yangyichao-mango opened a new pull request #3438:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/3438
## What is the purpose of the pull request
*Introduce access token service interface for clear code*
## Brief change log
- *Change AccessTokenService class to interface*
- *Introduce AccessTokenServiceImpl class for AccessTokenService interface*
- *Format the code style*
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