115 lines
2.5 KiB
PHP
115 lines
2.5 KiB
PHP
<?PHP
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/**
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* example that shows how to create event bubbling
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*
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* This allows you to create several levels of event handling and you
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* may post a notification to any of these levels.
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*
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* After a notification has been posted on a lower level, it will bubble
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* up through all other levels.
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*
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* @package Event_Dispatcher
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* @subpackage Examples
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* @author Stephan Schmidt <schst@php.net>
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*/
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/**
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* load Event_Dispatcher package
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*/
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require_once 'Event/Dispatcher.php';
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/**
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* example sender class
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*/
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class sender
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{
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var $_dispatcher = null;
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function sender(&$dispatcher)
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{
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$this->_dispatcher = &$dispatcher;
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}
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function foo($bubble = true)
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{
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$this->_dispatcher->post($this, 'onFoo', 'Some Info...', true, $bubble);
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}
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}
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/**
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* example observer
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*/
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function receiver1(&$notification)
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{
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echo "receiver 1 received notification<br />\n";
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}
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/**
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* example observer
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*/
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function receiver2(&$notification)
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{
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echo "receiver 2 received notification<br />\n";
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}
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/**
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* example observer
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*/
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function receiver3(&$notification)
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{
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echo "receiver 3 received notification<br />\n";
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}
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// get the different dispatchers
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$dispatcher1 = &Event_Dispatcher::getInstance();
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$dispatcher2 = &Event_Dispatcher::getInstance('child');
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$dispatcher3 = &Event_Dispatcher::getInstance('grandchild');
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// create senders in two different levels
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$sender1 = &new sender($dispatcher1);
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$sender2 = &new sender($dispatcher2);
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// build three levels
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$dispatcher1->addNestedDispatcher($dispatcher2);
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$dispatcher2->addNestedDispatcher($dispatcher3);
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// add observers in level one and two
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$dispatcher1->addObserver('receiver1', 'onFoo');
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$dispatcher2->addObserver('receiver2', 'onFoo');
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// this will bubble up from 1 to 3
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echo 'sender1->foo()<br />';
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$sender1->foo();
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// this will not bubble up
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echo '<br />';
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echo 'sender1->foo(), but disable bubbling<br />';
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$sender1->foo(false);
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// this will bubble up from 2 to 3
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echo '<br />';
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echo 'sender2->foo()<br />';
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$sender2->foo();
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// This observer will receive the two pending notifications on level 3
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echo '<br />';
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echo 'dispatcher3->addObserver()<br />';
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$dispatcher3->addObserver('receiver3', 'onFoo');
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// remove one level
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$success = $dispatcher1->removeNestedDispatcher($dispatcher2);
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if ($success === true) {
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echo '<br />';
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echo 'removed nested dispatcher2 from dispatcher1<br />';
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}
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// this will stay in level 1
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echo 'sender1->foo()<br />';
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$sender1->foo();
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// this will bubble up from 2-3
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echo '<br />';
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echo 'sender2->foo()<br />';
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$sender2->foo();
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?>
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