RE: Embedding Merlin in Main method

Hi Steve,

I am trying to do the following. Please let me know
what could be the better way for achiving this.

All the examples that I looked at are executing all
the components while running Merlin from command line,
instaed I am looking for an example that executes a
given component name. In other words, I was not able
to find an example that triggers an event that
executes a component.

I browsed through Merlin website and source code and
found "Embedding Merlin in a Main method" and an
AbstractMerlinTestCase class that has a method
resolve. I thought of using this approach to execute a
given component name. 


For your information, My component "/tahiti/simple" is
getting executed when I run using the Merlin command
line , with the same environment that I tried the
"Embedding Merlin in a Main method". I have attached a
file that conatins code snippets which I used for
testing.

Is my approach correct or do you have any other idea.
Could you please help me with this. 


For your quick reference here is the code snippet




+++++++++++++++++++++++++++++++++++++++++++++++++++++++



	public static void main(String[] args)	{
		ClassLoader classloader =
Framework.class.getClassLoader();
		
        File repository = new File( getMavenHome(),
"repository" );
        File basedir = getBaseDirectory();

        Map criteria = null;
		org.apache.avalon.repository.provider.Factory
factory = null;
		try {
			Artifact artifact = 
			  DefaultBuilder.createImplementationArtifact( 
			    classloader, 
			    getMerlinHome(),
			    basedir, 
			    MERLIN_PROPERTIES, 
			    IMPLEMENTATION_KEY );

			InitialContextFactory icFactory = 
			  new DefaultInitialContextFactory( "merlin",
basedir );
			icFactory.setCacheDirectory( repository );
			InitialContext context =
icFactory.createInitialContext();

			Builder builder = new DefaultBuilder( context,
artifact );
			m_classloader = builder.getClassLoader();
			factory = builder.getFactory();
			criteria = factory.createDefaultCriteria();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

            // go ahead with the deployment of the
kernel
            //

            try {
				m_kernel = factory.create( criteria );
				m_shutdown =
				  m_kernel.getClass().getMethod( 
				    "shutdown", 
				    new Class[0] );
				Method method = 
				  m_kernel.getClass().getMethod( 
				    "getModel", 
				    new Class[0] );
				m_root = method.invoke( m_kernel, new Object[0] );
				m_locate = 
				  m_root.getClass().getMethod( 
				    "getModel", 
				    new Class[]{ String.class } );
				Class modelClass = 
				  m_classloader.loadClass(
DEPLOYMENT_MODEL_CLASSNAME );
				m_resolve = 
				  modelClass.getMethod( "resolve", new Class[0] );
				initialized = true;
			} catch (SecurityException e3) {
				// TODO Auto-generated catch block
				e3.printStackTrace();
			} catch (IllegalArgumentException e3) {
				// TODO Auto-generated catch block
				e3.printStackTrace();
			} catch (NoSuchMethodException e3) {
				// TODO Auto-generated catch block
				e3.printStackTrace();
			} catch (IllegalAccessException e3) {
				// TODO Auto-generated catch block
				e3.printStackTrace();
			} catch (InvocationTargetException e3) {
				// TODO Auto-generated catch block
				e3.printStackTrace();
			} catch (ClassNotFoundException e3) {
				// TODO Auto-generated catch block
				e3.printStackTrace();
			} catch (Exception e3) {
				// TODO Auto-generated catch block
				e3.printStackTrace();
			}
	}




	    public Object resolve( String path ) throws
Exception
	    {
	        if( null == m_kernel ) 
	          throw new IllegalStateException( "kernel
does not exist" );

	        try
	        {
	            Object model =  m_locate.invoke( m_root,
new Object[]{ path } );
	            return m_resolve.invoke( model, new
Object[0] );
	        }
	        catch( InvocationTargetException ite )
	        {
	            Throwable cause =
ite.getTargetException();
	            final String error =
ExceptionHelper.packException( cause, true );
	            throw new Exception( error );
	        }
	        catch( Throwable e )
	        {
	            final String error =
ExceptionHelper.packException( e, true );
	            throw new Exception( error );
	        }
	    }



+++++++++++++++++++++++++++++++++++++++++++++++++++++++


regards,
Subbu







--- Stephen McConnell <[email protected]> wrote:

> 
> 
> From the following we can see that your deployment
> scenario is
> presumable defined within the kernel because your
> not declaring any
> deployment targets.  
> 
> 
> >   ${merlin.kernel} ==
> file:/D:/merlin/config/kernel.xml
> >   ${merlin.deployment} ==
> 
> 
> Later on in the trace we can see that your
> classloader definition isn't
> adding much - in fact it not adding anything in the
> classpath, and
> reasonably there are no component types located.
> 
> 
> > [DEBUG  ] (classloader): base: ${merlin.dir}
> > [DEBUG  ] (classloader): classpath:
> > [DEBUG  ] (classloader.types): type install count:
> 0
> > [DEBUG  ] (classloader.types): type registration
> complete
> 
> 
> Moving on with what is in effect an empty container
> ...
> 
> > [DEBUG  ] (kernel): state: initializing
> > [DEBUG  ] (kernel): kernel established
> > [DEBUG  ] (kernel): state: initialized
> > [DEBUG  ] (kernel): install phase
> > [DEBUG  ] (kernel): customize phase
> > [DEBUG  ] (kernel): startup phase
> > [DEBUG  ] (kernel): application assembly
> > [DEBUG  ] (kernel): state: assembly
> > [DEBUG  ] (): assembly phase
> > [DEBUG  ] (kernel): application deployment
> > [DEBUG  ] (kernel): state: deployment
> > [DEBUG  ] (kernel): state: started
> > Calling HelloWorld in Test
> > [DEBUG  ] (): Can't find 'tahiti' in model
> repository:
> > {}
> > java.lang.Exception: ---- runtime exception report
> > --------------------------------------------------
> > Exception: java.lang.IllegalArgumentException
> > Message: Unable to locate a container with name
> > [tahiti] within the container [[/]].
> 
> Which is a perfectly reasonable situation - you're
> asking for a
> component that does not exist.
> 
> Can we roll back a bit here and provide a summary of
> what exactly are
> you trying to do (sorry if you have already provided
> this info).  Anyway
> - seems to me you may be going about it the wrong
> way.
> 
> Stephen.
> 
> 
> 
>
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