1 /* 2 * Copyright (C) 2008 The Guava 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 com.google.common.testing; 18 19 import com.google.common.annotations.Beta; 20 import com.google.common.annotations.GwtCompatible; 21 import com.google.common.base.Ticker; 22 23 import java.util.concurrent.TimeUnit; 24 import java.util.concurrent.atomic.AtomicLong; 25 26 /** 27 * A Ticker whose value can be advanced programmatically in test. 28 * <p> 29 * This class is thread-safe. 30 * 31 * @author Jige Yu 32 * @since 10.0 33 */ 34 @Beta 35 @GwtCompatible 36 public class FakeTicker extends Ticker { 37 38 private final AtomicLong nanos = new AtomicLong(); 39 40 /** Advances the ticker value by {@code time} in {@code timeUnit}. */ advance(long time, TimeUnit timeUnit)41 public FakeTicker advance(long time, TimeUnit timeUnit) { 42 return advance(timeUnit.toNanos(time)); 43 } 44 45 /** Advances the ticker value by {@code nanoseconds}. */ advance(long nanoseconds)46 public FakeTicker advance(long nanoseconds) { 47 nanos.addAndGet(nanoseconds); 48 return this; 49 } 50 read()51 @Override public long read() { 52 return nanos.get(); 53 } 54 } 55