RE: Shutdown Merlin gracefully

Aaron,

No, prob.  Thanks for the reply and the additional info.

Regards,
Mansour
:-)


-----Original Message-----
From: Farr, Aaron [mailto:[email protected]] 
Sent: Monday, August 30, 2004 2:52 PM
To: 'Avalon framework users'
Subject: RE: Shutdown Merlin gracefully

Hello Mansour!

Sorry to not reply faster.  I'm really behind on emails. :)

> -----Original Message-----
> From: Mansour Raad [mailto:[email protected]]
>
> Is there a way to shutdown Merlin programmatically ? rather than a Ctrl-
> C !

I think Stephen already answered this one pretty well.  Basically, if you're
willing to write your own bootstrap code, then you can control Merlin anyway
you want.  Look at the Merlin CLI interface for an example of how this
works.

Otherwise you'll have to wait until we get the console and/or JMX facilities
working.

> In addition, how do you startup Merlin as a windows service with a
> specified block ?

There's a Merlin 3.3.0 windows installer that automatically installs Merlin
as an NT service.  It uses the Java Service Wrapper and you'll need to look
at the wrapper.conf file for the details.

This is the way I do it:

1. Install a basic instance of Merlin somewhere on the PC.  Let's say it's
   C:\merlin

2. Now for each Merlin application I have a separate folder.  Say C:\app1
   and C:\app2.  These can be anything.  We'll call them the "app homes",
   okay?  The layout for a single app will look like:

   C:\app1
          merlin.properties
          \conf
               block.xml
               config.xml
               wrapper.conf
          \logs


3. The merlin.properties file will look something like:

# Example merlin.properties file
merlin.deployment=file:///${merlin.dir}/conf/block.xml   
merlin.override=file:///${merlin.dir}/conf/config.xml

Which means that if you run 'merlin' from C:\app1 you will automatically
launch the conf/block.xml and use the conf/config.xml file for configuration
overrides.  $merlin.dir means "the directory from which the merlin command
was run."


4. For each application create a wrapper.conf file and use the Java Service
Launcher to create a new Merlin service.  The wrapper.conf file will even
entries like:

#********************************************************************
# Wrapper parameters
#********************************************************************
# Java Application
wrapper.java.command=%JAVA_HOME%/bin/java

# Java Main class
wrapper.java.mainclass=org.tanukisoftware.wrapper.WrapperSimpleApp

# Java Classpath (include wrapper.jar)  Add class path elements as
#  needed starting from 1
wrapper.java.classpath.1=%MERLIN_HOME%/bin/nt/wrapper.jar
wrapper.java.classpath.2=%MERLIN_HOME%/system/merlin/jars/merlin-cli-3.3.0.j
ar

# Java Library Path (location of Wrapper.DLL or libwrapper.so)
wrapper.java.library.path.1=%MERLIN_HOME%/bin/nt
wrapper.java.library.path.2=%JAVA_HOME%/bin
#wrapper.java.library.path.append_system_path=true

# Java Additional Parameters
wrapper.java.additional.1=-server
wrapper.java.additional.2=-Djava.security.policy=%MERLIN_HOME%/bin/security.
policy

# Initial Java Heap Size (in MB)
wrapper.java.initmemory=3

# Maximum Java Heap Size (in MB)
wrapper.java.maxmemory=64


# Application parameters.  Add parameters as needed starting from 1
wrapper.app.parameter.1=org.apache.avalon.merlin.cli.Main
wrapper.app.parameter.2=-info



So running "wrapper.exe -i conf/wrapper.conf" will create your application
service.  You'll need to get an understanding of the Java Service Wrapper
(http://wrapper.tanukisoftware.org/doc/english/introduction.html) to pull
this off.

Hopefully this gives you something to start with.  If you have more
questions, please ask.

jaaron  

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