[jira] Resolved: (HBASE-3348) Allow Observers to completely override base function

["Andrew Purtell (JIRA)" <ji...@apache.org>]

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

Andrew Purtell resolved HBASE-3348.
-----------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Committed the updated patch. Thanks for the reviews Ryan and Jon. Reopen if more needed here.

> 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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