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ServiceLocator.php
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125 lines (108 loc) · 2.75 KB
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<?php
/**
* This file is part of the PPI Framework.
*
* @copyright Copyright (c) 2012 Paul Dragoonis <[email protected]>
* @license http://opensource.org/licenses/mit-license.php MIT
*
* @link http://www.ppi.io
*/
namespace PPI\Framework\Module;
/**
* The PPI Service Locator.
*
* @author Paul Dragoonis <[email protected]>
*/
class ServiceLocator
{
/**
* @todo Add inline documentation.
*
* @var array
*/
protected $loadedService = array();
/**
* @todo Add inline documentation.
*
* @var array
*/
protected $services = array();
/**
* @todo Add inline documentation.
*
* @param array $services
*/
public function __construct(array $services = array())
{
if (!empty($services)) {
foreach ($services as $key => $service) {
$this->services[strtolower($key)] = $service;
}
}
}
/**
* Get a registered service by its name.
*
* @param string $key
*
* @throws \Exception|\InvalidArgumentException
*
* @return mixed
*/
public function get($key)
{
$key = strtolower($key);
if (!isset($this->services[$key])) {
throw new \InvalidArgumentException('Service not found: ' . $key);
}
// Have we been here before?
if (isset($this->loadedService[$key])) {
return $this->loadedService[$key];
}
if (!$this->services[$key] instanceof Service) {
$this->loadedService[$key] = $this->services[$key];
return $this->loadedService[$key];
}
// It's a Service instance, lets do some extra stuff.
if (!$this->services[$key]->hasClassName()) {
throw new \Exception('Unable to find class name from definition: ' . $key);
}
$className = $this->services[$key]->getClassName();
$instance = new $className();
if ($this->services[$key]->hasFactoryMethod()) {
call_user_func($instance, $this->services[$key]->getFactoryMethod());
}
$this->loadedService[$key] = $instance;
return $this->loadedService[$key];
}
/**
* Set a service.
*
* @param string $key
* @param mixed $service
*/
public function set($key, $service)
{
$this->services[strtolower($key)] = $service;
}
/**
* Check if a service has been registered.
*
* @param string $key
*
* @return bool
*/
public function has($key)
{
return isset($this->services[strtolower($key)]);
}
/**
* @todo Add inline documentation.
*
* @return array
*/
public function getKeys()
{
return array_keys($this->services);
}
}