417 lines
12 KiB
PHP
417 lines
12 KiB
PHP
|
<?php
|
||
|
declare(strict_types=1);
|
||
|
|
||
|
/**
|
||
|
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
|
||
|
* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
|
||
|
*
|
||
|
* Licensed under The MIT License
|
||
|
* For full copyright and license information, please see the LICENSE.txt
|
||
|
* Redistributions of files must retain the above copyright notice.
|
||
|
*
|
||
|
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
|
||
|
* @link https://cakephp.org CakePHP(tm) Project
|
||
|
* @since 3.0.0
|
||
|
* @license https://opensource.org/licenses/mit-license.php MIT License
|
||
|
*/
|
||
|
namespace Cake\Core;
|
||
|
|
||
|
use ArrayIterator;
|
||
|
use Cake\Event\EventDispatcherInterface;
|
||
|
use Cake\Event\EventListenerInterface;
|
||
|
use Countable;
|
||
|
use IteratorAggregate;
|
||
|
use RuntimeException;
|
||
|
use Traversable;
|
||
|
|
||
|
/**
|
||
|
* Acts as a registry/factory for objects.
|
||
|
*
|
||
|
* Provides registry & factory functionality for object types. Used
|
||
|
* as a super class for various composition based re-use features in CakePHP.
|
||
|
*
|
||
|
* Each subclass needs to implement the various abstract methods to complete
|
||
|
* the template method load().
|
||
|
*
|
||
|
* The ObjectRegistry is EventManager aware, but each extending class will need to use
|
||
|
* \Cake\Event\EventDispatcherTrait to attach and detach on set and bind
|
||
|
*
|
||
|
* @see \Cake\Controller\ComponentRegistry
|
||
|
* @see \Cake\View\HelperRegistry
|
||
|
* @see \Cake\Console\TaskRegistry
|
||
|
* @template TObject of object
|
||
|
* @template-implements \IteratorAggregate<string, TObject>
|
||
|
*/
|
||
|
abstract class ObjectRegistry implements Countable, IteratorAggregate
|
||
|
{
|
||
|
/**
|
||
|
* Map of loaded objects.
|
||
|
*
|
||
|
* @var array<object>
|
||
|
* @psalm-var array<array-key, TObject>
|
||
|
*/
|
||
|
protected $_loaded = [];
|
||
|
|
||
|
/**
|
||
|
* Loads/constructs an object instance.
|
||
|
*
|
||
|
* Will return the instance in the registry if it already exists.
|
||
|
* If a subclass provides event support, you can use `$config['enabled'] = false`
|
||
|
* to exclude constructed objects from being registered for events.
|
||
|
*
|
||
|
* Using {@link \Cake\Controller\Component::$components} as an example. You can alias
|
||
|
* an object by setting the 'className' key, i.e.,
|
||
|
*
|
||
|
* ```
|
||
|
* protected $components = [
|
||
|
* 'Email' => [
|
||
|
* 'className' => 'App\Controller\Component\AliasedEmailComponent'
|
||
|
* ];
|
||
|
* ];
|
||
|
* ```
|
||
|
*
|
||
|
* All calls to the `Email` component would use `AliasedEmail` instead.
|
||
|
*
|
||
|
* @param string $name The name/class of the object to load.
|
||
|
* @param array<string, mixed> $config Additional settings to use when loading the object.
|
||
|
* @return mixed
|
||
|
* @psalm-return TObject
|
||
|
* @throws \Exception If the class cannot be found.
|
||
|
*/
|
||
|
public function load(string $name, array $config = [])
|
||
|
{
|
||
|
if (isset($config['className'])) {
|
||
|
$objName = $name;
|
||
|
$name = $config['className'];
|
||
|
} else {
|
||
|
[, $objName] = pluginSplit($name);
|
||
|
}
|
||
|
|
||
|
$loaded = isset($this->_loaded[$objName]);
|
||
|
if ($loaded && !empty($config)) {
|
||
|
$this->_checkDuplicate($objName, $config);
|
||
|
}
|
||
|
if ($loaded) {
|
||
|
return $this->_loaded[$objName];
|
||
|
}
|
||
|
|
||
|
$className = $name;
|
||
|
if (is_string($name)) {
|
||
|
$className = $this->_resolveClassName($name);
|
||
|
if ($className === null) {
|
||
|
[$plugin, $name] = pluginSplit($name);
|
||
|
$this->_throwMissingClassError($name, $plugin);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* @psalm-var TObject $instance
|
||
|
* @psalm-suppress PossiblyNullArgument
|
||
|
**/
|
||
|
$instance = $this->_create($className, $objName, $config);
|
||
|
$this->_loaded[$objName] = $instance;
|
||
|
|
||
|
return $instance;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Check for duplicate object loading.
|
||
|
*
|
||
|
* If a duplicate is being loaded and has different configuration, that is
|
||
|
* bad and an exception will be raised.
