1048 lines
36 KiB
PHP
1048 lines
36 KiB
PHP
<?php
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namespace SilverStripe\Core\Injector;
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use ArrayObject;
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use InvalidArgumentException;
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use Psr\Container\ContainerInterface;
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use Psr\Container\NotFoundExceptionInterface;
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use ReflectionMethod;
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use ReflectionObject;
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use ReflectionProperty;
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use SilverStripe\Core\ClassInfo;
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use SilverStripe\Core\Config\Config;
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use SilverStripe\Dev\Deprecation;
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/**
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* A simple injection manager that manages creating objects and injecting
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* dependencies between them. It borrows quite a lot from ideas taken from
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* Spring's configuration, but is adapted to the stateless PHP way of doing
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* things.
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*
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* In its simplest form, the dependency injector can be used as a mechanism to
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* instantiate objects. Simply call
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*
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* Injector::inst()->get('ClassName')
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*
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* and a new instance of ClassName will be created and returned to you.
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*
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* Classes can have specific configuration defined for them to
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* indicate dependencies that should be injected. This takes the form of
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* a static variable $dependencies defined in the class (or configuration),
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* which indicates the name of a property that should be set.
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*
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* eg
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*
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* <code>
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* class MyController extends Controller {
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*
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* public $permissions;
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* public $defaultText;
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*
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* static $dependencies = array(
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* 'defaultText' => 'Override in configuration',
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* 'permissions' => '%$PermissionService',
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* );
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* }
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* </code>
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*
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* will result in an object of type MyController having the defaultText property
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* set to 'Override in configuration', and an object identified
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* as PermissionService set into the property called 'permissions'. The %$
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* syntax tells the injector to look the provided name up as an item to be created
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* by the Injector itself.
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*
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* A key concept of the injector is whether to manage the object as
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*
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* * A pseudo-singleton, in that only one item will be created for a particular
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* identifier (but the same class could be used for multiple identifiers)
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* * A prototype, where the same configuration is used, but a new object is
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* created each time
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* * unmanaged, in which case a new object is created and injected, but no
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* information about its state is managed.
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*
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* Additional configuration of items managed by the injector can be done by
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* providing configuration for the types, either by manually loading in an
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* array describing the configuration, or by specifying the configuration
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* for a type via SilverStripe's configuration mechanism.
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*
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* Specify a configuration array of the format
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*
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* <code>
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* array(
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* array(
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* 'id' => 'BeanId', // the name to be used if diff from the filename
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* 'priority' => 1, // priority. If another bean is defined with the same ID,
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* // but has a lower priority, it is NOT overridden
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* 'class' => 'ClassName', // the name of the PHP class
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* 'src' => '/path/to/file' // the location of the class
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* 'type' => 'singleton|prototype' // if you want prototype object generation, set it as the
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* // type
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* // By default, singleton is assumed
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*
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* 'factory' => 'FactoryService' // A factory service to use to create instances.
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* 'construct' => array( // properties to set at construction
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* 'scalar',
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* '%$BeanId',
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* )
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* 'properties' => array(
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* 'name' => 'value' // scalar value
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* 'name' => '%$BeanId', // a reference to another bean
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* 'name' => array(
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* 'scalar',
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* '%$BeanId'
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* )
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* )
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* )
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* // alternatively
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* 'MyBean' => array(
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* 'class' => 'ClassName',
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* )
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* // or simply
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* 'OtherBean' => 'SomeClass',
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* )
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* </code>
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*
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* In addition to specifying the bindings directly in the configuration,
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* you can simply create a publicly accessible property on the target
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* class which will automatically be injected if the autoScanProperties
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* option is set to true. This means a class defined as
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*
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* <code>
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* class MyController extends Controller {
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*
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* private $permissionService;
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*
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* public setPermissionService($p) {
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* $this->permissionService = $p;
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* }
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* }
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* </code>
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*
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* will have setPermissionService called if
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*
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* * Injector::inst()->setAutoScanProperties(true) is called and
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* * A service named 'PermissionService' has been configured
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*
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* @author marcus@silverstripe.com.au
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* @license BSD License http://silverstripe.org/bsd-license/
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*/
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class Injector implements ContainerInterface
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{
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/**
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* Local store of all services
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*
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* @var array
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*/
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private $serviceCache;
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/**
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* Cache of items that need to be mapped for each service that gets injected
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*
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* @var array
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*/
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private $injectMap;
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/**
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* A store of all the service configurations that have been defined.
