[jira] [Commented] (IGNITE-425) Introduce transformers for continuous queries

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16109112#comment-16109112 ] 

ASF GitHub Bot commented on IGNITE-425:
---------------------------------------

GitHub user nizhikov opened a pull request:

    https://github.com/apache/ignite/pull/2372

    IGNITE-425: Implementation of ContinuousQueryWithTransformer

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/nizhikov/ignite IGNITE-425

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/ignite/pull/2372.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2372
    
----
commit a188dfa481796fe554085a9c729e327740d6242e
Author: Nikolay Izhikov <ni...@gmail.com>
Date:   2017-08-01T15:37:49Z

    IGNITE-425: Implementation of ContinuousQueryWithTransformer

----


> 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
>            Reporter: Yakov Zhdanov
>            Assignee: Nikolay Izhikov
>
> 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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