Re: get ControllerService inside Advanced custom UI

[尹文才]

Thanks Matt, how should I get the service identifier with the method
getComponentDetails, do you mean I should add a service identifier property
in my processor to let user to specify it for the controller service? In
that case how could the service identifier configured associate with the
configured controller service?

Regards,
Ben

2017-07-01 21:35 GMT+08:00 Matt Gilman :

> Ben,
>
> That is the correct method to invoke. The serviceIdentifier will be the
> value of the Property that identifies the service in question. The
> componentId will be the identifier of Processor. You'll need to invoke
>
> ComponentDetails getComponentDetails(NiFiWebRequestContext requestContext)
>
> in order to get the service identifier from the configured properties.
>
> Thanks
>
> Matt
>
> On Sat, Jul 1, 2017 at 4:17 AM, 尹文才  wrote:
>
> > Hi guys, I' m currently creating a custom UI for my processor and I need
> to
> > get the DBCP Connection ControllerService in the backend code for the UI,
> > the ControllerService is a property defined in the processor properties.
> I
> > saw there's one method in class NiFiWebConfigurationContext as below:
> >
> > ontrollerService getControllerService(String serviceIdentifier, String
> > componentId);
> >
> >
> > However this method requires the serviceIdentifier which I don't know
> >
> > how to obtain. How exactly should I get the ControllerService?
> >
> > Thanks.
> >
> >
> > Regards,
> >
> > Ben
> >
>

Re: Understanding Nifi

[Andy LoPresto]

Matan,

In general, to perform data transformations in NiFi, you will not write any 
code at all. NiFi provides draggable components which you wire together into a 
dataflow to perform ingest, enrichment, routing, transformation, and delivery 
activities. 

Some components do accept arbitrary code in order to perform their behavior -- 
examples include ScriptedLookupService, ExecuteScript, JoltTransformJSON, etc. 
In these cases, the component will describe what languages are acceptable. The 
script components accept JavaScript/Groovy/Python/Ruby/Lua. The Jolt processor 
uses the custom Jolt DSL. 

Other components in NiFi accept NiFi Expression Language in order to populate 
per-flowfile attributes and values. The EL is documented here [1]. 

[1] http://nifi.apache.org/docs/nifi-docs/html/expression-language-guide.html

Andy LoPresto
alopre...@apache.org
alopresto.apa...@gmail.com
PGP Fingerprint: 70EC B3E5 98A6 5A3F D3C4  BACE 3C6E F65B 2F7D EF69

> On Jul 1, 2017, at 09:09, Matan Safriel  wrote:
> 
> Hi,
> 
> What languages can I use to prescribe data transformations? does it confine
> to a certain language, or can I e.g. user Clojure and Python?
> Hopefully there's no Nifi-specific DSL/language that must be used.
> 
> Thanks!
> Matan

Understanding Nifi

[Matan Safriel]

Hi,

What languages can I use to prescribe data transformations? does it confine
to a certain language, or can I e.g. user Clojure and Python?
Hopefully there's no Nifi-specific DSL/language that must be used.

Thanks!
Matan

Re: get ControllerService inside Advanced custom UI

[Matt Gilman]

Ben,

That is the correct method to invoke. The serviceIdentifier will be the
value of the Property that identifies the service in question. The
componentId will be the identifier of Processor. You'll need to invoke

ComponentDetails getComponentDetails(NiFiWebRequestContext requestContext)

in order to get the service identifier from the configured properties.

Thanks

Matt

On Sat, Jul 1, 2017 at 4:17 AM, 尹文才  wrote:

> Hi guys, I' m currently creating a custom UI for my processor and I need to
> get the DBCP Connection ControllerService in the backend code for the UI,
> the ControllerService is a property defined in the processor properties. I
> saw there's one method in class NiFiWebConfigurationContext as below:
>
> ontrollerService getControllerService(String serviceIdentifier, String
> componentId);
>
>
> However this method requires the serviceIdentifier which I don't know
>
> how to obtain. How exactly should I get the ControllerService?
>
> Thanks.
>
>
> Regards,
>
> Ben
>

get ControllerService inside Advanced custom UI

[尹文才]

Hi guys, I' m currently creating a custom UI for my processor and I need to
get the DBCP Connection ControllerService in the backend code for the UI,
the ControllerService is a property defined in the processor properties. I
saw there's one method in class NiFiWebConfigurationContext as below:

ontrollerService getControllerService(String serviceIdentifier, String
componentId);


However this method requires the serviceIdentifier which I don't know

how to obtain. How exactly should I get the ControllerService?

Thanks.


Regards,

Ben