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[dsdp-tm-dev] FTP Listing Parser Extension Point

Hello Javier,

thanks for moving the FTP Listing Parser extension point
from Services to the Subsystem. Seeing the code, I'm 
actually more convinced than ever that this was the 
right move -- the dropdown and extension point handling 
are now all nicely in one plugin.

There is just few concerns I still have:

1. Avoid early plugin activation for extensions.
   In FTPClientConfigFactory line 61, you do a
   "createExectuableExtension". Because of that,
   all plugins which contribute FTP parsers are
   activated. This should be deferred to later.
   Somebody contributing a VXWORKS parser should not
   be activated if the VXWORKS parser is not chosen
   or not applicable.
   The class should only be loaded when the parser
   is really used.

2. Translatable label of the FTP Parser extension.
   According to your .exsd, the "name" attribute
   is marked not translatable (although the description
   says "displayed in the UI").
   Please change the "name" attribute into an "id" attribute
   which is used internally only; and add a "label" attribute
   which is translatable and shown in the UI.
   Only like that, we can
     a) guarantee that no two extenders provide an extension
        with exactly the same name -- they can use notation
        like "com.windriver.ftp.parser.VXWORKS"
     b) guarantee that in a multi-lingual team, if member A
        has Eclipse translated to Swedish and member B to
        English, they can still share the same configuration
     c) guarantee that programs operating based on a well-
        known ID of a parser always find the right parser

3. Autodetect.
   As I have mentioned before, the AUTO special parser should
   not be restricted to the preconfigured parsers only. User
   contributed parsers should also be considered.
   For doing that, I'd suggest that the extension has an 
   additional attribute "ftpSystemTypes" holding a regular
   expression to be matched against the result of the FTP
   SYST command. If multiple parsers match, they should be
   tried one after the other. An RSEDelegatingFtpListingParser
   could do this work.

See my previous E-Mail comments that I sent you below for reference. 

Martin Oberhuber
Wind River Systems, Inc.
Target Management Project Lead, DSDP PMC Member 



From: Oberhuber, Martin 
Sent: Friday, April 20, 2007 6:10 PM
To: javier.montalvoorus@xxxxxxxxxxx
Cc: Target Management developer discussions
Subject: New FTP Listing Parser Extension Point

Hello Javier,

two more considerations:

*	We should avoid having to activate plugins which contribute FTP
parsers, just in order to check whether they are valid. Therefore, the
extension point should have another attribute "systemNames" which should
contain a regular expression that needs to match the system name
reported by the remote side. If it matches, AUTO would activate the
plugin, instantiate the parser, and try that parser on that system. 


Oberhuber, Martin schrieb: 

	Hello Javier,
	I looked at your patch and it looks good to me.
	I have no time right now to test it with VxWorks, but I'm
	that it will work fine. Your patch looks sizeable, so please go
	and commit it.
	What I would like to see going forward, is the ability that the 
	"AUTO" parser type also tries the various contributed parsers.
	Right now, when I'm not mistaken, any extender-contributed
	parser will only be used when explicitly selected by the user.
	This is not user-friendly. We should allow extenders to
	parsers, but the system should be able to select the contributed
	parsers automatically wherever possible. In the simplest case, 
	the parser contribution could have an 
	   boolean isValidFor(String systemType)
	method that allows auto-selecting it based on the systemType
	returned by the remote. In case multiple contributed parsers
	return TRUE for isValidFor(), they could be tried one after the
	other while parsing, until the first one is successful.
	Martin Oberhuber
	Wind River Systems, Inc.
	Target Management Project Lead, DSDP PMC Member <>

Martin Oberhuber
Wind River Systems, Inc.
Target Management Project Lead, DSDP PMC Member

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