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Event.php
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Event.php
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<?php
/**
* Hoa
*
*
* @license
*
* New BSD License
*
* Copyright © 2007-2015, Hoa community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Hoa nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
namespace Hoa\Core\Event;
use Hoa\Core;
/**
* Interface \Hoa\Core\Event\Source.
*
* Each object which is observable must implement this interface.
*
* @copyright Copyright © 2007-2015 Hoa community
* @license New BSD License
*/
interface Source
{
}
/**
* Class \Hoa\Core\Event\Bucket.
*
* This class is the object which is transmit through event channels.
*
* @copyright Copyright © 2007-2015 Hoa community
* @license New BSD License
*/
class Bucket
{
/**
* Source object.
*
* @var \Hoa\Core\Event\Source
*/
protected $_source = null;
/**
* Data.
*
* @var mixed
*/
protected $_data = null;
/**
* Set data.
*
* @param mixed $data Data.
* @return void
*/
public function __construct($data = null)
{
$this->setData($data);
return;
}
/**
* Send this object on the event channel.
*
* @param string $eventId Event ID.
* @param \Hoa\Core\Event\Source $source Source.
* @return void
* @throws \Hoa\Core\Exception
*/
public function send($eventId, Source $source)
{
return Event::notify($eventId, $source, $this);
}
/**
* Set source.
*
* @param \Hoa\Core\Event\Source $source Source.
* @return \Hoa\Core\Event\Source
*/
public function setSource(Source $source)
{
$old = $this->_source;
$this->_source = $source;
return $old;
}
/**
* Get source.
*
* @return \Hoa\Core\Event\Source
*/
public function getSource()
{
return $this->_source;
}
/**
* Set data.
*
* @param mixed $data Data.
* @return mixed
*/
public function setData($data)
{
$old = $this->_data;
$this->_data = $data;
return $old;
}
/**
* Get data.
*
* @return mixed
*/
public function getData()
{
return $this->_data;
}
}
/**
* Class \Hoa\Core\Event.
*
* Events are asynchronous at registration, anonymous at use (until we
* receive a bucket) and useful to largely spread data through components
* without any known connection between them.
*
* @copyright Copyright © 2007-2015 Hoa community
* @license New BSD License
*/
class Event
{
/**
* Static register of all observable objects, i.e. \Hoa\Core\Event\Source
* object, i.e. object that can send event.
*
* @var array
*/
private static $_register = [];
/**
* Callables, i.e. observer objects.
*
* @var array
*/
protected $_callable = [];
/**
* Privatize the constructor.
*
* @return void
*/
private function __construct()
{
return;
}
/**
* Manage multiton of events, with the principle of asynchronous
* attachements.
*
* @param string $eventId Event ID.
* @return \Hoa\Core\Event
*/
public static function getEvent($eventId)
{
if (!isset(self::$_register[$eventId][0])) {
self::$_register[$eventId] = [
0 => new self(),
1 => null
];
}
return self::$_register[$eventId][0];
}
/**
* Declare a new object in the observable collection.
* Note: Hoa's libraries use hoa://Event/AnID for their observable objects;
*
* @param string $eventId Event ID.
* @param \Hoa\Core\Event\Source $source Observable object.
* @return void
* @throws \Hoa\Core\Exception
*/
public static function register($eventId, $source)
{
if (true === self::eventExists($eventId)) {
throw new Core\Exception(
'Cannot redeclare an event with the same ID, i.e. the event ' .
'ID %s already exists.',
0,
$eventId
);
}
if (is_object($source) && !($source instanceof Source)) {
throw new Core\Exception(
'The source must implement \Hoa\Core\Event\Source ' .
'interface; given %s.',
1,
get_class($source)
);
} else {
$reflection = new \ReflectionClass($source);
if (false === $reflection->implementsInterface('\Hoa\Core\Event\Source')) {
throw new Core\Exception(
'The source must implement \Hoa\Core\Event\Source ' .
'interface; given %s.',
2,
$source
);
}
}
if (!isset(self::$_register[$eventId][0])) {
self::$_register[$eventId][0] = new self();
}
self::$_register[$eventId][1] = $source;
return;
}
/**
* Undeclare an object in the observable collection.
*
* @param string $eventId Event ID.
* @param bool $hard If false, just delete the source, else,
* delete source and attached callables.
* @return void
*/
public static function unregister($eventId, $hard = false)
{
if (false !== $hard) {
unset(self::$_register[$eventId]);
} else {
self::$_register[$eventId][1] = null;
}
return;
}
/**
* Attach an object to an event.
* It can be a callable or an accepted callable form (please, see the
* \Hoa\Core\Consistency\Xcallable class).
*
* @param mixed $callable Callable.
* @return \Hoa\Core\Event
*/
public function attach($callable)
{
$callable = xcallable($callable);
$this->_callable[$callable->getHash()] = $callable;
return $this;
}
/**
* Detach an object to an event.
