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Symfony Messenger
Build your own Command | Query | Event Bus
Michał Kurzeja
@michalkurzeja
michal@accesto.com
CQS
Command Query Separation
Fetch value or change state, never both!
CQRS
Command
+handler
Query

+handler
Command Bus
Query Bus
Event Bus
Command | Query | Event Bus
Fundamental differences
Command Bus Query Bus Event Bus
# of handlers 1 1 0-N
Can return value No Yes No
Async? Might be Shouldn’t Might be
But this talk is not about CQRS….
Existing Message Bus solutions
Tactician
Simple Bus
Prooph Service Bus
Symfony Messenger
A PSR around the corner….
Symfony Messenger
composer require symfony/messenger
Unfortunately, a bit complicated approach
Example 1 - Simple command bus
Idea
Simple Todo list
class AddNewTodo
{
/**
* @var UuidInterface
*/
private $uuid;
/**
* @var string
*/
private $task;
/**
* @var DateTimeImmutable
*/
private $deadline;
/**
* @var bool
*/
private $done;
Command
class AddNewToDoHandler
{
/**
* @var ToDoRepository
*/
private $repository;
public function __invoke(AddNewTodo $addNewTodo)
{
$todo = new ToDo(
$addNewTodo->uuid(),
$addNewTodo->task(),
$addNewTodo->done(),
$addNewTodo->deadline()
);
$this->repository->save($todo);
}
}
Handler
$c[AddNewToDoHandler::class] = function ($c) {
return new AddNewToDoHandler($c[ToDoRepository::class]);
};
DI config
$c['command_bus.handler_locator'] = function ($c) {
return new HandlersLocator([
AddNewTodo::class => [AddNewToDoHandler::class => $c[AddNewToDoHandler::class]],
]);
};
Map Command -> Handler
$c['command_bus'] = function ($c) {
return new MessageBus(
[
new HandleMessageMiddleware($c['command_bus.handler_locator']),
]
);
};
$addNewTodo = AddNewTodo::add($uuid, $task, $deadline);
$this->container['command_bus']->dispatch($addNewTodo);
Middleware
Middleware 1 Middleware 2 Middleware 3
// logic
next() // logic
next() // logic
next()
// more logic
// more logic
// more logic
Example 2 - additional middleware
Middleware - let’s add logging*
* Not really needed as it is already implemented
class LoggingMiddleware implements MiddlewareInterface
{
public function handle(Envelope $envelope, StackInterface $stack): Envelope
{
$message = $envelope->getMessage();
$this->logger->debug(sprintf('Started handling of %s', get_class($message)));
$result = $stack->next()->handle($envelope, $stack);
$this->logger->debug(sprintf('Finished handling of %s', get_class($message)));
return $result;
}
}
Middleware use-cases
DB Transaction
Dispatch event
Validate command
….
