Provide a way to use a custom ResourceProvider

Hey folks,

In Quarkus we have a Flyway extension that is configured with the locations to the migration scripts at build time. The locations cannot be changed at runtime, meaning that the locations are always known to us at build time thus, making runtime classpath scanning for them redundant (at best).

I looked at the code in order to see if we could configure Flyway to use a custom ResourceProvider (which Quarkus would setup with the proper locations), but short of sub-classing Flyway and overriding execute, I didn’t see any way of doing so.

It would be great for us if such a configuration point were possible. WDYT? If you like the idea, I can provide a PR using whatever design you think it best.

Thanks!

[geoand]

That’s what I had in mind as well

[KPhi]

We’re trying to get a ResourceProvider running in an OSGi environment. However, we are encountering issues with implementing the interface, as the class org.flywaydb.core.internal.resource.LoadableResource referenced in the public signature is not exported via the library’s MANIFEST.MF file.

Access restriction: The type 'LoadableResource' is not API (restriction on required library 'org.flywaydb.core_6.5.1.jar')

In theory, we could implement the interface in the org.flywaydb.core, put it into a dedicated bundle and attach it as a fragment to the library. Then we would need to have the ability to reference the class as a string, which is possible for the FluentConfiguration.resolvers() method but not implemented for FluentConfiguration.resourceProvider(). This solution has other issues, however (think loading resources from different bundles), and is no real alternative anyway. Does someone have an example on how we can get this to work in OSGi?