1 /* 2 * Copyright (C) 2019 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 17 package com.google.android.setupcompat.internal; 18 19 /** 20 * A time source; returns a time value representing the number of nanoseconds elapsed since some 21 * fixed but arbitrary point in time. 22 * 23 * <p><b>Warning:</b> this interface can only be used to measure elapsed time, not wall time. 24 */ 25 public interface Ticker { 26 27 /** Returns the number of nanoseconds elapsed since this ticker's fixed point of reference. */ 28 long read(); 29 } 30
