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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.impl.client;
29  
30  import java.io.IOException;
31  import java.lang.reflect.InvocationHandler;
32  import java.lang.reflect.InvocationTargetException;
33  import java.lang.reflect.Method;
34  import java.lang.reflect.Proxy;
35  
36  import org.apache.http.HttpEntity;
37  import org.apache.http.HttpResponse;
38  import org.apache.http.annotation.NotThreadSafe;
39  import org.apache.http.client.methods.CloseableHttpResponse;
40  import org.apache.http.util.EntityUtils;
41  
42  /**
43   * @since 4.3
44   */
45  @NotThreadSafe
46  class CloseableHttpResponseProxy implements InvocationHandler {
47  
48      private final HttpResponse original;
49  
50      CloseableHttpResponseProxy(final HttpResponse original) {
51          super();
52          this.original = original;
53      }
54  
55      public void close() throws IOException {
56          final HttpEntity entity = this.original.getEntity();
57          EntityUtils.consume(entity);
58      }
59  
60      @Override
61      public Object invoke(
62              final Object proxy, final Method method, final Object[] args) throws Throwable {
63          final String mname = method.getName();
64          if (mname.equals("close")) {
65              close();
66              return null;
67          } else {
68              try {
69                  return method.invoke(original, args);
70              } catch (final InvocationTargetException ex) {
71                  final Throwable cause = ex.getCause();
72                  if (cause != null) {
73                      throw cause;
74                  } else {
75                      throw ex;
76                  }
77              }
78          }
79      }
80  
81      public static CloseableHttpResponse newProxy(final HttpResponse original) {
82          return (CloseableHttpResponse) Proxy.newProxyInstance(
83                  CloseableHttpResponseProxy.class.getClassLoader(),
84                  new Class<?>[] { CloseableHttpResponse.class },
85                  new CloseableHttpResponseProxy(original));
86      }
87  
88  }