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*
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* @var array
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*/
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private $specs;
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/**
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* A map of all the properties that should be automagically set on all
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* objects instantiated by the injector
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*/
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private $autoProperties;
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/**
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* A singleton if you want to use it that way
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*
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* @var Injector
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*/
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private static $instance;
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/**
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* Indicates whether or not to automatically scan properties in injected objects to auto inject
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* stuff, similar to the way grails does things.
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*
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* @var boolean
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*/
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private $autoScanProperties = false;
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/**
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* The default factory used to create new instances.
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*
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* The {@link InjectionCreator} is used by default, which simply directly
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* creates objects. This can be changed to use a different default creation
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* method if desired.
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*
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* Each individual component can also specify a custom factory to use by
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* using the `factory` parameter.
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*
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* @var Factory
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*/
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protected $objectCreator;
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/**
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* Locator for determining Config properties for services
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*
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* @var ServiceConfigurationLocator
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*/
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protected $configLocator;
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/**
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* Create a new injector.
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*
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* @param array $config
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* Service configuration
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*/
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public function __construct($config = null)
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{
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$this->injectMap = array();
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$this->serviceCache = array(
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'Injector' => $this,
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);
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$this->specs = [
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'Injector' => ['class' => static::class]
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];
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$this->autoProperties = array();
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$creatorClass = isset($config['creator'])
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? $config['creator']
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: InjectionCreator::class;
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$locatorClass = isset($config['locator'])
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? $config['locator']
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: SilverStripeServiceConfigurationLocator::class;
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$this->objectCreator = new $creatorClass;
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$this->configLocator = new $locatorClass;
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if ($config) {
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$this->load($config);
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}
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}
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/**
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* The injector instance this one was copied from when Injector::nest() was called.
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*
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* @var Injector
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*/
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protected $nestedFrom = null;
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/**
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* @return Injector
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*/
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public static function inst()
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{
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return InjectorLoader::inst()->getManifest();
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}
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/**
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* Make the newly active {@link Injector} be a copy of the current active
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* {@link Injector} instance.
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*
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* You can then make changes to the injector with methods such as
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* {@link Injector::inst()->registerService()} which will be discarded
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* upon a subsequent call to {@link Injector::unnest()}
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*
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* @return Injector Reference to new active Injector instance
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*/
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public static function nest()
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{
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// Clone current injector and nest
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$new = clone self::inst();
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InjectorLoader::inst()->pushManifest($new);
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return $new;
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}
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/**
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* Change the active Injector back to the Injector instance the current active
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* Injector object was copied from.
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*
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* @return Injector Reference to restored active Injector instance
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*/
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public static function unnest()
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{
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// Unnest unless we would be left at 0 manifests
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$loader = InjectorLoader::inst();
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if ($loader->countManifests() <= 1) {
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user_error(
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"Unable to unnest root Injector, please make sure you don't have mis-matched nest/unnest",
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E_USER_WARNING
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);
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} else {
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$loader->popManifest();
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}
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return static::inst();
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}
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/**
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* Indicate whether we auto scan injected objects for properties to set.
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*
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* @param boolean $val
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*/
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public function setAutoScanProperties($val)
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{
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$this->autoScanProperties = $val;
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}
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/**
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* Sets the default factory to use for creating new objects.
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*
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* @param \SilverStripe\Core\Injector\Factory $obj
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*/
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public function setObjectCreator(Factory $obj)
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{
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$this->objectCreator = $obj;
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}
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/**
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* @return Factory
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*/
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public function getObjectCreator()
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{
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return $this->objectCreator;
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}
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/**
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* Set the configuration locator
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* @param ServiceConfigurationLocator $configLocator
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*/
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public function setConfigLocator($configLocator)
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{
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$this->configLocator = $configLocator;
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}
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/**
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* Retrieve the configuration locator
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* @return ServiceConfigurationLocator
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*/
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public function getConfigLocator()
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{
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return $this->configLocator;
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}
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/**
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* Add in a specific mapping that should be catered for on a type.
