Event::_propagate() - Code Metrics - Inspection of "+ Support for attaching events to interfaces" - Maslosoft/Mangan - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — string-event-subscriptions ( e8cd90 )

by Peter

created 2016-05-20 14:54 UTC

Event::_propagate() C

↳ Parent: Event

Complexity

Conditions	8
Paths	7

Size

Total Lines	32
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	32
rs	5.3846
cc	8
eloc	16
nc	7
nop	3

<?php

/**
 * This software package is licensed under AGPL or Commercial license.
 *
 * @package maslosoft/mangan
 * @licence AGPL or Commercial
 * @copyright Copyright (c) Piotr Masełkowski <[email protected]>
 * @copyright Copyright (c) Maslosoft
 * @copyright Copyright (c) Others as mentioned in code
 * @link http://maslosoft.com/mangan/
 */

namespace Maslosoft\Mangan\Events;

use Maslosoft\Addendum\Interfaces\AnnotatedInterface;
use Maslosoft\Addendum\Utilities\ClassChecker;
use Maslosoft\Mangan\Interfaces\Events\EventInterface;
use Maslosoft\Mangan\Meta\ManganMeta;
use ReflectionClass;
use UnexpectedValueException;

/**
 * This is based on Yii 2 Events
 */
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * Event is the base class for all event classes.
 *
 * It encapsulates the parameters associated with an event.
 * The [[sender]] property describes who raises the event.
 * And the [[handled]] property indicates if the event is handled.
 * If an event handler sets [[handled]] to be true, the rest of the
 * uninvoked handlers will no longer be called to handle the event.
 *
 * Additionally, when attaching an event handler, extra data may be passed
 * and be available via the [[data]] property when the event handler is invoked.
 *
 * @author Qiang Xue <[email protected]>
 * @since 2.0
 */
class Event implements EventInterface
{

	/**
	 * @var string the event name. This property is set by [[Component::trigger()]] and [[trigger()]].
	 * Event handlers may use this property to check what event it is handling.
	 */
	public $name;

	/**
	 * @var object the sender of this event. If not set, this property will be
	 * set as the object whose "trigger()" method is called.
	 * This property may also be a `null` when this event is a
	 * class-level event which is triggered in a static context.
	 */
	public $sender;

	/**
	 * @var boolean whether the event is handled. Defaults to false.
	 * When a handler sets this to be true, the event processing will stop and
	 * ignore the rest of the uninvoked event handlers.
	 */
	public $handled = false;

	/**
	 * @var mixed the data that is passed to [[Component::on()]] when attaching an event handler.
	 * Note that this varies according to which event handler is currently executing.
	 */
	public $data;

	/**
	 * Array of events
	 * @var EventInterface[]
	 */
	private static $_events = [];

	/**
	 * Attaches an event handler to a class-level event.
	 *
	 * When a class-level event is triggered, event handlers attached
	 * to that class and all parent classes will be invoked.
	 *
	 * For example, the following code attaches an event handler to document's
	 * `afterInsert` event:
	 *
	 * ~~~
	 * Event::on($model, EntityManager::EventAfterInsert, function ($event) {
	 * 		var_dump(get_class($event->sender) . ' is inserted.');
	 * });
	 * ~~~
	 *
	 * The handler will be invoked for every successful document insertion.
	 *
	 * **NOTE:** Each call will attach new event handler. When placing event
	 * initialization in class constructors etc. ensure that it is evaluated once,
	 * or it might trigger same event handler multiple times.
	 *
	 * @param AnnotatedInterface|string $model the object specifying the class-level event.
	 * @param string $name the event name.
	 * @param callable $handler the event handler.
	 * @param mixed $data the data to be passed to the event handler when the event is triggered.
	 * When the event handler is invoked, this data can be accessed via [[Event::data]].
	 * @param boolean $append whether to append new event handler to the end of the existing
	 * handler list. If false, the new handler will be inserted at the beginning of the existing
	 * handler list.
	 * @see off()
	 */
	public static function on($model, $name, $handler, $data = null, $append = true)
	{
		$class = self::_getName($model);
		if ($append || empty(self::$_events[$name][$class]))
		{
			self::$_events[$name][$class][] = [$handler, $data];
		}
		else
		{
			array_unshift(self::$_events[$name][$class], [$handler, $data]);
		}
	}

