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Chat Application Data Flow Diagrams (DFD)

Level 0 (Context Diagram)

graph LR
    User((User)) -->|Login/Register| ChatSystem[Chat System]
    User -->|Send Message| ChatSystem
    User -->|Manage Profile| ChatSystem
    User -->|Friend Request| ChatSystem
    ChatSystem -->|Messages| User
    ChatSystem -->|Notifications| User
    ChatSystem -->|Friend Status| User
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Level 1 (Top Level)

graph TD
    User((User)) -->|Login/Register| Auth[Authentication]
    User -->|Send Message| MessageHandler[Message Handler]
    User -->|Update Profile| ProfileManager[Profile Manager]
    User -->|Friend Request| FriendManager[Friend Manager]
    
    Auth -->|Validate| Database[(Database)]
    MessageHandler -->|Store| Database
    ProfileManager -->|Update| Database
    FriendManager -->|Manage| Database
    
    Database -->|User Data| Auth
    Database -->|Messages| MessageHandler
    Database -->|Profile Data| ProfileManager
    Database -->|Friend Data| FriendManager
    
    MessageHandler -->|Deliver| User
    ProfileManager -->|Confirm| User
    FriendManager -->|Notify| User
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Level 2 (Detailed Level)

graph TD
    subgraph Authentication
        Login[Login] --> Validate[Validate Credentials]
        Register[Register] --> CreateUser[Create User]
        CreateUser --> StoreUser[Store User Data]
    end
    
    subgraph Message Handling
        Compose[Compose Message] --> ValidateMessage[Validate Message]
        ValidateMessage --> StoreMessage[Store Message]
        StoreMessage --> NotifyRecipient[Notify Recipient]
        NotifyRecipient --> UpdateStatus[Update Message Status]
    end
    
    subgraph Profile Management
        EditProfile[Edit Profile] --> ValidateProfile[Validate Profile]
        ValidateProfile --> UpdateProfile[Update Profile]
        UpdateProfile --> StoreProfile[Store Profile]
    end
    
    subgraph Friend Management
        SendRequest[Send Friend Request] --> ValidateRequest[Validate Request]
        ValidateRequest --> StoreRequest[Store Request]
        StoreRequest --> NotifyUser[Notify User]
        AcceptRequest[Accept Request] --> UpdateFriendship[Update Friendship]
        UpdateFriendship --> StoreFriendship[Store Friendship]
    end
    
    subgraph Database
        UserDB[(User DB)]
        MessageDB[(Message DB)]
        ProfileDB[(Profile DB)]
        FriendDB[(Friend DB)]
    end
    
    StoreUser --> UserDB
    StoreMessage --> MessageDB
    StoreProfile --> ProfileDB
    StoreRequest --> FriendDB
    StoreFriendship --> FriendDB
    
    UserDB --> Validate
    MessageDB --> NotifyRecipient
    ProfileDB --> ValidateProfile
    FriendDB --> ValidateRequest
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Process Descriptions

Authentication Processes

  1. Login

    • Input: Username/Email and Password
    • Process: Validate credentials against database
    • Output: Authentication token or error message

  2. Register

    • Input: User details (username, email, password)
    • Process: Create new user account
    • Output: Success message or validation errors

Message Handling Processes

  1. Compose Message

    • Input: Message content and recipient
    • Process: Validate and format message
    • Output: Prepared message for sending

  2. Message Delivery

    • Input: Prepared message
    • Process: Store and deliver to recipient
    • Output: Delivery confirmation

Profile Management Processes

  1. Edit Profile
    • Input: Updated profile information
    • Process: Validate and update profile
    • Output: Updated profile confirmation

Friend Management Processes

  1. Friend Request

    • Input: Friend request details
    • Process: Validate and store request
    • Output: Request notification

  2. Accept Request

    • Input: Request acceptance
    • Process: Update friendship status
    • Output: Friendship confirmation

Data Stores

  1. User Database

    • Stores user credentials and basic information
    • Maintains user authentication data

  2. Message Database

    • Stores all messages and their status
    • Maintains message history

  3. Profile Database

    • Stores user profile information
    • Maintains profile updates

  4. Friend Database

    • Stores friendship relationships
    • Maintains friend request status

External Entities

  1. User
    • Initiates all processes
    • Receives notifications and updates
    • Manages their profile and connections