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From conflue...@apache.org
Subject [CONF] Apache MINA: UDP Tutorial (page edited)
Date Mon, 01 Dec 2008 12:54:02 GMT
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/MINA">MINA</a>
:
            <a href="http://cwiki.apache.org/confluence/display/MINA/UDP+Tutorial">UDP
Tutorial</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/MINA/UDP+Tutorial">UDP Tutorial</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~paliwalashish@gmail.com">Ashish
Paliwal</a>
            <span class="smallfont">(Dec 01, 2008)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=55665&originalVersion=5&revisedVersion=6">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><p>This tutorial is designed to help you
in writing a client and server using the MINA framework. In this tutorial we will write a
server that displays memory usage for clients.  This has some real world applicability in
that you can place similar logic into any program in order to monitor the amount of memory
that your program is using.</p>
<table cellpadding='5' width='85%' cellspacing='8px' class='infoMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/information.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Version
Note</b><br />This tutorial has been verified on MINA 2.0.0 M3.</td></tr></table>

<h2><a name="UDPTutorial-Buildingthecode"></a>Building the code</h2>

<p>For now MINA 2.0 isn't released, so you will have to build it yourself from apache
subversion server.  If you need assistance in building MINA from the  trunk, please consult
the <a href="/confluence/display/MINA/Developer+Guide" title="Developer Guide">Developer
Guide</a>.</p>

<h2><a name="UDPTutorial-TheApplication"></a>The Application</h2>
<p><div align="center"><img src="/confluence/download/attachments/55665/udpserver.PNG"
border="0" /></div><br/>
The figure above depicts the sample UDP server. The Server is listening on the port 18567.
The Client connects to the Server and sends the memory usage data. The figure above depicts
two clients connected to the Server.</p>

<h3><a name="UDPTutorial-TheApplicationExecutionFlow"></a>The Application
Execution Flow</h3>

<ol>
	<li>The Server listens for incoming requests on port 18567</li>
	<li>The Client connects to the Server. The Server adds a Tab on Session Created event</li>
	<li>The Clients sends memory usage data to Server</li>
	<li>The Server adds the data received from Client in the tab added in Step 2</li>
</ol>


<h2><a name="UDPTutorial-ServerCodeanalysis"></a>Server Code analysis</h2>

<p>We will begin by looking at the code found in the <tt>org.apache.mina.example.udp</tt>
package under <tt>mina-examples</tt>. To keep life simple, we shall concentrate
on MINA related constructs only.</p>

<p>To construct the server, we shall have to do the following:</p>
<ol>
	<li>Create a Datagram Socket to listen for incoming Client requests (See MemoryMonitor.java)</li>
	<li>Create an IoHandler to handle the MINA framework generated events (See MemoryMonitorHandler.java)</li>
</ol>


<p> Here is the first snippet that addresses Point# 1:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">NioDatagramAcceptor acceptor = <span class="code-keyword">new</span>
NioDatagramAcceptor();
acceptor.setHandler(<span class="code-keyword">new</span> MemoryMonitorHandler(<span
class="code-keyword">this</span>));</pre>
</div></div>
<p>Here, we create a NioDatagramAcceptor to listen for incoming Client requests, and
set the IoHandler.The variable 'PORT' is just an int.  The next step is to add a logging filter
to the filter chain that this <tt>DatagramAcceptor</tt> will use. LoggingFilter
is a very nice way to see MINA in Action. It generate log statements at various stages, providing
an insight into how MINA works.</p>
<div class="code"><div class="codeContent">
<pre class="code-java">DefaultIoFilterChainBuilder chain = acceptor.getFilterChain();
chain.addLast(<span class="code-quote">"logger"</span>, <span class="code-keyword">new</span>
LoggingFilter());</pre>
</div></div>
<p>Next we get into some more specific code for the UDP traffic.  We will set the acceptor
to reuse the address</p>
<div class="code"><div class="codeContent">
<pre class="code-java">DatagramSessionConfig dcfg = acceptor.getSessionConfig();
dcfg.setReuseAddress(<span class="code-keyword">true</span>);acceptor.bind(<span
class="code-keyword">new</span> InetSocketAddress(PORT));</pre>
</div></div>
<p>Of course the last thing that is required here is to call bind().</p>

<h3><a name="UDPTutorial-IoHandlerimplementation"></a>IoHandler implementation</h3>

<p>There are three major events of interest for our Server Implementation</p>
<ul>
	<li>Session Created</li>
	<li>Message Received</li>
	<li>Session Closed</li>
</ul>


<p>Lets look at each of them in detail</p>

<h4><a name="UDPTutorial-SessionCreatedEvent"></a>Session Created Event</h4>

<div class="code"><div class="codeContent">
<pre class="code-java">@Override
<span class="code-keyword">public</span> void sessionCreated(IoSession session)
<span class="code-keyword">throws</span> Exception {
     SocketAddress remoteAddress = session.getRemoteAddress();
     server.addClient(remoteAddress);
}  </pre>
</div></div>
<p>In the session creation event, we just call addClient() function, which internally
adds a Tab to the UI</p>