	/**
	 * Detaches an event handler from a class-level event.
	 *
	 * This method is the opposite of [[on()]].
	 *
	 * @param AnnotatedInterface|string $model the object specifying the class-level event.
	 * @param string $name the event name.
	 * @param callable $handler the event handler to be removed.
	 * If it is null, all handlers attached to the named event will be removed.
	 * @return boolean whether a handler is found and detached.
	 * @see on()
	 */
	public static function off($model, $name, $handler = null)
	{
		$class = self::_getName($model);
		if (empty(self::$_events[$name][$class]))
		{
			return false;
		}
		if ($handler === null)
		{
			unset(self::$_events[$name][$class]);
			return true;
		}
		else
		{
			$removed = false;
			foreach (self::$_events[$name][$class] as $i => $event)
			{
				if ($event[0] === $handler)
				{
					unset(self::$_events[$name][$class][$i]);
					$removed = true;
				}
			}
			if ($removed)
			{
				self::$_events[$name][$class] = array_values(self::$_events[$name][$class]);
			}
			return $removed;
		}
	}

	/**
	 * Triggers a class-level event.
	 * This method will cause invocation of event handlers that are attached to the named event
	 * for the specified class and all its parent classes.
	 * @param AnnotatedInterface $model the object specifying the class-level event.
	 * @param string $name the event name.
	 * @param ModelEvent $event the event parameter. If not set, a default [[Event]] object will be created.
	 * @return bool True if event was triggered.
	 */
	public static function trigger(AnnotatedInterface $model, $name, &$event = null)
	{
		$wasTriggered = false;
		if (empty(self::$_events[$name]))
		{
			return self::_propagate($model, $name, $event);
		}
		if ($event === null)
		{
			$event = new ModelEvent();
		}
		$event->handled = false;
		$event->name = $name;

		if ($event->sender === null)
		{
			$event->sender = $model;
		}
		$className = self::_getName($model);

		// Partials holds parts of class, this include interfaces and traits
		$partials = [];
		// Iterate over traits
		foreach ((new ReflectionClass($className))->getTraitNames() as $trait)
		{
			$partials[] = $trait;
		}

		// Iterate over interfaces to get partials
		foreach ((new ReflectionClass($className))->getInterfaceNames() as $interface)
		{
			$partials[] = $interface;
		}

		// Iterate over parent classes
		do
		{
			$partials[] = $className;
		}
		while (($className = get_parent_class($className)) !== false);

		// Trigger all partial events if applicable
		foreach ($partials as $className)
		{
			if (empty(self::$_events[$name][$className]))
			{
				continue;
			}

			foreach (self::$_events[$name][$className] as $handler)
			{
				$event->data = $handler[1];
				call_user_func($handler[0], $event);
				$wasTriggered = true;

				// Event was handled, return true
				if ($event->handled)
				{
					return true;
				}
			}
		}

		// Propagate events to sub objects
		return self::_propagate($model, $name, $event) || $wasTriggered;
	}

	/**
	 * Triggers a class-level event and checks if it's valid.
	 * If don't have event handler returns true. If event handler is set, return true if `Event::isValid`.
	 * This method will cause invocation of event handlers that are attached to the named event
	 * for the specified class and all its parent classes.
	 * @param AnnotatedInterface $model the object specifying the class-level event.
	 * @param string $name the event name.
	 * @param ModelEvent $event the event parameter. If not set, a default [[ModelEvent]] object will be created.
	 * @return bool True if event was triggered and is valid.
	 */
	public static function valid(AnnotatedInterface $model, $name, $event = null)
	{
		if (Event::trigger($model, $name, $event))
		{
			return $event->isValid;
		}
		else
		{
			return true;
		}
	}

	/**
	 * Triggers a class-level event and checks if it's handled.
	 * If don't have event handler returns true. If event handler is set, return true if `Event::handled`.
	 * This method will cause invocation of event handlers that are attached to the named event
	 * for the specified class and all its parent classes.
	 * @param AnnotatedInterface $model the object specifying the class-level event.
	 * @param string $name the event name.
	 * @param ModelEvent $event the event parameter. If not set, a default [[Event]] object will be created.
	 * @return bool|null True if handled, false otherway, null if not triggered
	 */
	public static function handled(AnnotatedInterface $model, $name, $event = null)
	{
		if (Event::trigger($model, $name, $event))
		{
			return $event->handled;
		}
		return true;
	}

