[infinispan-issues] [JBoss JIRA] (ISPN-2686) Enhance Mapper API with lazy loaded value

[Vladimir Blagojevic (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12947601#comment-12947601 ] 

Vladimir Blagojevic commented on ISPN-2686:
-------------------------------------------

This requires API changes - use of a new mapper interface. I'd say lets leave it and see if more people request something like this. I would rather not complicate things further unless it is really necessary. 
                
> Enhance Mapper API with lazy loaded value
> -----------------------------------------
>
>                 Key: ISPN-2686
>                 URL: https://issues.jboss.org/browse/ISPN-2686
>             Project: Infinispan
>          Issue Type: Enhancement
>          Components: Distributed Execution and Map/Reduce
>    Affects Versions: 5.2.0.Beta6
>            Reporter: Thomas Fromm
>            Assignee: Vladimir Blagojevic
>            Priority: Minor
>
> In situations where Map/Reduce is used and the value is not (always) needed at the Mapper, the value could be loaded lazy, when the map(..) interface is slightly changed:
> map(Entry<KIn, VIn> entry, Collector<Entry<KIn, VIn>> collector) 
> When entry.getValue() is called, the value should be loaded from store or maybe remote node.
> Maybe this change to Entry would be also useful for event api ISPN-1802

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