1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.pool2.proxy;
18
19 import org.apache.commons.pool2.UsageTracking;
20
21 import net.sf.cglib.proxy.Enhancer;
22 import net.sf.cglib.proxy.Factory;
23
24 /**
25 * cglib is unmaintained and does not work well (or possibly at all?) in newer JDKs, particularly JDK17+; see https://github.com/cglib/cglib
26 * <p>
27 * Provides proxy objects using CGLib.
28 * </p>
29 *
30 * @param <T> type of the pooled object to be proxied
31 * @since 2.0
32 */
33 public class CglibProxySource<T> implements ProxySource<T> {
34
35 private final Class<? extends T> superclass;
36
37 /**
38 * Constructs a new proxy source for the given class.
39 *
40 * @param superclass The class to proxy
41 */
42 public CglibProxySource(final Class<? extends T> superclass) {
43 this.superclass = superclass;
44 }
45
46 @SuppressWarnings("unchecked") // Case to T on return
47 @Override
48 public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) {
49 final Enhancer enhancer = new Enhancer();
50 enhancer.setSuperclass(superclass);
51
52 final CglibProxyHandler<T> proxyInterceptor =
53 new CglibProxyHandler<>(pooledObject, usageTracking);
54 enhancer.setCallback(proxyInterceptor);
55
56 return (T) enhancer.create();
57 }
58
59 @Override
60 public T resolveProxy(final T proxy) {
61 @SuppressWarnings("unchecked")
62 final
63 CglibProxyHandler<T> cglibProxyHandler =
64 (CglibProxyHandler<T>) ((Factory) proxy).getCallback(0);
65 return cglibProxyHandler.disableProxy();
66 }
67
68 /**
69 * @since 2.4.3
70 */
71 @Override
72 public String toString() {
73 final StringBuilder builder = new StringBuilder();
74 builder.append("CglibProxySource [superclass=");
75 builder.append(superclass);
76 builder.append("]");
77 return builder.toString();
78 }
79 }