@startuml
  participant SCH_DB as "scheduler DB" #B0C4DE
  participant SCH_RUN as "scheduler runner"
  participant SCH_LS as "scheduler listener"
  participant RMQ as "Rabbit-MQ"
  participant OBJSTORE as "object storage"
  participant STORAGE_DB as "storage DB" #B0C4DE
  participant STORAGE_API as "storage API"
  participant WORK_GIT as "worker@loader-git"
  participant GIT as "git server"

  Note over SCH_DB,SCH_RUN: Task T2 created beforehand \n by the lister-gitlab task
  loop Polling
      SCH_RUN->>SCH_DB: GET TASK set state=scheduled
      SCH_DB-->>SCH_RUN: TASK id=T2
	  activate SCH_RUN
      SCH_RUN->>RMQ: CREATE Celery Task CT2 loader-git
	  deactivate SCH_RUN
	  activate RMQ
  end

  RMQ->>WORK_GIT: Start task CT2
  deactivate RMQ
  activate WORK_GIT

  WORK_GIT->>STORAGE_API: GET origin state
  activate STORAGE_API
  STORAGE_API-->>WORK_GIT: 200
  deactivate STORAGE_API

  WORK_GIT->>GIT: GET refs
  activate GIT
  GIT->>WORK_GIT: 200 / refs
  deactivate GIT

  WORK_GIT->>GIT: GET new_objects
  activate GIT
  GIT->>WORK_GIT: 200 / objects
  deactivate GIT

  WORK_GIT->>GIT: PACKFILE
  activate GIT
  GIT->>WORK_GIT: 200 / blobs
  deactivate GIT

  WORK_GIT->>STORAGE_API: LOAD NEW CONTENT
  activate STORAGE_API
  loop For each blob
      STORAGE_API->>OBJSTORE: ADD BLOB
  end
  STORAGE_API-->>WORK_GIT: 200 / blobs
  deactivate STORAGE_API

  WORK_GIT->>STORAGE_API: NEW DIR
  activate STORAGE_API
  loop For each DIR
    STORAGE_API->>STORAGE_DB: INSERT DIR
  end
  STORAGE_API-->>WORK_GIT: 201
  deactivate STORAGE_API

  WORK_GIT->>STORAGE_API: NEW REV
  activate STORAGE_API
  loop For each REV
    STORAGE_API->>STORAGE_DB: INSERT REV
  end
  STORAGE_API-->>WORK_GIT: 201
  deactivate STORAGE_API

  WORK_GIT->>STORAGE_API: NEW REL
  activate STORAGE_API
  loop For each REL
    STORAGE_API->>STORAGE_DB: INSERT REL
  end
  STORAGE_API-->>WORK_GIT: 201
  deactivate STORAGE_API

  WORK_GIT->>STORAGE_API: NEW SNAPSHOT
  activate STORAGE_API
  loop For each SNAPSHOT
    STORAGE_API->>STORAGE_DB: INSERT SNAPSHOT
  end
  STORAGE_API-->>WORK_GIT: 201
  deactivate STORAGE_API

  WORK_GIT-->>RMQ: SET CT2 status=eventful
  deactivate WORK_GIT
  activate RMQ
  RMQ->>SCH_LS: NOTIFY end of task CT2
  deactivate RMQ
  activate SCH_LS
  SCH_LS->>SCH_DB: UPDATE T2 set state=end
  deactivate SCH_LS
@enduml