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* This allows configuration of what should occur when an object
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* of a particular type is injected, and what items should be injected
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* for those properties / methods.
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*
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* @param string $class The class to set a mapping for
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* @param string $property The property to set the mapping for
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* @param string $toInject The registered type that will be injected
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* @param string $injectVia Whether to inject by setting a property or calling a setter
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*/
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public function setInjectMapping($class, $property, $toInject, $injectVia = 'property')
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{
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$mapping = isset($this->injectMap[$class]) ? $this->injectMap[$class] : array();
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$mapping[$property] = array('name' => $toInject, 'type' => $injectVia);
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$this->injectMap[$class] = $mapping;
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}
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/**
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* Add an object that should be automatically set on managed objects
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*
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* This allows you to specify, for example, that EVERY managed object
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* will be automatically inject with a log object by the following
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*
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* $injector->addAutoProperty('log', new Logger());
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*
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* @param string $property
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* the name of the property
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* @param object $object
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* the object to be set
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* @return $this
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*/
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public function addAutoProperty($property, $object)
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{
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$this->autoProperties[$property] = $object;
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return $this;
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}
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/**
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* Load services using the passed in configuration for those services
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*
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* @param array $config
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* @return $this
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*/
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public function load($config = array())
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{
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foreach ($config as $specId => $spec) {
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if (is_string($spec)) {
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$spec = array('class' => $spec);
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}
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$file = isset($spec['src']) ? $spec['src'] : null;
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// class is whatever's explicitly set,
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$class = isset($spec['class']) ? $spec['class'] : null;
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// or the specid if nothing else available.
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if (!$class && is_string($specId)) {
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$class = $specId;
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}
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// make sure the class is set...
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if (empty($class)) {
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throw new InvalidArgumentException('Missing spec class');
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}
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$spec['class'] = $class;
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$id = is_string($specId)
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? $specId
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: (isset($spec['id']) ? $spec['id'] : $class);
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$priority = isset($spec['priority']) ? $spec['priority'] : 1;
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// see if we already have this defined. If so, check priority weighting
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if (isset($this->specs[$id]) && isset($this->specs[$id]['priority'])) {
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if ($this->specs[$id]['priority'] > $priority) {
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return $this;
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}
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}
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// okay, actually include it now we know we're going to use it
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if (file_exists($file)) {
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require_once $file;
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}
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// make sure to set the id for later when instantiating
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// to ensure we get cached
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$spec['id'] = $id;
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// We've removed this check because new functionality means that the 'class' field doesn't need to refer
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// specifically to a class anymore - it could be a compound statement, ala SilverStripe's old Object::create
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// functionality
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//
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// if (!class_exists($class)) {
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// throw new Exception("Failed to load '$class' from $file");
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// }
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// store the specs for now - we lazy load on demand later on.
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$this->specs[$id] = $spec;
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// EXCEPT when there's already an existing instance at this id.
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// if so, we need to instantiate and replace immediately
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if (isset($this->serviceCache[$id])) {
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$this->updateSpecConstructor($spec);
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$this->instantiate($spec, $id);
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}
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}
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return $this;
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}
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/**
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* Update the configuration of an already defined service
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*
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* Use this if you don't want to register a complete new config, just append
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* to an existing configuration. Helpful to avoid overwriting someone else's changes
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*
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* updateSpec('RequestProcessor', 'filters', '%$MyFilter')
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*
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* @param string $id
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* The name of the service to update the definition for
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* @param string $property
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* The name of the property to update.
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* @param mixed $value
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* The value to set
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* @param boolean $append
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* Whether to append (the default) when the property is an array
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*/
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public function updateSpec($id, $property, $value, $append = true)
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{
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if (isset($this->specs[$id]['properties'][$property])) {
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// by ref so we're updating the actual value
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$current = &$this->specs[$id]['properties'][$property];
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if (is_array($current) && $append) {
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$current[] = $value;
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} else {
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$this->specs[$id]['properties'][$property] = $value;
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}
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// and reload the object; existing bindings don't get
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// updated though! (for now...)
