GitHub user zjffdu opened a pull request:

    https://github.com/apache/zeppelin/pull/2858

    ZEPPELIN-3315. Merge beforeStatusChange and afterStatusChange to 
onStatusChange

    ### What is this PR for?
    The signature of `beforeStatusChange` & `afterStatusChange` include both 
the status of before and after, so it is not necessary to create both 
`beforeStatusChange` & `afterStatusChange`. Only one method `onStatusChange` is 
sufficient. 
    
    ### What type of PR is it?
    [Refactoring]
    
    ### Todos
    * [ ] - Task
    
    ### What is the Jira issue?
    * https://issues.apache.org/jira/browse/ZEPPELIN-3315
    
    ### How should this be tested?
    * CI pass
    
    ### Screenshots (if appropriate)
    
    ### Questions:
    * Does the licenses files need update? No
    * Is there breaking changes for older versions? No
    * Does this needs documentation? No


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/zjffdu/zeppelin ZEPPELIN-3315

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/zeppelin/pull/2858.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2858
    
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commit f0fe59455cdcb239dab9213b9ed21c1105f61f51
Author: Jeff Zhang <zjffdu@...>
Date:   2018-03-12T02:12:51Z

    ZEPPELIN-3315. Merge beforeStatusChange and afterStatusChange to 
onStatusChange

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