phossa/phossa-event

A event management library for PHP

1.0.7 2016-05-27 03:38 UTC

Requires

• php: >=5.4.0
• phossa/phossa-shared: >=1.0.8

MIT

• Hong Zhang

• framework
• event
• phossa

README

See new lib at phoole/event Introduction

Phossa-event is an event management library for PHP. It decoupled from any packages other than the phossa/phossa-shared. It requires PHP5.4 only.

Installation

Install via the composer utility.

composer require "phossa/phossa-event=1.*"

or add the following lines to your composer.json

{
    "require": {
       "phossa/phossa-event": "1.*"
    }
}

Simple EventDispatcher

Simple event dispatching using Phossa\Event\EventDispatcher

• Simple usage

  $dispatcher = new EventDispatcher();
  
  // bind event 'user.login' to a callable
  $dispatcher->on('user.login', function(Event $evt) {
      // ...
  });
  
  // trigger the 'user.login' event, passing data
  $dispatcher->trigger('user.login', [ 'user' => $user ]);

  or use statically (global dispatching)

  // bind event with priority 60 (0 - 100, high # higher priority)
  EventDispatcher::on('user.login', function(Event $evt) {
      // ...
  }, 60);
  
  // trigger the 'user.login' event
  EventDispatcher::trigger('user.login', [ 'user' => $user ]);

• Trigger for limited times

  // bind event for once
  $dispatcher->one('user.login', function(Event $evt) {
      // ...
  });
  
  // allow 3 times
  $dispatcher->many('user.tag', 3, function(Event $evt) {
      // ...
  });

• Event globbing

  // globbing
  $dispatcher->on('user.*', function(Event $evt) {
      //...
  });

• Detach events

  // detach
  $dispatcher->off('user.*');

• Monitoring PHP errors

  Execute a callable when PHP error happens.

  // callable returns bool
  $dispatcher->error(function($errno, $errstr, $errfile, $errline) {
      // ...
      return true;
  });

• Execute a callable when script finishes

  // run this after script ends
  $dispatcher->ready(function() {
      // ...
  });

Full-fledged EventManager

Complex event management using Phossa\Event\EventManager with full fledge support for event listener, event subject, local event manager and global event manageretc.

• Event listener

  use Phossa\Event\Interfaces;
  
  class MyListener implements Interfaces\EventListenerInteface
  {
      /*
       * Get events and callables MyListener listens to
       */
      public function getEventsListening()
      {
          return array(
              'eventName1' => 'method1', // method1 of $this
              'eventName2' => array('method2', 20), // priority 20
              'eventName3' => array( // multiple callables
                  [ 'method3', 70 ],
                  [ 'method4', 50 ]
              )
          );
      }
  }
  
  $listener = new MyListener();

• Event manager

  // create an event manager
  $evtManager = new Event\EventManager();
  
  // attach a listener object
  $evtManager->attachListener($listener);
  
  // attach a callable directly to 'oneSpecialEvent'
  $callable = function(Event\Event $evt) {
      ...
  };
  $evtManager->attachListener($callable, 'oneSpecialEvent');
  
  // detach a callable
  $evtManager->detachListener($callable);

• The event-aware subject

  use Phossa\Event\Interfaces;
  
  class MyEventAware implements Interfaces\EventAwareInterface
  {
      // add setEventManager() and triggerEvent()
      use Interfaces\EventAwareTrait;
  
      ...
  }
  
  $subject = new MyEventAware();

• Combine together

  // set manager to event-aware subject
  $subject->setEventManager($evtManager);
  
  // trigger event
  $subject->triggerEvent('eventName2');

• Event globbing

  Able to listen to all events by using '' or 'event'.

  use Phossa\Event\Interfaces\EventListenerInterface;
  
  class Listener implements EventListenerInterface
  {
      public function getEventsListening()
      {
          return [
              'evtTest1' => 'testC',
              'evtTest2' => [ 'testD', 20 ],
              'evtTest3' => [
                  [ 'testA', 70 ],
                  [ 'testB', 50 ]
              ],
              // globbing
              'evt*' => 'bingo',
              'evtTest*' => 'bingo2',
              '*' => 'wow',
          ];
      }
  }

• Event management for static classes.

  The static listener class,

  use Phossa\Event\Interfaces;
  
  class StaticListener implements Interfaces\EventListenerStaticInteface
  {
      /*
       * Get events and callables StaticListener listens to
       */
      public static function getEventsListening()
      {
          return array(
              'eventName1' => 'method1', // method1 of $this
              'eventName2' => array('method2', 20), // priority 20
              'eventName3' => array( // multiple callables
                  [ 'method3', 70 ],
                  [ 'method4', 50 ]
              )
          );
      }
  }

  The static subject class to use events,

  use Phossa\Event\Interfaces;
  
  class StaticEventAware implements Interfaces\EventAwareStaticInterface
  {
      // add setEventManager() and triggerEvent()
      use Interfaces\EventAwareStaticTrait;
  
      ...
  }

  The static subject class trigger events as follows,

  // create an event manager/dispatcher
  $evtManager = new Event\EventManager();
  
  // attach a static listener class
  $evtManager->attachListener(StaticListener::CLASS);
  
  // set manager/dispatcher to event-aware static subject class
  StaticEventAware::setEventManagerStatically($evtManager);
  
  // trigger event by the static subject class
  StaticEventAware::triggerEventStatically('eventName2');

• Composite event manager

  Able to use composite event manager as follows,

  use Phossa\Event;
  
  // global event manager
  $global_manager = new Event\EventManager();
  $global_manager->attachListener($some_global_event_listener);
  
  // local event manager
  $local_manager  = new Event\Variation\EventManagerComposite();
  $local_manager->attachListener($local_listener);
  
  // allow local event manager dispatch events to global event manager
  $local_manager->setOtherManager('global', $global_manager);
  
  // the event aware subject
  $subject = new MyEventAware();
  
  // set event manager
  $subject->setEventManager($local_manager);
  
  // fire up an event, will look into event handling queue from both
  // $local_manager and $global_manager
  $subject->triggerEvent('some_event');

• Immutable event manager

  use Phossa\Event;
  
  // low-level manager to hide
  $_evtManager = new EventManager();
  $_evtManager->attachListener(...);
  ...
  
  // expose an immutable event managet to user
  $evtManager = new Variation\ImmutableEventManager($_evtManager);
  
  // cause an exception
  $evtManager->detachListener( ... );

• Shareable event manager, a single copy of global manager and lots of local managers.

  // get global copy by using static method `getInstance()`
  $globalEventManager = ShareableEventManager::getInstance();
  
  // normal event managers
  $localEventManager  = new ShareableEventManager();
  
  // is this the global copy?
  if ($evtManager->isShareable()) {
      ...
  } else {
      ...
  }

Features

• Supports PHP 5.4+, PHP 7.0+, HHVM.

• PHP7 ready for return type declarations and argument type declarations.

• PSR-1, PSR-2, PSR-4 compliant.

• Decoupled packages can be used seperately without the framework.

Dependencies

• PHP >= 5.4.0

• phossa/phossa-shared >= 1.0.8

License

MIT License