ilAppEventHandler Class Reference

Global event handler. More...

Collaboration diagram for ilAppEventHandler:

Public Member Functions
	__construct ()
	Constructor. More...
	raise ($a_component, $a_event, $a_parameter="")
	Raise an event. More...

Protected Member Functions
	initListeners ()

Protected Attributes
	$listener

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

Version

$Id$

Definition at line 58 of file class.ilAppEventHandler.php.

Constructor & Destructor Documentation

__construct()

ilAppEventHandler::__construct

(

)

Constructor.

Definition at line 65 of file class.ilAppEventHandler.php.

        {
                $this->initListeners();
        }

References initListeners().

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Member Function Documentation

initListeners()

ilAppEventHandler::initListeners ( )

protected

Definition at line 70 of file class.ilAppEventHandler.php.

        {
                require_once('./Services/GlobalCache/classes/class.ilGlobalCache.php');
                $ilGlobalCache = ilGlobalCache::getInstance(ilGlobalCache::COMP_EVENTS);
                $cached_listeners = $ilGlobalCache->get('listeners');
                if (is_array($cached_listeners)) {
                        $this->listener = $cached_listeners;
 
                        return;
                }
 
                global $ilDB;
 
                $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);
        }

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

Referenced by __construct().

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raise()

ilAppEventHandler::raise	(		$a_component,
			$a_event,
			$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 105 of file class.ilAppEventHandler.php.

        {
                if (is_array($this->listener[$a_component]))
                {
                        foreach ($this->listener[$a_component] as $listener)
                        {
                                // Allow listeners like Services/WebServices/ECS
                                $last_slash = strripos($listener,'/');
                                $comp = substr($listener,0,$last_slash);
                                $class = 'il'.substr($listener,$last_slash + 1).'AppEventListener';
                                $file = "./".$listener."/classes/class.".$class.".php";
                                
                                // detemine class and file
                                #$comp = explode("/", $listener);
                                #$class = "il".$comp[1]."AppEventListener";
                                #$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);
                                }
                        }
                }
 
                // get all event hook plugins and forward the event to them
                include_once("./Services/Component/classes/class.ilPluginAdmin.php");
                $plugins = ilPluginAdmin::getActivePluginsForSlot("Services", "EventHandling", "evhk");
                foreach ($plugins as $pl)
                {
                        $plugin = ilPluginAdmin::getPluginObject("Services", "EventHandling",
                                "evhk", $pl);
                        $plugin->handleEvent($a_component, $a_event, $a_parameter);     
                }
 
                $workflow_engine = new ilWorkflowEngine(false);
                $workflow_engine->handleEvent($a_component, $a_event, $a_parameter);
        }

References $file, $listener, ilPluginAdmin\getActivePluginsForSlot(), and ilPluginAdmin\getPluginObject().

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Field Documentation

$listener

ilAppEventHandler::$listener

protected

Definition at line 60 of file class.ilAppEventHandler.php.

Referenced by raise().

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The documentation for this class was generated from the following file:

• Services/EventHandling/classes/class.ilAppEventHandler.php