Carbon registry usage removal from the XACML

[darshanasbg]

Is your feature request related to a problem? Please describe. The XACML feature of the Identity Server currently uses the Registry as its storage repository, which is a roadblock to the plan to remove the Registry from the Identity Server.

This is part of the larger effort to remove the Registry from the Identity Server, which will help lower operational and product maintenance costs.

Describe the solution you would prefer Need to find an alternative solution for managing XACML policies that doesn’t depend on the Registry.

This issue will track the progress of the registry usage removal from the XACML feature.

Additional context Registry removal parent issue: Remove carbon registry usages in IS

[Niru-D]

Milestones

Milestone 01:

• [x] Create the new table structure.

  • Design doc - https://docs.google.com/document/d/1RCBj2VWnnMBGsXJFDW01ZJx8IhV_rIwahVzNneRIPJ0/edit?usp=sharing

Milestone 02:

• [x] Restructure the source code and create a new DAO layer to access the data.

  • Remove the pluggability of the policy version manager and the policy data store. https://github.com/wso2/carbon-identity-framework/pull/5681

  • Restructure the code and separate the registry accessing layer into a DAO layer implementing interfaces. https://github.com/wso2/carbon-identity-framework/pull/5686

    • Code review - https://drive.google.com/file/d/1s1Jd0woWeFv-sUQb2YeTN2tZ9C8iT88_/view

• [x] Implement the RDBMS extension to the DAO layer.

  • Refactor registry implementation to align with DB impl https://github.com/wso2/carbon-identity-framework/pull/5787 https://github.com/wso2/carbon-identity-framework/pull/5812 https://github.com/wso2/carbon-identity-framework/pull/5817

  • Introduce JDBC implementation https://github.com/wso2/carbon-identity-framework/pull/5826 https://github.com/wso2/carbon-identity-framework/pull/5835 https://github.com/wso2/carbon-identity-framework/pull/5865

    • Code review - https://drive.google.com/file/d/1nF701UXbZ-LEYSe4NnP43vZQJDFGqenc/view

  • Add DB schemas https://github.com/wso2/carbon-identity-framework/pull/5860 https://github.com/wso2/carbon-identity-framework/pull/5863

• [x] Implement an on-demand migration solution.

  • Hybrid solution is also be covered by: https://github.com/wso2/carbon-identity-framework/pull/5826 https://github.com/wso2/carbon-identity-framework/pull/5835 https://github.com/wso2/carbon-identity-framework/pull/5872

Milestone 03:

• [x] Add caching to new DAOs.

  • Refactor code to facilitate caching implementation. https://github.com/wso2/carbon-identity-framework/pull/5840 https://github.com/wso2/carbon-identity-framework/pull/5842

  • Introduce caching. https://github.com/wso2/carbon-identity-framework/pull/5844

Milestone 04:

• [x] Introduce residual migrator.

  • Residual migrator implementation for migrating residual data from registry to database. https://github.com/wso2-enterprise/identity-migration-resources/pull/475