[jira] [Created] (JAMES-3559) JMAP PUSH: window events on the server side?

["Benoit Tellier (Jira)" <se...@james.apache.org>]

Benoit Tellier created JAMES-3559:
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             Summary: JMAP PUSH: window events on the server side?
                 Key: JAMES-3559
                 URL: https://issues.apache.org/jira/browse/JAMES-3559
             Project: James Server
          Issue Type: Improvement
          Components: JMAP
    Affects Versions: 3.6.0
            Reporter: Benoit Tellier
            Assignee: Antoine Duprat


h3. Why?

Today a JAMES action might trigger several events being dispatched on the event bus (eg moving 2 messages will end up firing 2 additions and 2 deletion) resulting in likely 4 StateChanges being pushed to the end user.

h3. How?

Using the reactor library, James can likely delay pushes for a given timewindow and merge the state changes together in order to supply the client with only one state change.

A likely time value might be 2 seconds.

 - Pros: avoid event storm and will lower re-synchronization request count (good for perf?)
 - Cons: delays of 2s for real time across devices.

We could of course make it configurable via a jmap.properties configuration.


{code:java}
# Optional. Omiting this property leads to windowing being disables. James will 
# then directly forward all StateChanges to the end user without attempting to 
# buffer and aggregating them.
# If specified, James will delay stateChanges for that given amout of time and will attempt 
# to aggregate subsequent state changes together before returning them to the client.
# Units: ms, s, min, h, d
push.aggregation.window.duration=2s
{code}

Thoughts [~inputmice] maybe?



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