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Java > Open Source Codes > org > apache > mina > transport > socket > nio > support > DatagramFilterChain


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.util.Queue JavaDoc;
23
24 import org.apache.mina.common.ByteBuffer;
25 import org.apache.mina.common.IoFilter.WriteRequest;
26 import org.apache.mina.common.IoFilterChain;
27 import org.apache.mina.common.IoSession;
28 import org.apache.mina.common.support.AbstractIoFilterChain;
29
30 /**
31  * An {@link IoFilterChain} for datagram transport (UDP/IP).
32  *
33  * @author The Apache Directory Project (mina-dev@directory.apache.org)
34  */
35 class DatagramFilterChain extends AbstractIoFilterChain {
36
37     DatagramFilterChain(IoSession parent) {
38         super(parent);
39     }
40
41     @Override JavaDoc
42     protected void doWrite(IoSession session, WriteRequest writeRequest) {
43         DatagramSessionImpl s = (DatagramSessionImpl) session;
44         Queue JavaDoc<WriteRequest> writeRequestQueue = s.getWriteRequestQueue();
45
46         // SocketIoProcessor.doFlush() will reset it after write is finished
47 // because the buffer will be passed with messageSent event.
48 ((ByteBuffer) writeRequest.getMessage()).mark();
49         synchronized (writeRequestQueue) {
50             writeRequestQueue.add(writeRequest);
51             if (writeRequestQueue.size() == 1
52                     && session.getTrafficMask().isWritable()) {
53                 // Notify DatagramService only when writeRequestQueue was empty.
54 s.getManagerDelegate().flushSession(s);
55             }
56         }
57     }
58
59     @Override JavaDoc
60     protected void doClose(IoSession session) {
61         DatagramSessionImpl s = (DatagramSessionImpl) session;
62         DatagramService manager = s.getManagerDelegate();
63         if (manager instanceof DatagramConnectorDelegate) {
64             manager.closeSession(s);
65         } else {
66             ((DatagramAcceptorDelegate) manager).getListeners()
67                     .fireSessionDestroyed(session);
68             session.getCloseFuture().setClosed();
69         }
70     }
71 }
72
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