chengshiwen opened a new pull request #4759:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4759
## What is the purpose of the pull request
*Introduce executor and datasource service interface for clear code and
close pr #3440*
## Brief change log
- *Add DataSourceServiceImpl and change DataSourceService to interface*
- *Add ExecutorServiceImpl and change ExecutorService to interface*
## Verify this pull request
*(Please pick either of the following options)*
This pull request is already covered by existing tests, such as *(please
describe tests)*.
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