<?php
/**
* Magento object manager. Responsible for instantiating objects taking into account:
* - constructor arguments (using configured, and provided parameters)
* - class instances life style (singleton, transient)
* - interface preferences
*
* Intentionally contains multiple concerns for best performance
*
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\ObjectManager;

class ObjectManager implements \Magento\Framework\ObjectManagerInterface
{
/**
* @var \Magento\Framework\ObjectManager\FactoryInterface
*/
protected $_factory;

/**
* List of shared instances
*
* @var array
*/
protected $_sharedInstances = [];

/**
* @var ConfigInterface
*/
protected $_config;

/**
* @param FactoryInterface $factory
* @param ConfigInterface $config
* @param array &$sharedInstances
*/
public function __construct(FactoryInterface $factory, ConfigInterface $config, &$sharedInstances = [])
{
$this->_config = $config;
$this->_factory = $factory;
$this->_sharedInstances = &$sharedInstances;
$this->_sharedInstances[\Magento\Framework\ObjectManagerInterface::class] = $this;
}

/**
* Create new object instance
*
* @param string $type
* @param array $arguments
* @return mixed
*/
public function create($type, array $arguments = [])
{
return $this->_factory->create($this->_config->getPreference($type), $arguments);
}

/**
* Retrieve cached object instance
*
* @param string $type
* @return mixed
*/
public function get($type)
{
$type = ltrim($type, '\\');
$type = $this->_config->getPreference($type);
if (!isset($this->_sharedInstances[$type])) {
$this->_sharedInstances[$type] = $this->_factory->create($type);
}
return $this->_sharedInstances[$type];
}

/**
* Configure di instance
* Note: All arguments should be pre-processed (sort order, translations, etc) before passing to method configure.
*
* @param array $configuration
* @return void
*/
public function configure(array $configuration)
{
$this->_config->extend($configuration);
}
}