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Java Manageability Programming Interface - JMPI

Author: Adrian Schuur, schuur@de.ibm.com  - 30 Apr 2004 -

First installment

   This installment of JMPI has been committed to the 2.4 branch.
   This installment has been build and tested on Suse 9.0 with Sun's j2sdk 1.4.2_04.


Environment settings

   In order to build this support a few environment variables have to used.
   The following script has been proven useful for setting up the build and execution environment.
   You might need to adjust this to your system layout.

   export PEGASUS_HOME=`pwd`
   export PEGASUS_PLATFORM=LINUX_IX86_GNU
   export PEGASUS_ENABLE_CMPI_PROVIDER_MANAGER=1
   export PEGASUS_ENABLE_JMPI_PROVIDER_MANAGER=1
   export PEGASUS_DEBUG=1
   export JAVA_SDK=/usr/java/j2sdk1.4.2_04
   export JAVA_SDKINC=$JAVA_SDK/include
   export LD_LIBRARY_PATH=$PEGASUS_HOME/lib:$JAVA_SDK/jre/lib/i386/server:$JAVA_SDK/jre/lib/i386/native_threads:$JAVA_SDK/jre/lib/i386
   export PATH=$JAVA_SDK/bin:$PATH
   export CLASSPATH=$PEGASUS_ROOT/src/Pegasus/ProviderManager2/JMPI
   export PATH=$PEGASUS_HOME/bin:$PATH
   export PEGASUS_ROOT=$PEGASUS_HOME
   export LD_ASSUME_KERNEL=2.2.5
   cd $PEGASUS_HOME

   There is now a new variable to determine which JVM to link with.  The choices are as follows:
	PEGASUS_JVM	sun	Sun's jvm (ex: j2sdk1.4.2_07)
	PEGASUS_JVM	ibm	IBM's jvm (ex: IBMJava2-142)
	PEGASUS_JVM	bea	Suse's IBM jvm (ex: BEAJava2-1.4.2)
   So, pick one and export that variable to the environment.  For example,
	export PEGASUS_JVM=sun
   NOTE: This is currently listened to for Linux builds.

   There are a couple of optional environment variables to determine how the JRE is initialized.  These are
   as follows (the variable name and what JRE option that it corresponds to):

   PEGASUS_JMPI_MAX_HEAP               -Xmx
   PEGASUS_JMPI_INITIAL_HEAP           -Xms
   PEGASUS_JMPI_JAVA_THREAD_STACK_SIZE -Xss

   So, for example, you would perform the following if you want to change the maximum heap size to 128 megabytes.

   export PEGASUS_JMPI_MAX_HEAP=128m

   There is a new environment variable that tells the JVM to output more debugging information.  The variable name 
   is called PEGASUS_JMPI_VERBOSE.  An example usage is as follows:

   export PEGASUS_JMPI_VERBOSE="jni,class"

   This will tell the JVM to output debug information on the JNI layer and class loading.

   When using this script, place a copy of this script above your PEGASUS_HOME directory.
   "cd" to PEGASUS_HOME, and issue ". ../setJPeg". Then do a normal make.


This installment has a number of restrictios:

   The provider interfaces follow the SNIA OpenWBEM APIs
   Only Instance and Association providers are supported at the moment.
	SetProperty and GetProperty CIM operations will crash cimserver
   Jar support is not yet implemented - all classes must be accessable via the CLASSPATH variabe.
   The Makefiles are not yet Pegasus conforming.
	cimmofl must be used for provider registration.

	Unloading of idle providers is not supported and Java will increase the memory footprint.


poststarttests

   This installment has a set of tests modelled after wetest/static. All tests work properly except
   the Property tests. I had to modify "diff" to "diff -w", why that is needed I do not understand.


Building poststarttests:

   cd to .../src/Pegasus/ProviderManager2/JMPI/org/pegasus/jmpi/tests/Load
   Issue "make"

   This will load a schema to the repository and register the provider.


Running poststarttests:

   cd to .../src/Pegasus/ProviderManager2/JMPI/org/pegasus/jmpi/tests
   Issue "find -name "*.rsp" -exec rm {} \;" to clean up *.rsp files
   Issue "make poststarttests"


Samples

   The provider used for posstarttest,
	.../JMPI/org/pegasus/jmpi/test/JMPI_TestPropertyTypes/JMPI_TestPropertyTest.java is a working
	example of how to code an JMPI tyle instance provider.
	This directors also constains the required Makefile.

	.../JMPI/org/pegasus/jmpi/sample contains more samples, one of which is an incomplete CIMClient
	sample.

	Notice that all provider classes must be accessibe via the CASSPATH environment setting.


Provider Registration

   JMPI providers are registered as usual. The Location property in P_ProviderModule has a special format.
	The format is: <jar-file-name>:<provider-class-name>

	Although jar support is not yet working correctly, this format must be used. You should use cimmofl
	for registration untill cimmof is prepared for JMPI.

   instance of PG_ProviderModule
   {
      Name = "JMPI_TestPropertyTypesModule";
      Location = "JMPI_TestPropertyTypes.jar:"
		           "org/pegasus/jmpi/tests/JMPI_TestPropertyTypes/JMPI_TestPropertyTypes";
      Vendor = "Pegasus Community";
      Version = "2.0.0";
      InterfaceType = "JMPI";
      InterfaceVersion = "1.0.0";
   };


Bug reports

   Use normal Pegasus bugzilla procedures to report malfunctions.


Regards, Adrian Schuur.