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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.mina.transport.socket.nio.support;
21  
22  import java.net.SocketAddress;
23  import java.net.SocketException;
24  import java.nio.channels.DatagramChannel;
25  import java.nio.channels.SelectionKey;
26  import java.util.Queue;
27  import java.util.concurrent.ConcurrentLinkedQueue;
28  
29  import org.apache.mina.common.BroadcastIoSession;
30  import org.apache.mina.common.IoFilterChain;
31  import org.apache.mina.common.IoHandler;
32  import org.apache.mina.common.IoService;
33  import org.apache.mina.common.IoServiceConfig;
34  import org.apache.mina.common.IoSession;
35  import org.apache.mina.common.IoSessionConfig;
36  import org.apache.mina.common.RuntimeIOException;
37  import org.apache.mina.common.TransportType;
38  import org.apache.mina.common.IoFilter.WriteRequest;
39  import org.apache.mina.common.support.BaseIoSession;
40  import org.apache.mina.transport.socket.nio.DatagramServiceConfig;
41  import org.apache.mina.transport.socket.nio.DatagramSessionConfig;
42  
43  /**
44   * An {@link IoSession} for datagram transport (UDP/IP).
45   *
46   * @author The Apache Directory Project (mina-dev@directory.apache.org)
47   * @version $Rev: 585050 $, $Date: 2007-10-16 07:57:53 +0200 (Tue, 16 Oct 2007) $
48   */
49  class DatagramSessionImpl extends BaseIoSession implements BroadcastIoSession {
50      private final IoService wrapperManager;
51  
52      private final IoServiceConfig serviceConfig;
53  
54      private final DatagramSessionConfig config = new SessionConfigImpl();
55  
56      private final DatagramService managerDelegate;
57  
58      private final DatagramFilterChain filterChain;
59  
60      private final DatagramChannel ch;
61  
62      private final Queue<WriteRequest> writeRequestQueue;
63  
64      private final IoHandler handler;
65  
66      private final SocketAddress localAddress;
67  
68      private final SocketAddress serviceAddress;
69  
70      private SocketAddress remoteAddress;
71  
72      private SelectionKey key;
73  
74      private int readBufferSize;
75  
76      /**
77       * Creates a new instance.
78       */
79      DatagramSessionImpl(IoService wrapperManager,
80              DatagramService managerDelegate, IoServiceConfig serviceConfig,
81              DatagramChannel ch, IoHandler defaultHandler,
82              SocketAddress serviceAddress, SocketAddress localAddress) {
83          this.wrapperManager = wrapperManager;
84          this.managerDelegate = managerDelegate;
85          this.filterChain = new DatagramFilterChain(this);
86          this.ch = ch;
87          this.writeRequestQueue = new ConcurrentLinkedQueue<WriteRequest>();
88          this.handler = defaultHandler;
89          this.remoteAddress = ch.socket().getRemoteSocketAddress();
90  
91          this.serviceAddress = serviceAddress;
92          this.localAddress = localAddress;
93          this.serviceConfig = serviceConfig;
94  
95          // Apply the initial session settings
96          IoSessionConfig sessionConfig = serviceConfig.getSessionConfig();
97          if (sessionConfig instanceof DatagramSessionConfig) {
98              DatagramSessionConfig cfg = (DatagramSessionConfig) sessionConfig;
99              this.config.setBroadcast(cfg.isBroadcast());
100             this.config.setReceiveBufferSize(cfg.getReceiveBufferSize());
101             this.config.setReuseAddress(cfg.isReuseAddress());
102             this.config.setSendBufferSize(cfg.getSendBufferSize());
103 
104             if (this.config.getTrafficClass() != cfg.getTrafficClass()) {
105                 this.config.setTrafficClass(cfg.getTrafficClass());
106             }
107         }
108     }
109 
110     public IoService getService() {
111         return wrapperManager;
112     }
113 
114     public IoServiceConfig getServiceConfig() {
115         return serviceConfig;
116     }
117 
118     public IoSessionConfig getConfig() {
119         return config;
120     }
121 
122     DatagramService getManagerDelegate() {
123         return managerDelegate;
124     }
125 
126     public IoFilterChain getFilterChain() {
127         return filterChain;
128     }
129 
130     DatagramChannel getChannel() {
131         return ch;
132     }
133 
134     SelectionKey getSelectionKey() {
135         return key;
136     }
137 
138     void setSelectionKey(SelectionKey key) {
139         this.key = key;
140     }
141 
142     public IoHandler getHandler() {
143         return handler;
144     }
145 
146     @Override
147     protected void close0() {
148         IoServiceConfig config = getServiceConfig();
149         if (config instanceof DatagramServiceConfig) {
150             ((DatagramServiceConfig) config).getSessionRecycler().remove(this);
151         }
152         filterChain.fireFilterClose(this);
