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From "angela (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-249) Webdav: Review usage of command chains
Date Tue, 11 Oct 2005 10:45:37 GMT
Webdav: Review usage of command chains
--------------------------------------

         Key: JCR-249
         URL: http://issues.apache.org/jira/browse/JCR-249
     Project: Jackrabbit
        Type: Improvement
    Reporter: angela
 Assigned to: angela 


i'd like to review the usage of command chains for import/export within the simple webdav
server.

while the concept of command chains offers a lot of flexibility, it showed that the implementation
generates some drawbacks. a new mechanism should take advantage of the experiences made with
the command chains.

from my point of view the following issues should be taken into consideration:

- provide means to extend and modify the import/export logic with minimal effort

- consistent import/export functionality for both collections and non-collections
  > export/import should not be completely separated.
  > interfaces should encourage consistency
  > increase maintainability, reduce no of errors

- distinction of collections and non-collections for import/export behaviour
  > PUT must result in non-coll, MKCOL in collection

- allow to defined a set of import/export-handlers with a given order.

- the different handlers must not rely on each other.

- an import/export should be completed after the first handler indicates success. there 
  should not be other classes involved in order to complete the import/export.

- avoid huge configuration files and if possible, avoid program flow being defined outside
of java code.

- avoid duplicate configuration (e.g. resource-filtering), duplicate code, duplicate logic,
that is 
  hard to maintain.

- additonal logic should be defined within a given import/export handler.
  however, in case of webdav i see limited value of using extra logic such as addMixin or
checkin, 
  that are covered by  webdav methods (such as LOCK, VERSION-CONTROL or CHECKIN).

regards
angela




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