<h4><a name="UDPTutorial-MessageReceivedEvent"></a>Message Received Event</h4>

<div class="code"><div class="codeContent">
<pre class="code-java"> @Override
 <span class="code-keyword">public</span> void messageReceived(IoSession session,
<span class="code-object">Object</span> message) <span class="code-keyword">throws</span>
Exception {
        <span class="code-keyword">if</span> (message <span class="code-keyword">instanceof</span>
IoBuffer) {
            IoBuffer buffer = (IoBuffer) message;
            SocketAddress remoteAddress = session.getRemoteAddress();
            server.recvUpdate(remoteAddress, buffer.getLong());
        }
 }</pre>
</div></div>
<p>In the message received event, we just dump the data received in the message. Applications
that need to send responses, can process message and write the responses onto session in this
function.</p>

<h4><a name="UDPTutorial-SessionClosedEvent"></a>Session Closed Event</h4>

<div class="code"><div class="codeContent">
<pre class="code-java">@Override
<span class="code-keyword">public</span> void sessionClosed(IoSession session)
<span class="code-keyword">throws</span> Exception {
    <span class="code-object">System</span>.out.println(<span class="code-quote">"Session
closed..."</span>);
    SocketAddress remoteAddress = session.getRemoteAddress();
    server.removeClient(remoteAddress);
}</pre>
</div></div>
<p>In the Session Closed, event we just remove the Client tab from the UI</p>

<h2><a name="UDPTutorial-ClientCodeAnalysis"></a>Client Code Analysis</h2>

<p>In this section, I will try to explain the client code.  One note to make is that
I left out the debugging/logging for brevity's sake.  So here goes....</p>

<p>We will begin by looking at the file MemMonClient.java, found in the org.apache.mina.example.udp.client
java package.  The first few lines of the code are simple and straightforward.</p>
<div class="code"><div class="codeContent">
<pre class="code-java">connector = <span class="code-keyword">new</span>
NioDatagramConnector();
connector.setHandler( <span class="code-keyword">this</span> );
ConnectFuture connFuture = connector.connect( <span class="code-keyword">new</span>
InetSocketAddress(<span class="code-quote">"localhost"</span>, MemoryMonitor.PORT
));</pre>
</div></div>
<p>Here we create a <tt>DatagramConnector</tt>, set the handler and connect
to the server.  One gotcha I ran into was that you must set the host in the InetSocketAddress
object or else nothing seems to work.  This example was mostly written and tested on a Windows
XP machine, so things may be different elsewhere.  Next we will wait for acknowledgment that
the client has connected to the server.  Once we know we are connected, we can start writing
data to the server.  Here is that code:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">connFuture.addListener( <span class="code-keyword">new</span>
IoFutureListener(){
            <span class="code-keyword">public</span> void operationComplete(IoFuture
<span class="code-keyword">future</span>) {
                ConnectFuture connFuture = (ConnectFuture)<span class="code-keyword">future</span>;
                <span class="code-keyword">if</span>( connFuture.isConnected()
){
                    session = <span class="code-keyword">future</span>.getSession();
                    <span class="code-keyword">try</span> {
                        sendData();
                    } <span class="code-keyword">catch</span> (InterruptedException
e) {
                        e.printStackTrace();
                    }
                } <span class="code-keyword">else</span> {
                    log.error(<span class="code-quote">"Not connected...exiting"</span>);
                }
            }
        });</pre>
</div></div>
<p>Here we add a listener to the <tt>ConnectFuture</tt> object and when
we receive a callback that the client has connected, we will start to write data.  The writing
of data to the server will be handled by a method called sendData.  This method is shown below:</p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">private</span> void sendData()
<span class="code-keyword">throws</span> InterruptedException {
        <span class="code-keyword">for</span> (<span class="code-object">int</span>
i = 0; i &lt; 30; i++) {
            <span class="code-object">long</span> free = <span class="code-object">Runtime</span>.getRuntime().freeMemory();
            IoBuffer buffer = IoBuffer.allocate(8);
            buffer.putLong(free);
            buffer.flip();
            session.write(buffer);

            <span class="code-keyword">try</span> {
                <span class="code-object">Thread</span>.sleep(1000);
            } <span class="code-keyword">catch</span> (InterruptedException e)
{
                e.printStackTrace();
                <span class="code-keyword">throw</span> <span class="code-keyword">new</span>
InterruptedException(e.getMessage());
            }
        }
}</pre>
</div></div>
<p>This method will write the amount of free memory to the server once a second for
30 seconds.  Here you can see that we allocate a <tt>IoBuffer</tt> large enough
to hold a long variable and then place the amount of free memory in the buffer.  This buffer
is then flipped and written to the server.</p></div>


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