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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3348) Allow Observers to completely override base function
Date Tue, 14 Dec 2010 20:46:04 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Purtell updated HBASE-3348:
----------------------------------

    Attachment: HBASE-3348.patch

Patch contains API changes and fixes some logic bugs I found with coprocessor integration
in HRegion. Not quite ready yet, will put up a new patch on RB then.

> Allow Observers to completely override base function
> ----------------------------------------------------
>
>                 Key: HBASE-3348
>                 URL: https://issues.apache.org/jira/browse/HBASE-3348
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>             Fix For: 0.92.0
>
>         Attachments: HBASE-3348.patch
>
>
> Currently an observer can act as a filter or translator but cannot stop a subsequent
call down to the base method for get, put, delete, etc. This means an observer cannot completely
override the base function. To deal with this we can:
> - Change the preXXX methods to return the same type as the postXXX methods, the same
return type of the base method. 
> - Extend {{Coprocessor.Environment}} with methods that get/set a "should continue" flag.

> The framework should check the "should continue" flag before calling the base method.
If not, just return what was returned by the preXXX method. 

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