Code Coverage |
||||||||||
Lines |
Functions and Methods |
Classes and Traits |
||||||||
| Total | |
100.00% |
24 / 24 |
|
100.00% |
4 / 4 |
CRAP | |
100.00% |
1 / 1 |
| ServiceProviderContainer | |
100.00% |
24 / 24 |
|
100.00% |
4 / 4 |
17 | |
100.00% |
1 / 1 |
| __construct | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
1 | |||
| has | |
100.00% |
1 / 1 |
|
100.00% |
1 / 1 |
2 | |||
| get | |
100.00% |
14 / 14 |
|
100.00% |
1 / 1 |
7 | |||
| applyServiceExtensions | |
100.00% |
8 / 8 |
|
100.00% |
1 / 1 |
7 | |||
| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * This file is part of php-fast-forward/container. |
| 7 | * |
| 8 | * This source file is subject to the license bundled |
| 9 | * with this source code in the file LICENSE. |
| 10 | * |
| 11 | * @copyright Copyright (c) 2025-2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com> |
| 12 | * @license https://opensource.org/licenses/MIT MIT License |
| 13 | * |
| 14 | * @see https://github.com/php-fast-forward/container |
| 15 | * @see https://github.com/php-fast-forward |
| 16 | * @see https://datatracker.ietf.org/doc/html/rfc2119 |
| 17 | */ |
| 18 | |
| 19 | namespace FastForward\Container; |
| 20 | |
| 21 | use FastForward\Container\Exception\ContainerException; |
| 22 | use FastForward\Container\Exception\NotFoundException; |
| 23 | use Interop\Container\ServiceProviderInterface; |
| 24 | use Psr\Container\ContainerExceptionInterface; |
| 25 | use Psr\Container\ContainerInterface as PsrContainerInterface; |
| 26 | |
| 27 | /** |
| 28 | * Implements a PSR-11 compliant dependency injection container using a container-interop/service-provider. |
| 29 | * |
| 30 | * This container SHALL resolve services by delegating to the factories and extensions defined in the |
| 31 | * provided ServiceProviderInterface instance. |
| 32 | * |
| 33 | * Services are lazily instantiated on first request and |
| 34 | * cached for subsequent retrieval, enforcing singleton-like behavior within the container scope. |
| 35 | * |
| 36 | * The container supports service extension mechanisms by allowing callable extensions to modify or |
| 37 | * enhance services after construction, based on the service identifier or its concrete class name. |
| 38 | * |
| 39 | * If an optional wrapper container is provided, it SHALL be passed to service factories and extensions, |
| 40 | * allowing for delegation or decoration of service resolution. If omitted, the container defaults to itself. |
| 41 | */ |
| 42 | class ServiceProviderContainer implements ContainerInterface |
| 43 | { |
| 44 | /** |
| 45 | * The container instance used for service resolution and extension application. |
| 46 | * |
| 47 | * This property MAY reference another container for delegation, or default to this container instance. |
| 48 | */ |
| 49 | private PsrContainerInterface $wrapperContainer; |
| 50 | |
| 51 | /** |
| 52 | * Cache of resolved services keyed by their identifier or class name. |
| 53 | * |
| 54 | * This array SHALL store already constructed services to enforce singleton-like behavior within the container scope. |
| 55 | * |
| 56 | * @var array<string, mixed> |
| 57 | */ |
| 58 | private array $cache; |
| 59 | |
| 60 | /** |
| 61 | * Constructs a new ServiceProviderContainer instance. |
| 62 | * |
| 63 | * This constructor SHALL initialize the container with a service provider and an optional delegating container. |
| 64 | * If no wrapper container is provided, the container SHALL delegate to itself. |
| 65 | * |
| 66 | * @param ServiceProviderInterface $serviceProvider the service provider supplying factories and extensions |
| 67 | * @param PsrContainerInterface|null $wrapperContainer An optional container for delegation. Defaults to self. |
| 68 | */ |
| 69 | public function __construct( |
| 70 | private ServiceProviderInterface $serviceProvider, |
| 71 | ?PsrContainerInterface $wrapperContainer = null, |
| 72 | ) { |
