bloritsch 2002/09/26 11:34:55
Added: event/src/xdocs cpuparser-howto.xml
Log:
oops, now I am committing the CPUParser-howto docs.
Revision Changes Path
1.1 jakarta-avalon-excalibur/event/src/xdocs/cpuparser-howto.xml
Index: cpuparser-howto.xml
===================================================================
<?xml version="1.0"?>
<document>
<header>
<title>Excalibur Event - How To Extend System Util</title>
<authors>
<person name="Berin Loritsch" email="[EMAIL PROTECTED]"/>
</authors>
</header>
<body>
<s1 title="System Util Design">
<p>
SystemUtil determins which CPUParser it needs by examining
the results from <code>System.getProperty( "os.name" )</code>.
It strips all the whitespace from the name, and appends it
to the <code>org.apache.excalibur.util.system</code> package.
For example, if the "os.name" property returns "Windows XP",
then the full class name needs to be
<code>org.apache.excalibur.util.system.WindowsXP</code>.
</p>
</s1>
<s1 title="Writing a CPUParser">
<p>
Writing a CPUParser is not hard. You only need to know
how to name your implementation, and then write the relevant
logic. All CPUParser implementations must be in the
<code>org.apache.excalibur.util.system</code> package and
implement the CPUParser interface. The example below is
taken from the WindowsXP CPUParser included in this project.
</p>
<source>
<![CDATA[
package org.apache.excalibur.util.system;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.apache.excalibur.util.CPUParser;
/**
* Parses the Windows XP environment
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Berin Loritsch</a>
* @version CVS $Revision: 1.1 $ $Date: 2002/09/26 18:34:55 $
*/
public final class WindowsXP implements CPUParser
{
private final int m_processors;
private final String m_cpuInfo;
/**
* Create this instance of CPUParser and gather information from
* the Windows XP system.
*/
public WindowsXP()
{
int procs = 1;
String info = "";
try
{
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec( "cmd.exe /C echo %NUMBER_OF_PROCESSORS%" );
BufferedReader reader = new BufferedReader( new InputStreamReader(
proc.getInputStream() ) );
String numProcs = reader.readLine();
proc = rt.exec( "cmd.exe /C echo %PROCESSOR_IDENTIFIER%" );
reader = new BufferedReader( new InputStreamReader(
proc.getInputStream() ) );
info = reader.readLine();
procs = Integer.parseInt( numProcs );
}
catch( Exception e )
{
}
m_processors = procs;
m_cpuInfo = info;
}
/**
* Return the number of processors available on the machine
*/
public int numProcessors()
{
return m_processors;
}
/**
* Return the cpu info for the processors (assuming symetric multiprocessing
* which means that all CPUs are identical). The format is:
*
* ${arch} family ${family} Model ${model} Stepping ${stepping}, ${identifier}
*/
public String cpuInfo()
{
return m_cpuInfo;
}
}
]]>
</source>
</s1>
</body>
<footer>
<legal>
Copyright (c) @year@ The Jakarta Apache Project All rights reserved.
$Revision: 1.1 $ $Date: 2002/09/26 18:34:55 $
</legal>
</footer>
</document>
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