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<h1>Blitz HelloWorld Example</h1>

<h2>Introduction</h2>

<p>This example provides a simple demonstration of how to use a JavaSpace (it is not Blitz specific).
</p>

<h2>Compiling</h2>

The example consists of four classes:

<ol>
<li><a href="../examples/helloworld/Lookup.java">Lookup</a> which handles service lookup.</li>
<li><a href="../examples/helloworld/Writer.java">Writer</a> which generates Entry's.</li>
<li><a href="../examples/helloworld/Taker.java">Taker</a> which takes Entry's.</li>
<li><a href="../examples/helloworld/TestEntry.java">TestEntry</a> which is the Entry class.</li>
</ol>

In order to compile these classes you will require the following <code>.jar</code>'s:

<ul>
<li><code>jsk-lib.jar, jsk-platform.jar from the JINI 2.x distribution.</li>
</ul>

Assuming that your JINI 2.1 distribution is in <code>/jini2_1</code> and your Blitz distribution is in <code>/blitz</code>, you can compile the example as follows:

<pre>
cd /blitz/examples/helloworld

javac -classpath /jini2_1/lib/jsk-lib.jar:/jini2_1/lib/jsk-platform.jar *.java
</pre>

<h2>Running</h2>

<p>Before starting the example, ensure that you have a Blitz instance running in a public lookup group - see the <a href="install_guide.html">Installation Guide</a>.  This is necessary because the <code>Lookup</code> class does a single lookup and discover step - it does not register with discovered lookup services.  Thus, if a Blitz instance isn't registered beforehand, it will not be found (I'll fix this in a future release!).</p>

<p>We are now ready to run the example.  First, we'll start the taker - open a new terminal window and then:
</p>

<pre>
cd /blitz

java -Djava.security.policy=config/policy.all -classpath /jini2_1/lib/jsk-lib.jar:/jini2_1/lib/jsk-platform.jar:/blitz/examples/ helloworld.Taker
</pre>

Now we'll run the Writer - open a new terminal window and then:

<pre>
cd /blitz

java -Djava.security.policy=config/policy.all -classpath /jini2_1/lib/jsk-lib.jar:/jini2_1/lib/jsk-platform.jar:/blitz/examples/ helloworld.Writer
</pre>

<p>The Taker will exit automatically when it hasn't taken an Entry in the last 60 seconds.</p>

<h2>More Material</h2>

<p>For more examples see:</p>

<ol>
<li><a href="http://www.incax.com/examples.htm#jsip">JavaSpaces in Practice Examples</a></li>
<li><a href="https://bodega.dev.java.net/">Bodega Project</a></li>
</ol>

<p>For JavaSpaces resources see <a href="http://www.dancres.org/cottage/javaspaces.html">here</a></p>

<p><div align="center"><a href="../index.html">Back to Documentation</a></div></p>
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author	Dominic Cleal <dominic-cleal@cdo2.com>
date	Thu, 05 Aug 2010 11:07:25 +0100
parents	3dc0c5604566
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