| 73 | $this->wrapperContainer = $wrapperContainer ?? $this; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Determines if the container can return an entry for the given identifier. |
| 78 | * |
| 79 | * This method MUST return true if the entry exists in the cache or factories, false otherwise. |
| 80 | * |
| 81 | * @param string $id identifier of the entry to look for |
| 82 | * |
| 83 | * @return bool true if the entry exists, false otherwise |
| 84 | */ |
| 85 | public function has(string $id): bool |
| 86 | { |
| 87 | return isset($this->cache[$id]) || \array_key_exists($id, $this->serviceProvider->getFactories()); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Retrieves a service from the container by its identifier. |
| 92 | * |
| 93 | * This method SHALL return a cached instance if available, otherwise it resolves |
| 94 | * the service using the factory provided by the service provider. |
| 95 | * |
| 96 | * If the service has a corresponding extension, it SHALL be applied post-construction. |
| 97 | * |
| 98 | * @param string $id the identifier of the service to retrieve |
| 99 | * |
| 100 | * @return mixed the service instance associated with the identifier |
| 101 | * |
| 102 | * @throws NotFoundException if no factory exists for the given identifier |
| 103 | * @throws ContainerException if service construction fails due to container errors |
| 104 | */ |
| 105 | public function get(string $id): mixed |
| 106 | { |
| 107 | if (isset($this->cache[$id])) { |
| 108 | return $this->cache[$id]; |
| 109 | } |
| 110 | |
| 111 | $factory = $this->serviceProvider->getFactories(); |
| 112 | |
| 113 | if (! \array_key_exists($id, $factory) || ! \is_callable($factory[$id])) { |
| 114 | throw NotFoundException::forServiceID($id); |
| 115 | } |
| 116 | |
| 117 | try { |
| 118 | $service = \call_user_func($factory[$id], $this->wrapperContainer); |
| 119 | $class = $service::class; |
| 120 | $this->applyServiceExtensions($id, $class, $service); |
| 121 | } catch (ContainerExceptionInterface $containerException) { |
| 122 | throw ContainerException::forInvalidService($id, $containerException); |
| 123 | } |
| 124 | |
| 125 | $this->cache[$id] = $service; |
| 126 | |
| 127 | if ($id !== $class && ! isset($this->cache[$class])) { |
| 128 | $this->cache[$class] = $service; |
| 129 | } |
| 130 | |
| 131 | return $service; |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Applies service extensions to the constructed service instance. |
| 136 | * |
| 137 | * This method SHALL inspect the set of extensions returned by the service provider, |
| 138 | * checking both the original service identifier and the concrete class name of the |
| 139 | * service instance. If a corresponding extension is found, it MUST be a callable and |
| 140 | * SHALL be invoked with the container and service instance as arguments. |
| 141 | * |
| 142 | * Extensions MAY be used to modify or enhance services after creation. Invalid extensions |
| 143 | * (non-callables) SHALL be ignored silently. |
| 144 | * |
| 145 | * @param string $id the identifier of the resolved service |
| 146 | * @param string $class the fully qualified class name of the service |
| 147 | * @param mixed $service the service instance to apply extensions to |
| 148 | * |
| 149 | * @return void |
| 150 | * |
| 151 | * @throws ContainerException if an extension callable fails during execution |
| 152 | */ |
| 153 | private function applyServiceExtensions(string $id, string $class, mixed $service): void |
| 154 | { |
| 155 | $extensions = $this->serviceProvider->getExtensions(); |
| 156 | |
| 157 | if (\array_key_exists($id, $extensions) && \is_callable($extensions[$id])) { |
| 158 | $extensions[$id]($this->wrapperContainer, $service); |
| 159 | } |
| 160 | |
| 161 | if ($id !== $class |
| 162 | && ! isset($this->cache[$class]) |
| 163 | && \array_key_exists($class, $extensions) |
| 164 | && \is_callable($extensions[$class]) |
| 165 | ) { |
| 166 | $extensions[$class]($this->wrapperContainer, $service); |
| 167 | } |
| 168 | } |
| 169 | } |