Spring Boot API with Angular and RxJs State Management

Define a Spring Boot web app domain for a server entity with id, IP address, name, memory, type, image URL, and status, using JPA, Lombok, and validation.

Create a server repository that extends the JPA repository to manage server data and enable save, delete, list operations, including find by IP address and ensure IP addresses are unique.

Define and implement a server service interface with create, list, get, update, delete, and ping operations backed by a JPA repository and a concrete implementation that updates the ui status.

Implements a Spring Boot service that wires the server repository via Lombok, logs actions, saves servers with images, and pings servers by IP to update status.

Implement server management with paging, fetching by id, updating, and deleting servers using a repository and JPA, converting pages to lists, and handling limits.

Implement random server image assignment by defining an image names array of server images, selecting a random index with nextInt(4), and constructing the URL for the selected server image.

Create a reusable Spring Boot response model with timestamp, status, reason, message, developer message, and data, and use it in a controller for consistent API replies.

Create a server resource rest controller with a get mapping to /servers/list, inject the server service, and return a response entity containing servers data and ok status.

Implement ping and save endpoints for server resources, capturing ip address via a path variable and validating the request body, returning statuses like ping success, server up, and server created.

Build a Spring Boot API to manage servers by id, including get, delete, and image retrieval endpoints, with seed data via command line runner.

Learn how to test your Spring Boot API endpoints with Postman, including listing servers, retrieving by ID, saving new servers, testing image URLs, and pinging hosts.

Set up the Angular front end with the Angular CLI, create a single-page app, and explore a reactive approach using the ARGS library to map server statuses.

Create a server interface and a data state enum to model loading, loaded, and error states, and define a custom response interface to map backend data to the frontend.

Represent the entire application state with a generic app state interface, including a data state (loading, loaded, error) and optional data or error values, enabling a reactive state management approach.

Create a reactive Angular server service that uses HttpClient to fetch the server list from the backend, map responses to the app state, and handle errors with tap and catchError.

Implement post save for servers by sending the server as the request body, including an IP address in the ping flow, and handle errors with a typed http error response.

Filter servers by status using an observable in a server service, override response messages for up or down states, and return filtered data to the UI with RxJS techniques.