To decouple Sharding-Orchestration from Sharding-JDBC

[tristaZero]

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Please answer these questions before submitting your issue. Thanks!

Which version of Sharding-Sphere do you using?

3.0.0.M2

Which project do you using? Sharding-JDBC or Sharding-Proxy?

Sharding-JDBC

Analyze

We need to make sharding orchestration independent of sharding jdbc.

The tasks are as follows:

• Set the API for OrchestrationDataSource.

Instead of using extend mode, it is better to use decorator mode to rewrite OrchestrationDataSource.

• Move all source code of Orchestration and event code in Sharding-Core to Sharding-Orchestration.

• Handle the orchestration of SP and S-JDBC by the same way.

• Move refress, circutBreak, disabled functions from Sharding-JDBC to Sharding-JDBC-Orchestration.