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] [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]> wrote: > > Is there any good example of implementing a custom Processor? > > Thanks, > Keith
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