Command Bus component

dev-master 2015-01-18 14:37 UTC

This package is auto-updated.

Last update: 2022-11-29 01:50:55 UTC


This standalone component implements the Command Pattern.

It is inspired by the Laravel illuminate/bus and illuminate/queue components, but aims to be framework agnostic.

For more information about the Command Bus Pattern:


Any Command requires two classes: the DoSomethingCommand class and the DoSomethingHandler class.

You can instantiate the Command from your controllers when needed, and dispatch it onto the Bus.

The Bus will then resolve the matching Handler class, and ask it to handle the new Command.

Here's how you use it:

An example Command class:


use LinkORB\Component\Bus\CommandInterface;

class OrderConfirmCommand implements CommandInterface
    private $orderId;
    public function __construct($orderId)
        $this->orderId = $orderId;
    public function getOrderId()
        return $this->orderId;

An example Handler class:


use LinkORB\Component\Bus\HandlerInterface;
use LinkORB\Component\Bus\CommandInterface;

class OrderConfirmHandler implements HandlerInterface
    private $db;
    private $mailer;
    // the constructor automatically receives requested services from the container
    public function __construct($db, $mailer)
        $this->db = $db;
        $this->mailer = $mailer;

    // this method is called by the bus to handle commands
    public function handle(CommandInterface $command)
        $order = $this->db->fetchOneById('orders', $command->getOrderId());
        $this->mailer->mail($order['email'], "Thanks for your order, " . $order['customername']);

Setting up the bus in your init script

use LinkORB\Component\Bus\Bus;

// Reuse an existing container, or create a plain php array
// Any array type dependency injection container will work too (symfony, pimple, etc)
$container = array(

// Instantiate the bus, and optionally pass a container
$bus = new Bus($container);

// now add the bus to the container, or use any other method to pass the bus to your controllers

Using the bus in your Controllers:

class basketController
    public function confirmAction()
        $orderid = 5;

        // Instantiate a Command
        $command = new OrderConfirmCommand($orderid);

        // Dispatch the command

Calling commands from the command-line

A simple command-line dispatcher is included. It can be used like this:

./vendor/bin/bus bus:dispatch "Acme\Bus\DoSomethingCommand" -p color="red" -g os="linux"

The -p arguments will be passed as parameters to the command. You can pass as many as you want. The -g arguments will be inserted into a simple array "container", so it can be used by the Handlers

One example command is included:

./vendor/bin/bus bus:dispatch "LinkORB\Component\Bus\Bus\HelloCommand" -p name="World" -g sender="me"

This will output:

Hello, World from me!


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