/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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
 *
 *      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 com.google.android.exoplayer.util;

/**
 * An interface through which system clocks can be read. The {@link SystemClock} implementation
 * must be used for all non-test cases.
 */
public interface Clock {

  /**
   * Returns {@link android.os.SystemClock#elapsedRealtime}.
   *
   * @return Elapsed milliseconds since boot.
   */
  long elapsedRealtime();

}