[jira] [Comment Edited] (IGNITE-1370) StreamTupleExtractor should allow extracting multiple tuples from a single event

["Raúl Kripalani (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-1370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14729884#comment-14729884 ] 

Raúl Kripalani edited comment on IGNITE-1370 at 9/3/15 10:04 PM:
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There are two options off the top of my head:

# API-breaking one => modifying StreamTupleExtractor to add a second method returning a Map<K, V> and a method {{boolean supportsMultiple()}} for users to implement, so that Streamers can query the extractor to know which method to invoke.
# A new class {{StreamMultipleTupleExtractor}} that Streamers supporting this functionality can use. It would require streamers to hold two fields: singleTupleExtractor or multipleTupleExtractor (for example), for users to be able to set either.




was (Author: raulvk):
There are two options off the top of my head:

# API-breaking one => modifying StreamTupleExtractor to add a second method returning a Map<K, V> and a method {{boolean supportsMultiple()}} for users to implement, so that Streamers can query the extractor to know which method to invoke.

# A new class {{StreamMultipleTupleExtractor}} that Streamers supporting this functionality can use. It would require streamers to hold two fields: singleTupleExtractor or multipleTupleExtractor (for example), for users to be able to set either.



> StreamTupleExtractor should allow extracting multiple tuples from a single event
> --------------------------------------------------------------------------------
>
>                 Key: IGNITE-1370
>                 URL: https://issues.apache.org/jira/browse/IGNITE-1370
>             Project: Ignite
>          Issue Type: Improvement
>          Components: streaming
>    Affects Versions: ignite-1.4
>            Reporter: Raúl Kripalani
>            Assignee: Raúl Kripalani
>
> Currently the {{StreamTupleExtractor}} interface contains a single method:
> {code}
> public Map.Entry<K, V> extract(T msg);
> {code}
> Which only allows extracting a single Entry from an incoming event.
> In real life, it could be that an event contains multiple entries. 



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