Initial commit

src/CommandRegistry.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace NoccyLabs\React\CommandBus;
+use Evenement\EventEmitterInterface;
+use Evenement\EventEmitterTrait;
+
+/**
+ * A collection of commands that can be executed via CommandBusInterface
+ *
+ */
+class CommandRegistry implements EventEmitterInterface
+{
+    use EventEmitterTrait;
+
+    const EVENT_REGISTERED = 'registered';
+    const EVENT_UNREGISTERED = 'unregistered';
+
+    /** @var array<string,Command> */
+    private array $commands = [];
+
+    public function register(string $command, callable $handler): void
+    {
+        $isNew = !array_key_exists($command, $this->commands);
+
+        $this->commands[$command] = new Command($command, $handler);
+
+        if ($isNew) {
+            $this->emit(self::EVENT_REGISTERED, [ $command ]);
+        }
+    }
+
+    public function unregister(string $command): void
+    {
+        if (!array_key_exists($command, $this->commands)) {
+            return;
+        }
+
+        unset($this->commands[$command]);
+
+        $this->emit(self::EVENT_UNREGISTERED, [ $command ]);
+    }
+
+    public function find(string $command): ?Command
+    {
+        return $this->commands[$command] ?? null;
+    }
+
+    public function getNames(): array
+    {
+        return array_keys($this->commands);
+    }
+}
+