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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.example.udp.client;
21  
22  import java.net.InetSocketAddress;
23  
24  import org.apache.mina.core.buffer.IoBuffer;
25  import org.apache.mina.core.future.ConnectFuture;
26  import org.apache.mina.core.future.IoFutureListener;
27  import org.apache.mina.core.service.IoConnector;
28  import org.apache.mina.core.service.IoHandlerAdapter;
29  import org.apache.mina.core.session.IdleStatus;
30  import org.apache.mina.core.session.IoSession;
31  import org.apache.mina.example.udp.MemoryMonitor;
32  import org.apache.mina.transport.socket.nio.NioDatagramConnector;
33  import org.slf4j.Logger;
34  import org.slf4j.LoggerFactory;
35  
36  /**
37   * Sends its memory usage to the MemoryMonitor server.
38   *
39   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
40   */
41  public class MemMonClient extends IoHandlerAdapter {
42  
43      private final static Logger LOGGER = LoggerFactory.getLogger(MemMonClient.class);
44  
45      private IoSession session;
46  
47      private IoConnector connector;
48  
49      /**
50       * Default constructor.
51       */
52      public MemMonClient() {
53  
54          LOGGER.debug("UDPClient::UDPClient");
55          LOGGER.debug("Created a datagram connector");
56          connector = new NioDatagramConnector();
57  
58          LOGGER.debug("Setting the handler");
59          connector.setHandler(this);
60  
61          LOGGER.debug("About to connect to the server...");
62          ConnectFuture connFuture = connector.connect(new InetSocketAddress(
63                  "localhost", MemoryMonitor.PORT));
64  
65          LOGGER.debug("About to wait.");
66          connFuture.awaitUninterruptibly();
67  
68          LOGGER.debug("Adding a future listener.");
69          connFuture.addListener(new IoFutureListener<ConnectFuture>() {
70              public void operationComplete(ConnectFuture future) {
71                  if (future.isConnected()) {
72                      LOGGER.debug("...connected");
73                      session = future.getSession();
74                      try {
75                          sendData();
76                      } catch (InterruptedException e) {
77                          e.printStackTrace();
78                      }
79                  } else {
80                      LOGGER.error("Not connected...exiting");
81                  }
82              }
83          });
84      }
85  
86      private void sendData() throws InterruptedException {
87          for (int i = 0; i < 30; i++) {
88              long free = Runtime.getRuntime().freeMemory();
89              IoBuffer buffer = IoBuffer.allocate(8);
90              buffer.putLong(free);
91              buffer.flip();
92              session.write(buffer);
93  
94              try {
95                  Thread.sleep(1000);
96              } catch (InterruptedException e) {
97                  e.printStackTrace();
98                  throw new InterruptedException(e.getMessage());
99              }
100         }
101     }
102 
103     @Override
104     public void exceptionCaught(IoSession session, Throwable cause)
105             throws Exception {
106         cause.printStackTrace();
107     }
108 
109     @Override
110     public void messageReceived(IoSession session, Object message)
111             throws Exception {
112         LOGGER.debug("Session recv...");
113     }
114 
115     @Override
116     public void messageSent(IoSession session, Object message) throws Exception {
117         LOGGER.debug("Message sent...");
118     }
119 
120     @Override
121     public void sessionClosed(IoSession session) throws Exception {
122         LOGGER.debug("Session closed...");
123     }
124 
125     @Override
126     public void sessionCreated(IoSession session) throws Exception {
127         LOGGER.debug("Session created...");
128     }
129 
130     @Override
131     public void sessionIdle(IoSession session, IdleStatus status)
132             throws Exception {
133         LOGGER.debug("Session idle...");
134     }
135 
136     @Override
137     public void sessionOpened(IoSession session) throws Exception {
138         LOGGER.debug("Session opened...");
139     }
140 
141     public static void main(String[] args) {
142         new MemMonClient();
143     }
144 }