alpha-dic
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3.3.0 • Public • Published

Alpha DIC

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Flexible Dependency Injection Container with support for asynchronous service creation, annotations and middlewares.

Features:

  • Autowiring
  • Supports middlewares
  • Allows to define service as constructor, (async) factory or a value
  • Detects cycle dependencies
  • Prevents race condition for concurrent service requests
  • Supports annotations (and ability to search services by annotations)
  • Simple service definition via container methods or decorators

Installation

npm install alpha-dic

Example

import {createStandard} from 'alpha-dic';

const container = createStandard();
// if you're defining services via decorators
// preloadServiceModules(container, './path/to/service/modules/*')

container.definitionWithFactory('my-service', async () => {
        const connection = new DatabaseConnection();
        await connection.connect();
        return connection;
    });

container.get('my-service').then((connection) => {
    // connection has been established in factory
});

Example with dependencies and decorators

import {createStandard, reference, AutowiredService, Service, OnActivation} from 'alpha-dic';
import * as assert from 'assert';

const container = createStandard();

@AutowiredService('NotificationCenter')
class NotificationCenter {
    constructor(renderer: EmailRenderer, sender: EmailSender) {
        assert.ok(renderer instanceof EmailRenderer);
        // connection to SMTP was established in factory
        assert.ok(sender instanceof EmailSender);
    }
    async sendEmail(to, type, vars) {
        // render email
        // send it via sender
    }
}

@Service()
class EmailRenderer {
    
}

@Service()
@OnActivation(async (mailer) => {
    await mailer.connectToSMTP();
    return mailer;
})
class EmailSender {
    
}

container.get('NotificationCenter')
    .then((centre) => {
        return centre.sendEmail('admin@example.com', 'limits-exceeded', {})
    })

Package Sidebar

Install

npm i alpha-dic

Weekly Downloads

13

Version

3.3.0

License

MIT

Unpacked Size

149 kB

Total Files

87

Last publish

Collaborators

  • wookieb