# zakariaimtiaz/weatherapp architecture

> Architecture diagram of the GitHub repository zakariaimtiaz/weatherapp, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-06-30). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/zakariaimtiaz/weatherapp
- Repository: https://github.com/zakariaimtiaz/weatherapp

## Overview

1. **Overall shape**
   - This is a **Java 17 / Jakarta EE 10 / Vaadin 24** application packaged and run as a traditional server-side web app.
   - The UI is primarily **server-rendered Vaadin Flow views** in Java, with a small amount of custom frontend JavaScript/CSS for presentation.

2. **Request and UI boundary**
   - Browser traffic enters through Vaadin’s app shell and main view layer, not through a separate SPA backend.
   - The main navigation appears to be centered around `MainView`, with `AppShell` defining global app-level bootstrap behavior.

3. **Presentation layer**
   - The server-side screens live under `src/main/java/.../view`:
     - `LoginView` handles authentication entry.
     - `FavoriteLocationsView` exposes saved locations and weather-related interactions.
   - The `frontend/` folder contains a custom `chart-component.js`, an `index.html`, and a theme under `frontend/themes/my-theme`, so the app likely uses a small client-side visualization component plus themed styling.

4. **Application services**
   - Business logic is split into a classic service layer:
     - `UserService` handles user-related operations.
     - `LocationService` handles location search, filtering, and weather-related flows.
   - These services form the main orchestration boundary between the UI and persistence/external API layers.

5. **Persistence model**
   - The domain is centered on two entities in `model`:
     - `Users`
     - `Location`
   - These are persisted and queried through repository classes, which keeps database access separate from UI and service logic.

6. **Repository/data access layer**
   - `UserRepository` and `LocationRepository` are the data access boundary to PostgreSQL.
   - `DatabaseManager` is the configuration point for database connection setup, suggesting the app relies on explicit runtime DB configuration rather than embedded storage.

7. **External integration**
   - `WeatherApiClient` is the integration point to an external weather data provider.
   - The likely flow is: user selects a city/location → service resolves the location and user context → API client fetches forecast data → results are rendered in the Vaadin view, possibly with the custom chart component for hourly/details visualization.

8. **Business flows visible from the repo**
   - Anonymous users can search locations by city name and apply filters.
   - Authenticated users can access forecast details by selecting a location.
   - Registered users can also view hourly weather details, implying an authorization boundary around deeper forecast functionality.

9. **Configuration and runtime**
   - The app is configured for deployment on **TomEE** or **WildFly**, with Maven plugins used for local execution and integration testing.
   - `web.xml`, `beans.xml`, and server-specific descriptors (`glassfish-web.xml`, `jboss-web.xml`) indicate a Jakarta EE deployment model with container-managed behavior.

10. **Database initialization**
   - `src/main/resources/script.sql` provides schema/data setup, and the README documents PostgreSQL 42.2.23.
   - The repository includes sample users, so login/authentication is backed by persisted credentials rather than an external identity provider.

11. **Testing and operational boundary**
   - `AbstractViewTest` and `MainViewIT` show that tests focus on UI/integration behavior, likely running against the configured application server.
   - WildFly is used for integration testing, which matters because the app depends on container behavior and Java 17 support.

12. **How to draw the architecture**
   - A useful diagram would show:
     - **Browser / Vaadin UI**
     - **Server-side views**
     - **Services**
     - **Repositories**
     - **PostgreSQL**
     - **External Weather API**
   - The key architectural boundary is that most UI state and navigation live on the server, while weather data is fetched externally and persisted user/location data lives in PostgreSQL.

