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(final Class<? extends T> superclass) {
041        this.superclass = superclass;
042    }
043
044    @Override
045    public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) {
046        final Enhancer enhancer = new Enhancer();
047        enhancer.setSuperclass(superclass);
048
049        final CglibProxyHandler<T> proxyInterceptor =
050                new CglibProxyHandler<>(pooledObject, usageTracking);
051        enhancer.setCallback(proxyInterceptor);
052
053        @SuppressWarnings("unchecked")
054        final
055        T proxy = (T) enhancer.create();
056
057        return proxy;
058    }
059
060
061    @Override
062    public T resolveProxy(final T proxy) {
063        @SuppressWarnings("unchecked")
064        final
065        CglibProxyHandler<T> cglibProxyHandler =
066                (CglibProxyHandler<T>) ((Factory) proxy).getCallback(0);
067        final T pooledObject = cglibProxyHandler.disableProxy();
068        return pooledObject;
069    }
070
071    /**
072     * @since 2.4.3
073     */
074    @Override
075    public String toString() {
076        final StringBuilder builder = new StringBuilder();
077        builder.append("CglibProxySource [superclass=");
078        builder.append(superclass);
079        builder.append("]");
080        return builder.toString();
081    }
082}