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if (isset($this->serviceCache[$id])) {
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$this->instantiate(array('class'=>$id), $id);
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}
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}
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}
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/**
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* Update a class specification to convert constructor configuration information if needed
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*
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* We do this as a separate process to avoid unneeded calls to convertServiceProperty
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*
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* @param array $spec
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* The class specification to update
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*/
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protected function updateSpecConstructor(&$spec)
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{
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if (isset($spec['constructor'])) {
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$spec['constructor'] = $this->convertServiceProperty($spec['constructor']);
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}
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}
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/**
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* Recursively convert a value into its proper representation with service references
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* resolved to actual objects
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*
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* @param string $value
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* @return array|mixed|string
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*/
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public function convertServiceProperty($value)
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{
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if (is_array($value)) {
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$newVal = array();
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foreach ($value as $k => $v) {
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$newVal[$k] = $this->convertServiceProperty($v);
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}
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return $newVal;
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}
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// Evaluate service references
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if (is_string($value) && strpos($value, '%$') === 0) {
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$id = substr($value, 2);
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return $this->get($id);
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}
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// Evaluate constants surrounded by back ticks
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if (preg_match('/^`(?<name>[^`]+)`$/', $value, $matches)) {
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if (getenv($matches['name']) !== false) {
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$value = getenv($matches['name']);
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} elseif (defined($matches['name'])) {
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$value = constant($matches['name']);
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} else {
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$value = null;
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}
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}
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return $value;
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}
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/**
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* Instantiate a managed object
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*
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* Given a specification of the form
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*
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* array(
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* 'class' => 'ClassName',
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* 'properties' => array('property' => 'scalar', 'other' => '%$BeanRef')
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* 'id' => 'ServiceId',
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* 'type' => 'singleton|prototype'
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* )
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*
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* will create a new object, store it in the service registry, and
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* set any relevant properties
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*
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* Optionally, you can pass a class name directly for creation
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*
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* To access this from the outside, you should call ->get('Name') to ensure
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* the appropriate checks are made on the specific type.
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*
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*
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* @param array $spec
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* The specification of the class to instantiate
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* @param string $id
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* The name of the object being created. If not supplied, then the id will be inferred from the
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* object being created
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* @param string $type
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* Whether to create as a singleton or prototype object. Allows code to be explicit as to how it
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* wants the object to be returned
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* @return object
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*/
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protected function instantiate($spec, $id = null, $type = null)
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{
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if (is_string($spec)) {
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$spec = array('class' => $spec);
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}
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$class = $spec['class'];
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// create the object, using any constructor bindings
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|
$constructorParams = array();
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if (isset($spec['constructor']) && is_array($spec['constructor'])) {
|
|
$constructorParams = $spec['constructor'];
|
|
}
|
|
|
|
$factory = isset($spec['factory']) ? $this->get($spec['factory']) : $this->getObjectCreator();
|
|
$object = $factory->create($class, $constructorParams);
|
|
|
|
// figure out if we have a specific id set or not. In some cases, we might be instantiating objects
|
|
// that we don't manage directly; we don't want to store these in the service cache below
|
|
if (!$id) {
|
|
$id = isset($spec['id']) ? $spec['id'] : null;
|
|
}
|
|
|
|
// now set the service in place if needbe. This is NOT done for prototype beans, as they're
|
|
// created anew each time
|
|
if (!$type) {
|
|
$type = isset($spec['type']) ? $spec['type'] : null;
|
|
}
|
|
|
|
if ($id && (!$type || $type != 'prototype')) {
|
|
// this ABSOLUTELY must be set before the object is injected.
