Dispatching Commands

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Commands PHP
Previous pages provide the background on how to handle command messages in your application. The dispatching process is the starting point for command message.
Command Bus
Command Bus is special type of Messaging Gateway. 
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namespace Ecotone\Modelling;
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​
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interface CommandBus
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{
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    // 1
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    public function send(object $command, array $metadata = []) : mixed;
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​
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    // 2
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    public function sendWithRouting(string $routingKey, mixed $command, string $commandMediaType = MediaType::APPLICATION_X_PHP, array $metadata = []) : mixed;
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}
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Send method
Command is routed to the Handler by class type.
Symfony / Laravel
Lite
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// Command Bus will be auto registered in Depedency Container.
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class TicketController
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{
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   private CommandBus $commandBus;
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​
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   public function __construct(CommandBus $commandBus)
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   {
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       $this->commandBus = $commandBus;   
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   }
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   public function closeTicketAction(Request $request) : Response
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   {
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      $this->commandBus->send(
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         new CloseTicketCommand($request->get("ticketId"))
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      );
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   }
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}
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$commandBus = $messagingSystem->getGatewayByName(CommandBus::class);
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​
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$commandBus->send(new CloseTicketCommand($ticketId));
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Command Handler
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class CloseTicketCommandHandler
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{   
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    #[CommandHandler]
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    public function closeTicket(CloseTicketCommand $command)
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    {
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//        handle closing ticket
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    }   
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}
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Send With Metadata
Does allow for passing extra meta information, that can be used on targeted Command Handler.
Symfony / Laravel
Lite
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class TicketController
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{
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   private CommandBus $commandBus;
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​
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   public function __construct(CommandBus $commandBus)
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   {
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       $this->commandBus = $commandBus;   
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   }
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   public function closeTicketAction(Request $request, Security $security) : Response
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   {
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      $this->commandBus->sendWithMetadata(
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         new CloseTicketCommand($request->get("ticketId")),
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         ["executorUsername" => $security->getUser()->getUsername()]
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      );
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   }
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}
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$commandBus = $messagingSystem->getGatewayByName(CommandBus::class);
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​
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$commandBus->sendWithMetadata(
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   new CloseTicketCommand($ticketId),
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   ["executorUsername" => $executorUsername]
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);
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Command Handler
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class CloseTicketCommandHandler
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{   
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    #[CommandHandler]
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    public function closeTicket(CloseTicketCommand $command, array $metadata)
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    {
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          $ticket = ; // get Ticket using command
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          if ($metadata["executorUsername"] !== $ticket->getOwner()) {
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             throw new \InvalidArgumentException("Insufficient permissions")
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          }
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//        handle closing ticket
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    }   
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}
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Send With Routing
Is used with Command Handlers, routed by name and converted using Converter if needed.
Symfony / Laravel
Lite
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class TicketController
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{
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   private CommandBus $commandBus;
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​
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   public function __construct(CommandBus $commandBus)
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   {
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       $this->commandBus = $commandBus;   
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   }
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   public function closeTicketAction(Request $request) : Response
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   {
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      $commandBus->convertAndSend("closeTicket", "application/json", '{"ticketId": 123}');
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   }
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}
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$commandBus = $messagingSystem->getGatewayByName(CommandBus::class);
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​
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$commandBus->convertAndSend(
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   "closeTicket", 
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   "application/json", 
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   '{"ticketId": 123}'
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);
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Command Handler
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class CloseTicketCommandHandler
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{   
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    #[CommandHandler]
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    public function closeTicket(CloseTicketCommand $command)
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    {
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//        handle closing ticket
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    }   
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}
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Query Handling
Last modified 8mo ago
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