# angel3_file_service
[![version](https://img.shields.io/badge/pub-v4.0.1-brightgreen)](https://pub.dartlang.org/packages/angel3_file_service)
[![Null Safety](https://img.shields.io/badge/null-safety-brightgreen)](https://dart.dev/null-safety)
[![Gitter](https://img.shields.io/gitter/room/angel_dart/discussion)](https://gitter.im/angel_dart/discussion)

[![License](https://img.shields.io/github/license/dukefirehawk/angel)](https://github.com/dukefirehawk/angel/tree/angel3/packages/file_service/LICENSE)

Angel service that persists data to a file on disk, stored as a JSON list. It uses a simple
mutex to prevent race conditions, and caches contents in memory until changes
are made.

The file will be created on read/write, if it does not already exist.

This package is useful in development, as it prevents you from having to install
an external database to run your server.

When running a multi-threaded server, there is no guarantee that file operations
will be mutually excluded. Thus, try to only use this one a single-threaded server
if possible, or one with very low load.

While not necessarily *slow*, this package makes no promises about performance.

# Usage
```dart
configureServer(Angel app) async {
  // Just like a normal service
  app.use(
    '/api/todos',
    new JsonFileService(
      const LocalFileSystem().file('todos_db.json')
    ),
  );
}
```