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<title>your first Ivy java application </title>
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<table width=100% border=0 cellpadding=0 cellspacing=0><tr><th colspan=3 align=center>
The Ivy java library guide</th></tr><tr>
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<h1>Your first Ivy java application</h1>
<p>We are going to write a "Hello world translater" for an Ivy bus. The
application will subscribe to all messages starting
with "Hello", and re-emit them after translating "Hello" into "Bonjour". In
addition, the application will quit when it receives any message containing
exactly "Bye".
<h2>The code</h2>
There is the code of <a href="ivyTranslater.java">ivyTranslater.java</a>:
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<PRE>
<FONT color=#c000c0>import</FONT> fr.dgac.ivy.* ;
<FONT color=#008000>class</FONT> ivyTranslater <FONT color=#008000>implements</FONT> IvyMessageListener {
<FONT color=#008000>private</FONT> Ivy bus;
ivyTranslater() {
<FONT color=#0000c0>// initialization</FONT>
bus = <FONT color=#804000>new</FONT> Ivy(<FONT color=#c00000>"IvyTranslater"</FONT>,<FONT color=#c00000>"Hello le monde"</FONT>,<FONT color=#c00000>null</FONT>);
bus.bindMsg(<FONT color=#c00000>"^Hello(.*)"</FONT>,<FONT color=#008000>this</FONT>);
bus.bindMsg(<FONT color=#c00000>"^Bye$"</FONT>,<FONT color=#804000>new</FONT> IvyMessageListener() {
<FONT color=#0000c0>// callback for </FONT><FONT color=#c00000>"Bye"</FONT><FONT color=#0000c0> message</FONT>
<FONT color=#008000>public</FONT> <FONT color=#008000>void</FONT> receive(IvyClient client, String[] args) {System.exit(<FONT color=#c00000>0</FONT>);}
});
<FONT color=#804000>try</FONT> {
<FONT color=#0000c0>// starts the bus on the default domain or IVY_DOMAIN property</FONT>
bus.start(<FONT color=#c00000>null</FONT>);
} <FONT color=#804000>catch</FONT> (IvyException ie) {
System.err.println(<FONT color=#c00000>"can't run the Ivy bus"</FONT> + ie.getMessage());
}
}
<FONT color=#0000c0>// callback associated to the </FONT><FONT color=#c00000>"Hello"</FONT><FONT color=#0000c0> messages</FONT><FONT color=#c00000>"</FONT>
<FONT color=#008000>public</FONT> <FONT color=#008000>void</FONT> receive(IvyClient client, String[] args) {
bus.sendMsg(<FONT color=#c00000>"Bonjour"</FONT>+((args.length><FONT color=#c00000>0</FONT>)?args[<FONT color=#c00000>0</FONT>]:<FONT color=#c00000>""</FONT>));
}
<FONT color=#008000>public</FONT> <FONT color=#008000>static</FONT> <FONT color=#008000>void</FONT> main(String args[]) { <FONT color=#804000>new</FONT> ivyTranslater(); }
}
</PRE>
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<h2>Compiling</h2>
<p>On a Unix computer, you should be able to compile the application with the
following command :
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$ javac ivyTranslater.java
<br>$
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<h2>Testing</h2>
<p>We are going to test our application with Probe. In a terminal window,
launch ivyTranslater:
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$ java ivyTranslater
<br>
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<p>Then in another terminal window, launch Probe. You are then ready to
start, Type "Hello Paul", and you should get "Bonjour Paul". Then Type "Bye",
and your application should quit :
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$ java fr.dgac.ivy.Probe '(.*)'
<br>you want to subscribe to (.*)
<br>broadcasting on 127.255.255.255:2010
<br>IvyTranslater connected
<br>IvyTranslater subscribes to ^Bye$
<br>IvyTranslater subscribes to ^Hello(.*)
<br>IvyTranslater sent 'Hello le monde'
<br><b>Hello Paul</b>
<br>-> Sent to 1 peers
<br>IvyTranslater sent 'Bonjour Paul'
<br><b>Bye</b>
<br>-> Sent to 1 peers
<br>IvyTranslater disconnected
<br><Ctrl-D>
<br>$
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<td width=33% align=left valign=top>The Ivy java library</td>
<td width=34% align=center valign=top> </td>
<td width=33% align=right valign=top>Basic functions</a></td>
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