Aldrin Piri created NIFI-1380:
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Summary: Provide Expression Language scoping for properties
Key: NIFI-1380
URL: https://issues.apache.org/jira/browse/NIFI-1380
Project: Apache NiFi
Issue Type: Improvement
Components: Core Framework
Reporter: Aldrin Piri
Priority: Minor
Expression Language when applied to a property via a PropertyDescriptor can
have different contexts in how it is applied. In one case, this can make use
of just System Environment variables or JVM properties. However, if applied
using the evaluateAttributeExpressions(FlowFile) method, this is done on a per
FlowFile basis.
Ideally we could provide some way for extension developers to communicate the
intent of how these properties will be used.
Perhaps adjusting PropertyDescriptor's builder method
#expressionLanguageSupported(boolean) to #expressionLanguageSupported(boolean,
ELScope) or similar would provide sufficient control. The auto generated
documentation could use this to provide the associated indication of EL level.
We could additionally have the test framework make use of this Scope to ensure
that if something is/is not scoped to use FlowFile level EL that these are
caught in testing.
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