153     }
154 
155     Queue<WriteRequest> getWriteRequestQueue() {
156         return writeRequestQueue;
157     }
158 
159     @Override
160     protected void write0(WriteRequest writeRequest) {
161         filterChain.fireFilterWrite(this, writeRequest);
162     }
163 
164     public TransportType getTransportType() {
165         return TransportType.DATAGRAM;
166     }
167 
168     public SocketAddress getRemoteAddress() {
169         return remoteAddress;
170     }
171 
172     void setRemoteAddress(SocketAddress remoteAddress) {
173         this.remoteAddress = remoteAddress;
174     }
175 
176     public SocketAddress getLocalAddress() {
177         return localAddress;
178     }
179 
180     public SocketAddress getServiceAddress() {
181         return serviceAddress;
182     }
183 
184     @Override
185     protected void updateTrafficMask() {
186         managerDelegate.updateTrafficMask(this);
187     }
188 
189     int getReadBufferSize() {
190         return readBufferSize;
191     }
192 
193     private class SessionConfigImpl extends DatagramSessionConfigImpl implements
194             DatagramSessionConfig {
195         @Override
196         public int getReceiveBufferSize() {
197             try {
198                 return ch.socket().getReceiveBufferSize();
199             } catch (SocketException e) {
200                 throw new RuntimeIOException(e);
201             }
202         }
203 
204         @Override
205         public void setReceiveBufferSize(int receiveBufferSize) {
206             if (DatagramSessionConfigImpl.isSetReceiveBufferSizeAvailable()) {
207                 try {
208                     ch.socket().setReceiveBufferSize(receiveBufferSize);
209                     // Re-retrieve the effective receive buffer size.
210                     receiveBufferSize = ch.socket().getReceiveBufferSize();
211                     DatagramSessionImpl.this.readBufferSize = receiveBufferSize;
212                 } catch (SocketException e) {
213                     throw new RuntimeIOException(e);
214                 }
215             }
216         }
217 
218         @Override
219         public boolean isBroadcast() {
220             try {
221                 return ch.socket().getBroadcast();
222             } catch (SocketException e) {
223                 throw new RuntimeIOException(e);
224             }
225         }
226 
227         @Override
228         public void setBroadcast(boolean broadcast) {
229             try {
230                 ch.socket().setBroadcast(broadcast);
231             } catch (SocketException e) {
232                 throw new RuntimeIOException(e);
233             }
234         }
235 
236         @Override
237         public int getSendBufferSize() {
238             try {
239                 return ch.socket().getSendBufferSize();
240             } catch (SocketException e) {
241                 throw new RuntimeIOException(e);
242             }
243         }
244 
245         @Override
246         public void setSendBufferSize(int sendBufferSize) {
247             if (DatagramSessionConfigImpl.isSetSendBufferSizeAvailable()) {
248                 try {
249                     ch.socket().setSendBufferSize(sendBufferSize);
250                 } catch (SocketException e) {
251                     throw new RuntimeIOException(e);
252                 }
253             }
254         }
255 
256         @Override
257         public boolean isReuseAddress() {
258             try {
259                 return ch.socket().getReuseAddress();
260             } catch (SocketException e) {
261                 throw new RuntimeIOException(e);
262             }
263         }
264 
265         @Override
266         public void setReuseAddress(boolean reuseAddress) {
267             try {
268                 ch.socket().setReuseAddress(reuseAddress);
269             } catch (SocketException e) {
270                 throw new RuntimeIOException(e);
271             }
272         }
273 
274         @Override
275         public int getTrafficClass() {
276             if (DatagramSessionConfigImpl.isGetTrafficClassAvailable()) {
277                 try {
278                     return ch.socket().getTrafficClass();
279                 } catch (SocketException e) {
280                     throw new RuntimeIOException(e);
281                 }
282             } else {
283                 return 0;
284             }
285         }
286 
287         @Override
288         public void setTrafficClass(int trafficClass) {
289             if (DatagramSessionConfigImpl.isSetTrafficClassAvailable()) {
290                 try {
291                     ch.socket().setTrafficClass(trafficClass);
292                 } catch (SocketException e) {
293                     throw new RuntimeIOException(e);
294                 }
295             }
296         }
297     }
298 }