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Classes

  • CakeEvent
  • CakeEventManager

Interfaces

  • CakeEventListener
  1: <?php
  2: /**
  3:  *
  4:  * PHP 5
  5:  *
  6:  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
  7:  * Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
  8:  *
  9:  * Licensed under The MIT License
 10:  * Redistributions of files must retain the above copyright notice.
 11:  *
 12:  * @copyright     Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
 13:  * @link          http://cakephp.org CakePHP(tm) Project
 14:  * @package       Cake.Event
 15:  * @since         CakePHP(tm) v 2.1
 16:  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 17:  */
 18: 
 19: App::uses('CakeEventListener', 'Event');
 20: 
 21: /**
 22:  * The event manager is responsible for keeping track of event listeners and pass the correct
 23:  * data to them, and fire them in the correct order, when associated events are triggered. You
 24:  * can create multiple instances of this objects to manage local events or keep a single instance
 25:  * and pass it around to manage all events in your app.
 26:  *
 27:  * @package Cake.Event
 28:  */
 29: class CakeEventManager {
 30: 
 31: /**
 32:  * The default priority queue value for new attached listeners
 33:  *
 34:  * @var int
 35:  */
 36:     public static $defaultPriority = 10;
 37: 
 38: /**
 39:  * The globally available instance, used for dispatching events attached from any scope
 40:  *
 41:  * @var CakeEventManager
 42:  */
 43:     protected static $_generalManager = null;
 44: 
 45: /**
 46:  * List of listener callbacks associated to
 47:  *
 48:  * @var object $Listeners
 49:  */
 50:     protected $_listeners = array();
 51: 
 52: /**
 53:  * Internal flag to distinguish a common manager from the sigleton
 54:  *
 55:  * @var boolean
 56:  */
 57:     protected $_isGlobal = false;
 58: 
 59: /**
 60:  * Returns the globally available instance of a CakeEventManager
 61:  * this is used for dispatching events attached from outside the scope
 62:  * other managers were created. Usually for creating hook systems or inter-class
 63:  * communication
 64:  *
 65:  * If called with a first params, it will be set as the globally available instance
 66:  *
 67:  * @param CakeEventManager $manager
 68:  * @return CakeEventManager the global event manager
 69:  */
 70:     public static function instance($manager = null) {
 71:         if ($manager instanceof CakeEventManager) {
 72:             self::$_generalManager = $manager;
 73:         }
 74:         if (empty(self::$_generalManager)) {
 75:             self::$_generalManager = new CakeEventManager;
 76:         }
 77: 
 78:         self::$_generalManager->_isGlobal = true;
 79:         return self::$_generalManager;
 80:     }
 81: 
 82: /**
 83:  * Adds a new listener to an event. Listeners
 84:  *
 85:  * @param callback|CakeEventListener $callable PHP valid callback type or instance of CakeEventListener to be called
 86:  * when the event named with $eventKey is triggered. If a CakeEventListener instances is passed, then the `implementedEvents`
 87:  * method will be called on the object to register the declared events individually as methods to be managed by this class.
 88:  * It is possible to define multiple event handlers per event name.
 89:  *
 90:  * @param string $eventKey The event unique identifier name to with the callback will be associated. If $callable
 91:  * is an instance of CakeEventListener this argument will be ignored
 92:  *
 93:  * @param array $options used to set the `priority` and `passParams` flags to the listener.
 94:  * Priorities are handled like queues, and multiple attachments into the same priority queue will be treated in
 95:  * the order of insertion. `passParams` means that the event data property will be converted to function arguments
 96:  * when the listener is called. If $called is an instance of CakeEventListener, this parameter will be ignored
 97:  *
 98:  * @return void
 99:  * @throws InvalidArgumentException When event key is missing or callable is not an
100:  *   instance of CakeEventListener.
101:  */
102:     public function attach($callable, $eventKey = null, $options = array()) {
103:         if (!$eventKey && !($callable instanceof CakeEventListener)) {
104:             throw new InvalidArgumentException(__d('cake_dev', 'The eventKey variable is required'));
105:         }
106:         if ($callable instanceof CakeEventListener) {
107:             $this->_attachSubscriber($callable);
108:             return;
109:         }
110:         $options = $options + array('priority' => self::$defaultPriority, 'passParams' => false);
111:         $this->_listeners[$eventKey][$options['priority']][] = array(
112:             'callable' => $callable,
113:             'passParams' => $options['passParams'],
114:         );
115:     }
116: 
117: /**
118:  * Auxiliary function to attach all implemented callbacks of a CakeEventListener class instance
119:  * as individual methods on this manager
120:  *
121:  * @param CakeEventListener $subscriber
122:  * @return void
123:  */
124:     protected function _attachSubscriber(CakeEventListener $subscriber) {
125:         foreach ($subscriber->implementedEvents() as $eventKey => $function) {
126:             $options = array();
127:             $method = $function;
128:             if (is_array($function) && isset($function['callable'])) {
129:                 list($method, $options) = $this->_extractCallable($function, $subscriber);
130:             } elseif (is_array($function) && is_numeric(key($function))) {
