[infinispan-dev] Feedback and requests on clustered and remote listeners

Galder Zamarreño galder at redhat.com
Tue Sep 23 12:20:35 EDT 2014

On 23 Sep 2014, at 14:53, Mircea Markus <mmarkus at redhat.com> wrote:

> On Sep 23, 2014, at 15:18, Emmanuel Bernard <emmanuel at hibernate.org> wrote:
>>> I am not sold on this as it seems pretty trivial to decipher which
>>> operation is which and the information would be present on the
>>> javadocs as well.
>> I very strongly disagree. Cf the other thread with Radim 's comment on topology error. 
>> And think about *future* evolutions. The enum would make that much safer. In the bin enum world you would have to introduce a new YetAnotherKeyValueFilter interface :)
> Nicer than an enum would be an explicit method, e.g. handlePut/handleDelete/handleCreate/handleUpdate, as these would also receive the appropriate param list.

^ Hmmmmm, not sure I like that. If you look at the remote event blog posts, you’ll see that I use create/modify/remove annotations and then the parameter to the callback varies depending on whether you had converter applied to it or not. IOW, without a converter, a created event parameter is a ClientCacheEntryCreatedEvent, whereas with a converter, the parameter is a ClientCacheEntryCustomEvent. Two different types of events for the same event type. If you did it with explicit methods, you’d have to duplicate them for custom events.

> Of course this means moving away from the KeyValueFilter to an UpdateFilter (good name, Radim) used only for cluster listeners. 

I don’t like the name actually. I associate update with modifications, and in similar vein, inserts with creation and delete with removals. 

> Will, what would be the overall impact on the API as right now the KeyValueFilter is reused between several components, like the cluster iterator.
> Cheers,
> -- 
> Mircea Markus
> Infinispan lead (www.infinispan.org)
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Galder Zamarreño
galder at redhat.com

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