sandynz opened a new pull request #14640:
URL: https://github.com/apache/shardingsphere/pull/14640


   Purpose:
   - Simplify singleton SPI loading
   - Simplify singleton SPI registration. `SingletonSPIRegistry` will register 
SPI class automatically, there is not side effect for singleton spi.
   
   Changes proposed in this pull request:
   - Add `SingletonSPI` and `SingletonSPIRegistry`
   - Refactor `ShardingSphereServiceLoader.getSingletonServiceInstances` to 
`SingletonSPIRegistry` invocation
   - Refactor part of `TypedSPIRegistry.getRegisteredService` to 
`SingletonSPIRegistry` invocation for pipeline modules
   - `RequiredSPIRegistry.getRegisteredService` support `SingletonSPI`. Just 
integrate with pipeline modules for now.
   


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