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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GEODE-1577) Unhelpful generic types on Execution.execute
Date Thu, 13 Apr 2017 17:18:42 GMT

    [ https://issues.apache.org/jira/browse/GEODE-1577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15967909#comment-15967909
] 

ASF subversion and git services commented on GEODE-1577:
--------------------------------------------------------

Commit bd40bcac75aa61b128849d68b88cd8df08b40f3e in geode's branch refs/heads/feature/GEODE-2632
from [~huynhja]
[ https://git-wip-us.apache.org/repos/asf?p=geode.git;h=bd40bca ]

GEODE-1577: modified MultiRegionFunctionExecutor to fix compilation error


> Unhelpful generic types on Execution.execute
> --------------------------------------------
>
>                 Key: GEODE-1577
>                 URL: https://issues.apache.org/jira/browse/GEODE-1577
>             Project: Geode
>          Issue Type: Bug
>          Components: functions
>            Reporter: Dan Smith
>
> The execute methods of the function service Execution class returns a ResultCollector
with wildcards for the type.
> {code}  
> public ResultCollector<?, ?> execute(
>       Function function) throws FunctionException;
> {code}
> Wildcards are supposed to be used in APIs where the type doesn't matter, for example
counting the elements in a list. By returning a ResultCollector with wildcards, we're essentially
forcing the user to cast the result collector.
> At a minimum they should be able to pick the type of result collector
> {code}
>   public <T,S> ResultCollector<T, S> execute(
>       Function function) throws FunctionException;
> {code}
> But maybe it would make more sense to parameterize Execution itself. Then the compiler
could ensure that the types used by withCollector and the types used by execute match.



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