1 /* 2 * Copyright 2022 Google LLC 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.google.android.libraries.mobiledatadownload; 17 18 /** Interface through which the SystemClock can be read. */ 19 public interface TimeSource { 20 /** Returns the current system time in milliseconds since January 1, 1970 00:00:00 UTC. */ currentTimeMillis()21 long currentTimeMillis(); 22 23 /** Returns nanoseconds since boot, including time spent in sleep. */ elapsedRealtimeNanos()24 long elapsedRealtimeNanos(); 25 } 26