Namespaces

• ICanBoogie
  • MessageBus

Classes

• SimpleMessageBus
• SimpleMessageHandlerProvider

Interfaces

• Exception
• Message
• MessageBus
• MessageHandler
• MessageHandlerProvider
• MessagePusher
• MessageToPush

Exceptions

• NoHandlerForMessage
• NoPusherForMessage

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<?php

/*
 * This file is part of the ICanBoogie package.
 *
 * (c) Olivier Laviale <olivier.laviale@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace ICanBoogie\MessageBus;

/**
 * A message bus that can handle messages right away or push them to a queue.
 */
class SimpleMessageBus implements MessageBus
{
    /**
     * @var MessageHandlerProvider|callable
     */
    private $message_handler_provider;

    /**
     * @var MessagePusher|callable
     */
    private $message_pusher;

    /**
     * @param MessageHandlerProvider|callable $message_handler_provider
     * @param MessagePusher|callable $message_pusher
     */
    public function __construct(callable $message_handler_provider, callable $message_pusher = null)
    {
        $this->message_handler_provider = $message_handler_provider;
        $this->message_pusher = $message_pusher;
    }

    /**
     * @param Message $message
     *
     * @return mixed
     */
    public function dispatch(Message $message)
    {
        if ($message instanceof MessageToPush)
        {
            return $this->push($message);
        }

        return $this->handle($message);
    }

    /**
     * @param Message $message
     *
     * @return mixed
     */
    protected function push(Message $message)
    {
        $pusher = $this->message_pusher;

        if (!$pusher)
        {
            throw new NoPusherForMessage($message);
        }

        return $pusher($message);
    }

    /**
     * @param Message $message
     *
     * @return mixed
     */
    protected function handle(Message $message)
    {
        $handler = $this->resolve_handler($message);

        return $handler($message);
    }

    /**
     * @param Message $message
     *
     * @return MessageHandler|callable
     *
     * @throws NoHandlerForMessage
     */
    protected function resolve_handler(Message $message)
    {
        $provider = $this->message_handler_provider;

        return $provider($message);
    }
}