chengshiwen opened a new pull request #4766:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4766
## What is the purpose of the pull request
*Introduce resources, scheduler and taskinstance interface for clear code
and close pr #3444 which has conflicts and not updated for a long time*
## Brief change log
- *Add ResourcesServiceImpl and change ResourcesService to interface*
- *Add SchedulerServiceImpl and change SchedulerService to interface*
- *Add TaskInstanceServiceImpl and change TaskInstanceService 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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