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From "Roman Shtykh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-1370) StreamTupleExtractor should allow extracting multiple tuples from a single event
Date Tue, 10 Nov 2015 02:01:10 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-1370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14997848#comment-14997848
] 

Roman Shtykh commented on IGNITE-1370:
--------------------------------------

Your first design idea (modifying StreamTupleExtractor to add a second method returning a
Map<K, V>) is better for real use cases.
In some cases if you want to initialize a user-specified extractor you have no knowledge of.
For instance, from a configuration file you have to do the following
{code}
Class<Some_Extractor> clazz =  (Class<Some_Extractor>)Class.forName(tupleExtractorCls);
then create new instance
{code}
What should be Some_Extractor? Single or multiple?


> 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
>             Fix For: 1.5
>
>
> 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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