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.execchain;
29
30 import java.io.Closeable;
31 import java.io.IOException;
32 import java.lang.reflect.InvocationHandler;
33 import java.lang.reflect.InvocationTargetException;
34 import java.lang.reflect.Method;
35
36 import org.apache.http.HttpEntity;
37 import org.apache.http.HttpResponse;
38 import org.apache.http.annotation.NotThreadSafe;
39
40 /**
41 * A proxy class for {@link HttpResponse} that can be used to release client connection
42 * associated with the original response.
43 *
44 * @since 4.3
45 */
46 @NotThreadSafe
47 class ResponseProxyHandler implements InvocationHandler {
48
49 private static final Method CLOSE_METHOD;
50
51 static {
52 try {
53 CLOSE_METHOD = Closeable.class.getMethod("close");
54 } catch (final NoSuchMethodException ex) {
55 throw new Error(ex);
56 }
57 }
58
59 private final HttpResponse original;
60 private final ConnectionHolder connHolder;
61
62 ResponseProxyHandler(
63 final HttpResponse original,
64 final ConnectionHolder connHolder) {
65 super();
66 this.original = original;
67 this.connHolder = connHolder;
68 final HttpEntity entity = original.getEntity();
69 if (entity != null && entity.isStreaming() && connHolder != null) {
70 this.original.setEntity(new ResponseEntityWrapper(entity, connHolder));
71 }
72 }
73
74 public void close() throws IOException {
75 if (this.connHolder != null) {
76 this.connHolder.abortConnection();
77 }
78 }
79
80 public Object invoke(
81 final Object proxy, final Method method, final Object[] args) throws Throwable {
82 if (method.equals(CLOSE_METHOD)) {
83 close();
84 return null;
85 } else {
86 try {
87 return method.invoke(original, args);
88 } catch (final InvocationTargetException ex) {
89 final Throwable cause = ex.getCause();
90 if (cause != null) {
91 throw cause;
92 } else {
93 throw ex;
94 }
95 }
96 }
97 }
98
99 }