|
|
// This prevents circular reference errors down the line
|
|
$this->serviceCache[$id] = $object;
|
|
}
|
|
|
|
// now inject safely
|
|
$this->inject($object, $id);
|
|
|
|
return $object;
|
|
}
|
|
|
|
/**
|
|
* Inject $object with available objects from the service cache
|
|
*
|
|
* @todo Track all the existing objects that have had a service bound
|
|
* into them, so we can update that binding at a later point if needbe (ie
|
|
* if the managed service changes)
|
|
*
|
|
* @param object $object
|
|
* The object to inject
|
|
* @param string $asType
|
|
* The ID this item was loaded as. This is so that the property configuration
|
|
* for a type is referenced correctly in case $object is no longer the same
|
|
* type as the loaded config specification had it as.
|
|
*/
|
|
public function inject($object, $asType = null)
|
|
{
|
|
$objtype = $asType ? $asType : get_class($object);
|
|
$mapping = isset($this->injectMap[$objtype]) ? $this->injectMap[$objtype] : null;
|
|
|
|
$spec = empty($this->specs[$objtype]) ? array() : $this->specs[$objtype];
|
|
|
|
// first off, set any properties defined in the service specification for this
|
|
// object type
|
|
if (!empty($spec['properties']) && is_array($spec['properties'])) {
|
|
foreach ($this->specs[$objtype]['properties'] as $key => $value) {
|
|
$val = $this->convertServiceProperty($value);
|
|
$this->setObjectProperty($object, $key, $val);
|
|
}
|
|
}
|
|
|
|
// Populate named methods
|
|
if (!empty($spec['calls']) && is_array($spec['calls'])) {
|
|
foreach ($spec['calls'] as $method) {
|
|
// Ignore any blank entries from the array; these may be left in due to config system limitations
|
|
if (!$method) {
|
|
continue;
|
|
}
|
|
|
|
// Format validation
|
|
if (!is_array($method) || !isset($method[0]) || isset($method[2])) {
|
|
throw new InvalidArgumentException(
|
|
"'calls' entries in service definition should be 1 or 2 element arrays."
|
|
);
|
|
}
|
|
if (!is_string($method[0])) {
|
|
throw new InvalidArgumentException("1st element of a 'calls' entry should be a string");
|
|
}
|
|
if (isset($method[1]) && !is_array($method[1])) {
|
|
throw new InvalidArgumentException("2nd element of a 'calls' entry should an arguments array");
|
|
}
|
|
|
|
// Check that the method exists and is callable
|
|
$objectMethod = array($object, $method[0]);
|
|
if (!is_callable($objectMethod)) {
|
|
throw new InvalidArgumentException("'$method[0]' in 'calls' entry is not a public method");
|
|
}
|
|
|
|
// Call it
|
|
call_user_func_array(
|
|
$objectMethod,
|
|
$this->convertServiceProperty(
|
|
isset($method[1]) ? $method[1] : array()
|
|
)
|
|
);
|
|
}
|
|
}
|
|
|
|
// now, use any cached information about what properties this object type has
|
|
// and set based on name resolution
|
|
if (!$mapping) {
|
|
if ($this->autoScanProperties) {
|
|
// we use an object to prevent array copies if/when passed around
|
|
$mapping = new ArrayObject();
|
|
|
|
// This performs public variable based injection
|
|
$robj = new ReflectionObject($object);
|
|
$properties = $robj->getProperties();
|
|
|
|
foreach ($properties as $propertyObject) {
|
|
/* @var $propertyObject ReflectionProperty */
|
|
if ($propertyObject->isPublic() && !$propertyObject->getValue($object)) {
|
|
$origName = $propertyObject->getName();
|
|
$name = ucfirst($origName);
|
|
if ($this->has($name)) {
|
|
// Pull the name out of the registry
|
|
$value = $this->get($name);
|
|
$propertyObject->setValue($object, $value);
|
|
$mapping[$origName] = array('name' => $name, 'type' => 'property');
|
|
}
|
|
}
|
|
}
|
|
|
|
// and this performs setter based injection
|
|