Example 3 - Envelopes
Envelope - Request tracking
class RequestIdStamp implements StampInterface
{
/**
* @var string
*/
private $requestId;
public function __construct(string $requestId)
{
$this->requestId = $requestId;
}
public function requestId(): string
{
return $this->requestId;
}
}
$requestId = Uuid::uuid4()->toString();
$addNewTodo = AddNewTodo::add($uuid, $task, $deadline);
$this->container['command_bus']->dispatch(
(new Envelope($addNewTodo))->with(new RequestIdStamp($requestId))
);
$requestId = null;
$requestIdStamps = $envelope->all(RequestIdStamp::class);
if (count($requestIdStamps)) {
$requestId = $requestIdStamps[0]->requestId();
}
$this->logger->debug(sprintf('[%s] Started handling of %s',
$requestId, get_class($message)));
$result = $stack->next()->handle($envelope, $stack);
$this->logger->debug(sprintf('[%s] Finished handling of %s',
$requestId, get_class($message)));
Example 4 - transports
Transport - csv file
class FileSender implements SenderInterface
{
public function send(Envelope $envelope): Envelope
{
$file = fopen($this->filePath, 'a');
$message = $envelope->getMessage();
fputcsv(
$file,
[
$message->uuid()->toString(),
$message->task(),
$message->deadline() ? $message->deadline()->format('Y-m-d') : '',
$message->done() ? 'Y' : 'N',
]
);
fclose($file);
return $envelope;
}
}
class FileReceiver implements ReceiverInterface
{
public function receive(callable $handler): void
{
$file = fopen($this->filePath, 'r');
while (!$this->shouldStop) {
while (($data = fgetcsv($file)) !== false) {
try {
$deadline = new DateTimeImmutable($data[3]);
} catch (Exception $e) {
$deadline = null;
}
$addTodo = new AddNewTodo(
Uuid::fromString($data[0]),
$data[1],
$data[2] === 'Y',
$deadline
);
$handler(new Envelope($addTodo));
}
sleep(1);
}
fclose($file);
}
}
Query Bus
class ListTodo
{
}
class ListTodoHandler
{
/**
* @var ToDoRepository
*/
private $repository;
public function __construct(ToDoRepository $repository)
{
$this->repository = $repository;
}
public function __invoke(ListTodo $listTodo)
{
return $this->repository->findAll();
}
}
$c[ListTodoHandler::class] = function ($c) {
return new ListTodoHandler($c[ToDoRepository::class]);
};
$c['query_bus.handler_locator'] = function ($c) {
return new HandlersLocator([
ListTodo::class => [ListTodoHandler::class =>
$c[ListTodoHandler::class]]
]);
};
$c['query_bus'] = function ($c) {
return new MessageBus(
[
new HandleMessageMiddleware($c['query_bus.handler_locator']),
]
);
};
/**
* @var $envelope Envelope
*/
$envelope = $this->container['query_bus']->dispatch(new ListTodo());
/**
* @var $handledStamp HandledStamp
*/
$handledStamp = $envelope->last(HandledStamp::class);
$todos = $handledStamp->getResult();
Event Bus
Send e-mail with new todo
class TodoAdded
{
/**
* @var UuidInterface
*/
private $uuid;
/**
* @var string
*/
private $task;
/**
* @var DateTimeImmutable
*/
private $deadline;
/**
* @var bool
*/
private $done;
public static function fromCommand(AddNewTodo $addNewTodo): TodoAdded
{
return new self($addNewTodo->uuid(), $addNewTodo->task(), $addNewTodo->deadline(),
$addNewTodo->done());
}
class SendNewTodoToEmail
{
public function __invoke(TodoAdded $todoAdded)
{
printf("nNew todo e-mail notification: %sn", $todoAdded->task());
}
}
class AddNewToDoHandler
{
/**
* @var MessageBus
*/
private $eventBus;
public function __invoke(AddNewTodo $addNewTodo)
{
(…)
$todoAdded = TodoAdded::fromCommand($addNewTodo);
$this->eventBus->dispatch($todoAdded);
}
}
$c[SendNewTodoToEmail::class] = function ($c) {
return new SendNewTodoToEmail();
};
$c['event_bus.handler_locator'] = function ($c) {
return new HandlersLocator([
TodoAdded::class => [SendNewTodoToEmail::class =>
$c[SendNewTodoToEmail::class]]
]);
};
$c['event_bus'] = function ($c) {
return new MessageBus(
[
new HandleMessageMiddleware($c['event_bus.handler_locator'], true),
]
);
}; Allow no handler
Even easier with Symfony Framework
class DefaultController extends AbstractController
{
public function index(MessageBusInterface $bus)
{
$bus->dispatch(new SmsNotification('A string to be sent...'));
}
}
class SmsNotificationHandler implements MessageHandlerInterface
{
public function __invoke(SmsNotification $message)
{
// do something with it.
}
}
No extra DI config needed, even tagging!
Easier routing
Debugging
https://symfony.com/doc/current/messenger.html
And more
Michał Kurzeja
@michalkurzeja
michal@accesto.com
Questions?

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