| /* |
| * 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.recents.model; |
| |
| import android.util.LruCache; |
| |
| import java.io.PrintWriter; |
| |
| /** |
| * A mapping of {@link Task.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 { |
| public void onEntryEvicted(Task.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(); |
| } |
| } |