	/**
	 * Check if model has event handler.
	 * **IMPORTANT**: It does not check for propagated events
	 * 
	 * @param AnnotatedInterface|string $class the object specifying the class-level event
	 * @param string $name the event name.
	 * @return bool True if has handler
	 */
	public static function hasHandler($class, $name)
	{
		$className = self::_getName($class);

		do
		{
			if (!empty(self::$_events[$name][$className]))
			{
				return true;
			}
		}
		while (($className = get_parent_class($className)) !== false);
		return false;
	}

	/**
	 * Get class name
	 * @param AnnotatedInterface|string $class
	 * @return string
	 */
	private static function _getName($class)
	{
		if (is_object($class))
		{
			$class = get_class($class);
		}
		else
		{
			if (!ClassChecker::exists($class))
			{
				throw new UnexpectedValueException(sprintf("Class `%s` not found", $class));
			}
		}
		return ltrim($class, '\\');
	}

	/**
	 * Propagate event
	 * @param AnnotatedInterface $model
	 * @param string $name
	 * @param ModelEvent|null $event
	 */
	private static function _propagate(AnnotatedInterface $model, $name, &$event = null)
	{
		$wasTriggered = false;
		if ($event && !$event->propagate())
		{
			return false;
		}
		$meta = ManganMeta::create($model);
		foreach ($meta->properties('propagateEvents') as $property => $propagate)
		{
			if (!$propagate)
			{
				continue;
			}
			if (!$model->$property)
			{
				continue;
			}
			// Trigger for arrays
			if (is_array($model->$property))
			{
				foreach ($model->$property as $object)
				{
					$wasTriggered = self::trigger($object, $name, $event);
				}
				continue;
			}
			// Trigger for single value
			$wasTriggered = self::trigger($model->$property, $name, $event);
		}
		return $wasTriggered;
	}

