Split interfaces and base/abstract classes into more sensible pieces

src/Monolog/Handler/ProcessableHandlerTrait.php

@@ -0,0 +1,67 @@
+<?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;
+
+/**
+ * Helper trait for implementing ProcessableInterface
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+trait ProcessableHandlerTrait
+{
+    /**
+     * @var callable[]
+     */
+    protected $processors = [];
+
+    /**
+     * {@inheritdoc}
+     */
+    public function pushProcessor(callable $callback)
+    {
+        if (!is_callable($callback)) {
+            throw new \InvalidArgumentException('Processors must be valid callables (callback or object with an __invoke method), '.var_export($callback, true).' given');
+        }
+        array_unshift($this->processors, $callback);
+
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function popProcessor()
+    {
+        if (!$this->processors) {
+            throw new \LogicException('You tried to pop from an empty processor stack.');
+        }
+
+        return array_shift($this->processors);
+    }
+
+    /**
+     * Processes a record.
+     *
+     * @param  array $record
+     * @return array
+     */
+    protected function processRecord(array $record)
+    {
+        foreach ($this->processors as $processor) {
+            $record = $processor($record);
+        }
+
+        return $record;
+    }
+}