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

[Radim Vansa]

On 09/24/2014 08:16 AM, Galder Zamarreño wrote:
> On 23 Sep 2014, at 19:02, William Burns <mudokonman at gmail.com> wrote:
>
>> On Tue, Sep 23, 2014 at 12:20 PM, Galder Zamarreño <galder at redhat.com> wrote:
>>> 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.
>> This is for embedded and is done in the filter and converter (not in
>> the listener).  Unless I am missing something this shouldn't directly
>> affect the client methods.
> Ah ok.
>
>>>> 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.
>> What would you suggest?  A few things I thought of quickly:
>> CacheOperationFilter, CacheEventFilter, CacheWriteFilter - the only
>> reason I preface Cache is because we have CacheManager events as well.
> Maybe CacheEventFilter...

Does expiration trigger clustered listeners? 'Event' sounds quite 
generic, I would expect the EventFilter to be able to handle 
expirations, invalidations, evictions etc., maybe even reads as well 
(whether through separate methods or enums).

ModificationFilter could be better (in TX I think we use term 
'modifications' for all CUD ops), but we have already used 
CacheEntryModified for 'update'.


>
>>>> 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
>>> twitter.com/galderz
>>>
>>>
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>
> --
> Galder Zamarreño
> galder at redhat.com
> twitter.com/galderz
>
>
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-- 
Radim Vansa <rvansa at redhat.com>
JBoss DataGrid QA