From 2194bc4a019fcc1de191c76ab8a905b04b029292 Mon Sep 17 00:00:00 2001
From: Valentin Popov <info@valentineus.link>
Date: Sun, 9 Sep 2018 03:23:12 +0400
Subject: Refactoring the event handler

Event processing is asynchronous.  For asynchronous processing, events
are added to the job queue.

Signed-off-by: Valentin Popov <info@valentineus.link>
---
 classes/event_observer.php | 48 ++++++++++++++++++++++++++++++++++++++++
 classes/handler.php        | 55 ----------------------------------------------
 db/events.php              | 15 +++++--------
 3 files changed, 54 insertions(+), 64 deletions(-)
 create mode 100644 classes/event_observer.php
 delete mode 100644 classes/handler.php

diff --git a/classes/event_observer.php b/classes/event_observer.php
new file mode 100644
index 0000000..9ab4a35
--- /dev/null
+++ b/classes/event_observer.php
@@ -0,0 +1,48 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Handlers of observers for events.
+ *
+ * @copyright 2018 'Valentin Popov' <info@valentineus.link>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @package   local_webhooks
+ */
+
+namespace local_webhooks;
+
+defined( "MOODLE_INTERNAL" ) || die();
+
+/**
+ * Defines event handlers.
+ *
+ * @copyright 2018 'Valentin Popov' <info@valentineus.link>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @package   local_webhooks
+ */
+class event_observer {
+    /**
+     * Handler of all the events.
+     * Each event is put into the job queue.
+     *
+     * @param object $event
+     */
+    public static function observe_all( $event ) {
+        $task = new \local_webhooks\task\process_events_task();
+        $task->set_custom_data( $event->get_data() );
+        \core\task\manager::queue_adhoc_task( $task );
+    }
+}
\ No newline at end of file
diff --git a/classes/handler.php b/classes/handler.php
deleted file mode 100644
index 3bc69cf..0000000
--- a/classes/handler.php
+++ /dev/null
@@ -1,55 +0,0 @@
-<?php
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * The event handler.
- *
- * @package   local_webhooks
- * @copyright 2017 "Valentin Popov" <info@valentineus.link>
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-namespace local_webhooks;
-
-defined("MOODLE_INTERNAL") || die();
-
-require_once(__DIR__ . "/../lib.php");
-
-/**
- * Defines event handlers.
- *
- * @copyright 2017 "Valentin Popov" <info@valentineus.link>
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-class handler {
-    /**
-     * External handler.
-     *
-     * @param object $event
-     */
-    public static function events($event) {
-        /* Gets the information about the event */
-        $data = $event->get_data();
-
-        /* Gets a list of involved services */
-        if (!empty($records = local_webhooks_get_list_records_by_event($data["eventname"]))) {
-            foreach ($records as $record) {
-                /* Sends an alert */
-                local_webhooks_send_request($data, $record);
-            }
-        }
-    }
-}
\ No newline at end of file
diff --git a/db/events.php b/db/events.php
index a2313c2..9fdf7d4 100644
--- a/db/events.php
+++ b/db/events.php
@@ -15,21 +15,18 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
- * Interception of all events in the system.
+ * Registration of observers for events.
  *
- * @package   local_webhooks
- * @copyright 2017 "Valentin Popov" <info@valentineus.link>
+ * @copyright 2018 'Valentin Popov' <info@valentineus.link>
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @package   local_webhooks
  */
 
-defined("MOODLE_INTERNAL") || die();
+defined( "MOODLE_INTERNAL" ) || die();
 
 $observers = array(
     array(
-        "callback"    => "\local_webhooks\\handler::events",
-        "eventname"   => "*",
-        "includefile" => null,
-        "internal"    => true,
-        "priority"    => 200
+        "callback"  => "\local_webhooks\\event_observer::observe_all",
+        "eventname" => "*"
     )
 );
\ No newline at end of file
-- 
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