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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-425) Introduce transformers for continuous queries
Date Sun, 21 Jan 2018 17:57:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16333611#comment-16333611
] 

Vladimir Ozerov commented on IGNITE-425:
----------------------------------------

Re-targeting for 2.5 release, too serious impact for last-minute merge.

> Introduce transformers for continuous queries
> ---------------------------------------------
>
>                 Key: IGNITE-425
>                 URL: https://issues.apache.org/jira/browse/IGNITE-425
>             Project: Ignite
>          Issue Type: Sub-task
>          Components: cache
>    Affects Versions: 2.2
>            Reporter: Yakov Zhdanov
>            Assignee: Nikolay Izhikov
>            Priority: Major
>             Fix For: 2.5
>
>
> Currently if updated entry passes the filter, it is sent to node initiated the query
entirely. It would be good to provide user with the ability to transform entry and, for example,
select only fields that are important. This may bring huge economy to traffic and lower GC
pressure as well.
> Possible signatures will be:
> {noformat}
> public final class ContinuousQuery<K, V, T> {..} // T is a type transformer transforms
to
> public ContinuousQuery<K, V, T> setLocalListener(Listener<T> locLsnr) {..}
// Probably, we will have to introduce new listener type, since user may want to wipe out
key as well.
> /* new method to add */
> public ContinuousQuery<K, V, T> setRemoteTransformerFactory(Factory<? extends
ContinuousQueryTransformer<K, V, T>> factory) { ..}
> {noformat}



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