[infinispan-issues] [JBoss JIRA] (ISPN-3640) Extend KeyFilter facility to the whole cache

[Galder Zamarreño (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12936556#comment-12936556 ] 

Galder Zamarreño commented on ISPN-3640:
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There's quite a few benefits on this:
* It allows you to store multiple types in the same cache in a type-safe way.
* It would allow for queries on different types to work with a single cache (currently queries can only be executed on a single cache).
* For transactional caches, it'd be more performant to have a single cache with multiple types, that a cache for each type and get them to cooperate on the same transaction.
* Filtering applied by cache view could be done earlier on in the stack that any filtering that is applied at the cache listener level.
* Iteration would need some work to make sure that it only iterates over entries that pass the filter.
                
> Extend KeyFilter facility to the whole cache
> --------------------------------------------
>
>                 Key: ISPN-3640
>                 URL: https://issues.jboss.org/browse/ISPN-3640
>             Project: Infinispan
>          Issue Type: Feature Request
>          Components: Core API
>    Affects Versions: 6.0.0.CR1
>            Reporter: Paul Ferraro
>            Assignee: Mircea Markus
>
> The key filter facility is very convenient for users who have multiple key types in the same cache.  It would be very handy if this feature were extended to the whole cache.
> e.g.
> Cache<?, ?> cache = ...;
> KeyFilter filter = ...;
> Cache<K, V> view = cache.filter(filter);
> view.addListener(listener) // Equivalent to the current cache.addListener(listener, filter) method
> for (Map.Entry<K, V> entry: view.entrySet()) {
>    ...
> }

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