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20 package org.apache.mina.examples.udpecho;
21
22 import java.net.InetSocketAddress;
23 import java.net.SocketAddress;
24 import java.nio.ByteBuffer;
25
26 import org.apache.mina.api.AbstractIoHandler;
27 import org.apache.mina.api.IdleStatus;
28 import org.apache.mina.api.IoFilter;
29 import org.apache.mina.api.IoSession;
30 import org.apache.mina.filter.logging.LoggingFilter;
31 import org.apache.mina.filterchain.ReadFilterChainController;
32 import org.apache.mina.filterchain.WriteFilterChainController;
33 import org.apache.mina.session.WriteRequest;
34 import org.apache.mina.transport.nio.NioUdpServer;
35 import org.slf4j.Logger;
36 import org.slf4j.LoggerFactory;
37
38
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40
41
42
43 public class NioUdpEchoServer {
44 static final Logger LOG = LoggerFactory.getLogger(NioUdpEchoServer.class);
45
46 public static void main(final String[] args) {
47 LOG.info("starting echo server");
48
49 final NioUdpServer server = new NioUdpServer();
50
51
52 server.setFilters(new LoggingFilter("LoggingFilter1"), new IoFilter() {
53
54 @Override
55 public void sessionOpened(final IoSession session) {
56 LOG.info("session {} open", session);
57 }
58
59 @Override
60 public void sessionIdle(final IoSession session, final IdleStatus status) {
61 LOG.info("session {} idle", session);
62 }
63
64 @Override
65 public void sessionClosed(final IoSession session) {
66 LOG.info("session {} open", session);
67 }
68
69 @Override
70 public void messageWriting(final IoSession session, WriteRequest message,
71 final WriteFilterChainController controller) {
72
73 controller.callWriteNextFilter(message);
74 }
75
76 @Override
77 public void messageReceived(final IoSession session, final Object message,
78 final ReadFilterChainController controller) {
79
80 if (message instanceof ByteBuffer) {
81 LOG.info("echoing");
82 session.write(message);
83 }
84 }
85
86 @Override
87 public void messageSent(final IoSession session, final Object message) {
88 LOG.info("message {} sent", message);
89 }
90 });
91
92 server.setIoHandler(new AbstractIoHandler() {
93 @Override
94 public void sessionOpened(final IoSession session) {
95 LOG.info("session opened {}", session);
96
97 final String welcomeStr = "welcome\n";
98 final ByteBuffer bf = ByteBuffer.allocate(welcomeStr.length());
99 bf.put(welcomeStr.getBytes());
100 bf.flip();
101 session.write(bf);
102
103 }
104 });
105
106 try {
107 final SocketAddress address = new InetSocketAddress(9999);
108 server.bind(address);
109 LOG.debug("Running the server for 25 sec");
110 Thread.sleep(25000);
111 LOG.debug("Unbinding the UDP port");
112 server.unbind();
113 } catch (final InterruptedException e) {
114 LOG.error("Interrupted exception", e);
115 }
116 }
117 }