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.beam.sdk.util;
  
  /**
   * Sleeper interface to use for requesting the current thread to sleep as specified in {@link
   * Thread#sleep(long)}.
   *
   * <p>The default implementation can be accessed at {@link #DEFAULT}. Primarily used for testing.
   *
   * <p><b>Note</b>: This interface is copied from Google API client library to avoid its dependency.
   */
  public interface Sleeper {
  
    /**
     * Causes the currently executing thread to sleep (temporarily cease execution) for the specified
     * number of milliseconds as specified in {@link Thread#sleep(long)}.
     *
     * @param millis length of time to sleep in milliseconds
     * @throws InterruptedException if any thread has interrupted the current thread
     */
    void sleep(long millis) throws InterruptedException;
  
    /** Provides the default implementation based on {@link Thread#sleep(long)}. */
    Sleeper DEFAULT = Thread::sleep;
  }
  