[GitHub] nicolaferraro opened a new issue #115: Introducing Traits

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nicolaferraro opened a new issue #115: Introducing Traits
URL: https://github.com/apache/camel-k/issues/115
 
 
   What is a trait?
   It's a high level "feature" of Camel K, but if I say "feature" you think to a completely different thing in the Camel/Karaf world, so let's call it "trait" for now.
   
   Some examples of traits I've in mind:
   - "dependencies": when activated, if you run a integration that uses a known component URI, the component is added to the classpath (already implemented, but it wasn't called a trait)
   - "expose": when activated, Camel K adds a service and a ingress to the deployment
   - "rest": when activated, Camel K adds and configure a rest environment (e.g. with netty-http or undertow) to expose rest endpoint
   - "openapi": adds openapi 2.0 libraries (Swagger) and configure them (this seems a Karaf feature). It also adds information on the apis on the deployment so that the apis can be discovered
   - "cron": converts a long-running timer into a Kubernetes cronJob, enabling the necessary configuration on the runtime
   - "knative-idler": binds the deployed integrations to knative, so that they can be scaled to 0 to save resources
   - "graal": compiles the integration with graal
   
   So traits are **complex features** that a user can **enable/disable**, or in some cases also **configure**. They're like "enrichers"/"generators" in the fabric8 maven plugin (for those who know it). But differently from f-m-p, we should document them.
   
   When a trait is not enabled/disabled by the user, Camel K tries to **determine the best configuration** of each trait for the application. E.g. the "rest" trait can be enabled automatically when I'm using rest in my integration, the "cron" trait can be enabled if I have a single route that starts with timer (and a configured long delay) and it needs to have a specific configuration so that the engine can trigger the integration correctly.
   
   Let's discuss about this.
   
   What do you think @lburgazzoli, @dmvolod, @oscerd, @valdar, @onderson?
   Is it a good abstraction over the features we've talked about in the dev mailing list?
   
   

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