View Javadoc
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   * Provides proxy objects using CGLib.
26   *
27   * @param <T> type of the pooled object to be proxied
28   *
29   * @since 2.0
30   */
31  public class CglibProxySource<T> implements ProxySource<T> {
32  
33      private final Class<? extends T> superclass;
34  
35      /**
36       * Constructs a new proxy source for the given class.
37       *
38       * @param superclass The class to proxy
39       */
40      public CglibProxySource(final Class<? extends T> superclass) {
41          this.superclass = superclass;
42      }
43  
44      @SuppressWarnings("unchecked") // Case to T on return
45      @Override
46      public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) {
47          final Enhancer enhancer = new Enhancer();
48          enhancer.setSuperclass(superclass);
49  
50          final CglibProxyHandler<T> proxyInterceptor =
51                  new CglibProxyHandler<>(pooledObject, usageTracking);
52          enhancer.setCallback(proxyInterceptor);
53  
54          return (T) enhancer.create();
55      }
56  
57  
58      @Override
59      public T resolveProxy(final T proxy) {
60          @SuppressWarnings("unchecked")
61          final
62          CglibProxyHandler<T> cglibProxyHandler =
63                  (CglibProxyHandler<T>) ((Factory) proxy).getCallback(0);
64          return cglibProxyHandler.disableProxy();
65      }
66  
67      /**
68       * @since 2.4.3
69       */
70      @Override
71      public String toString() {
72          final StringBuilder builder = new StringBuilder();
73          builder.append("CglibProxySource [superclass=");
74          builder.append(superclass);
75          builder.append("]");
76          return builder.toString();
77      }
78  }