* Please see $this->attach() method.
*
* @param mixed $callable Callable.
* @return \Hoa\Core\Event
*/
public function detach($callable)
{
unset($this->_callable[xcallable($callable)->getHash()]);
return $this;
}
/**
* Check if at least one callable is attached to an event.
*
* @return bool
*/
public function isListened()
{
return !empty($this->_callable);
}
/**
* Notify, i.e. send data to observers.
*
* @param string Event ID.
* @param \Hoa\Core\Event\Source $source Source.
* @param \Hoa\Core\Event\Bucket $data Data.
* @return void
* @throws \Hoa\Core\Exception
*/
public static function notify($eventId, Source $source, Bucket $data)
{
if (false === self::eventExists($eventId)) {
throw new Core\Exception(
'Event ID %s does not exist, cannot send notification.',
3,
$eventId
);
}
$data->setSource($source);
$event = self::getEvent($eventId);
foreach ($event->_callable as $callable) {
$callable($data);
}
return;
}
/**
* Check whether an event exists.
*
* @param string $eventId Event ID.
* @return bool
*/
public static function eventExists($eventId)
{
return
array_key_exists($eventId, self::$_register) &&
self::$_register[$eventId][1] !== null;
}
}
/**
* Interface \Hoa\Core\Event\Listenable.
*
* Each object which is listenable must implement this interface.
*
* @copyright Copyright © 2007-2015 Hoa community
* @license New BSD License
*/
interface Listenable extends Source
{
/**
* Attach a callable to a listenable component.
*
* @param string $listenerId Listener ID.
* @param mixed $callable Callable.
* @return \Hoa\Core\Event\Listenable
* @throws \Hoa\Core\Exception
*/
public function on($listenerId, $callable);
}
/**
* Class \Hoa\Core\Event\Listener.
*
* A contrario of events, listeners are synchronous, identified at use and
* useful for close interactions between one or some components.
*
* @copyright Copyright © 2007-2015 Hoa community
* @license New BSD License
*/
class Listener
{
/**
* Source of listener (for Bucket).
*
* @var \Hoa\Core\Event\Listenable
*/
protected $_source = null;
/**
* All listener IDs and associated listeners.
*
* @var array
*/
protected $_listen = null;
/**
* Build a listener.
*
* @param \Hoa\Core\Event\Listenable $source Source (for Bucket).
* @param array $ids Accepted ID.
* @return void
*/
public function __construct(Listenable $source, Array $ids)
{
$this->_source = $source;
$this->addIds($ids);
return;
}
/**
* Add acceptable ID (or reset).
*
* @param array $ids Accepted ID.
* @return void
*/
public function addIds(Array $ids)
{
foreach ($ids as $id) {
$this->_listen[$id] = [];
}
return;
}
/**
* Attach a callable to a listenable component.
*
* @param string $listenerId Listener ID.
* @param mixed $callable Callable.
* @return \Hoa\Core\Event\Listener
* @throws \Hoa\Core\Exception
*/
public function attach($listenerId, $callable)
{
if (false === $this->listenerExists($listenerId)) {
throw new Core\Exception(
'Cannot listen %s because it is not defined.',
0,
$listenerId
);
}
$callable = xcallable($callable);
$this->_listen[$listenerId][$callable->getHash()] = $callable;
return $this;
}
/**
* Detach a callable from a listenable component.
*
* @param string $listenerId Listener ID.
* @param mixed $callable Callable.
* @return \Hoa\Core\Event\Listener
*/
public function detach($listenerId, $callable)
{
unset($this->_callable[$listenerId][xcallable($callable)->getHash()]);
return $this;
}
/**
* Detach all callables from a listenable component.
*
* @param string $listenerId Listener ID.
* @return \Hoa\Core\Event\Listener
*/
public function detachAll($listenerId)
{
unset($this->_callable[$listenerId]);
return $this;
}
/**
* Check if a listener exists.
*
* @param string $listenerId Listener ID.
* @return bool
*/
public function listenerExists($listenerId)
{
return array_key_exists($listenerId, $this->_listen);
}
/**
* Send/fire a bucket to a listener.
*
* @param string $listenerId Listener ID.
* @param \Hoa\Core\Event\Bucket $data Data.
* @return array
* @throws \Hoa\Core\Exception
*/
public function fire($listenerId, Bucket $data)
{
if (false === $this->listenerExists($listenerId)) {
throw new Core\Exception(
'Cannot fire on %s because it is not defined.',
1
);
}
$data->setSource($this->_source);
$out = [];
foreach ($this->_listen[$listenerId] as $callable) {
$out[] = $callable($data);
}
return $out;
}
}
/**
* Alias.
*/
class_alias('Hoa\Core\Event\Event', 'Hoa\Core\Event');