Trần Tiến Đức created JAMES-2641:
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Summary: Replace MailboxDispatcher & Delegating listener by the
new event bus
Key: JAMES-2641
URL: https://issues.apache.org/jira/browse/JAMES-2641
Project: James Server
Issue Type: Improvement
Reporter: Trần Tiến Đức
You will make James use APIs defined in new EventBus instead than the previous
one.
You will remove:
- `MailboxListenerSupport API`
- `MailboxEventDispatcher` class
- `DelegatingMailboxListener` & sub classes
Rather than calling Mailbox Support, call the EventBus
Note that:
- EventBus initialization should never be done in the MailboxManager (a ready
to use EventBus should be passed to it).
This can be done in 2 steps:
- Keeping the MailboxManager as a proxy
- Then in a second PR directly calling the EventBus
**edited**
improvement: `MailboxEventDisplatcher` exposes some convenience methods for
easily creating events. We need, as part of `EventFactory` to propose builders
for Mailbox events.
Note that as part of this effort, we need to get rid of the
MailboxEventDispatcher whose last responsibility is "not firing noop events".
We need to move the `isNoop()` method to the Event API in order to be able to
filter our noop event without having knowledge of the event details. Filtering
noop should then be a responsibility of the EventBus (and as a temporary step
of the DelegatingMailboxListener). In order to filter noop in an agnostic way,
we need to add a `isnoop()` method in the event bus.
Once these 2 preliminary steps are done we can:
- Remove the `MailboxEventDispatcher` (event emition can then directly be done
on top of the delegatingListener/EventBus=
- Replace the DelegatingListener by the EventBus.
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