}


1			<?php
2
3			/**
4			* This software package is licensed under AGPL or Commercial license.
5			*
6			* @package maslosoft/mangan
7			* @licence AGPL or Commercial
8			* @copyright Copyright (c) Piotr Masełkowski <[email protected]>
9			* @copyright Copyright (c) Maslosoft
10			* @copyright Copyright (c) Others as mentioned in code
11			* @link http://maslosoft.com/mangan/
12			*/
13
14			namespace Maslosoft\Mangan\Events;
15
16			use Maslosoft\Addendum\Interfaces\AnnotatedInterface;
17			use Maslosoft\Addendum\Utilities\ClassChecker;
18			use Maslosoft\Mangan\Interfaces\Events\EventInterface;
19			use Maslosoft\Mangan\Meta\ManganMeta;
20			use ReflectionClass;
21			use UnexpectedValueException;
22
23			/**
24			* This is based on Yii 2 Events
25			*/
26			/**
27			* @link http://www.yiiframework.com/
28			* @copyright Copyright (c) 2008 Yii Software LLC
29			* @license http://www.yiiframework.com/license/
30			*/
31
32			/**
33			* Event is the base class for all event classes.
34			*
35			* It encapsulates the parameters associated with an event.
36			* The [[sender]] property describes who raises the event.
37			* And the [[handled]] property indicates if the event is handled.
38			* If an event handler sets [[handled]] to be true, the rest of the
39			* uninvoked handlers will no longer be called to handle the event.
40			*
41			* Additionally, when attaching an event handler, extra data may be passed
42			* and be available via the [[data]] property when the event handler is invoked.
43			*
44			* @author Qiang Xue <[email protected]>
45			* @since 2.0
46			*/
47			class Event implements EventInterface
48			{
49
50			/**
51			* @var string the event name. This property is set by [[Component::trigger()]] and [[trigger()]].
52			* Event handlers may use this property to check what event it is handling.
53			*/
54			public $name;
55
56			/**
57			* @var object the sender of this event. If not set, this property will be
58			* set as the object whose "trigger()" method is called.
59			* This property may also be a `null` when this event is a
60			* class-level event which is triggered in a static context.
61			*/
62			public $sender;
63
64			/**
65			* @var boolean whether the event is handled. Defaults to false.
66			* When a handler sets this to be true, the event processing will stop and
67			* ignore the rest of the uninvoked event handlers.
68			*/
69			public $handled = false;
70
71			/**
72			* @var mixed the data that is passed to [[Component::on()]] when attaching an event handler.
73			* Note that this varies according to which event handler is currently executing.
74			*/
75			public $data;
76
77			/**
78			* Array of events
79			* @var EventInterface[]
80			*/
81			private static $_events = [];
82
83			/**
84			* Attaches an event handler to a class-level event.
85			*
86			* When a class-level event is triggered, event handlers attached
87			* to that class and all parent classes will be invoked.
88			*
89			* For example, the following code attaches an event handler to document's
90			* `afterInsert` event:
91			*
92			* ~~~
93			* Event::on($model, EntityManager::EventAfterInsert, function ($event) {
94			* var_dump(get_class($event->sender) . ' is inserted.');
95			* });
96			* ~~~
97			*
98			* The handler will be invoked for every successful document insertion.
99			*
100			* NOTE: Each call will attach new event handler. When placing event
101			* initialization in class constructors etc. ensure that it is evaluated once,
102			* or it might trigger same event handler multiple times.
103			*
104			* @param AnnotatedInterface\|string $model the object specifying the class-level event.
105			* @param string $name the event name.
106			* @param callable $handler the event handler.
107			* @param mixed $data the data to be passed to the event handler when the event is triggered.
108			* When the event handler is invoked, this data can be accessed via [[Event::data]].
109			* @param boolean $append whether to append new event handler to the end of the existing
110			* handler list. If false, the new handler will be inserted at the beginning of the existing
111			* handler list.
112			* @see off()
113			*/
114			public static function on($model, $name, $handler, $data = null, $append = true)
115			{
116			$class = self::_getName($model);
117			if ($append \|\| empty(self::$_events[$name][$class]))
118			{
119			self::$_events[$name][$class][] = [$handler, $data];
120			}
121			else
122			{
123			array_unshift(self::$_events[$name][$class], [$handler, $data]);
124			}
125			}
126
127			/**
128			* Detaches an event handler from a class-level event.
129			*
130			* This method is the opposite of [[on()]].
131			*
132			* @param AnnotatedInterface\|string $model the object specifying the class-level event.
133			* @param string $name the event name.
134			* @param callable $handler the event handler to be removed.
135			* If it is null, all handlers attached to the named event will be removed.
136			* @return boolean whether a handler is found and detached.
137			* @see on()
138			*/
139			public static function off($model, $name, $handler = null)
140			{
141			$class = self::_getName($model);
142			if (empty(self::$_events[$name][$class]))
143			{
144			return false;
145			}
146			if ($handler === null)
147			{
148			unset(self::$_events[$name][$class]);
149			return true;
150			}
151			else
152			{
153			$removed = false;
154			foreach (self::$_events[$name][$class] as $i => $event)
155			{
156			if ($event[0] === $handler)
157			{
158			unset(self::$_events[$name][$class][$i]);
159			$removed = true;
160			}
161			}
162			if ($removed)
163			{
164			self::$_events[$name][$class] = array_values(self::$_events[$name][$class]);
165			}
166			return $removed;
167			}
168			}
169
170			/**
171			* Triggers a class-level event.
172			* This method will cause invocation of event handlers that are attached to the named event
173			* for the specified class and all its parent classes.