131:                 foreach ($function as $f) {
132:                     list($method, $options) = $this->_extractCallable($f, $subscriber);
133:                     $this->attach($method, $eventKey, $options);
134:                 }
135:                 continue;
136:             }
137:             if (is_string($method)) {
138:                 $method = array($subscriber, $function);
139:             }
140:             $this->attach($method, $eventKey, $options);
141:         }
142:     }
143: 
144: /**
145:  * Auxiliary function to extract and return a PHP callback type out of the callable definition
146:  * from the return value of the `implementedEvents` method on a CakeEventListener
147:  *
148:  * @param array $function the array taken from a handler definition for a event
149:  * @param CakeEventListener $object The handler object
150:  * @return callback
151:  */
152:     protected function _extractCallable($function, $object) {
153:         $method = $function['callable'];
154:         $options = $function;
155:         unset($options['callable']);
156:         if (is_string($method)) {
157:             $method = array($object, $method);
158:         }
159:         return array($method, $options);
160:     }
161: 
162: /**
163:  * Removes a listener from the active listeners.
164:  *
165:  * @param callback|CakeEventListener $callable any valid PHP callback type or an instance of CakeEventListener
166:  * @return void
167:  */
168:     public function detach($callable, $eventKey = null) {
169:         if ($callable instanceof CakeEventListener) {
170:             return $this->_detachSubscriber($callable, $eventKey);
171:         }
172:         if (empty($eventKey)) {
173:             foreach (array_keys($this->_listeners) as $eventKey) {
174:                 $this->detach($callable, $eventKey);
175:             }
176:             return;
177:         }
178:         if (empty($this->_listeners[$eventKey])) {
179:             return;
180:         }
181:         foreach ($this->_listeners[$eventKey] as $priority => $callables) {
182:             foreach ($callables as $k => $callback) {
183:                 if ($callback['callable'] === $callable) {
184:                     unset($this->_listeners[$eventKey][$priority][$k]);
185:                     break;
186:                 }
187:             }
188:         }
189:     }
190: 
191: /**
192:  * Auxiliary function to help detach all listeners provided by an object implementing CakeEventListener
193:  *
194:  * @param CakeEventListener $subscriber the subscriber to be detached
195:  * @param string $eventKey optional event key name to unsubscribe the listener from
196:  * @return void
197:  */
198:     protected function _detachSubscriber(CakeEventListener $subscriber, $eventKey = null) {
199:         $events = $subscriber->implementedEvents();
200:         if (!empty($eventKey) && empty($events[$eventKey])) {
201:             return;
202:         } elseif (!empty($eventKey)) {
203:             $events = array($eventKey => $events[$eventKey]);
204:         }
205:         foreach ($events as $key => $function) {
206:             if (is_array($function)) {
207:                 if (is_numeric(key($function))) {
208:                     foreach ($function as $handler) {
209:                         $handler = isset($handler['callable']) ? $handler['callable'] : $handler;
210:                         $this->detach(array($subscriber, $handler), $key);
211:                     }
212:                     continue;
213:                 }
214:                 $function = $function['callable'];
215:             }
216:             $this->detach(array($subscriber, $function), $key);
217:         }
218:     }
219: 
220: /**
221:  * Dispatches a new event to all configured listeners
222:  *
223:  * @param string|CakeEvent $event the event key name or instance of CakeEvent
224:  * @return void
225:  */
226:     public function dispatch($event) {
227:         if (is_string($event)) {
228:             $event = new CakeEvent($event);
229:         }
230: 
231:         if (!$this->_isGlobal) {
232:             self::instance()->dispatch($event);
233:         }
234: 
235:         if (empty($this->_listeners[$event->name()])) {
236:             return;
237:         }
238: 
239:         foreach ($this->listeners($event->name()) as $listener) {
240:             if ($event->isStopped()) {
241:                 break;
242:             }
243:             if ($listener['passParams'] === true) {
244:                 $result = call_user_func_array($listener['callable'], $event->data);
245:             } else {
246:                 $result = call_user_func($listener['callable'], $event);
247:             }
248:             if ($result === false) {
249:                 $event->stopPropagation();
250:             }
251:             if ($result !== null) {
252:                 $event->result = $result;
253:             }
254:             continue;
255:         }
256:     }
257: 
258: /**
259:  * Returns a list of all listeners for a eventKey in the order they should be called
260:  *
261:  * @param string $eventKey
262:  * @return array
263:  */
264:     public function listeners($eventKey) {
265:         if (empty($this->_listeners[$eventKey])) {
266:             return array();
267:         }
268:         ksort($this->_listeners[$eventKey]);
269:         $result = array();
270:         foreach ($this->_listeners[$eventKey] as $priorityQ) {
271:             $result = array_merge($result, $priorityQ);
272:         }
273:         return $result;
274:     }
275: 
276: }
277: 
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