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Event dispatcher

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A minimalistic event dispatcher (observer) interface that was part of the Semantic MediaWiki code base and is now being deployed as independent library.


PHP 5.3/HHVM 3.3 or later


The recommended installation method for this library is by either adding the dependency to your composer.json

```json { "require": { "onoi/event-dispatcher": "~1.0" } } `` or to executecomposer require onoi/event-dispatcher:~1.0`.


```php class BarListener implements EventListener {

public function execute( DispatchContext $dispatchContext = null ) {
    // Do something

public function isPropagationStopped() {
    return false;

} php class ListenerCollectionRegistery implements EventListenerCollection {

private $eventListenerCollection;

public function __construct( EventListenerCollection $eventListenerCollection ) {
    $this->eventListenerCollection = $eventListenerCollection;

public function getCollection() {
    return $this->addToListenerCollection()->getCollection();

private function addToListenerCollection() {

    $this->eventListenerCollection->registerCallback( 'do.something', function() {
        // Do something
    } );

    $this->eventListenerCollection->registerListener( '', new BarListener() );

    return $this->eventListenerCollection;

} php $eventDispatcherFactory = new EventDispatcherFactory();

$listenerCollectionRegistery = new ListenerCollectionRegistery( $eventDispatcherFactory->newGenericEventListenerCollection() );

$eventDispatcher = $eventDispatcherFactory->newGenericEventDispatcher(); $eventDispatcher->addListenerCollection( $listenerCollectionRegistery );

class Foo {

public function __construct( EventDispatcher $eventDispatcher ) {
    $this->eventDispatcher = $eventDispatcher;

public function doSomething() {
    $this->eventDispatcher->dispatch( 'do.something' );

    $dispatchContext = new DispatchContext();
    $dispatchContext->set( 'dosomethingelse', new \stdClass );

    $this->eventDispatcher->dispatch( '', $dispatchContext );


$instance = new Foo( $eventDispatcher ); $instance->doSomething(); ```

Contribution and support

If you want to contribute work to the project please subscribe to the developers mailing list and have a look at the / "contribution guidelinee". A list of people who have made contributions in the past can be found here.


The library provides unit tests that covers the core-functionality normally run by the continues integration platform. Tests can also be executed manually using the PHPUnit configuration file found in the root directory.

Release notes

  • 1.0.0 initial release (2015-03-25)


GNU General Public License 2.0 or later.