Rename to GroupHandler, remove callback support, add couple of tests

src/Monolog/Handler/GroupHandler.php

@@ -0,0 +1,82 @@
+<?php
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Handler;
+
+use Monolog\Logger;
+
+/**
+ * Forwards records to multiple handlers
+ *
+ * @author Lenar Lõhmus <lenar@city.ee>
+ */
+class ForwarderHandler extends AbstractHandler
+{
+    private $handlersInitialized;
+    protected $handlers;
+
+    /**
+     * @param Array $handlers Array of Handlers or factory callbacks($record, $fingersCrossedHandler).
+     * @param Boolean $bubble Whether the messages that are handled can bubble up the stack or not
+     */
+    public function __construct(array $handlers, $bubble = false)
+    {
+        $this->handlersInitialized = false;
+        $this->handlers = $handlers;
+        $this->bubble = $bubble;
+    }
+    
+    /**
+     * {@inheritdoc}
+     */
+    public function handle(array $record)
+    {
+        $this->handlersInitialized || $this->initializeHandlers();
+        
+        foreach ($this->handlers as $handler) {
+            $handler->handle($record);
+        }
+        return false === $this->bubble;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function handleBatch(array $records)
+    {
+        $this->handlersInitialized || $this->initializeHandlers();
+
+        foreach ($this->handlers as $handler) {
+            $handler->handleBatch($records);
+        }
+    }
+ 
+    /**
+     * Implemented to comply with the AbstractHandler requirements. Can not be called.
+     */
+    protected function write(array $record)
+    {
+        throw new \BadMethodCallException('This method should not be called directly on the ForwarderHandler.');
+    }
+    
+    private function initializeHandlers()
+    {
+        foreach ($this->handlers as &$handler) {
+            if (!$handler instanceof HandlerInterface) {
+                $handler = call_user_func($handler, $record, $this);
+                if (!$handler instanceof HandlerInterface) {
+                    throw new \RuntimeException("The factory callback should return a HandlerInterface");
+                }
+            }
+        }
+        $this->handlersInitialized = true;
+    }
+}