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Add some cache/memory statistics to help spot potential exhaustion and other tuning issues.
author Dan Creswell <dan.creswell@gmail.com>
date Fri, 28 Aug 2009 17:23:33 +0100
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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2 <html>
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3 <head>
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4 <title>Blitz HelloWorld Example</title>
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5 <link rel="stylesheet" type="text/css" href="ssl.css" />
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6 </head>
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7 <body>
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8 <h1>Blitz HelloWorld Example</h1>
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10 <h2>Introduction</h2>
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11
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12 <p>This example provides a simple demonstration of how to use a JavaSpace (it is not Blitz specific).
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13 </p>
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15 <h2>Compiling</h2>
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16
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17 The example consists of four classes:
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19 <ol>
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20 <li><a href="../examples/helloworld/Lookup.java">Lookup</a> which handles service lookup.</li>
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21 <li><a href="../examples/helloworld/Writer.java">Writer</a> which generates Entry's.</li>
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22 <li><a href="../examples/helloworld/Taker.java">Taker</a> which takes Entry's.</li>
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23 <li><a href="../examples/helloworld/TestEntry.java">TestEntry</a> which is the Entry class.</li>
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24 </ol>
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25
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26 In order to compile these classes you will require the following <code>.jar</code>'s:
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28 <ul>
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29 <li><code>jsk-lib.jar, jsk-platform.jar from the JINI 2.x distribution.</li>
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30 </ul>
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32 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:
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33
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34 <pre>
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35 cd /blitz/examples/helloworld
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37 javac -classpath /jini2_1/lib/jsk-lib.jar:/jini2_1/lib/jsk-platform.jar *.java
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38 </pre>
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39
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40 <h2>Running</h2>
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41
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42 <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>
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43
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44 <p>We are now ready to run the example. First, we'll start the taker - open a new terminal window and then:
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45 </p>
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47 <pre>
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48 cd /blitz
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50 java -Djava.security.policy=config/policy.all -classpath /jini2_1/lib/jsk-lib.jar:/jini2_1/lib/jsk-platform.jar:/blitz/examples/ helloworld.Taker
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51 </pre>
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52
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53 Now we'll run the Writer - open a new terminal window and then:
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54
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55 <pre>
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56 cd /blitz
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57
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58 java -Djava.security.policy=config/policy.all -classpath /jini2_1/lib/jsk-lib.jar:/jini2_1/lib/jsk-platform.jar:/blitz/examples/ helloworld.Writer
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59 </pre>
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60
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61 <p>The Taker will exit automatically when it hasn't taken an Entry in the last 60 seconds.</p>
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62
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63 <h2>More Material</h2>
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64
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65 <p>For more examples see:</p>
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66
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67 <ol>
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68 <li><a href="http://www.incax.com/examples.htm#jsip">JavaSpaces in Practice Examples</a></li>
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69 <li><a href="https://bodega.dev.java.net/">Bodega Project</a></li>
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70 </ol>
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71
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72 <p>For JavaSpaces resources see <a href="http://www.dancres.org/cottage/javaspaces.html">here</a></p>
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73
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74 <p><div align="center"><a href="../index.html">Back to Documentation</a></div></p>
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75 </body>
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76 </html>