chibenwa opened a new pull request #380:
URL: https://github.com/apache/james-project/pull/380
## 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.
## 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.
```
# 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
```
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