* Fixed this bug "multiple threads creating folders will result in multiple identical folders" #3487

* 1. Improvement `DataSourceServiceTest` #3558
2. Get rid of some useless arguments to functions in the `DataSourceService` class

* The rollback `ResourceService.java`

* The rollback `ResourceService.java`

* The rollback `ResourceService.java`

* 1.Modify code styles.
2.Make improvement according to Yichao Yang's advice. Thank you very much for guidance.@Yichao Yang

* Modify code styles.

* Circumventing the checkConnection problem

* Modify code styles.