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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.nio.reactor;
29  
30  import java.io.IOException;
31  import java.net.SocketAddress;
32  import java.nio.channels.Channel;
33  import java.nio.channels.SelectionKey;
34  
35  import org.apache.http.annotation.ThreadSafe;
36  import org.apache.http.nio.reactor.IOSession;
37  import org.apache.http.nio.reactor.SessionRequest;
38  import org.apache.http.nio.reactor.SessionRequestCallback;
39  
40  /**
41   * Default implementation of {@link SessionRequest}.
42   *
43   * @since 4.0
44   */
45  @ThreadSafe
46  public class SessionRequestImpl implements SessionRequest {
47  
48      private volatile boolean completed;
49      private volatile SelectionKey key;
50  
51      private final SocketAddress remoteAddress;
52      private final SocketAddress localAddress;
53      private final Object attachment;
54      private final SessionRequestCallback callback;
55  
56      private volatile int connectTimeout;
57      private volatile IOSession session = null;
58      private volatile IOException exception = null;
59  
60      public SessionRequestImpl(
61              final SocketAddress remoteAddress,
62              final SocketAddress localAddress,
63              final Object attachment,
64              final SessionRequestCallback callback) {
65          super();
66          if (remoteAddress == null) {
67              throw new IllegalArgumentException("Remote address may not be null");
68          }
69          this.remoteAddress = remoteAddress;
70          this.localAddress = localAddress;
71          this.attachment = attachment;
72          this.callback = callback;
73          this.connectTimeout = 0;
74      }
75  
76      public SocketAddress getRemoteAddress() {
77          return this.remoteAddress;
78      }
79  
80      public SocketAddress getLocalAddress() {
81          return this.localAddress;
82      }
83  
84      public Object getAttachment() {
85          return this.attachment;
86      }
87  
88      public boolean isCompleted() {
89          return this.completed;
90      }
91  
92      protected void setKey(final SelectionKey key) {
93          this.key = key;
94      }
95  
96      public void waitFor() throws InterruptedException {
97          if (this.completed) {
98              return;
99          }
100         synchronized (this) {
101             while (!this.completed) {
102                 wait();
103             }
104         }
105     }
106 
107     public IOSession getSession() {
108         synchronized (this) {
109             return this.session;
110         }
111     }
112 
113     public IOException getException() {
114         synchronized (this) {
115             return this.exception;
116         }
117     }
118 
119     public void completed(final IOSession session) {
120         if (session == null) {
121             throw new IllegalArgumentException("Session may not be null");
122         }
123         if (this.completed) {
124             return;
125         }
126         this.completed = true;
127         synchronized (this) {
128             this.session = session;
129             if (this.callback != null) {
130                 this.callback.completed(this);
131             }
132             notifyAll();
133         }
134     }
135 
136     public void failed(final IOException exception) {
137         if (exception == null) {
138             return;
139         }
140         if (this.completed) {
141             return;
142         }
143         this.completed = true;
144         SelectionKey key = this.key;
145         if (key != null) {
146             key.cancel();
147             Channel channel = key.channel();
148             if (channel.isOpen()) {
149                 try {
150                     channel.close();
151                 } catch (IOException ignore) {}
152             }
153         }
154         synchronized (this) {
155             this.exception = exception;
156             if (this.callback != null) {
157                 this.callback.failed(this);
158             }
159             notifyAll();
160         }
161     }
162 
163     public void timeout() {
164         if (this.completed) {
165             return;
166         }
167         this.completed = true;
168         SelectionKey key = this.key;
169         if (key != null) {
170             key.cancel();
171             Channel channel = key.channel();
172             if (channel.isOpen()) {
173                 try {
174                     channel.close();
175                 } catch (IOException ignore) {}
176             }
177         }
178         synchronized (this) {
179             if (this.callback != null) {
180                 this.callback.timeout(this);
181             }
182         }
183     }
184 
185     public int getConnectTimeout() {
186         return this.connectTimeout;
187     }
188 
189     public void setConnectTimeout(int timeout) {
190         if (this.connectTimeout != timeout) {
191             this.connectTimeout = timeout;
192             SelectionKey key = this.key;
193             if (key != null) {
194                 key.selector().wakeup();
195             }
196         }
197     }
198 
199     public void cancel() {
200         if (this.completed) {
201             return;
202         }
203         this.completed = true;
204         SelectionKey key = this.key;
205         if (key != null) {
206             key.cancel();
207             Channel channel = key.channel();
208             if (channel.isOpen()) {
209                 try {
210                     channel.close();
211                 } catch (IOException ignore) {}
212             }
213         }
214         synchronized (this) {
215             if (this.callback != null) {
216                 this.callback.cancelled(this);
217             }
218             notifyAll();
219         }
220     }
221 
222 }