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

["Anton Vinogradov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16192728#comment-16192728 ] 

Anton Vinogradov commented on IGNITE-425:
-----------------------------------------

[~NIzhikov]
I'll try to review this month.

> 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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