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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +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 Stats Example</title>
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5 </head>
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6 <body>
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7 <h1>Blitz Stats Example</h1>
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8
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9 <h2>Introduction</h2>
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11 This example provides a simple demonstration of how to use the <code>org.dancres.blitz.stats</code> package.
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12
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13 <h2>Compiling</h2>
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14
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15 The example consists of two classes:
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17 <ol>
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18 <li><a href="../examples/statsclient/stats/Lookup.java">Lookup</a> which handles service lookup.</li>
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19 <li><a href="../examples/statsclient/stats/TestClient.java">TestClient</a> which actually manipulates the stats interfaces.</li>
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20 </ol>
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22 In order to compile these classes you will require the following <code>.jar</code>'s:
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24 <ul>
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25 <li><code>jsk-platform.jar, jsk-lib.jar</code> from the JINI 2.x distribution.</li>
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26 <li><code>stats.jar</code> from the Blitz distribution. This <code>.jar</code> contains classes which <em>must</em> be available to the client when it is run (they cannot be downloaded). Note that the proxy code in <code>blitz-dl.jar</code> will be downloaded as usual.</li>
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27 </ul>
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29 Assuming that your JINI 2.x 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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31 <pre>
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32 cd /blitz/examples/statsclient
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33
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34 javac -classpath /jini2_1/lib/jsk-lib.jar:/jini/jini2_1/lib/jsk-platform.jar:/blitz/lib/stats.jar *.java
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35 </pre>
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36
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37 <h2>Running</h2>
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38
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39 <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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41 Having compiled the example, you can run it as follows (with the same assumptions about installation locations as above):
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43 <pre>
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44 cd /blitz
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45
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46 java -Djava.security.policy=config/policy.all -classpath /jini2_1/lib/jsk-lib.jar:/jini2_1/lib/jsk-platform.jar:/blitz/examples/statsclient:/blitz/lib/stats.jar stats.TestClient
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47 </pre>
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48
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49 <h2>Configuring Defaults</h2>
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51 In addition to passing an array of Switch objects to Blitz via the StatsAdmin interface, it's possible to configure default settings via the config file using an entry like:
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53 <pre>
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54 // Default Stats to make available
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55 stats = new Switch[] {new OpSwitch(OpSwitch.ALL_TYPES, OpSwitch.TAKE_OPS, true),
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56 new OpSwitch(OpSwitch.ALL_TYPES, OpSwitch.READ_OPS, true),
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57 new OpSwitch(OpSwitch.ALL_TYPES, OpSwitch.WRITE_OPS, true)};
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58 </pre>
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59
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60 <p><div align="center"><a href="../index.html">Back to Documentation</a></div></p>
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61 </body>
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62 </html>