src/Core/Kernel.php

   1 <?php
   2
   3 /**
   4  * OpenEMR <https://open-emr.org>.
   5  *
   6  * @license https://github.com/openemr/openemr/blob/master/LICENSE GNU General Public License 3
   7  */
   8
   9 namespace OpenEMR\Core;
  10
  11 use Symfony\Component\DependencyInjection\Reference;
  12 use Symfony\Component\DependencyInjection\Definition;
  13 use Symfony\Component\DependencyInjection\ContainerBuilder;
  14 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
  15 use Symfony\Component\EventDispatcher\EventDispatcher;
  16 use Symfony\Component\EventDispatcher\DependencyInjection\RegisterListenersPass;
  17
  18 /**
  19  * Class Kernel.
  20  *
  21  * This is the core of OpenEMR. It is a thin class enabling service containers,
  22  * event dispatching for now.
  23  *
  24  * @package OpenEMR
  25  * @subpackage Core
  26  * @author Robert Down <robertdown@live.com>
  27  * @copyright Copyright (c) 2017-2022 Robert Down
  28  */
  29 class Kernel
  30 {
  31     /** @var ContainerBuilder */
  32     private $container;
  33
  34     public function __construct()
  35     {
  36         $this->prepareContainer();
  37     }
  38
  39     /**
  40      * Setup the initial container
  41      */
  42     private function prepareContainer()
  43     {
  44         if (!$this->container) {
  45             $builder = new ContainerBuilder(new ParameterBag());
  46             $builder->addCompilerPass(new RegisterListenersPass());
  47             $definition = new Definition(EventDispatcher::class, [new Reference('service_container')]);
  48             $definition->setPublic(true);
  49             $builder->setDefinition('event_dispatcher', $definition);
  50             $builder->compile();
  51             $this->container = $builder;
  52         }
  53     }
  54
  55     /**
  56      * Return true if the environment variable OPENEMR__ENVIRONMENT is set to dev.
  57      *
  58      * @return bool
  59      */
  60     public function isDev()
  61     {
  62         return (($_ENV['OPENEMR__ENVIRONMENT'] ?? '') === 'dev') ? true : false;
  63     }
  64
  65     /**
  66      * Get the Service Container
  67      *
  68      * @return ContainerBuilder
  69      */
  70     public function getContainer()
  71     {
  72         if (!$this->container) {
  73             $this->prepareContainer();
  74         }
  75
  76         return $this->container;
  77     }
  78
  79     /**
  80      * Get the Event Dispatcher
  81      *
  82      * @return EventDispatcher
  83      * @throws \Exception
  84      */
  85     public function getEventDispatcher()
  86     {
  87         if ($this->container) {
  88             /** @var EventDispatcher $dispatcher */
  89             return $this->container->get('event_dispatcher');
  90         } else {
  91             throw new \Exception('Container does not exist');
  92         }
  93     }
  94 }