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 require_once dirname(__FILE__) . '/../../interface/globals.php';
  12
  13 use Symfony\Component\DependencyInjection\Reference;
  14 use Symfony\Component\DependencyInjection\Definition;
  15 use Symfony\Component\DependencyInjection\ContainerBuilder;
  16 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
  17 use Symfony\Component\EventDispatcher\EventDispatcher;
  18 use Symfony\Component\EventDispatcher\DependencyInjection\RegisterListenersPass;
  19
  20 /**
  21  * Class Kernel.
  22  *
  23  * This is the core of OpenEMR. It is a thin class enabling service containers,
  24  * event dispatching for now.
  25  *
  26  * @package OpenEMR
  27  * @subpackage Core
  28  * @author Robert Down <robertdown@live.com>
  29  * @copyright Copyright (c) 2017 Robert Down
  30  */
  31 class Kernel
  32 {
  33     /** @var ContainerBuilder */
  34     private $container;
  35
  36     public function __construct()
  37     {
  38         $this->prepareContainer();
  39     }
  40
  41     /**
  42      * Setup the initial container
  43      */
  44     private function prepareContainer()
  45     {
  46         if (!$this->container) {
  47             $builder = new ContainerBuilder(new ParameterBag());
  48             $builder->addCompilerPass(new RegisterListenersPass());
  49             $definition = new Definition(EventDispatcher::class, [new Reference('service_container')]);
  50             $definition->setPublic(true);
  51             $builder->setDefinition('event_dispatcher', $definition);
  52             $builder->compile();
  53             $this->container = $builder;
  54         }
  55     }
  56
  57     /**
  58      * Return true if the environment variable OPENEMR__ENVIRONMENT is set to dev.
  59      *
  60      * @return bool
  61      */
  62     public function isDev()
  63     {
  64         return (($_ENV['OPENEMR__ENVIRONMENT'] ?? '') === 'dev') ? true : false;
  65     }
  66
  67     /**
  68      * Get the Service Container
  69      *
  70      * @return ContainerBuilder
  71      */
  72     public function getContainer()
  73     {
  74         if (!$this->container) {
  75             $this->prepareContainer();
  76         }
  77
  78         return $this->container;
  79     }
  80
  81     /**
  82      * Get the Event Dispatcher
  83      *
  84      * @return EventDispatcher
  85      * @throws \Exception
  86      */
  87     public function getEventDispatcher()
  88     {
  89         if ($this->container) {
  90             /** @var EventDispatcher $dispatcher */
  91             return $this->container->get('event_dispatcher');
  92         } else {
  93             throw new \Exception('Container does not exist');
  94         }
  95     }
  96 }