# Application Flow

Below you will find a sequence diagram detailing the application flow of Notebooks Hub.

```{mermaid}
sequenceDiagram
    participant UI
    participant API
    participant Jupyterhub
    participant Labshare_Auth
    UI->>Labshare_Auth: Authenticate Me
    Labshare_Auth-->>UI: Authenticated
    Jupyterhub->>Labshare_Auth: Authenticate Me
    Jupyterhub -->> API: Retrieve Server Data from Jupyterhub API
    API -->> UI: Retrieve Template Data and cross reference Server Data <br> with available Server Titles in the Template Data to populate the Dashboard
    Labshare_Auth-->>Jupyterhub: Authenticated
    UI->>API: Click Create New on Dashboard Page
    API-->>UI: Return Template Data and populate Wizard
    Jupyterhub -->> API: Retrieve Module list from Jupyterhub PV
    API -->> UI: Display Module List in Wizard
    Note right of Jupyterhub: Internally Rolled <br/>Oauth
    UI->>API: Spawn Jupyter Server from Template
    API-->>UI: Server Stream to wait for full Server Creation
    UI->>Jupyterhub: Create and Open Jupyterhub URL from Template and User/Server Data
```