/*
* Java port of Bullet (c) 2008 Martin Dvorak <jezek2@advel.cz>
*
* Bullet Continuous Collision Detection and Physics Library
* Copyright (c) 2003-2008 Erwin Coumans http://www.bulletphysics.com/
*
* This software is provided 'as-is', without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
package com.bulletphysics.util;
import java.util.HashMap;
import java.util.Map;
/**
* Object pool.
*
* @author jezek2
*/
public class ObjectPool<T> {
private Class<T> cls;
private Supplier<T> supplier;
private ObjectArrayList<T> list = new ObjectArrayList<T>();
public ObjectPool(Class<T> cls, Supplier<T> supplier) {
this.cls = cls;
this.supplier = supplier;
}
/**
* Returns instance from pool, or create one if pool is empty.
*
* @return instance
*/
public T get() {
if (list.size() > 0) {
return list.remove(list.size() - 1);
}
else {
return supplier.get();
}
}
/**
* Release instance into pool.
*
* @param obj previously obtained instance from pool
*/
public void release(T obj) {
list.add(obj);
}
////////////////////////////////////////////////////////////////////////////
private static ThreadLocal<Map> threadLocal = new ThreadLocal<Map>() {
@Override
protected Map initialValue() {
return new HashMap();
}
};
/**
* Returns per-thread object pool for given type, or create one if it doesn't exist.
*
* @param cls type
* @return object pool
*/
@SuppressWarnings("unchecked")
public static <T> ObjectPool<T> get(Class<T> cls, Supplier<T> supplier) {
Map map = threadLocal.get();
ObjectPool<T> pool = (ObjectPool<T>)map.get(cls);
if (pool == null) {
pool = new ObjectPool<T>(cls, supplier);
map.put(cls, pool);
}
return pool;
}
public static void cleanCurrentThread() {
threadLocal.remove();
}
}