$methods = $robj->getMethods(ReflectionMethod::IS_PUBLIC);
|
|
|
|
foreach ($methods as $methodObj) {
|
|
/* @var $methodObj ReflectionMethod */
|
|
$methName = $methodObj->getName();
|
|
if (strpos($methName, 'set') === 0) {
|
|
$pname = substr($methName, 3);
|
|
if ($this->has($pname)) {
|
|
// Pull the name out of the registry
|
|
$value = $this->get($pname);
|
|
$methodObj->invoke($object, $value);
|
|
$mapping[$methName] = array('name' => $pname, 'type' => 'method');
|
|
}
|
|
}
|
|
}
|
|
|
|
// we store the information about what needs to be injected for objects of this
|
|
// type here
|
|
$this->injectMap[get_class($object)] = $mapping;
|
|
}
|
|
} else {
|
|
foreach ($mapping as $prop => $spec) {
|
|
if ($spec['type'] == 'property') {
|
|
$value = $this->get($spec['name']);
|
|
$object->$prop = $value;
|
|
} else {
|
|
$method = $prop;
|
|
$value = $this->get($spec['name']);
|
|
$object->$method($value);
|
|
}
|
|
}
|
|
}
|
|
|
|
$injections = Config::inst()->get(get_class($object), 'dependencies');
|
|
// If the type defines some injections, set them here
|
|
if ($injections && count($injections)) {
|
|
foreach ($injections as $property => $value) {
|
|
// we're checking empty in case it already has a property at this name
|
|
// this doesn't catch privately set things, but they will only be set by a setter method,
|
|
// which should be responsible for preventing further setting if it doesn't want it.
|
|
if (empty($object->$property)) {
|
|
$value = $this->convertServiceProperty($value);
|
|
$this->setObjectProperty($object, $property, $value);
|
|
}
|
|
}
|
|
}
|
|
|
|
foreach ($this->autoProperties as $property => $value) {
|
|
if (!isset($object->$property)) {
|
|
$value = $this->convertServiceProperty($value);
|
|
$this->setObjectProperty($object, $property, $value);
|
|
}
|
|
}
|
|
|
|
// Call the 'injected' method if it exists
|
|
if (method_exists($object, 'injected')) {
|
|
$object->injected();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Helper to set a property's value
|
|
*
|
|
* @param object $object
|
|
* Set an object's property to a specific value
|
|
* @param string $name
|
|
* The name of the property to set
|
|
* @param mixed $value
|
|
* The value to set
|
|
*/
|
|
protected function setObjectProperty($object, $name, $value)
|
|
{
|
|
if (method_exists($object, 'set'.$name)) {
|
|
$object->{'set'.$name}($value);
|
|
} else {
|
|
$object->$name = $value;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @deprecated 4.0.0:5.0.0 Use Injector::has() instead
|
|
* @param $name
|
|
* @return string
|
|
*/
|
|
public function hasService($name)
|
|
{
|
|
Deprecation::notice('5.0', 'Use Injector::has() instead');
|
|
|
|
return $this->has($name);
|
|
}
|
|
|
|
/**
|
|
* Does the given service exist?
|
|
*
|
|
* We do a special check here for services that are using compound names. For example,
|
|
* we might want to say that a property should be injected with Log.File or Log.Memory,
|
|
* but have only registered a 'Log' service, we'll instead return that.
|
|
*
|
|
* Will recursively call itself for each depth of dotting.
|
|
*
|
|
* @param string $name
|
|
* @return boolean
|
|
*/
|
|
public function has($name)
|
|
{
|
|
return (bool)$this->getServiceName($name);
|
|
}
|
|
|
|
/**
|
|
* Does the given service exist, and if so, what's the stored name for it?
|
|
*
|
|
* We do a special check here for services that are using compound names. For example,
|
|
* we might want to say that a property should be injected with Log.File or Log.Memory,
|
|
* but have only registered a 'Log' service, we'll instead return that.
|
|
*
|
|
* Will recursively call itself for each depth of dotting.
