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/*
* Copyright 2017 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 android.app.servertransaction;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
/**
* An object pool that can provide reused objects if available.
* @hide
*/
class ObjectPool {
private static final Object sPoolSync = new Object();
private static final Map<Class, ArrayList<? extends ObjectPoolItem>> sPoolMap =
new HashMap<>();
private static final int MAX_POOL_SIZE = 50;
/**
* Obtain an instance of a specific class from the pool
* @param itemClass The class of the object we're looking for.
* @return An instance or null if there is none.
*/
public static <T extends ObjectPoolItem> T obtain(Class<T> itemClass) {
synchronized (sPoolSync) {
@SuppressWarnings("unchecked")
final ArrayList<T> itemPool = (ArrayList<T>) sPoolMap.get(itemClass);
if (itemPool != null && !itemPool.isEmpty()) {
return itemPool.remove(itemPool.size() - 1);
}
return null;
}
}
/**
* Recycle the object to the pool. The object should be properly cleared before this.
* @param item The object to recycle.
* @see ObjectPoolItem#recycle()
*/
public static <T extends ObjectPoolItem> void recycle(T item) {
synchronized (sPoolSync) {
@SuppressWarnings("unchecked")
ArrayList<T> itemPool = (ArrayList<T>) sPoolMap.get(item.getClass());
if (itemPool == null) {
itemPool = new ArrayList<>();
sPoolMap.put(item.getClass(), itemPool);
}
// Check if the item is already in the pool
final int size = itemPool.size();
for (int i = 0; i < size; i++) {
if (itemPool.get(i) == item) {
throw new IllegalStateException("Trying to recycle already recycled item");
}
}
if (size < MAX_POOL_SIZE) {
itemPool.add(item);
}
}
}
}
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