Main entry points: [`src/main/java/org/vaadin/example/MainView.java`](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/MainView.java) (Main View), [`src/main/java/org/vaadin/example/view/FavoriteLocationsView.java`](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/view/FavoriteLocationsView.java) (Favorites), [`src/main/java/org/vaadin/example/service/LocationService.java`](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/service/LocationService.java) (Location Service), [`src/main/java/org/vaadin/example/repository/UserRepository.java`](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/repository/UserRepository.java) (User Repo)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_client["Client/UI"]
  node_appshell["App Shell<br/>vaadin shell<br/>[AppShell.java]"]
  node_mainview["Main View<br/>vaadin nav<br/>[MainView.java]"]
  node_loginview["Login<br/>vaadin view<br/>[LoginView.java]"]
  node_favoritesview["Favorites<br/>vaadin view"]
  node_chart["Chart UI<br/>frontend component<br/>[chart-component.js]"]
  node_theme["Theme<br/>[styles.css]"]
end

subgraph group_domain["Domain"]
  node_userservice["User Service<br/>[UserService.java]"]
  node_locationservice["Location Service"]
  node_userrepo["User Repo"]
  node_locationrepo["Location Repo"]
  node_users["Users<br/>entity<br/>[Users.java]"]
  node_location["Location<br/>entity<br/>[Location.java]"]
end

subgraph group_integration["Integration"]
  node_weatherapi["Weather API<br/>external client"]
  node_dbmanager["DB Manager<br/>db config"]
  node_tools["Tools<br/>[Tools.java]"]
  node_script["Schema Script<br/>sql init<br/>[script.sql]"]
  node_tests["Integration Tests<br/>test suite<br/>[MainViewIT.java]"]
end

node_appshell -->|"boots"| node_mainview
node_mainview -->|"routes to"| node_loginview
node_mainview -->|"navigates"| node_favoritesview
node_loginview -->|"auth via"| node_userservice
node_favoritesview -->|"uses"| node_locationservice
node_userservice -->|"reads/writes"| node_userrepo
node_locationservice -->|"reads/writes"| node_locationrepo
node_userrepo -->|"maps"| node_users
node_locationrepo -->|"maps"| node_location
node_locationservice -->|"fetches"| node_weatherapi
node_userrepo -->|"connects"| node_dbmanager
node_locationrepo -->|"connects"| node_dbmanager
node_weatherapi -.->|"formats"| node_tools
node_favoritesview -->|"renders"| node_chart
node_mainview -->|"styles with"| node_theme
node_dbmanager -.->|"initialized by"| node_script
node_tests -.->|"verifies"| node_mainview
node_tests -.->|"verifies"| node_favoritesview