|
|
*
|
|
* @param string $name
|
|
* @return string|null The name of the service (as it might be different from the one passed in)
|
|
*/
|
|
public function getServiceName($name)
|
|
{
|
|
// common case, get it overwith first
|
|
if (isset($this->specs[$name])) {
|
|
return $name;
|
|
}
|
|
|
|
// okay, check whether we've got a compound name - don't worry about 0 index, cause that's an
|
|
// invalid name
|
|
if (!strpos($name, '.')) {
|
|
return null;
|
|
}
|
|
|
|
return $this->getServiceName(substr($name, 0, strrpos($name, '.')));
|
|
}
|
|
|
|
/**
|
|
* Register a service object with an optional name to register it as the
|
|
* service for
|
|
*
|
|
* @param object $service The object to register
|
|
* @param string $replace The name of the object to replace (if different to the
|
|
* class name of the object to register)
|
|
* @return $this
|
|
*/
|
|
public function registerService($service, $replace = null)
|
|
{
|
|
$registerAt = get_class($service);
|
|
if ($replace !== null) {
|
|
$registerAt = $replace;
|
|
}
|
|
|
|
$this->specs[$registerAt] = array('class' => get_class($service));
|
|
$this->serviceCache[$registerAt] = $service;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Removes a named object from the cached list of objects managed
|
|
* by the inject
|
|
*
|
|
* @param string $name The name to unregister
|
|
* @return $this
|
|
*/
|
|
public function unregisterNamedObject($name)
|
|
{
|
|
unset($this->serviceCache[$name]);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Clear out objects of one or more types that are managed by the injetor.
|
|
*
|
|
* @param array|string $types Base class of object (not service name) to remove
|
|
* @return $this
|
|
*/
|
|
public function unregisterObjects($types)
|
|
{
|
|
if (!is_array($types)) {
|
|
$types = [ $types ];
|
|
}
|
|
|
|
// Filter all objects
|
|
foreach ($this->serviceCache as $key => $object) {
|
|
foreach ($types as $filterClass) {
|
|
// Prevent destructive flushing
|
|
if (strcasecmp($filterClass, 'object') === 0) {
|
|
throw new InvalidArgumentException("Global unregistration is not allowed");
|
|
}
|
|
if ($object instanceof $filterClass) {
|
|
unset($this->serviceCache[$key]);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Get a named managed object
|
|
*
|
|
* Will first check to see if the item has been registered as a configured service/bean
|
|
* and return that if so.
|
|
*
|
|
* Next, will check to see if there's any registered configuration for the given type
|
|
* and will then try and load that
|
|
*
|
|
* Failing all of that, will just return a new instance of the specified object.
|
|
*
|
|
* @throws NotFoundExceptionInterface No entry was found for **this** identifier.
|
|
*
|
|
* @param string $name The name of the service to retrieve. If not a registered
|
|
* service, then a class of the given name is instantiated
|
|
* @param boolean $asSingleton Whether to register the created object as a singleton
|
|
* if no other configuration is found
|
|
* @param array $constructorArgs Optional set of arguments to pass as constructor arguments
|
|
* if this object is to be created from scratch (with $asSingleton = false)
|
|
* @return mixed Instance of the specified object
|
|
*/
|
|
public function get($name, $asSingleton = true, $constructorArgs = [])
|
|
{
|
|
$object = $this->getNamedService($name, $asSingleton, $constructorArgs);
|
|
|
|
if (!$object) {
|
|
throw new InjectorNotFoundException("The '{$name}' service could not be found");
|
|
}
|
|
|
|
return $object;
|
|
}
|
|
|
|
/**
|
|
* Returns the service, or `null` if it doesnt' exist. See {@link get()} for main usage.
|
|
*
|
|
* @param string $name
|
|
* @param boolean $asSingleton
|
|
* @param array $constructorArgs
|
|
* @return mixed|null Instance of the specified object (if it exists)
|
|
*/
|
|
protected function getNamedService($name, $asSingleton = true, $constructorArgs = [])
|
|
{
|
|
// Normalise service / args
|
|
list($name, $constructorArgs) = $this->normaliseArguments($name, $constructorArgs);
|
|
|
|
// reassign the name as it might actually be a compound name
|
|
if ($serviceName = $this->getServiceName($name)) {
|
|
// check to see what the type of bean is. If it's a prototype,
|
|
// we don't want to return the singleton version of it.
