[jira] [Commented] (MAILBOX-364) Create an EventBus

["Tellier Benoit (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAILBOX-364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16721230#comment-16721230 ] 

Tellier Benoit commented on MAILBOX-364:
----------------------------------------

https://github.com/linagora/james-project/pull/2027 MAILBOX-364 Part 1: Migrate EventDelivery to Reactor

> Create an EventBus
> ------------------
>
>                 Key: MAILBOX-364
>                 URL: https://issues.apache.org/jira/browse/MAILBOX-364
>             Project: James Mailbox
>          Issue Type: New Feature
>          Components: events
>            Reporter: Tellier Benoit
>            Priority: Major
>
> The idea:
>  - The caller is reponsible of unsubscribing
>  - Clearly separate concerns between 'jobs' and 'registrations'
>  - Generify the concept of 'registration' so that I can register stuff on more that a mailbox.
> The API proposal:
> First let's create registration keys:
> {code:java}
> interface Key {
> }
> class MailboxIdKey implements Key {
>   MailboxId id;
> }
> class UserKey implements Key {
>   User user;
> }
> {code}
> Groups of workers:
> {code:java}
> interface Group {}
> interface QuotaUpdaterGroup extends Group {}
> {code}
> A registration: 
> {code:java}
> interface Registration {
>   void unregister();
> }
> {code}
> Then the event bus API:
> {code:java}
> interface EventBus {
>   Registration register(Listener listener, Key key);
>   Registration register(Listener listener, Group group);
>   CompletableFuture<Void> dispatch(Event event, Key key);
>   CompletableFuture<Void> dispatch(Event event, Set<Key> key);
> }
> {code}
> You will:
>  - Implement this API and related contract tests with a memory implementation



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