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

[Sanne Grinovero (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-3640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12939976#comment-12939976 ] 

Sanne Grinovero commented on ISPN-3640:
---------------------------------------

I love this idea, but let's aim at making it consistent (eventually) with all features:
 - CacheStore filtering operations (would be great to have a "type column" in the jdbc one for example, incredibily useful for the JPA one)
 - Map/Reduce jobs to operate on the subset only
 - queries

As usual the _clear()_ operation stands out as the troublemaker.
                
> 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
>    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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