|
|
$spec = $this->specs[$serviceName];
|
|
$type = isset($spec['type']) ? $spec['type'] : null;
|
|
// if we're explicitly a prototype OR we're not wanting a singleton
|
|
if (($type && $type == 'prototype') || !$asSingleton) {
|
|
if ($spec && $constructorArgs) {
|
|
$spec['constructor'] = $constructorArgs;
|
|
} else {
|
|
// convert any _configured_ constructor args.
|
|
// we don't call this for get() calls where someone passes in
|
|
// constructor args, otherwise we end up calling convertServiceParams
|
|
// way too often
|
|
$this->updateSpecConstructor($spec);
|
|
}
|
|
return $this->instantiate($spec, $serviceName, !$type ? 'prototype' : $type);
|
|
} else {
|
|
if (!isset($this->serviceCache[$serviceName])) {
|
|
$this->updateSpecConstructor($spec);
|
|
$this->instantiate($spec, $serviceName);
|
|
}
|
|
return $this->serviceCache[$serviceName];
|
|
}
|
|
}
|
|
$config = $this->configLocator->locateConfigFor($name);
|
|
if ($config) {
|
|
$this->load(array($name => $config));
|
|
if (isset($this->specs[$name])) {
|
|
$spec = $this->specs[$name];
|
|
$this->updateSpecConstructor($spec);
|
|
if ($constructorArgs) {
|
|
$spec['constructor'] = $constructorArgs;
|
|
}
|
|
return $this->instantiate($spec, $name);
|
|
}
|
|
}
|
|
// If we've got this far, we're dealing with a case of a user wanting
|
|
// to create an object based on its name. So, we need to fake its config
|
|
// if the user wants it managed as a singleton service style object
|
|
$spec = array('class' => $name, 'constructor' => $constructorArgs);
|
|
if ($asSingleton) {
|
|
// need to load the spec in; it'll be given the singleton type by default
|
|
$this->load(array($name => $spec));
|
|
return $this->instantiate($spec, $name);
|
|
}
|
|
|
|
return $this->instantiate($spec);
|
|
}
|
|
|
|
/**
|
|
* Detect service references with constructor arguments included.
|
|
* These will be split out of the service name reference and appended
|
|
* to the $args
|
|
*
|
|
* @param string $name
|
|
* @param array $args
|
|
* @return array Two items with name and new args
|
|
*/
|
|
protected function normaliseArguments($name, $args = [])
|
|
{
|
|
if (strstr($name, '(')) {
|
|
list($name, $extraArgs) = ClassInfo::parse_class_spec($name);
|
|
if ($args) {
|
|
$args = array_merge($args, $extraArgs);
|
|
} else {
|
|
$args = $extraArgs;
|
|
}
|
|
}
|
|
return [ $name, $args ];
|
|
}
|
|
|
|
/**
|
|
* Magic method to return an item directly
|
|
*
|
|
* @param string $name
|
|
* The named object to retrieve
|
|
* @return mixed
|
|
*/
|
|
public function __get($name)
|
|
{
|
|
return $this->get($name);
|
|
}
|
|
|
|
/**
|
|
* Similar to get() but always returns a new object of the given type
|
|
*
|
|
* Additional parameters are passed through as
|
|
*
|
|
* @param string $name
|
|
* @param mixed $argument,... arguments to pass to the constructor
|
|
* @return mixed A new instance of the specified object
|
|
*/
|
|
public function create($name, $argument = null)
|
|
{
|
|
$constructorArgs = func_get_args();
|
|
array_shift($constructorArgs);
|
|
return $this->createWithArgs($name, $constructorArgs);
|
|
}
|
|
|
|
/**
|
|
* Creates an object with the supplied argument array
|
|
*
|
|
* @param string $name Name of the class to create an object of
|
|
* @param array $constructorArgs Arguments to pass to the constructor
|
|
* @return mixed
|
|
*/
|
|
public function createWithArgs($name, $constructorArgs)
|
|
{
|
|
return $this->get($name, false, $constructorArgs);
|
|
}
|
|
}
|