Marcel Reutegger updated OAK-4759:
    Attachment: OAK-4759.patch

Changed the proposal to use a marker interface. Using a flag on the filter 
previously allowed the listener to reregister and switch between a processor 
with a queue and one without. That would have been more tricky to implement.

> Queueless change processor
> --------------------------
>                 Key: OAK-4759
>                 URL: https://issues.apache.org/jira/browse/OAK-4759
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, documentmk, jcr
>            Reporter: Marcel Reutegger
>              Labels: observation
>             Fix For: 1.6
>         Attachments: OAK-4759.patch, OAK-4759.patch, jackrabbit-api.patch, 
> jackrabbit-api.patch
> The initial proposal for this improvement was:
> {quote}
> Change processing for listeners that are only interested in external
> events could be simplified because there is no commit info for
> external changes. The basic idea is that the node store implementation
> may be able to optimize batch processing of multiple external changes
> and does not need to process each external change individually. The
> DocumentNodeStore would use the journal to identify external changes
> and need to come up with a way to ignore overlapping local changes.
> With this new feature, expensive listeners that process local as well
> as external events could be split into two separate listeners, each
> optimized for the type of changes.
> {quote}
> Later the proposal was changed in a more general queueless change processor. 
> See first comment.

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