long elapsedRealtime(); 37 38 /** 39 * Waits a given number of milliseconds (of uptimeMillis) before returning. 40 * 41 * @param ms to sleep before returning, in milliseconds of uptime. 42 * @see SystemClock#sleep(long) 43 */ sleep(long ms)44 void sleep(long ms); 45 46 /** 47 * The default implementation of Clock. 48 */ 49 Clock SYSTEM = new Clock() { 50 @Override 51 public long currentTimeMillis() { 52 return System.currentTimeMillis(); 53 } 54 55 @Override 56 public long elapsedRealtime() { 57 return SystemClock.elapsedRealtime(); 58 } 59 60 @Override 61 public void sleep(long ms) { 62 SystemClock.sleep(ms); 63 } 64 }; 65 } 66