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From Bryan Bende <bbe...@gmail.com>
Subject Re: Help required with my custom controller service
Date Mon, 10 Aug 2015 20:23:11 GMT
Not sure if this is helpful, but there is a section about adding
dependencies on controller services at the end of this wiki page:

https://cwiki.apache.org/confluence/display/NIFI/Maven+Projects+for+Custom+Processors


On Monday, August 10, 2015, Mark Payne <markap14@hotmail.com> wrote:

> Brandon,
>
> I've seen this occur when I forgot to add a dependency on the
> ssl-context-service-api-nar in my NAR's pom.
>
> You should have something like:
> <dependency>
>   <groupId>org.apache.nifi</groupId>
>   <artifactId>ssl-context-service-api</artifactId>
>   <version>0.3.0-SNAPSHOT</version>
>   <type>nar</type>
> </dependency>
>
> Is that by chance the issue, or is there something else going on?
>
> Thanks
> -Mark
>
> ----------------------------------------
> > From: brd@jhu.edu <javascript:;>
> > Date: Mon, 10 Aug 2015 19:13:50 +0000
> > Subject: Re: Help required with my custom controller service
> > To: dev@nifi.apache.org <javascript:;>
> >
> > All,
> >
> > Was this ever solved / explained? I'm having a similar issue. If there's
> > a simple answer that I'm missing that would be great... otherwise I might
> > post an example set of NARs somewhere tomorrow. Probably the simplest
> > question first is, if I want to create a custom processor that uses a
> > SSLContextService, what dependencies do I need to add where (assuming
> we're
> > using the processor NAR archetype)? I've created an example that
> compiles,
> > loads in NiFi, and can be dropped on the graph. However, it can not be
> > configured to use any currently existing SSLContextService, and any that
> > are created have the same UUID issue described by David. Thoughts?
> >
> > Brandon
> >
> >
> >
> > On Tue, Jul 28, 2015 at 10:50 AM Mark Payne <markap14@hotmail.com
> <javascript:;>> wrote:
> >
> >> Dave,
> >>
> >> In addition to the points that Aldrin brought up, are your CacheService
> >> interface
> >> and StandardCacheService classes in the same NAR?
> >>
> >> If they are not in the same NAR, does your NAR for StandardCacheService
> >> have a Maven dependency
> >> on the NAR that houses CacheService?
> >>
> >> Thanks
> >> -Mark
> >>
> >> ----------------------------------------
> >>> From: aldrinpiri@gmail.com <javascript:;>
> >>> Date: Mon, 27 Jul 2015 23:26:58 -0400
> >>> Subject: Re: Help required with my custom controller service
> >>> To: dev@nifi.apache.org <javascript:;>; davidrsmith@btinternet.com
> <javascript:;>
> >>>
> >>> Dave,
> >>>
> >>> Some quick notes as I work through your setup.
> >>>
> >>> Did you create an entry in your
> >>> NAR's org.apache.nifi.controller.ControllerService file? This would be
> in
> >>> src/main/resources/META-INF/services directory of your project. It
> seems
> >>> like this isn't likely the case, but a point that can sometimes get
> >>> overlooked.
> >>>
> >>> Your accessing of the service property in your processor looks good.
> >>>
> >>> Did you accidentally override
> AbstractControllerService#getIdentifier()?
> >>> It seems like this could lead to the error you are seeing, but it is
> hard
> >>> to be sure.
> >>>
> >>> If you are able to share more code with us, we can provide some more
> >>> pointed assistance. Have you managed to get your processor and
> controller
> >>> service running within the test framework [1]? If not, I would suggest
> >>> doing so to cut down on iterations in debugging your problems as well
> as
> >>> providing a means for you to easily step through the code.
> >>>
> >>> [1]
> >> http://nifi.apache.org/docs/nifi-docs/html/developer-guide.html#testing
> >>>
> >>> On Sun, Jul 26, 2015 at 4:45 PM, DAVID SMITH <
> davidrsmith@btinternet.com <javascript:;>
> >>>
> >>> wrote:
> >>>
> >>>> Hi
> >>>> I have been trying to write a simple Cache Controller Service that
> uses
> >> a
> >>>> Map to hold <String, String> key/value pairs. I am using
> >>>> nifi-0.1.0-incubating. I have created an Interface called CacheService
> >>>> which extends ControllerService.public interface CacheService extends
> >>>> ControllerService {
> >>>>
> >>>> I have created an implementation called StandardCacheService which is
> as
> >>>> follows:
> >>>> public class StandardCacheService extends AbstractControllerService
> >>>> implements CacheService {
> >>>> I have compiled the StandardCacheService and created a nar which I
> have
> >>>> then put into my NiFi lib directory, my StandardCacheService
> Controller
> >>>> Service appears in the Controller services tab of the NiFi Flow
> Settings
> >>>> panel, I can edit it and enable it. Also there are no abnormal log
> >> messages.
> >>>> However, when I try to configure the CacheService in my test
> Processor,
> >>>> again I get no errors but when I cannot see my StandardCacheService.
> My
> >>>> processor has the following snippets to implement the Cache
> >>>> Service/Controller:
> >>>> public static final PropertyDescriptor CACHE_SERVICE = new
> >>>> PropertyDescriptor.Builder()
> >>>> .name("Cache Service")
> >>>> .description("The Controller Service to use in order to obtain a
> >>>> Cache Service")
> >>>> .required(false)
> >>>> .identifiesControllerService(CacheService.class)
> >>>> .build();
> >>>>
> >>>> final CacheService cache =
> >>>>
> >>
> context.getProperty(CACHE_SERVICE).asControllerService(CacheService.class);
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> When configuring the processor, the 'Cache Service' drop down doesn't
> >> show
> >>>> a populated list showing my StandardCacheService, but it does allow
me
> >> to
> >>>> create a new service, the resulting panel allows me to then select
> >>>> StandardCacheService. When I select 'create' I get a UUID value in the
> >>>> Value property of the Configure Processor panel. When I then apply
> this
> >>>> the processor shows a yellow triangle, when I hover over it I get the
> >>>> following message:
> >>>> 'Cache Service validated against <UUID> is invalid because Invalid
> >>>> Controller service <UUID> is not a valid Controller service Identifier
> >> or
> >>>> does not reference the correct type of Controller service.'
> >>>> Can you help please
> >>>> Many thanksDave
> >>>>
> >>>>
> >>
>



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