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From "Valentin Kulichenko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-2546) Need to introduce transformers to SCAN queries
Date Thu, 11 Feb 2016 03:00:23 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-2546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Valentin Kulichenko updated IGNITE-2546:
----------------------------------------
    Description: 
Need to add new method to {{IgniteCache}} API:

{code}
public <T, R> QueryCursor<R> query(Query<T> qry, IgniteClosure<T, R>
transformer);
{code}

For {{SqlFieldsQuery}} we should throw {{UnsupportedOperationException}}.

  was:
Need to introduce new query type:

{code}
public final class ScanTransformQuery<K, V, R> extends Query<R> {
    private final IgniteBiPredicate<K, V> filter;
    private final int part;
    private final IgniteClosure<Cache.Entry<K, V>, R> transformer;
    
    // ... Constructors, getters, setters, etc. Use ScanQuery class as a template.
}
{code}

Transformer is mandatory. If it's not set, the exception should be thrown suggesting to use
{{ScanQuery}} instead.


> Need to introduce transformers to SCAN queries
> ----------------------------------------------
>
>                 Key: IGNITE-2546
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2546
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Valentin Kulichenko
>            Assignee: Sergi Vladykin
>             Fix For: 1.6
>
>
> Need to add new method to {{IgniteCache}} API:
> {code}
> public <T, R> QueryCursor<R> query(Query<T> qry, IgniteClosure<T,
R> transformer);
> {code}
> For {{SqlFieldsQuery}} we should throw {{UnsupportedOperationException}}.



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