001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.pool2.proxy;
018
019import net.sf.cglib.proxy.Enhancer;
020import net.sf.cglib.proxy.Factory;
021
022import org.apache.commons.pool2.UsageTracking;
023
024/**
025 * Provides proxy objects using CGLib.
026 *
027 * @param <T> type of the pooled object to be proxied
028 *
029 * @since 2.0
030 */
031public class CglibProxySource<T> implements ProxySource<T> {
032
033    private final Class<? extends T> superclass;
034
035    /**
036     * Create a new proxy source for the given class.
037     *
038     * @param superclass The class to proxy
039     */
040    public CglibProxySource(Class<? extends T> superclass) {
041        this.superclass = superclass;
042    }
043
044
045    @Override
046    public T createProxy(T pooledObject, UsageTracking<T> usageTracking) {
047        Enhancer enhancer = new Enhancer();
048        enhancer.setSuperclass(superclass);
049
050        CglibProxyHandler<T> proxyInterceptor =
051                new CglibProxyHandler<T>(pooledObject, usageTracking);
052        enhancer.setCallback(proxyInterceptor);
053
054        @SuppressWarnings("unchecked")
055        T proxy = (T) enhancer.create();
056
057        return proxy;
058    }
059
060
061    @Override
062    public T resolveProxy(T proxy) {
063        @SuppressWarnings("unchecked")
064        CglibProxyHandler<T> cglibProxyHandler =
065                (CglibProxyHandler<T>) ((Factory) proxy).getCallback(0);
066        T pooledObject = cglibProxyHandler.disableProxy();
067        return pooledObject;
068    }
069}