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From "Mark Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NIFI-810) Create Annotation that indicates that a Processor cannot be scheduled to run without an incoming connection
Date Fri, 04 Sep 2015 19:33:47 GMT

    [ https://issues.apache.org/jira/browse/NIFI-810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14731304#comment-14731304
] 

Mark Payne commented on NIFI-810:
---------------------------------

[~aldrin]: thoughts on using an annotation like "@InputRequirement" that takes an enumeration
instead of @IgnoresInput and @RequestInput? Then you could use one of:

@InputRequirement(INPUT_REQUIRED)
@InputRequirement(INPUT_OPTIONAL)
@InputRequirement(INPUT_FORBIDDEN)

If the annotation is not present, it would be the same as using INPUT_OPTIONAL, which is how
this behaves now.

Not sure which way is cleaner: to have explicit annotations for each or to have an annotation
that accepts input?

> Create Annotation that indicates that a Processor cannot be scheduled to run without
an incoming connection
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-810
>                 URL: https://issues.apache.org/jira/browse/NIFI-810
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Mark Payne
>
> Currently, if a Processor has no incoming connections but is started, it will continually
without ever accomplishing anything. We should have an annotation, perhaps @RequiresInput,
that indicates that the Processor should not be scheduled to run unless it has an incoming
connection.



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