Class ObjectRegistry
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
Namespace: Cake\Core
See: \Cake\Controller\ComponentRegistry
See: \Cake\View\HelperRegistry
See: \Cake\Console\TaskRegistry
Property Summary
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$_loaded protected
arrayMap of loaded objects.
Method Summary
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__debugInfo() public
Debug friendly object properties.
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__get() public
Provide public read access to the loaded objects
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__isset() public
Provide isset access to _loaded
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_checkDuplicate() protected
Check for duplicate object loading.
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_create() abstract protected
Create an instance of a given classname.
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_resolveClassName() abstract protected
Should resolve the classname for a given object type.
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_throwMissingClassError() abstract protected
Throw an exception when the requested object name is missing.
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get() public
Get loaded object instance.
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has() public
Check whether or not a given object is loaded.
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load() public
Loads/constructs an object instance.
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loaded() public
Get the list of loaded objects.
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normalizeArray() public
Normalizes an object array, creates an array that makes lazy loading easier
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reset() public
Clear loaded instances in the registry.
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set() public
Set an object directly into the registry by name.
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unload() public
Remove an object from the registry.
Method Detail
__get() ¶ public
__get(string $name): mixedProvide public read access to the loaded objects
Parameters
-
string$name Name of property to read
Returns
mixed__isset() ¶ public
__isset(string $name): boolProvide isset access to _loaded
Parameters
-
string$name Name of object being checked.
Returns
bool_checkDuplicate() ¶ protected
_checkDuplicate(string $name, array $config): voidCheck for duplicate object loading.
If a duplicate is being loaded and has different configuration, that is bad and an exception will be raised.
An exception is raised, as replacing the object will not update any references other objects may have. Additionally, simply updating the runtime configuration is not a good option as we may be missing important constructor logic dependent on the configuration.
Parameters
-
string$name The name of the alias in the registry.
-
array$config The config data for the new instance.
Returns
voidThrows
RuntimeExceptionWhen a duplicate is found.
_create() ¶ abstract protected
_create(string $class, string $alias, array $config): mixedCreate an instance of a given classname.
This method should construct and do any other initialization logic required.
Parameters
-
string$class The class to build.
-
string$alias The alias of the object.
-
array$config The Configuration settings for construction
Returns
mixed_resolveClassName() ¶ abstract protected
_resolveClassName(string $class): string|falseShould resolve the classname for a given object type.
Parameters
-
string$class The class to resolve.
Returns
string|false_throwMissingClassError() ¶ abstract protected
_throwMissingClassError(string $class, string $plugin): voidThrow an exception when the requested object name is missing.
Parameters
-
string$class The class that is missing.
-
string$plugin The plugin $class is missing from.
Returns
voidThrows
Exceptionget() ¶ public
get(string $name): object|nullGet loaded object instance.
Parameters
-
string$name Name of object.
Returns
object|nullhas() ¶ public
has(string $name): boolCheck whether or not a given object is loaded.
Parameters
-
string$name The object name to check for.
Returns
boolload() ¶ public
load(string $objectName, array $config = []): mixedLoads/constructs an object instance.
Will return the instance in the registry if it already exists.
If a subclass provides event support, you can use $config['enabled'] = false
to exclude constructed objects from being registered for events.
Using Cake\Controller\Controller::$components as an example. You can alias an object by setting the 'className' key, i.e.,
public $components = [
'Email' => [
'className' => '\App\Controller\Component\AliasedEmailComponent'
];
];All calls to the Email component would use AliasedEmail instead.
Parameters
-
string$objectName The name/class of the object to load.
-
array$config optional Additional settings to use when loading the object.
Returns
mixednormalizeArray() ¶ public
normalizeArray(array $objects): arrayNormalizes an object array, creates an array that makes lazy loading easier
Parameters
-
array$objects Array of child objects to normalize.
Returns
arrayreset() ¶ public
reset(): voidClear loaded instances in the registry.
If the registry subclass has an event manager, the objects will be detached from events as well.
Returns
voidset() ¶ public
set(string $objectName, object $object): voidSet an object directly into the registry by name.
If this collection implements events, the passed object will be attached into the event manager
Parameters
-
string$objectName The name of the object to set in the registry.
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object$object instance to store in the registry
Returns
voidunload() ¶ public
unload(string $objectName): voidRemove an object from the registry.
If this registry has an event manager, the object will be detached from any events as well.
Parameters
-
string$objectName The name of the object to remove from the registry.
Returns
void