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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\ServiceManager;
/**
* ServiceManager implementation for managing plugins
*
* Automatically registers an initializer which should be used to verify that
* a plugin instance is of a valid type. Additionally, allows plugins to accept
* an array of options for the constructor, which can be used to configure
* the plugin when retrieved. Finally, enables the allowOverride property by
* default to allow registering factories, aliases, and invokables to take
* the place of those provided by the implementing class.
*/
abstract class AbstractPluginManager extends ServiceManager implements ServiceLocatorAwareInterface
{
/**
* Allow overriding by default
*
* @var bool
*/
protected $allowOverride = true;
/**
* Whether or not to auto-add a class as an invokable class if it exists
*
* @var bool
*/
protected $autoAddInvokableClass = true;
/**
* Options to use when creating an instance
*
* @var mixed
*/
protected $creationOptions = null;
/**
* The main service locator
*
* @var ServiceLocatorInterface
*/
protected $serviceLocator;
/**
* Constructor
*
* Add a default initializer to ensure the plugin is valid after instance
* creation.
*
* @param null|ConfigInterface $configuration
*/
public function __construct(ConfigInterface $configuration = null)
{
parent::__construct($configuration);
$self = $this;
$this->addInitializer(function ($instance) use ($self) {
if ($instance instanceof ServiceLocatorAwareInterface) {
$instance->setServiceLocator($self);
}
});
}
/**
* Validate the plugin
*
* Checks that the filter loaded is either a valid callback or an instance
* of FilterInterface.
*
* @param mixed $plugin
* @return void
* @throws Exception\RuntimeException if invalid
*/
abstract public function validatePlugin($plugin);
/**
* Retrieve a service from the manager by name
*
* Allows passing an array of options to use when creating the instance.
* createFromInvokable() will use these and pass them to the instance
* constructor if not null and a non-empty array.
*
* @param string $name
* @param array $options
* @param bool $usePeeringServiceManagers
* @return object
*/
public function get($name, $options = array(), $usePeeringServiceManagers = true)
{
// Allow specifying a class name directly; registers as an invokable class
if (!$this->has($name) && $this->autoAddInvokableClass && class_exists($name)) {
$this->setInvokableClass($name, $name);
}
$this->creationOptions = $options;
$instance = parent::get($name, $usePeeringServiceManagers);
$this->creationOptions = null;
$this->validatePlugin($instance);
return $instance;
}
/**
* Register a service with the locator.
*
* Validates that the service object via validatePlugin() prior to
* attempting to register it.
*
* @param string $name
* @param mixed $service
* @param bool $shared
* @return AbstractPluginManager
* @throws Exception\InvalidServiceNameException
*/
public function setService($name, $service, $shared = true)
{
if ($service) {
$this->validatePlugin($service);
}
parent::setService($name, $service, $shared);
return $this;
}
/**
* Set the main service locator so factories can have access to it to pull deps
*
* @param ServiceLocatorInterface $serviceLocator
* @return AbstractPluginManager
*/
public function setServiceLocator(ServiceLocatorInterface $serviceLocator)
{
$this->serviceLocator = $serviceLocator;
return $this;
}
/**
* Get the main plugin manager. Useful for fetching dependencies from within factories.
*
* @return ServiceLocatorInterface
*/
public function getServiceLocator()
{
return $this->serviceLocator;
}
/**
* Attempt to create an instance via an invokable class
*
* Overrides parent implementation by passing $creationOptions to the
* constructor, if non-null.
*
* @param string $canonicalName
* @param string $requestedName
* @return null|\stdClass
* @throws Exception\ServiceNotCreatedException If resolved class does not exist
*/
protected function createFromInvokable($canonicalName, $requestedName)
{
$invokable = $this->invokableClasses[$canonicalName];
if (!class_exists($invokable)) {
throw new Exception\ServiceNotFoundException(sprintf(
'%s: failed retrieving "%s%s" via invokable class "%s"; class does not exist',
get_class($this) . '::' . __FUNCTION__,
$canonicalName,
($requestedName ? '(alias: ' . $requestedName . ')' : ''),
$invokable
));
}
if (null === $this->creationOptions
|| (is_array($this->creationOptions) && empty($this->creationOptions))
) {
$instance = new $invokable();
} else {
$instance = new $invokable($this->creationOptions);
}
return $instance;
}
/**
* Attempt to create an instance via a factory class
*
* Overrides parent implementation by passing $creationOptions to the
* constructor, if non-null.
*
* @param string $canonicalName
* @param string $requestedName
* @return mixed
* @throws Exception\ServiceNotCreatedException If factory is not callable
*/
protected function createFromFactory($canonicalName, $requestedName)
{
$factory = $this->factories[$canonicalName];
$hasCreationOptions = !(null === $this->creationOptions || (is_array($this->creationOptions) && empty($this->creationOptions)));
if (is_string($factory) && class_exists($factory, true)) {
if (!$hasCreationOptions) {
$factory = new $factory();
} else {
$factory = new $factory($this->creationOptions);
}
$this->factories[$canonicalName] = $factory;
}
if ($factory instanceof FactoryInterface) {
$instance = $this->createServiceViaCallback(array($factory, 'createService'), $canonicalName, $requestedName);
} elseif (is_callable($factory)) {
$instance = $this->createServiceViaCallback($factory, $canonicalName, $requestedName);
} else {
throw new Exception\ServiceNotCreatedException(
sprintf(
'While attempting to create %s%s an invalid factory was registered for this instance type.',
$canonicalName,
($requestedName ? '(alias: ' . $requestedName . ')' : '')
)
);
}
return $instance;
}
/**
* Create service via callback
*
* @param callable $callable
* @param string $cName
* @param string $rName
* @throws Exception\ServiceNotCreatedException
* @throws Exception\ServiceNotFoundException
* @throws Exception\CircularDependencyFoundException
* @return object
*/
protected function createServiceViaCallback($callable, $cName, $rName)
{
if (is_object($callable)) {
$factory = $callable;
} elseif (is_array($callable)) {
// reset both rewinds and returns the value of the first array element
$factory = reset($callable);
}
if (isset($factory)
&& ($factory instanceof MutableCreationOptionsInterface)
&& is_array($this->creationOptions)
&& !empty($this->creationOptions)
) {
$factory->setCreationOptions($this->creationOptions);
}
return parent::createServiceViaCallback($callable, $cName, $rName);
}
}