/*
 * Copyright (C) 2018 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.exoplayer2.upstream.cache;

import com.google.android.exoplayer2.upstream.DataSpec;

/** Factory for cache keys. */
public interface CacheKeyFactory {

  /**
   * Returns a cache key for the given {@link DataSpec}.
   *
   * @param dataSpec The data being cached.
   */
  String buildCacheKey(DataSpec dataSpec);

  /**
   * Returns the number of parallel tasks used to download segments.
   *
   * @return must be at least 1.
   */
  int maxDownloadParallelSegments();
}
