[jira] [Created] (OAK-7425) Add discovery mechanism for tooling implementations

["Francesco Mari (JIRA)" <ji...@apache.org>]

Francesco Mari created OAK-7425:
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             Summary: Add discovery mechanism for tooling implementations
                 Key: OAK-7425
                 URL: https://issues.apache.org/jira/browse/OAK-7425
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: segment-tar
            Reporter: Francesco Mari
            Assignee: Francesco Mari
             Fix For: 1.10
         Attachments: 001.patch

This issue proposes an idea for discovering implementations of tooling for the Segment Store. Developing a tool for the Segment Store should include the following step.

* The tool compiles against the {{NodeStore}} API and the API exposed through the oak-segment-tar-tool-api. In particular, the tool uses the {{ToolingSupportFactory}} and related interfaces to instantiate a NodeStore and, optionally, a {{NodeState}} for the proc tree.
* The tool runs with an implementation-dependent uber-jar in the classpath. The uber-jar includes the {{ToolingSupportFactory}} API, its implementation, and every other class required for the implementation to work. No other JARs is required to use the {{ToolingSupportFactory}} API. The tool uses the Java's {{ServiceLoader}} to instantiate an implementation of {{ToolingSupportFactory}}. The uber-jar is the {{oak-segment-tar-tool}} module.

The patch falls short of fully implementing the use case because {{oak-segment-tar-tool-api}} is not versioned independently from Oak. This can't happen at the moment because {{oak-store-spi}} and its dependencies are not independently versioned either. The workflow described above could still work, but only because the {{NodeStore}} and {{NodeState}} API are quite stable. A cleaner solution to dependency management is required in the long run.





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