RFC: Parameter Injection #184
Description
Key information
- RFC PR:
- Related issue(s), if known:
- Area: Parameter
- Meet tenets: Yes
Summary
Provide an annotation based injection of parameters. A concept similar to the @value annotation in Spring, backed up by the existing providers for SSM and Secrets Manager
Motivation
This feature will make it easier and concise to retrieve and use parameters in a declarative way.
Proposal
Annotating a String field into the Lambda handler would result into the field to be populated with the value of the referenced parameter available in one of the possible providers (SSM and Secrets Manager for the time being).
It could look like this:
@Parameter(name="/powertools-java/sample/simplekey")
private String myParam;
The annotation can provide options to specify name, provider, transformation, caching
@Parameter(name="/sample/simplekey", provider="SSM", maxAge=30)
private String myParam;
Drawbacks
Why should we not do this?
Less transparency in the code
Do we need additional dependencies? Impact performance/package size?
No
Rationale and alternatives
- What other designs have been considered? Why not them?
- What is the impact of not doing this?
Unresolved questions
Optional, stash area for topics that need further development e.g. TBD