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  * Copyright (C) 2008 The Guava Authors
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
import static;
A Ticker whose value can be advanced programmatically in test.

The ticker can be configured so that the time is incremented whenever read() is called: see setAutoIncrementStep(long,java.util.concurrent.TimeUnit).

This class is thread-safe.

Jige Yu
public class FakeTicker extends Ticker {
  private final AtomicLong nanos = new AtomicLong();
  private volatile long autoIncrementStepNanos;

Advances the ticker value by time in timeUnit.
  public FakeTicker advance(long timeTimeUnit timeUnit) {
    return advance(timeUnit.toNanos(time));

Advances the ticker value by nanoseconds.
  public FakeTicker advance(long nanoseconds) {
    return this;

Sets the increment applied to the ticker whenever it is queried.

The default behavior is to auto increment by zero. i.e: The ticker is left unchanged when queried.

  public FakeTicker setAutoIncrementStep(long autoIncrementStepTimeUnit timeUnit) {
    checkArgument(autoIncrementStep >= 0, "May not auto-increment by a negative amount");
    this. = timeUnit.toNanos(autoIncrementStep);
    return this;
  @Override public long read() {
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