click node_appshell "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/AppShell.java"
click node_mainview "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/MainView.java"
click node_loginview "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/view/LoginView.java"
click node_favoritesview "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/view/FavoriteLocationsView.java"
click node_userservice "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/service/UserService.java"
click node_locationservice "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/service/LocationService.java"
click node_userrepo "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/repository/UserRepository.java"
click node_locationrepo "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/repository/LocationRepository.java"
click node_users "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/model/Users.java"
click node_location "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/model/Location.java"
click node_weatherapi "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/api/WeatherApiClient.java"
click node_dbmanager "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/config/DatabaseManager.java"
click node_tools "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/util/Tools.java"
click node_chart "https://github.com/zakariaimtiaz/weatherapp/blob/main/frontend/chart-component.js"
click node_theme "https://github.com/zakariaimtiaz/weatherapp/blob/main/frontend/themes/my-theme/styles.css"
click node_script "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/resources/script.sql"
click node_tests "https://github.com/zakariaimtiaz/weatherapp/blob/main/src/test/java/org/vaadin/example/MainViewIT.java"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_appshell,node_mainview,node_loginview,node_favoritesview,node_chart,node_theme toneBlue
class node_userservice,node_locationservice,node_userrepo,node_locationrepo,node_users,node_location toneAmber
class node_weatherapi,node_dbmanager,node_tools,node_script,node_tests toneMint
```

## Components

### Client/UI

Browser-facing Vaadin shell and views

- [App Shell](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/AppShell.java): vaadin shell · Bootstraps the Vaadin application and global shell behavior · `src/main/java/org/vaadin/example/AppShell.java`
- [Main View](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/MainView.java): vaadin nav · Primary server-side navigation and app entry view · `src/main/java/org/vaadin/example/MainView.java`
- [Login](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/view/LoginView.java): vaadin view · Authentication entry screen · `src/main/java/org/vaadin/example/view/LoginView.java`
- [Favorites](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/view/FavoriteLocationsView.java): vaadin view · Saved locations and weather interactions · `src/main/java/org/vaadin/example/view/FavoriteLocationsView.java`
- [Chart UI](https://github.com/zakariaimtiaz/weatherapp/blob/main/frontend/chart-component.js): frontend component · Custom client-side visualization component · `frontend/chart-component.js`
- [Theme](https://github.com/zakariaimtiaz/weatherapp/blob/main/frontend/themes/my-theme/styles.css): frontend theme · Application styling and theme resources · `frontend/themes/my-theme/styles.css`

### Domain

Core application services, entities, and data access

- [User Service](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/service/UserService.java): service · User-related business operations and authorization support · `src/main/java/org/vaadin/example/service/UserService.java`
- [Location Service](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/service/LocationService.java): service · Location search, filtering, and weather coordination · `src/main/java/org/vaadin/example/service/LocationService.java`
- [User Repo](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/repository/UserRepository.java): repository · Persistence access for users · `src/main/java/org/vaadin/example/repository/UserRepository.java`
- [Location Repo](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/repository/LocationRepository.java): repository · Persistence access for locations · `src/main/java/org/vaadin/example/repository/LocationRepository.java`
- [Users](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/model/Users.java): entity · Persisted user credentials and profile data · `src/main/java/org/vaadin/example/model/Users.java`
- [Location](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/model/Location.java): entity · Persisted location and saved weather-related data · `src/main/java/org/vaadin/example/model/Location.java`

### Integration

External API and runtime configuration

- [Weather API](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/api/WeatherApiClient.java): external client · Client for external weather data provider · `src/main/java/org/vaadin/example/api/WeatherApiClient.java`
- [DB Manager](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/config/DatabaseManager.java): db config · Database connection and runtime configuration · `src/main/java/org/vaadin/example/config/DatabaseManager.java`
- [Tools](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/java/org/vaadin/example/util/Tools.java): utility · Shared helper functions · `src/main/java/org/vaadin/example/util/Tools.java`
- [Schema Script](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/main/resources/script.sql): sql init · Database schema and seed data · `src/main/resources/script.sql`
- [Integration Tests](https://github.com/zakariaimtiaz/weatherapp/blob/main/src/test/java/org/vaadin/example/MainViewIT.java): test suite · UI and application server integration coverage · `src/test/java/org/vaadin/example/MainViewIT.java`

## Connections

- App Shell → Main View: boots · Defines shell-level startup around the main UI
- Main View → Login: routes to · Exposes authentication entry flow
- Main View → Favorites: navigates · Routes users to the saved locations screen
- Login → User Service: auth via · Delegates login and user lookup to service layer
- Favorites → Location Service: uses · Loads locations and forecast interactions through service layer
- User Service → User Repo: reads/writes · Coordinates persisted user operations
- Location Service → Location Repo: reads/writes · Coordinates persisted location operations
- User Repo → Users: maps · Repository manages user entity persistence
- Location Repo → Location: maps · Repository manages location entity persistence
- Location Service → Weather API: fetches · Retrieves forecast and weather details externally
- User Repo → DB Manager: connects · Uses configured database access
- Location Repo → DB Manager: connects · Uses configured database access
- Weather API → Tools: formats · Shares helper logic for request or response handling
- Favorites → Chart UI: renders · Uses custom visualization for weather details
- Main View → Theme: styles with · Applies application theme resources
- DB Manager → Schema Script: initialized by · Database setup is backed by SQL seed/schema script
- Integration Tests → Main View: verifies · Integration tests exercise the main UI flow
- Integration Tests → Favorites: verifies · Covers authenticated weather/location behavior