README

Message Bus, Command Bus, Query Bus and Event Bus.

Features

• Command Bus
• Query Bus
• Event Bus
• Map Handlers using PHP 8 Attributes

Requirements

The following versions of PHP are supported: 7.1, 7.2, 7.3, 7.4, 8.0.

Install

$ composer require brenoroosevelt/oni-bus

Usage

Command Bus

<?php
use OniBus\Command\Command;   

class UserRegistrationCommand implements Command
{
    public $username;
    public $password;
}

<?php
use OniBus\Attributes\CommandHandler;

class UserRegistrationHandler
{
    #[CommandHandler]
    public function register(UserRegistrationCommand $userRegistration)
    {
        /* ... */
        return new UserDTO(/* ... */);
    }
}

<?php
use OniBus\Attributes\CommandHandler;
use OniBus\Buses\DispatchToHandler;
use OniBus\Command\CommandBus;
use OniBus\Handler\Builder\Resolver;

$resolver = 
    Resolver::new(new MyPsr11Container())
        ->withHandlers([UserRegistrationHandler::class])
        ->mapByAttributes(CommandHandler::class);

$commandBus = new CommandBus(new DispatchToHandler($resolver));

$userDTO = $commandBus->dispatch(new UserRegistrationCommand('username', 'secret'));

Query Bus

<?php
use OniBus\Query\Query;   

class UserByStatus implements Query
{
    protected $status;
    
    public function __construct(string $status)
    {
           $this->status = $status;
    }
    
    public function getStatus(): string
    {
        return $this->status;
    }
}

<?php
use OniBus\Attributes\QueryHandler;

class FindUserByStatusSQL
{
    #[QueryHandler]
    public function fetch(UserByStatus $query)
    {
        return [/* ... */];
    }
}

<?php
use OniBus\Attributes\QueryHandler;
use OniBus\Buses\DispatchToHandler;
use OniBus\Query\QueryBus;
use OniBus\Handler\Builder\Resolver;

$resolver = 
    Resolver::new(new MyPsr11Container())
        ->withHandlers([FindUserByStatusSQL::class])
        ->mapByAttributes(QueryHandler::class);

$queryBus = new QueryBus(new DispatchToHandler($resolver));

$users = $queryBus->dispatch(new UserByStatus('active'));

EventBus Bus

<?php
use OniBus\Event\Event;  

class UserCreatedEvent implements Event
{
    protected $username;
    
    public function __construct(string $username)
    {
           $this->username = $username;
    }
    
    public function getUsername(): string
    {
        return $this->username;
    }
}

<?php
use OniBus\Attributes\EventListener;

class CreateUserProfile
{
    #[EventListener]
    public function createProfile(UserCreatedEvent $event)
    {
        /* ... */
    }
}

<?php
use OniBus\Attributes\EventListener;
use OniBus\Buses\DispatchToHandler;
use OniBus\Event\EventBus;
use OniBus\Handler\Builder\Resolver;

$resolver = 
    Resolver::new(new MyPsr11Container())
        ->withHandlers([CreateUserProfile::class])
        ->mapByAttributes(EventListener::class);

$eventBus = new EventBus(new DispatchToHandler($resolver));

$eventBus->dispatch(new UserCreatedEvent('username'));

Bus Chain

<?php

/* CONTAINER */
$container = new MyPsr11Container();

/* EVENT BUS */
$eventResolver = 
    Resolver::new($container)
        ->withHandlers([CreateUserProfile::class])
        ->mapByAttributes(EventListener::class);
       
$eventBus = new EventBus(new DispatchToHandler($eventResolver));

/* COMMAND BUS */
$commandResolver = 
    Resolver::new($container)
        ->withHandlers([UserRegistrationHandler::class])
        ->mapByAttributes(CommandHandler::class);

$commandBus = 
     new CommandBus(
        new EventsDispatcher(
            EventManager::eventProvider(),
            $eventBus,
        ),
        // new ProtectOrder(),
        // new Transactional(),
        new DispatchToHandler($commandResolver)
    );

Container Configuration

<?php
use OniBus\Command\CommandBus;

$container->add(CommandBus::class, $commandBus);

Controller

<?php

class UserRegistrationController
{
    protected $commandBus;
    
    public function __construct(CommandBus $commandBus) 
    {
        $this->commandBus = $commandBus;    
    }

    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, array $args = []): ResponseInterface
    {
        $body = $request->getParsedBody();
        $command = new UserRegistrationCommand($body['username'], $body['password']);
        $user = $this->commandBus->dispatch($command);
        $response->getBody()->write($user);
        return $response;
    }

Contributing

Please read the Contributing guide to learn about contributing to this project.

License

This project is licensed under the terms of the MIT license. See the LICENSE file for license rights and limitations.