|
||
|
*
|
||
|
* An exception is raised, as replacing the object will not update any
|
||
|
* references other objects may have. Additionally, simply updating the runtime
|
||
|
* configuration is not a good option as we may be missing important constructor
|
||
|
* logic dependent on the configuration.
|
||
|
*
|
||
|
* @param string $name The name of the alias in the registry.
|
||
|
* @param array<string, mixed> $config The config data for the new instance.
|
||
|
* @return void
|
||
|
* @throws \RuntimeException When a duplicate is found.
|
||
|
*/
|
||
|
protected function _checkDuplicate(string $name, array $config): void
|
||
|
{
|
||
|
$existing = $this->_loaded[$name];
|
||
|
$msg = sprintf('The "%s" alias has already been loaded.', $name);
|
||
|
$hasConfig = method_exists($existing, 'getConfig');
|
||
|
if (!$hasConfig) {
|
||
|
throw new RuntimeException($msg);
|
||
|
}
|
||
|
if (empty($config)) {
|
||
|
return;
|
||
|
}
|
||
|
$existingConfig = $existing->getConfig();
|
||
|
unset($config['enabled'], $existingConfig['enabled']);
|
||
|
|
||
|
$failure = null;
|
||
|
foreach ($config as $key => $value) {
|
||
|
if (!array_key_exists($key, $existingConfig)) {
|
||
|
$failure = " The `{$key}` was not defined in the previous configuration data.";
|
||
|
break;
|
||
|
}
|
||
|
if (isset($existingConfig[$key]) && $existingConfig[$key] !== $value) {
|
||
|
$failure = sprintf(
|
||
|
' The `%s` key has a value of `%s` but previously had a value of `%s`',
|
||
|
$key,
|
||
|
json_encode($value),
|
||
|
json_encode($existingConfig[$key])
|
||
|
);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if ($failure) {
|
||
|
throw new RuntimeException($msg . $failure);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Should resolve the classname for a given object type.
|
||
|
*
|
||
|
* @param string $class The class to resolve.
|
||
|
* @return string|null The resolved name or null for failure.
|
||
|
* @psalm-return class-string|null
|
||
|
*/
|
||
|
abstract protected function _resolveClassName(string $class): ?string;
|
||
|
|
||
|
/**
|
||
|
* Throw an exception when the requested object name is missing.
|
||
|
*
|
||
|
* @param string $class The class that is missing.
|
||
|
* @param string|null $plugin The plugin $class is missing from.
|
||
|
* @return void
|
||
|
* @throws \Exception
|
||
|
*/
|
||
|
abstract protected function _throwMissingClassError(string $class, ?string $plugin): void;
|
||
|
|
||
|
/**
|
||
|
* Create an instance of a given classname.
|
||
|
*
|
||
|
* This method should construct and do any other initialization logic
|
||
|
* required.
|
||
|
*
|
||
|
* @param object|string $class The class to build.
|
||
|
* @param string $alias The alias of the object.
|
||
|
* @param array<string, mixed> $config The Configuration settings for construction
|
||
|
* @return object
|
||
|
* @psalm-param TObject|string $class
|
||
|
* @psalm-return TObject
|
||
|
*/
|
||
|
abstract protected function _create($class, string $alias, array $config);
|
||
|
|
||
|
/**
|
||
|
* Get the list of loaded objects.
|
||
|
*
|
||
|
* @return array<string> List of object names.
|
||
|
*/
|
||
|
public function loaded(): array
|
||
|
{
|
||
|
return array_keys($this->_loaded);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Check whether a given object is loaded.
|
||
|
*
|
||
|
* @param string $name The object name to check for.
|
||
|
* @return bool True is object is loaded else false.
|
||
|
*/
|
||
|
public function has(string $name): bool
|
||
|
{
|
||
|
return isset($this->_loaded[$name]);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get loaded object instance.
|
||
|
*
|
||
|
* @param string $name Name of object.
|
||
|
* @return object Object instance.
|
||
|
* @throws \RuntimeException If not loaded or found.
|
||
|
* @psalm-return TObject
|
||
|
*/
|
||
|
public function get(string $name)
|
||
|
{
|
||
|
if (!isset($this->_loaded[$name])) {
|
||
|
throw new RuntimeException(sprintf('Unknown object "%s"', $name));
|
||
|
}
|
||
|
|
||
|
return $this->_loaded[$name];
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Provide public read access to the loaded objects
|
||
|
*
|
||
|
* @param string $name Name of property to read
|
||
|
* @return object|null
|
||
|
* @psalm-return TObject|null
|
||
|
*/
|
||
|
public function __get(string $name)
|
||
|
{
|
||
|
return $this->_loaded[$name] ?? null;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Provide isset access to _loaded
|
||
|
*
|
||
|
* @param string $name Name of object being checked.
