1 /* 2 * Copyright 2017, OpenCensus Authors 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 io.opencensus.common; 18 19 /** 20 * Interface for getting the current time. 21 * 22 * @since 0.5 23 */ 24 public abstract class Clock { 25 26 /** 27 * Obtains the current instant from this clock. 28 * 29 * @return the current instant. 30 * @since 0.5 31 */ now()32 public abstract Timestamp now(); 33 34 /** 35 * Returns a time measurement with nanosecond precision that can only be used to calculate elapsed 36 * time. 37 * 38 * @return a time measurement with nanosecond precision that can only be used to calculate elapsed 39 * time. 40 * @since 0.5 41 */ nowNanos()42 public abstract long nowNanos(); 43 } 44