Rastislav Misecka created NIFI-9296:
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Summary: Improve the code structure of the InvokeHTTP processor
Key: NIFI-9296
URL: https://issues.apache.org/jira/browse/NIFI-9296
Project: Apache NiFi
Issue Type: Improvement
Reporter: Rastislav Misecka
InvokeHTTP is a very useful processor as it is, but there are many scenarios,
where a modified/extended version of its basic functionality is a much better
match to the problem at hand. Especially when creating complex flows to achieve
such extensions is not an option.
The final keyword was removed from the implementing class some time ago, but
because of the way how its code is structured, with many private methods and
rather "monolithic" structure of its onTrigger method, this alone is not
sufficient to allow for easy extensibility via derivation.
The only way how such extensions can be realized at present is to copy huge
parts of the original code and tweak it in a specialized instance of a new
processor. Which can lead to a whole set of new problems, such as copied code
not matching the code style and/or quality requirements (cyclomatic complexity
being one typical example) of the "host" code base.
Restructuring parts of the code would go a long way in enabling such scenarios
in a much easier and cleaner way. This would include making several key methods
protected instead of private and also splitting the bigger methods into
logically more coherent and also more manageable (and overridable) chunks.
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