Ashraf, Are you looking for a step-by-step tutorial? The Developer Guide [1] does discuss Controller Services to some extent. You can also take a look at an example like SSLContextService and the Maven directory structure here [2].
[1] https://nifi.apache.org/docs/nifi-docs/html/developer-guide.html#controller-services <https://nifi.apache.org/docs/nifi-docs/html/developer-guide.html#controller-services> [2] https://github.com/apache/nifi/tree/master/nifi-nar-bundles/nifi-standard-services/nifi-ssl-context-bundle <https://github.com/apache/nifi/tree/master/nifi-nar-bundles/nifi-standard-services/nifi-ssl-context-bundle> Andy LoPresto [email protected] [email protected] PGP Fingerprint: 70EC B3E5 98A6 5A3F D3C4 BACE 3C6E F65B 2F7D EF69 > On Apr 21, 2016, at 12:47 PM, Ashraf Hasson <[email protected]> wrote: > > Hi Andy, > > Can you complement your list with guides or how-tos on building a custom > controller service and tie that into a processor that leverages the service. > The only blog I found on this was Phillip Grenier's article > (http://www.nifi.rocks/developing-a-custom-apache-nifi-controller-service/ > <http://www.nifi.rocks/developing-a-custom-apache-nifi-controller-service/>) > but it doesn't detail how the bundle directory structure and dependencies > were built with maven. > Developing a Custom Apache Nifi Controller Service - NiFi ... > <http://www.nifi.rocks/developing-a-custom-apache-nifi-controller-service/> > www.nifi.rocks <http://www.nifi.rocks/> > How to develop a custom Apache Nifi controller service. The example in this > post will utilize Java Properties files. > > Thanks, > > > From: Andy LoPresto <[email protected]> > Sent: April 20, 2016 6:59 PM > To: [email protected] > Subject: Re: Where can I find documentation of implementing custom processor? > > Hi Keith, > > I’ve moved this conversation to the dev list as that is where coding is more > frequently discussed as opposed to the users list. If you’re not already > subscribed, you can do so following the instructions here [1] to ensure you > see any replies. > > The best approach is probably to examine the standard processors in [2]. Here > you will be able to see how other developers have extended the > AbstractProcessor class with domain-specific implementations. One example is > EncryptContent [3] — you can see that while a lot of the encryption logic is > delegated to the various *Encryptor classes, the code includes > processor-specific tasks like configuring PropertyDescriptors (how users > enter properties for the processor) and validating those values, configuring > relationships like success and failure, and using the session and flowfile > with StreamCallbacks and reporting provenance events. > > For extensive documentation on writing a processor, the Developer Guide [4] > is the most comprehensive resource and describes the processor API, > documenting your processor, common patterns, and error handling & testing. If > you have specific questions during the development process, please feel free > to ask on the dev list. The community has a broad and deep knowledge and is > excited to help new developers with general NiFi development or very > domain-specific questions as well. > > [1] https://nifi.apache.org/mailing_lists.html > <https://nifi.apache.org/mailing_lists.html> > [2] > https://github.com/apache/nifi/tree/e4b7e47836edf47042973e604005058c28eed23b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard > > <https://github.com/apache/nifi/tree/e4b7e47836edf47042973e604005058c28eed23b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard> > [3] > https://github.com/apache/nifi/blob/e4b7e47836edf47042973e604005058c28eed23b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/EncryptContent.java > > <https://github.com/apache/nifi/blob/e4b7e47836edf47042973e604005058c28eed23b/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/EncryptContent.java> > [4] https://nifi.apache.org/docs/nifi-docs/html/developer-guide.html > <https://nifi.apache.org/docs/nifi-docs/html/developer-guide.html> > > > Andy LoPresto > [email protected] <mailto:[email protected]> > [email protected] <mailto:[email protected]> > PGP Fingerprint: 70EC B3E5 98A6 5A3F D3C4 BACE 3C6E F65B 2F7D EF69 > >> On Apr 20, 2016, at 3:42 PM, Keith Lim <[email protected] >> <mailto:[email protected]>> wrote: >> >> Is there any good example of implementing a custom Processor? >> >> Thanks, >> Keith
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