Overview:
---------
The ComputerSystem sample demonstrates a more realistic example of
how JavaSPL can be used to write system management policies for a WinXP system. 
It also shows how custom expressions can be added.

The org/apache/imperius/javaspl/samples/windowscomputersystem/WindowsComputerSystem.java
class encapsulates all the relevant information about the system that is required to make
a policy based decision.

The org/apache/imperius/javaspl/samples/windowscomputersystem/WindowsSystemManager.java
is the driver class that embeds the JavaSPL processor.

Custom Expressions:
-------------------
We define a new action operator called SendMail that sends out an email using javax.mail
APIs.
The custom operator is defined in org/apache/imperius/samples/userdefinedmethods/SendMail.java 
The customexpressions.properties has an entry that tells the SPL processor that it needs
to add SendMail to its list of available operators.
If SendMail is packaged as a seperate jar then it needs to be on the classpath
for the SPL processor to load it at runtime.



Policies:
---------
1. Java_compliance: This policy checks for the JDK and WinXP versions for compliance.
In case of a violation it sends out an email.

2. Java_FileSystem: This policy checks for the amount of free space on the file system.
If it falls below a specified threshold then it kicks off the windows cleanup mgr and
sends out an email.


Prerequisites:
--------------
1. ANTLR 2.7.7 : Can be downloaded from http://www.antlr2.org. Make sure to set 
		 the ANTLR_HOME environment variable
2. Java mail API: Can be downloaded from 
	http://www.javaworld.com/jw-10-2001/jw-1026-javamail.html

3. JavaBeans activation framework: Can be downloaded from 
	http://java.sun.com/products/javabeans/jaf/downloads/index.html

4. Java 142: The java executable must be on the path.

5. Ensure that an JAVA_MAIL_HOME is set to the folder where the 
mail.jar and activation.jar are downloaded.


Configuring the Windows Cleanup manager:
---------------------------------------
We setup different profiles for the Windows cleanup manager
that will get invoked during policy execution depending on amount of free space remaining.

1. Open a command prompt and run 

- cleanmgr /sageset:256
From the dialog box that pops up select Recycle Bin and deselect 
others. Close the window

- cleanmgr /sageset:64 and choose Temporary Internet files only.
Close the window

-cleanmgr /sageset:32 and choose Temporary setup files only



Running the samples:
--------------------

For the compliance sample execute the runcompliance.bat
For the free space on filesystem sample execute runfilesystemdemo.bat