Command Bus

The command bus exists to execute write-or-fail commands within the domain of the application.

The command bus exists of 4 components.

• Command
  The DTO containing the intent and data to execute the command.
• Command Translator
  Takes a command, and translates to the command handler class name.
• Handler Resolver
  Resolves (generates) the object that executes the given command
• Middleware
  Sits between CommandBus::execute() and the execution of the command. Similar to HTTP middleware.

Examples

<?php // Define as many middlewares as you like,
// the given one uses the simple translator and resolver to // generate the command handler
$middleware = [
new SmoothPhp\CommandBus\CommandHandlerMiddleware(
new SmoothPhp\CommandBus\SimpleCommandTranslator,
new SmoothPhp\CommandBus\SimpleCommandHandlerResolver
)
]; // Create the bus with the middle ware
$bus = new SmoothPhp\CommandBus\CommandBus($middleware); // Create the command
$command = new SignUpToNewsletter($memberId, $newsletterId); // Send to command bus
$bus->execute($command);