174			* @param AnnotatedInterface $model the object specifying the class-level event.
175			* @param string $name the event name.
176			* @param ModelEvent $event the event parameter. If not set, a default [[Event]] object will be created.
177			* @return bool True if event was triggered.
178			*/
179			public static function trigger(AnnotatedInterface $model, $name, &$event = null)
180			{
181			$wasTriggered = false;
182			if (empty(self::$_events[$name]))
183			{
184			return self::_propagate($model, $name, $event);
185			}
186			if ($event === null)
187			{
188			$event = new ModelEvent();
189			}
190			$event->handled = false;
191			$event->name = $name;
192
193			if ($event->sender === null)
194			{
195			$event->sender = $model;
196			}
197			$className = self::_getName($model);
198
199			// Partials holds parts of class, this include interfaces and traits
200			$partials = [];
201			// Iterate over traits
202			foreach ((new ReflectionClass($className))->getTraitNames() as $trait)
203			{
204			$partials[] = $trait;
205			}
206
207			// Iterate over interfaces to get partials
208			foreach ((new ReflectionClass($className))->getInterfaceNames() as $interface)
209			{
210			$partials[] = $interface;
211			}
212
213			// Iterate over parent classes
214			do
215			{
216			$partials[] = $className;
217			}
218			while (($className = get_parent_class($className)) !== false);
219
220			// Trigger all partial events if applicable
221			foreach ($partials as $className)
222			{
223			if (empty(self::$_events[$name][$className]))
224			{
225			continue;
226			}
227
228			foreach (self::$_events[$name][$className] as $handler)
229			{
230			$event->data = $handler[1];
231			call_user_func($handler[0], $event);
232			$wasTriggered = true;
233
234			// Event was handled, return true
235			if ($event->handled)
236			{
237			return true;
238			}
239			}
240			}
241
242			// Propagate events to sub objects
243			return self::_propagate($model, $name, $event) \|\| $wasTriggered;
244			}
245
246			/**
247			* Triggers a class-level event and checks if it's valid.
248			* If don't have event handler returns true. If event handler is set, return true if `Event::isValid`.
249			* This method will cause invocation of event handlers that are attached to the named event
250			* for the specified class and all its parent classes.
251			* @param AnnotatedInterface $model the object specifying the class-level event.
252			* @param string $name the event name.
253			* @param ModelEvent $event the event parameter. If not set, a default [[ModelEvent]] object will be created.
254			* @return bool True if event was triggered and is valid.
255			*/
256			public static function valid(AnnotatedInterface $model, $name, $event = null)
257			{
258			if (Event::trigger($model, $name, $event))
259			{
260			return $event->isValid;
261			}
262			else
263			{
264			return true;
265			}
266			}
267
268			/**
269			* Triggers a class-level event and checks if it's handled.
270			* If don't have event handler returns true. If event handler is set, return true if `Event::handled`.
271			* This method will cause invocation of event handlers that are attached to the named event
272			* for the specified class and all its parent classes.
273			* @param AnnotatedInterface $model the object specifying the class-level event.
274			* @param string $name the event name.
275			* @param ModelEvent $event the event parameter. If not set, a default [[Event]] object will be created.
276			* @return bool\|null True if handled, false otherway, null if not triggered
277			*/
278			public static function handled(AnnotatedInterface $model, $name, $event = null)
279			{
280			if (Event::trigger($model, $name, $event))
281			{
282			return $event->handled;
283			}
284			return true;
285			}
286
287			/**
288			* Check if model has event handler.
289			* IMPORTANT: It does not check for propagated events
290			*
291			* @param AnnotatedInterface\|string $class the object specifying the class-level event
292			* @param string $name the event name.
293			* @return bool True if has handler
294			*/
295			public static function hasHandler($class, $name)
296			{
297			$className = self::_getName($class);
298
299			do
300			{
301			if (!empty(self::$_events[$name][$className]))
302			{
303			return true;
304			}
305			}
306			while (($className = get_parent_class($className)) !== false);
307			return false;
308			}
309
310			/**
311			* Get class name
312			* @param AnnotatedInterface\|string $class
313			* @return string
314			*/
315			private static function _getName($class)
316			{
317			if (is_object($class))
318			{
319			$class = get_class($class);
320			}
321			else
322			{
323			if (!ClassChecker::exists($class))
324			{
325			throw new UnexpectedValueException(sprintf("Class `%s` not found", $class));
326			}
327			}
328			return ltrim($class, '\\');
329			}
330
331			/**
332			* Propagate event
333			* @param AnnotatedInterface $model
334			* @param string $name
335			* @param ModelEvent\|null $event
336			*/
337			private static function _propagate(AnnotatedInterface $model, $name, &$event = null)
338			{
339			$wasTriggered = false;
340			if ($event && !$event->propagate())
341			{
342			return false;
343			}
344			$meta = ManganMeta::create($model);
345			foreach ($meta->properties('propagateEvents') as $property => $propagate)
346			{
347			if (!$propagate)
348			{
349			continue;
350			}
351			if (!$model->$property)
352			{
353			continue;
354			}
355			// Trigger for arrays
356			if (is_array($model->$property))
357			{
358			foreach ($model->$property as $object)
359			{
360			$wasTriggered = self::trigger($object, $name, $event);
361			}
362			continue;
363			}
364			// Trigger for single value
365			$wasTriggered = self::trigger($model->$property, $name, $event);
366			}
367			return $wasTriggered;
368			}
369
370			}
371

Maslosoft / Mangan

Push — string-event-subscriptions ( e8cd90 )

Event::_propagate() C

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

Filter issues like