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/*
* 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.android.systemui.shared.recents.model;
import android.util.LruCache;
import com.android.systemui.shared.recents.model.Task.TaskKey;
import java.io.PrintWriter;
/**
* A mapping of {@link TaskKey} to value, with additional LRU functionality where the least
* recently referenced key/values will be evicted as more values than the given cache size are
* inserted.
*
* In addition, this also allows the caller to invalidate cached values for keys that have since
* changed.
*/
public class TaskKeyLruCache<V> extends TaskKeyCache<V> {
public interface EvictionCallback {
void onEntryEvicted(TaskKey key);
}
private final LruCache<Integer, V> mCache;
private final EvictionCallback mEvictionCallback;
public TaskKeyLruCache(int cacheSize) {
this(cacheSize, null);
}
public TaskKeyLruCache(int cacheSize, EvictionCallback evictionCallback) {
mEvictionCallback = evictionCallback;
mCache = new LruCache<Integer, V>(cacheSize) {
@Override
protected void entryRemoved(boolean evicted, Integer taskId, V oldV, V newV) {
if (mEvictionCallback != null) {
mEvictionCallback.onEntryEvicted(mKeys.get(taskId));
}
mKeys.remove(taskId);
}
};
}
/** Trims the cache to a specific size */
final void trimToSize(int cacheSize) {
mCache.trimToSize(cacheSize);
}
public void dump(String prefix, PrintWriter writer) {
String innerPrefix = prefix + " ";
writer.print(prefix); writer.print(TAG);
writer.print(" numEntries="); writer.print(mKeys.size());
writer.println();
int keyCount = mKeys.size();
for (int i = 0; i < keyCount; i++) {
writer.print(innerPrefix); writer.println(mKeys.get(mKeys.keyAt(i)));
}
}
@Override
protected V getCacheEntry(int id) {
return mCache.get(id);
}
@Override
protected void putCacheEntry(int id, V value) {
mCache.put(id, value);
}
@Override
protected void removeCacheEntry(int id) {
mCache.remove(id);
}
@Override
protected void evictAllCache() {
mCache.evictAll();
}
}
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