[HAPI-devel] RE: RE: message database

[Guevara, A. <Ale...@uh...>]

std way:

//create data object from message encapsulates code
//to extract data from the msg using the std methods like //getMSH().get... 

DataObject do = createDataObjectFromMessage( msg );
sink.store( do );


using visitor:

DataObjectCreatorVisitor v = 
	new DataObjectCreatorVisitor( 
		//these are the matching rules
		new String[] {
			"MSH-9-2",
			"^PID(?:|.*?){5}(.*)|"
		}
	);	

msg.accept( v );
sink.store( v.getDataObject() );

As you can see, using the Visitor pattern is just another way to do it. One
that usually tends to be more elegant and easier to use. (the idea is that
the hapi source code generator will generate the base visitor code, and even
some core visitors, like the DataObject creator). If we'll be using the
Visitor pattern only to implement the logging feature, then most probably it
will be an overkill...




-----Original Message-----
From: Tripp, Bryan 
Sent: April 29, 2003 3:36 PM
To: Guevara, Alexei
Subject: RE: RE: message database


You're far too happy ;)  Anyway, isn't loving a pattern an anti-pattern
("Golden Hammer")?   

I still don't see it for message logging.  Maybe if you wrote some
pseudocode?  

Bryan 

> -----Original Message-----
> From: Guevara, Alexei
> Sent: April 29, 2003 3:27 PM
> To: Tripp, Bryan
> Subject: RE: RE: message database
> 
> 
> 
> 
> I like it, but for some reason I can't think of any use cases.
> Anyone?
> 
> Message logging is a good candidate, we could have different visitors,
> each to log some piece of info of the message (or the whole message) 
> ... The visitor will construct the Data Object (the one that will be 
> thrown onto the DataSink) .....
> 
> It will provide as well the foundations for a more granular message
> processing mechanism ... we could even use it to extract a very 
> specific piece of data from a message ... and so on ... on and on ... 
> I love the visitor pattern ;)
> 
> alex6
> 
> 
> 
> 
> 
> 
> www.mailfiler.com [HAPI-devel]
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