M7350/base/core/java/android/util/FinitePool.java
2024-09-09 08:52:07 +00:00

87 lines
2.1 KiB
Java

/*
* 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);
mManager.onAcquired(element);
}
return element;
}
public void release(T element) {
if (mInfinite || mPoolCount < mLimit) {
mPoolCount++;
element.setNextPoolable(mRoot);
mRoot = element;
}
mManager.onReleased(element);
}
}