Added factory for config-backed Atum-Agent

[ABLL526]

Task:

Adds a factory method to create an AtumAgent instance backed by an explicitly provided Typesafe Config, enabling multiple agents with different dispatcher setups within the same JVM.

Context:

• https://github.com/absa-group/ursa-unify-deployment/pull/400
• https://github.com/absa-group/AUL/pull/4930

The above PRs updates the deployment pipeline to extract, package, and publish the external TypeSafe config for the data-measurement Spark plugin and ensure it is shipped to Spark via --files:

This supports the “external first, classpath fallback” strategy within AUL: the plugin first attempts to load application.conf distributed through Spark --files, and falls back to the classpath config if no external file is available.

Essentially, we want to externalize all configuration files. So, it is easier for the Ops teams and Dev teams to make changes to the configuration files without a need to always release a new version of Atum-Services or Unify. But since Atum-Services is in the codebase of Unify, a small change is needed on Atum-Services to be able to externalize these config files.

Closes:

#438

Release Notes:

• Added factory for config-backed agent
  • Added function fromConfig to AtumAgent
  • Added Unit Tests
  • Updated README to include Option 3

[github-actions]

Report: Report: server - scala:2.13.13

Metric (instruction)	Coverage	Threshold	Status
Overall	78.06%	71.0%	✅
Changed Files	0.0%	80.0%	✅

File Path	Coverage	Threshold	Status

No changed file in reports.

[Copilot]

Pull request overview

Adds a factory method to create an AtumAgent instance backed by an explicitly provided Typesafe Config, enabling multiple agents with different dispatcher setups within the same JVM.

Changes:

• Added AtumAgent.fromConfig(config: Config) to build a dedicated agent using dispatcherFromConfig(config).
• Added a unit test validating fromConfig constructs an agent with the expected dispatcher.
• Updated agent/README.md with a new “Option 3” showing how to create a config-backed agent.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
agent/src/main/scala/za/co/absa/atum/agent/AtumAgent.scala	Adds fromConfig factory for creating a config-backed agent instance.
agent/src/test/scala/za/co/absa/atum/agent/AtumAgentUnitTests.scala	Adds unit test coverage for the new fromConfig factory.
agent/README.md	Documents the new config-backed agent creation option.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

[lsulak]

I like this, thank you for your contribution!!

One thing, since you fundamentally changed this: before we had only 1 singleton Atum Agent, now a user can create his own instance. This is not covered with tests, so there is no verification that the returned agent is independent (own context store, own currentUser resolution). Worth adding at least a test showing two agents with different configs coexist.

[ABLL526]

I like this, thank you for your contribution!!

One thing, since you fundamentally changed this: before we had only 1 singleton Atum Agent, now a user can create his own instance. This is not covered with tests, so there is no verification that the returned agent is independent (own context store, own currentUser resolution). Worth adding at least a test showing two agents with different configs coexist.

Thank you, I have amended the test to ensure this was covered as well.

[lsulak]

Approving, thanks! With your prior permissions (on a chat), I'm gonna merge this now.