Code reloading
Code reloading is a development technique that detects changed code or resources and refreshes, reevaluates, or restarts affected application components without requiring a full manual restart.
Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and Terraform
A development technique that detects source-code changes and automatically restarts or reloads a running application.
- How it is used
- Shortens development feedback by restarting changed microservices automatically instead of requiring manual restarts or repeated application rebuilds.
- How deep it goes
- Works through nodemon installation, npm scripts, container code sharing, a reload check, and a file-watching workaround.
- Examples
- Uses a startup-message edit in a Compose application and Jest commands that rerun tests after code changes.
- What you can do after
- Operate/configure it with nodemon and Docker Compose so edited microservices restart, and use Jest watch mode for test feedback.
Quarkus in Action
A development-time process that applies code or configuration changes by reloading an application without a full manual restart.
- How it is used
- Shortens the Quarkus development edit–check loop by applying saved changes when the running application receives a request.
- How deep it goes
- Explains triggers, request handling, state loss, and optional instrumentation, but defers class-loader architecture details.
- Examples
- Uses a changed REST greeting, a missing semicolon, and Dev mode console logs to demonstrate successful and failed reloads.
- What you can do after
- Operate/configure it with Quarkus Dev mode commands, request-triggered reloads, and the optional instrumentation setting.
Pro Angular 16
Hot reload is a development technique that updates a running application after source changes without requiring a full restart.
- How it is used
- Provides automatic browser feedback after saved source changes during Angular development.
- How deep it goes
- Explains change detection, selective bundle rebuilding, and the server signal that reloads the browser; does not describe preserving page state.
- Examples
- Uses `main.ts` console messages and an `app.component.html` template edit, with browser output and a build report.
- What you can do after
- Operate/configure it by running `ng serve`, saving an edit, and checking the browser or build output for the result.
.NET MAUI in Action
Hot reload on file save is an automatic hot-reload mode that applies supported changes when a source file is saved.
- How it is used
- Accelerates the inner development loop for .NET MAUI apps by showing supported edits while the app continues running.
- How deep it goes
- Explains file-save activation, supported edits, and rebuild limits caused by immutable CLR metadata and resources.
- Examples
- Uses greeting edits, XAML layout changes, and a custom Dotnet Bot image to contrast reloadable and rebuild-required changes.
- What you can do after
- Apply it via Visual Studio to iterate on running .NET MAUI interfaces without restarting after every supported edit.
Related concepts
- dotnet watchused by · dotnet watch is a .NET CLI tool that monitors project files and reruns, rebuilds, or reloads an application when supported changes occur.
- Quarkus dev modeused by · Quarkus dev mode is a Quarkus development mode that provides rapid code-change feedback without restarting the application.
- Visual Studiouses · Visual Studio is Microsoft's integrated development environment for creating, building, debugging, and testing software across programming languages and platforms.
- Dockercontrasts with · Docker is a platform and ecosystem for building, distributing, and running applications in containers.
- nodemonimplemented by · nodemon is a command-line development tool that monitors files and automatically restarts a Node.js application when changes are detected.
- continuous testingused by · Continuous testing is the automated and repeated evaluation of software throughout development and delivery to provide rapid feedback on changes.
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