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/*
* Copyright (C) 2016 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 org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.cache;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
/**
* Evicts data from a {@link Cache}. Implementations should call {@link Cache#removeSpan(CacheSpan)}
* to evict cache entries based on their eviction policies.
*/
public interface CacheEvictor extends Cache.Listener {
/**
* Returns whether the evictor requires the {@link Cache} to touch {@link CacheSpan CacheSpans}
* when it accesses them. Implementations that do not use {@link CacheSpan#lastTouchTimestamp}
* should return {@code false}.
*/
boolean requiresCacheSpanTouches();
/**
* Called when cache has been initialized.
*/
void onCacheInitialized();
/**
* Called when a writer starts writing to the cache.
*
* @param cache The source of the event.
* @param key The key being written.
* @param position The starting position of the data being written.
* @param length The length of the data being written, or {@link C#LENGTH_UNSET} if unknown.
*/
void onStartFile(Cache cache, String key, long position, long length);
}
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