| /* |
| * Copyright (C) 2009 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.util; |
| |
| /** |
| * @hide |
| */ |
| class FinitePool<T extends Poolable<T>> implements Pool<T> { |
| /** |
| * Factory used to create new pool objects |
| */ |
| private final PoolableManager<T> mManager; |
| /** |
| * Maximum number of objects in the pool |
| */ |
| private final int mLimit; |
| /** |
| * If true, mLimit is ignored |
| */ |
| private final boolean mInfinite; |
| |
| /** |
| * Next object to acquire |
| */ |
| private T mRoot; |
| /** |
| * Number of objects in the pool |
| */ |
| private int mPoolCount; |
| |
| FinitePool(PoolableManager<T> manager) { |
| mManager = manager; |
| mLimit = 0; |
| mInfinite = true; |
| } |
| |
| FinitePool(PoolableManager<T> manager, int limit) { |
| if (limit <= 0) throw new IllegalArgumentException("The pool limit must be > 0"); |
| |
| mManager = manager; |
| mLimit = limit; |
| mInfinite = false; |
| } |
| |
| public T acquire() { |
| T element; |
| |
| if (mRoot != null) { |
| element = mRoot; |
| mRoot = element.getNextPoolable(); |
| mPoolCount--; |
| } else { |
| element = mManager.newInstance(); |
| } |
| |
| if (element != null) { |
| element.setNextPoolable(null); |
| element.setPooled(false); |
| mManager.onAcquired(element); |
| } |
| |
| return element; |
| } |
| |
| public void release(T element) { |
| if (element.isPooled()) { |
| throw new IllegalArgumentException("Element already in the pool."); |
| } |
| if (mInfinite || mPoolCount < mLimit) { |
| mPoolCount++; |
| element.setNextPoolable(mRoot); |
| element.setPooled(true); |
| mRoot = element; |
| } |
| mManager.onReleased(element); |
| } |
| } |