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

Abstract
Namespace: Cake\Core

Properties summary

  • $_loaded protected
    object[]

    Map of loaded objects.

Method Summary

  • __debugInfo() public

    Debug friendly object properties.

  • __get() public

    Provide public read access to the loaded objects

  • __isset() public

    Provide isset access to _loaded

  • __set() public

    Sets an object.

  • __unset() public

    Unsets an object.

  • _checkDuplicate() protected

    Check for duplicate object loading.

  • _create() abstract protected

    Create an instance of a given classname.

  • _resolveClassName() abstract protected

    Should resolve the classname for a given object type.

  • _throwMissingClassError() abstract protected

    Throw an exception when the requested object name is missing.

  • count() public

    Returns the number of loaded objects.

  • get() public

    Get loaded object instance.

  • getIterator() public

    Returns an array iterator.

  • has() public

    Check whether or not a given object is loaded.

  • load() public

    Loads/constructs an object instance.

  • loaded() public

    Get the list of loaded objects.

  • normalizeArray() public

    Normalizes an object array, creates an array that makes lazy loading easier

  • reset() public

    Clear loaded instances in the registry.

  • set() public

    Set an object directly into the registry by name.

  • unload() public

    Remove an object from the registry.

Method Detail

__debugInfo() public 

__debugInfo()

Debug friendly object properties.

Returns

array

__get() public 

__get(string $name)

Provide public read access to the loaded objects

Parameters

string $name

Name of property to read

Returns

object|null

__isset() public 

__isset(string $name)

Provide isset access to _loaded

Parameters

string $name

Name of object being checked.

Returns

bool

__set() public 

__set(string $name, mixed $object)

Sets an object.

Parameters

string $name

Name of a property to set.

object $object

Object to set.

__unset() public 

__unset(string $name)

Unsets an object.

Parameters

string $name

Name of a property to unset.

_checkDuplicate() protected 

_checkDuplicate(string $name, array $config)

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.

Parameters

string $name

The name of the alias in the registry.

array $config

The config data for the new instance.

Throws

RuntimeException
When a duplicate is found.

_create() abstract protected 

_create(mixed $class, string $alias, array $config)

Create an instance of a given classname.

This method should construct and do any other initialization logic required.

Parameters

string|object $class

The class to build.

string $alias

The alias of the object.

array $config

The Configuration settings for construction

Returns

object

_resolveClassName() abstract protected 

_resolveClassName(string $class)

Should resolve the classname for a given object type.

Parameters

string $class

The class to resolve.

Returns

string|null

The resolved name or null for failure.

_throwMissingClassError() abstract protected 

_throwMissingClassError(string $class, ?string $plugin)

Throw an exception when the requested object name is missing.

Parameters

string $class

The class that is missing.

string|null $plugin

The plugin $class is missing from.

Throws

Exception

count() public 

count()

Returns the number of loaded objects.

Returns

int

get() public 

get(string $name)

Get loaded object instance.

Parameters

string $name

Name of object.

Returns

object

Object instance.

Throws

RuntimeException
If not loaded or found.

getIterator() public 

getIterator()

Returns an array iterator.

Returns

\Traversable

has() public 

has(string $name)

Check whether or not a given object is loaded.

Parameters

string $name

The object name to check for.

Returns

bool

True is object is loaded else false.

load() public 

load(string $objectName, array $config)

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 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

mixed

Throws

Exception
If the class cannot be found.

loaded() public 

loaded()

Get the list of loaded objects.

Returns

string[]

List of object names.

normalizeArray() public 

normalizeArray(array $objects)

Normalizes an object array, creates an array that makes lazy loading easier

Parameters

array $objects

Array of child objects to normalize.

Returns

array[]

Array of normalized objects.

reset() public 

reset()

Clear loaded instances in the registry.

If the registry subclass has an event manager, the objects will be detached from events as well.

Returns

$this

set() public 

set(string $objectName, object $object)

Set 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.

object $object

instance to store in the registry

Returns

$this

unload() public 

unload(string $objectName)

Remove 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

$this

Property Detail

$_loaded protected

Map of loaded objects.

Type

object[]

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https://api.cakephp.org/4.1/class-Cake.Core.ObjectRegistry.html