MDL-47900 tool_monitor: created list of rules MUC

admin/tool/monitor/classes/eventobservers.php

@@ -98,6 +98,11 @@ public static function process_event(\core\event\base $event) {
      */
     protected function buffer_event(\core\event\base $event) {
 
+        // If there are no subscriptions for this event do not buffer it.
+        if (!\tool_monitor\subscription_manager::event_has_subscriptions($event->eventname, $event->courseid)) {
+            return;
+        }
+
         $eventdata = $event->get_data();
         $eventobj = new \stdClass();
         $eventobj->eventname = $eventdata['eventname'];

admin/tool/monitor/classes/subscription_manager.php

@@ -78,6 +78,10 @@ public static function create_subscription($ruleid, $courseid, $cmid, $userid =
             );
             $event = \tool_monitor\event\subscription_created::create($params);
             $event->trigger();
+
+            // Let's invalidate the cache.
+            $cache = \cache::make('tool_monitor', 'eventsubscriptions');
+            $cache->delete($courseid);
         }
 
         return $subscription->id;
@@ -126,6 +130,10 @@ public static function delete_subscription($subscriptionorid, $checkuser = true)
             $event = \tool_monitor\event\subscription_deleted::create($params);
             $event->add_record_snapshot('tool_monitor_subscriptions', $subscription);
             $event->trigger();
+
+            // Let's invalidate the cache.
+            $cache = \cache::make('tool_monitor', 'eventsubscriptions');
+            $cache->delete($courseid);
         }
 
         return $success;
@@ -198,6 +206,10 @@ public static function remove_all_subscriptions_for_rule($ruleid, $coursecontext
                 $event = \tool_monitor\event\subscription_deleted::create($params);
                 $event->add_record_snapshot('tool_monitor_subscriptions', $subscription);
                 $event->trigger();
+
+                // Let's invalidate the cache.
+                $cache = \cache::make('tool_monitor', 'eventsubscriptions');
+                $cache->delete($courseid);
             }
         }
 
@@ -380,4 +392,68 @@ public static function count_rule_subscriptions($ruleid) {
 
         return $DB->count_records_sql($sql, array('ruleid' => $ruleid));
     }
+
+    /**
+     * Returns true if an event in a particular course has a subscription.
+     *
+     * @param string $eventname the name of the event
+     * @param int $courseid the course id
+     * @return bool returns true if the event has subscriptions in a given course, false otherwise.
+     */
+    public static function event_has_subscriptions($eventname, $courseid) {
+        global $DB;
+
+        // Check if we can return these from cache.
+        $cache = \cache::make('tool_monitor', 'eventsubscriptions');
+
+        // The SQL we will be using to fill the cache if it is empty.
+        $sql = "SELECT DISTINCT(r.eventname)
+                  FROM {tool_monitor_subscriptions} s
+            INNER JOIN {tool_monitor_rules} r
+                    ON s.ruleid = r.id
+                 WHERE s.courseid = :courseid";
+
+        $sitesubscriptions = $cache->get(0);
+        // If we do not have the site subscriptions in the cache then return them from the DB.
+        if ($sitesubscriptions === false) {
+            // Set the array for the cache.
+            $sitesubscriptions = array();
+            if ($subscriptions = $DB->get_records_sql($sql, array('courseid' => 0))) {
+                foreach ($subscriptions as $subscription) {
+                    $sitesubscriptions[$subscription->eventname] = true;
+                }
+            }
+            $cache->set(0, $sitesubscriptions);
+        }
+
+        // Check if a subscription exists for this event site wide.
+        if (isset($sitesubscriptions[$eventname])) {
+            return true;
+        }
+
+        // If the course id is for the site, and we reached here then there is no site wide subscription for this event.
+        if (empty($courseid)) {
+            return false;
+        }
+
+        $coursesubscriptions = $cache->get($courseid);
+        // If we do not have the course subscriptions in the cache then return them from the DB.
+        if ($coursesubscriptions === false) {
+            // Set the array for the cache.
+            $coursesubscriptions = array();
+            if ($subscriptions = $DB->get_records_sql($sql, array('courseid' => $courseid))) {
+                foreach ($subscriptions as $subscription) {
+                    $coursesubscriptions[$subscription->eventname] = true;
+                }
+            }
+            $cache->set($courseid, $coursesubscriptions);
+        }
+
+        // Check if a subscription exists for this event in this course.
+        if (isset($coursesubscriptions[$eventname])) {
+            return true;
+        }
+
+        return false;
+    }
 }

admin/tool/monitor/db/caches.php

@@ -0,0 +1,35 @@
+<?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/>.
+
+/**
+ * Event monitor cache definitions.
+ *
+ * @package    tool_monitor
+ * @copyright  2014 Mark Nelson <markn@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die;
+
+$definitions = array(
+    'eventsubscriptions' => array(
+        'mode' => cache_store::MODE_APPLICATION,
+        'simplekeys' => true,
+        'simpledata' => true,
+        'staticacceleration' => true,
+        'staticaccelerationsize' => 10
+    )
+);

admin/tool/monitor/lang/en/tool_monitor.php

@@ -29,6 +29,7 @@
 $string['allmodules'] = 'All instances';
 $string['area'] = 'Area';
 $string['areatomonitor'] = 'Area to monitor';
+$string['cachedef_rules'] = 'This stores the list of event subscriptions for individual courses';
 $string['contactadmin'] = 'Contact your administrator to enable it.';
 $string['core'] = 'Core';
 $string['currentsubscriptions'] = 'Your current subscriptions';
@@ -98,4 +99,3 @@
 $string['subscribeto'] = 'Subscribe to rule "{$a}"';
 $string['taskcleanevents'] = 'Removes any unnecessary event monitor events';
 $string['unsubscribe'] = 'Unsubscribe';
-

admin/tool/monitor/version.php

@@ -26,6 +26,6 @@
 
 defined('MOODLE_INTERNAL') || die;
 
-$plugin->version   = 2014111000;       // The current plugin version (Date: YYYYMMDDXX).
-$plugin->requires  = 2014110400;       // Requires this Moodle version.
+$plugin->version   = 2014111001;     // The current plugin version (Date: YYYYMMDDXX).
+$plugin->requires  = 2014110400;     // Requires this Moodle version.
 $plugin->component = 'tool_monitor'; // Full name of the plugin (used for diagnostics).