yangyichao-mango opened a new pull request #3440:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/3440
## What is the purpose of the pull request
*Introduce executor and datasource service interface for clear code*
## Brief change log
- *Change `DatasourceService` class to interface*
- *Change `ExecutorService` class to interface*
- *Add `DatasourceServiceImpl` class for DatasourceService`*
- *Add `ExecutorServiceImpl` class for ExecutorService*
- *Format code style*
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