|
||
|
* @return bool
|
||
|
*/
|
||
|
public function __isset(string $name): bool
|
||
|
{
|
||
|
return $this->has($name);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Sets an object.
|
||
|
*
|
||
|
* @param string $name Name of a property to set.
|
||
|
* @param object $object Object to set.
|
||
|
* @psalm-param TObject $object
|
||
|
* @return void
|
||
|
*/
|
||
|
public function __set(string $name, $object): void
|
||
|
{
|
||
|
$this->set($name, $object);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Unsets an object.
|
||
|
*
|
||
|
* @param string $name Name of a property to unset.
|
||
|
* @return void
|
||
|
*/
|
||
|
public function __unset(string $name): void
|
||
|
{
|
||
|
$this->unload($name);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Normalizes an object array, creates an array that makes lazy loading
|
||
|
* easier
|
||
|
*
|
||
|
* @param array $objects Array of child objects to normalize.
|
||
|
* @return array<string, array> Array of normalized objects.
|
||
|
*/
|
||
|
public function normalizeArray(array $objects): array
|
||
|
{
|
||
|
$normal = [];
|
||
|
foreach ($objects as $i => $objectName) {
|
||
|
$config = [];
|
||
|
if (!is_int($i)) {
|
||
|
$config = (array)$objectName;
|
||
|
$objectName = $i;
|
||
|
}
|
||
|
[, $name] = pluginSplit($objectName);
|
||
|
if (isset($config['class'])) {
|
||
|
$normal[$name] = $config + ['config' => []];
|
||
|
} else {
|
||
|
$normal[$name] = ['class' => $objectName, 'config' => $config];
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return $normal;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Clear loaded instances in the registry.
|
||
|
*
|
||
|
* If the registry subclass has an event manager, the objects will be detached from events as well.
|
||
|
*
|
||
|
* @return $this
|
||
|
*/
|
||
|
public function reset()
|
||
|
{
|
||
|
foreach (array_keys($this->_loaded) as $name) {
|
||
|
$this->unload((string)$name);
|
||
|
}
|
||
|
|
||
|
return $this;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Set an object directly into the registry by name.
|
||
|
*
|
||
|
* If this collection implements events, the passed object will
|
||
|
* be attached into the event manager
|
||
|
*
|
||
|
* @param string $name The name of the object to set in the registry.
|
||
|
* @param object $object instance to store in the registry
|
||
|
* @return $this
|
||
|
* @psalm-param TObject $object
|
||
|
*/
|
||
|
public function set(string $name, object $object)
|
||
|
{
|
||
|
[, $objName] = pluginSplit($name);
|
||
|
|
||
|
// Just call unload if the object was loaded before
|
||
|
if (array_key_exists($name, $this->_loaded)) {
|
||
|
$this->unload($name);
|
||
|
}
|
||
|
if ($this instanceof EventDispatcherInterface && $object instanceof EventListenerInterface) {
|
||
|
$this->getEventManager()->on($object);
|
||
|
}
|
||
|
$this->_loaded[$objName] = $object;
|
||
|
|
||
|
return $this;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Remove an object from the registry.
|
||
|
*
|
||
|
* If this registry has an event manager, the object will be detached from any events as well.
|
||
|
*
|
||
|
* @param string $name The name of the object to remove from the registry.
|
||
|
* @return $this
|
||
|
*/
|
||
|
public function unload(string $name)
|
||
|
{
|
||
|
if (empty($this->_loaded[$name])) {
|
||
|
[$plugin, $name] = pluginSplit($name);
|
||
|
$this->_throwMissingClassError($name, $plugin);
|
||
|
}
|
||
|
|
||
|
$object = $this->_loaded[$name];
|
||
|
if ($this instanceof EventDispatcherInterface && $object instanceof EventListenerInterface) {
|
||
|
$this->getEventManager()->off($object);
|
||
|
}
|
||
|
unset($this->_loaded[$name]);
|
||
|
|
||
|
return $this;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Returns an array iterator.
|
||
|
*
|
||
|
* @return \Traversable
|
||
|
* @psalm-return \Traversable<string, TObject>
|
||
|
*/
|
||
|
public function getIterator(): Traversable
|
||
|
{
|
||
|
return new ArrayIterator($this->_loaded);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Returns the number of loaded objects.
|
||
|
*
|
||
|
* @return int
|
||
|
*/
|
||
|
public function count(): int
|
||
|
{
|
||
|
return count($this->_loaded);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Debug friendly object properties.
|
||
|
*
|
||
|
* @return array<string, mixed>
|
||
|
*/
|
||
|
public function __debugInfo(): array
|
||
|
{
|
||
|
$properties = get_object_vars($this);
|
||
|
if (isset($properties['_loaded'])) {
|
||
|
$properties['_loaded'] = array_keys($properties['_loaded']);
|
||
|
}
|
||
|
|
||
|
return $properties;
|
||
|
}
|
||
|
}
|