content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.bookkeeper.common.testing.executors;
  
  import java.time.Clock;
  import java.time.Duration;
  import java.time.Instant;
  import java.time.ZoneId;
  
  /**
   * A mock implementation of {@link Clock}.
   */
  public class MockClock extends Clock {
  
      private final ZoneId zoneId;
      private Instant now = Instant.ofEpochMilli(0);
  
      public MockClock() {
          this(ZoneId.systemDefault());
      }
  
      private MockClock(ZoneId zoneId) {
          this.zoneId = zoneId;
      }
  
      @Override
      public ZoneId getZone() {
          return zoneId;
      }
  
      @Override
      public MockClock withZone(ZoneId zone) {
          return new MockClock(zone);
      }
  
      @Override
      public Instant instant() {
          return now;
      }
  
      /**
       * Advance the clock by the given amount of time.
       *
       * @param duration duration to advance.
       */
      public void advance(Duration duration) {
          now = now.plus(duration);
      }
  }
  