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<?php class CommandHandler { public function handle($cmd) { //... $this->eventBus->dispatch($events); } } interface EventBus { public function registerListener(Listener $listener); public function dispatch($events); // foreach $event traverse listeners calling when($event) } abstract class Listener { public function __construct(EventBus $bus) { $bus->registerListener($this); } public function when($event) { // call $this->onEvent() if it exsits } } class SomeListener { public function onSomeEvent($event) { // do something } }
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