PHP code example of jasny / event-dispatcher

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

jasny / event-dispatcher example snippets

namespace App\Event;

/**
 * Base class for all events in this application.
 */
abstract class Base
{
    /** @var object */
    protected $emitter;

    /** @var mixed */
    protected $payload;

    public function __construct(object $emitter, $payload = null)
    {
        $this->emitter = $emitter;
        $this->payload = $payload;
    }
    
    final public function getEmitter(): object
    {
        return $this->emitter;
    }

    public function setPayload($payload): void
    {
        $this->payload = $payload;
    }

    public function getPayload()
    {
        return $this->payload;
    }
}

/**
 * Called before an entity is saved to the database.
 */
class BeforeSave extends Base
{}

/**
 * Called when an entity is casted to json.
 */
class ToJson extends Base
{} 

use App\Event;
use Jasny\EventDispatcher\EventDispatcher;
use Jasny\EventDispatcher\ListenerProvider;

$listener = (new ListenerProvider)
    ->withListener(function(Event\BeforeSave $event): void {
        $entity = $event->getEmitter();
        $payload = $event->getPayload();
        
        $payload['bio'] = $payload['bio'] ?? ($entity->name . " just arrived");
        $event->setPayload($payload);
    })
    ->withListener(function(Event\ToJson $event): void {
        $payload = $event->getPayload();
        
        unset($payload['password']);
        $event->setPayload($payload);
    });

$dispatcher = new EventDispatcher($listener);

use App\Event;
use Jasny\EventDispatcher\EventDispatcher;

class Foo implements JsonSerializable
{
    /**
     * @var EventDispatcher
     */
    protected $eventDispatcher;

    // ...
    
    public function jsonSerialize()
    {
        $payload = get_object_vars($this);
    
        return $this->eventDispatcher->dispatch(new Event\ToJson($this, $payload));
    }
}

use App\Event;

$newListener = $dispatcher->getListener()
    ->off(function(Event\BeforeSave $event): void {
        $payload = $event->getPayload();
       
        $payload['bio'] = strtr($payload['bio'], $payload['email'], '***@***.***');
        $event->setPayload($payload);
    });

$newDispatcher = $dispatcher->withListenerProvider($newListener);

namespace App\Event;

use Psr\EventDispatcher\StoppableEventInterface;

/**
 * Called before an entity is saved to the database.
 */
class BeforeSave implememnts StoppableEventInterface
{
    // ...

    public function stopPropagation(): void
    {
        $this->propagationStopped = true;
    }

    public function isPropagationStopped(): bool
    {
        return $this->propagationStopped;
    }
}

use App\Event;
use Jasny\EventDispatcher\EventDispatcher;
use Jasny\EventDispatcher\ListenerProvider;

$listener = (new ListenerProvider)
    ->on(function(Event\BeforeSave $event): void {
        $entity = $event->getEmitter();
        
        if (!$entity->isReady()) {
            $event->stopPropagation();
        }
    });
    
$dispatcher = new EventDispatcher($listener);

use App\Event;
use Jasny\EventDispatcher\EventDispatcher;
use Jasny\EventDispatcher\ListenerProvider;

$listener = (new ListenerProvider)
    ->withListenerInNs('censor', function(Event\BeforeSave $event): void {
        $payload = $event->getPayload();
        
        $payload['bio'] = strtr($payload['bio'], $payload['email'], '***@***.***');
        $event->setPayload($payload);
    });
    ->withListenerInNs('censor.json', function(Event $event): void {
        $payload = $event->getPayload();
        
        unset($payload['password']);
        $event->setPayload($payload);
    });

$newListeners = $dispatcher->getListenerProvider()->withoutNs('censor');

$newListeners = $dispatcher->getListenerProvider()->withoutNs('*.json');