    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 org.apache.commons.pool2.UsageTracking;
    020
    021import net.sf.cglib.proxy.Enhancer;
    022import net.sf.cglib.proxy.Factory;
    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     * Constructs 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    @SuppressWarnings("unchecked") // Case to T on return
    045    @Override
    046    public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) {
    047        final Enhancer enhancer = new Enhancer();
    048        enhancer.setSuperclass(superclass);
    049
    050        final CglibProxyHandler<T> proxyInterceptor =
    051                new CglibProxyHandler<>(pooledObject, usageTracking);
    052        enhancer.setCallback(proxyInterceptor);
    053
    054        return (T) enhancer.create();
    055    }
    056
    057
    058    @Override
    059    public T resolveProxy(final T proxy) {
    060        @SuppressWarnings("unchecked")
    061        final
    062        CglibProxyHandler<T> cglibProxyHandler =
    063                (CglibProxyHandler<T>) ((Factory) proxy).getCallback(0);
    064        return cglibProxyHandler.disableProxy();
    065    }
    066
    067    /**
    068     * @since 2.4.3
    069     */
    070    @Override
    071    public String toString() {
    072        final StringBuilder builder = new StringBuilder();
    073        builder.append("CglibProxySource [superclass=");
    074        builder.append(superclass);
    075        builder.append("]");
    076        return builder.toString();
    077    }
    078}