Revert "Remove events trait"

This reverts commit ce7fa775e2.

src/Traits/TenantManagerEvents.php

@@ -0,0 +1,129 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Traits;
+
+use Illuminate\Support\Collection;
+
+trait TenantManagerEvents
+{
+    /**
+     * Event listeners.
+     *
+     * @var callable[][]
+     */
+    protected $listeners = [
+        'bootstrapping' => [],
+        'bootstrapped' => [],
+        'ending' => [],
+        'ended' => [],
+    ];
+
+    /**
+     * Integration listeners.
+     *
+     * @var callable[][]
+     */
+    protected $integrationListeners = [];
+
+    /**
+     * Register a listener that will be executed before tenancy is bootstrapped.
+     *
+     * @param callable $callback
+     * @return self
+     */
+    public function bootstrapping(callable $callback)
+    {
+        $this->listeners['bootstrapping'][] = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Register a listener that will be executed after tenancy is bootstrapped.
+     *
+     * @param callable $callback
+     * @return self
+     */
+    public function bootstrapped(callable $callback)
+    {
+        $this->listeners['bootstrapped'][] = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Register a listener that will be executed before tenancy is ended.
+     *
+     * @param callable $callback
+     * @return self
+     */
+    public function ending(callable $callback)
+    {
+        $this->listeners['ending'][] = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Register a listener that will be executed after tenancy is ended.
+     *
+     * @param callable $callback
+     * @return self
+     */
+    public function ended(callable $callback)
+    {
+        $this->listeners['ended'][] = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Fire an event.
+     *
+     * @param string $name Event name
+     * @return Collection Prevented events
+     */
+    public function event(string $name): Collection
+    {
+        return \array_reduce($this->listeners[$name], function ($prevents, $listener) {
+            return $prevents->merge($listener($this) ?? []);
+        }, collect([]));
+    }
+
+    /**
+     * Register a callback for an integration event.
+     *
+     * @param string $name
+     * @param callable $callback
+     * @return void
+     */
+    public function integrationEvent(string $name, callable $callback)
+    {
+        if (\array_key_exists($name, $this->integrationListeners)) {
+            $this->integrationListeners[$name][] = $callback;
+        } else {
+            $this->integrationListeners[$name] = [$callback];
+        }
+    }
+
+    /**
+     * Return callbacks for an integration event.
+     *
+     * @param string $name
+     * @param mixed $arguments,...
+     * @return callable[]
+     */
+    public function integration(string $name, ...$arguments)
+    {
+        if ($arguments) {
+            // If $arguments are supplied, execute all listeners with arguments.
+            return \array_reduce($this->integrationListeners[$name] ?? [], function ($tags, $listener) use ($arguments) {
+                return \array_merge($tags, $listener(...$arguments));
+            }, []);
+        }
+
+        return $this->integrationListeners[$name];
+    }
+}