Global event handler. More...

Collaboration diagram for ilAppEventHandler:

Public Member Functions
	__construct ()

	raise (string $a_component, string $a_event, array $a_parameter=[])
	Raise an event. More...

Protected Member Functions
	initListeners ()

Protected Attributes
ilDBInterface	$db

array	$listener

ilLogger	$logger

ilComponentRepository	$component_repository

ilComponentFactory	$component_factory

Detailed Description

Global event handler.

The event handler delegates application events (not gui events) between components that trigger events and components that listen to events. A component is a module or a service.

The component that triggers an event calls the raise function of the event handler through the global instance ilAppEventHandler:

E.g. in ilObjUser->delete(): $ilAppEventHandler->raise("Services/User", "deleteUser", array("id" => ..., ...))

A listener has to subscribe to the events of another component. This currently is done here in the constructor, e.g. if the News service listens to the User service, add a $this->listener["Services/User"] = array("Services/News"); This information will go to xml files in the future.

A component has to implement a listener class that implements Services/EventHandling/interfaces/interface.ilAppEventListener.php

The location must be <component>/classes/class.il<comp_name>AppEventListener.php, e.g. ./Services/News/classes/class.ilNewsAppEventListener.php

The class name must be il<comp_name>AppEventListener.

Author: Alex Killing alex..nosp@m.kill.nosp@m.ing@g.nosp@m.mx.d.nosp@m.e; Fabian Schmid fs@st.nosp@m.uder.nosp@m.-raim.nosp@m.ann..nosp@m.ch

Definition at line 51 of file class.ilAppEventHandler.php.

Constructor & Destructor Documentation

◆ __construct()

ilAppEventHandler::__construct ( )

Definition at line 59 of file class.ilAppEventHandler.php.

References $DIC, ilLoggerFactory\getLogger(), initListeners(), and ILIAS\Repository\logger().

     {
         global $DIC;
 
         $this->db = $DIC->database();
         $this->component_repository = $DIC["component.repository"];
         $this->component_factory = $DIC["component.factory"];
         $this->initListeners();
 
         $this->logger = \ilLoggerFactory::getLogger('evnt');
     }

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Member Function Documentation

◆ initListeners()

ilAppEventHandler::initListeners ( )

protected

Definition at line 71 of file class.ilAppEventHandler.php.

References $db, $ilDB, $res, ilGlobalCache\COMP_EVENTS, and ilGlobalCache\getInstance().

Referenced by __construct().

                                       : void
     {
         $ilGlobalCache = ilGlobalCache::getInstance(ilGlobalCache::COMP_EVENTS);
         $cached_listeners = $ilGlobalCache->get('listeners');
         if (is_array($cached_listeners)) {
             $this->listener = $cached_listeners;
 
             return;
         }
 
         $ilDB = $this->db;
 
         $this->listener = array();
 
         $sql = "SELECT * FROM il_event_handling" .
             " WHERE type = " . $ilDB->quote("listen", "text");
         $res = $ilDB->query($sql);
         while ($row = $ilDB->fetchAssoc($res)) {
             $this->listener[$row["id"]][] = $row["component"];
         }
 
         $ilGlobalCache->set('listeners', $this->listener);
     }

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◆ raise()

ilAppEventHandler::raise	(	string	$a_component,
		string	$a_event,
		array	$a_parameter = `[]`
	)

Raise an event.

The event is passed to all interested listeners.

Parameters

string	$a_component	component, e.g. "Modules/Forum" or "Services/User"
string	$a_event	event e.g. "createUser", "updateUser", "deleteUser", ...
array	$a_parameter	parameter array (assoc), array("name" => ..., "phone_office" => ...)

Definition at line 102 of file class.ilAppEventHandler.php.

References $name, XapiProxy\$plugin, and ILIAS\Repository\logger().

Referenced by ilObjOrgUnit\assignUsersToEmployeeRole(), ilObjOrgUnit\assignUsersToSuperiorRole(), ilObjOrgUnit\assignUserToLocalRole(), ilObjMediaObject\create(), ilObjOrgUnit\deassignUserFromEmployeeRole(), ilObjOrgUnit\deassignUserFromLocalRole(), ilObjOrgUnit\deassignUserFromSuperiorRole(), ilObjOrgUnit\delete(), ilAuthFrontend\handleAuthenticationSuccess(), and ilObjMediaObject\update().

      : void {
         $this->logger->debug(sprintf(
             "Received event '%s' from component '%s'.",
             $a_event,
             $a_component
         ));
 
         $parameter_formatter = static function ($value) use (&$parameter_formatter) {
             if (is_object($value)) {
                 return get_class($value);
             }
 
             if (is_array($value)) {
                 return array_map(
                     $parameter_formatter,
                     $value
                 );
             }
 
             return $value;
         };
 
         $this->logger->debug('Event data: ' . var_export(array_map(
             $parameter_formatter,
             $a_parameter
         ), true));
 
         $this->logger->debug("Started event propagation for event listeners ...");
 
         if (is_array($this->listener[$a_component] ?? null)) {
             foreach ($this->listener[$a_component] as $listener) {
                 // Allow listeners like Services/WebServices/ECS
                 $last_slash = strripos($listener, '/');
                 $comp = substr($listener, 0, $last_slash);
 
                 // any kind of plugins with events in their plugin.xml
                 if ($comp == 'Plugins') {
                     $name = substr($listener, $last_slash + 1);
 
 
                     foreach ($this->component_repository->getPlugins() as $pl) {
                         if ($pl->getName() !== $name || !$pl->isActive()) {
                             continue;
                         }
                         $plugin = $this->component_factory->getPlugin($pl->getId());
                         $plugin->handleEvent($a_component, $a_event, $a_parameter);
                     }
                 } else {
                     $class = 'il' . substr($listener, $last_slash + 1) . 'AppEventListener';
                     $file = "./" . $listener . "/classes/class." . $class . ".php";
                     // if file exists, call listener
                     if (is_file($file)) {
                         include_once($file);
                         call_user_func(array($class, 'handleEvent'), $a_component, $a_event, $a_parameter);
                     }
                 }
             }
         }
 
         $this->logger->debug("Finished event listener handling, started event propagation for event hook plugins ...");
 
         // get all event hook plugins and forward the event to them
         foreach ($this->component_factory->getActivePluginsInSlot("evhk") as $plugin) {
             $plugin->handleEvent($a_component, $a_event, $a_parameter);
         }
     }