PHP code example of sharkydog / private-emitter

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

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

    

sharkydog / private-emitter example snippets

use SharkyDog\PrivateEmitter\PrivateEmitterTrait;

class Emitter1 {
  use PrivateEmitterTrait;

  public function pubEmitter(): callable {
    return $this->_emitter();
  }

  public function event1($p) {
    $this->_emit('event1', [$p]);
  }
}

$emitter = new Emitter1;
$emitter->on('event1', function($p) {
  echo "event1: $p\n";
});

$emitter->event1('works');
$emitter->emit('event1', ['does not work']);

$pubEmitter = $emitter->pubEmitter();
$pubEmitter('event1', ['also works']);

use SharkyDog\PrivateEmitter\PrivateEmitterTrait;

class Emitter2 {
  use PrivateEmitterTrait;

  public function pubEmitter(): callable {
    return $this->_emitter();
  }

  private function _event_event1($p) {
    print "_event_event1: $p\n";
    $this->_emit('event2', [$p]);
  }
  private function _event_event2($p) {
    print "_event_event2: $p\n";
    $this->_emit('event2', [$p]);
    $this->_emit('event3', [$p]);
  }
}

$emitter = new Emitter2;

$emitter->on('event1', function($p) {
  echo "event1: $p\n";
});
$emitter->on('event2', function($p) {
  echo "event2: $p\n";
});
$emitter->on('event3', function($p) {
  echo "event3: $p\n";
});

$pubEmitter = $emitter->pubEmitter();

// calls _event_event1 and emits event2
// then calls _event_event2 and emits event2 and event3
// prints:
//  _event_event1: p1
//  _event_event2: p1
//  event2: p1
//  event3: p1
$pubEmitter('event1', ['p1']);

use SharkyDog\PrivateEmitter\PrivateEmitterTrait;
use Evenement\EventEmitter;

// Events can be emitted only
// by whoever $emitter is shared with
class PrivateEmitter {
  use PrivateEmitterTrait;
  public function __construct(&$emitter) {
    $emitter = $this->_emitter();
  }
}

// A simple and boring emitter
class PublicEmitter extends EventEmitter {}

$prvEmitter1Obj = new PrivateEmitter($prvEmitter1Fn);
$prvEmitter2Obj = new PrivateEmitter($prvEmitter2Fn);
$pubEmitter1Obj = new PublicEmitter;

// Let this serve as forwarding callback signature
$pubEmitter1Fn = function(string $event, array $args) use($pubEmitter1Obj) {
  $pubEmitter1Obj->emit($event,$args);
};
// or as EventEmitter::emit() is public
// forwardEvents() bellow can be used with array callable
//$pubEmitter1Fn = [$pubEmitter1Obj,'emit'];

// first listener, first to receive event1
$prvEmitter1Obj->on('event1', function() { echo "event1: prv1\n"; });
// second listener for event1, first for event2
$prvEmitter1Obj->forwardEvents($prvEmitter2Fn, 'event1','event2');
// third listener for event1, second for event2
$prvEmitter1Obj->forwardEvents($pubEmitter1Fn, 'event1','event2');
// third listener for event2
$prvEmitter1Obj->on('event2', function() { echo "event2: prv1\n"; });

// listeners on objects events are forwarded to
$prvEmitter2Obj->on('event1', function() { echo "event1: prv2\n"; });
$prvEmitter2Obj->on('event2', function() { echo "event2: prv2\n"; });
$pubEmitter1Obj->on('event1', function() { echo "event1: pub1\n"; });
$pubEmitter1Obj->on('event2', function() { echo "event2: pub1\n"; });

// prints
//  event1: prv1
//  event1: prv2
//  event1: pub1
//  event2: prv2
//  event2: pub1
//  event2: prv1
$prvEmitter1Fn('event1');
$prvEmitter1Fn('event2');