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| 1 | <?php |
| 2 | /** |
| 3 | * Pop PHP Framework (https://www.popphp.org/) |
| 4 | * |
| 5 | * @link https://github.com/popphp/popphp-framework |
| 6 | * @author Nick Sagona, III <dev@noladev.com> |
| 7 | * @copyright Copyright (c) 2009-2026 NOLA Interactive, LLC. |
| 8 | * @license https://www.popphp.org/license New BSD License |
| 9 | */ |
| 10 | |
| 11 | /** |
| 12 | * @namespace |
| 13 | */ |
| 14 | namespace Pop\Service; |
| 15 | |
| 16 | use Pop\AbstractManager; |
| 17 | use Pop\Utils\CallableObject; |
| 18 | |
| 19 | /** |
| 20 | * Service locator class |
| 21 | * |
| 22 | * @category Pop |
| 23 | * @package Pop\Service |
| 24 | * @author Nick Sagona, III <dev@noladev.com> |
| 25 | * @copyright Copyright (c) 2009-2026 NOLA Interactive, LLC. |
| 26 | * @license https://www.popphp.org/license New BSD License |
| 27 | * @version 4.4.0 |
| 28 | */ |
| 29 | class Locator extends AbstractManager |
| 30 | { |
| 31 | |
| 32 | /** |
| 33 | * Recursion depth level tracker |
| 34 | * @var int |
| 35 | */ |
| 36 | private static int $depth = 0; |
| 37 | |
| 38 | /** |
| 39 | * Recursion called service name tracker |
| 40 | * @var array |
| 41 | */ |
| 42 | private static array $called = []; |
| 43 | |
| 44 | /** |
| 45 | * Services that are loaded/instantiated |
| 46 | * @var array |
| 47 | */ |
| 48 | protected array $loaded = []; |
| 49 | |
| 50 | /** |
| 51 | * Constructor |
| 52 | * |
| 53 | * Instantiate the service locator object. |
| 54 | * |
| 55 | * @param ?array $services |
| 56 | * @param bool $default |
| 57 | * @throws Exception |
| 58 | */ |
| 59 | public function __construct(?array $services = null, bool $default = true) |
| 60 | { |
| 61 | if ($services !== null) { |
| 62 | $this->setServices($services); |
| 63 | } |
| 64 | |
| 65 | if (($default) && !(Container::has('default'))) { |
| 66 | Container::set('default', $this); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Set service objects from an array of services |
| 72 | * |
| 73 | * @param array $services |
| 74 | * @throws Exception |
| 75 | * @return static |
| 76 | */ |
| 77 | public function setServices(array $services): static |
| 78 | { |
| 79 | foreach ($services as $name => $service) { |
| 80 | $this->set($name, $service); |
| 81 | } |
| 82 | |
| 83 | return $this; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Set a service. It will overwrite any previous service with the same name. |
| 88 | * |
| 89 | * A service can be a CallableObject, callable string, or an array that |
| 90 | * contains a 'call' key and an optional 'params' key. |
| 91 | * Valid callable strings are: |
| 92 | * |
| 93 | * 'someFunction' |
| 94 | * 'SomeClass' |
| 95 | * 'SomeClass->foo' |
| 96 | * 'SomeClass::bar' |
| 97 | * |
| 98 | * @param string $name |
| 99 | * @param mixed $service |
| 100 | * @throws Exception |
| 101 | * @return static |
| 102 | */ |
| 103 | public function set(string $name, mixed $service): static |
| 104 | { |
| 105 | if (!($service instanceof CallableObject)) { |
| 106 | $call = null; |
| 107 | $params = null; |
| 108 | |
| 109 | if (!is_array($service)) { |
| 110 | $call = $service; |
| 111 | } else if (isset($service['call'])) { |
| 112 | $call = $service['call']; |
| 113 | $params = $service['params'] ?? null; |
| 114 | } |
| 115 | |
| 116 | if ($call === null) { |
| 117 | throw new Exception('Error: A callable service was not passed'); |
| 118 | } |
| 119 | |
| 120 | $this->items[$name] = new CallableObject($call, $params); |
| 121 | } else { |
| 122 | $this->items[$name] = $service; |
| 123 | } |
| 124 | |
| 125 | return $this; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Get/load a service |
| 130 | * |
| 131 | * @param string $name |
| 132 | * @throws Exception |
| 133 | * @return mixed |
| 134 | */ |
| 135 | public function get(string $name): mixed |
| 136 | { |
| 137 | if (!isset($this->items[$name])) { |
| 138 | throw new Exception("Error: The service '" . $name . "' has not been added to the service locator"); |
| 139 | } |
| 140 | if (!isset($this->loaded[$name])) { |
| 141 | if (self::$depth > 40) { |
| 142 | throw new Exception( |
| 143 | 'Error: Possible recursion loop detected when attempting to load these services: ' . |
| 144 | implode(', ', self::$called) |
| 145 | ); |
| 146 | } |
| 147 | |
| 148 | // Keep track of the called services |
| 149 | self::$depth++; |
| 150 | if (!in_array($name, self::$called)) { |
| 151 | self::$called[] = $name; |
| 152 | } |
| 153 | |
| 154 | $this->loaded[$name] = $this->items[$name]->call(); |
| 155 | self::$depth--; |
| 156 | } |
| 157 | |
| 158 | return $this->loaded[$name]; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Get a service's callable string or object |
| 163 | * |
| 164 | * @param string $name |
| 165 | * @return mixed |
| 166 | */ |
| 167 | public function getCallable(string $name): mixed |
| 168 | { |
| 169 | return $this->items[$name]?->getCallable(); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Check if a service has parameters |
| 174 | * |
| 175 | * @param string $name |
| 176 | * @return bool |
| 177 | */ |
| 178 | public function hasParameter(string $name): bool |
| 179 | { |
| 180 | return (isset($this->items[$name]) && $this->items[$name]->hasParameters()); |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Get a service's parameters |
| 185 | * |
| 186 | * @param string $name |
| 187 | * @return mixed |
| 188 | */ |
| 189 | public function getParameters(string $name): mixed |
| 190 | { |
| 191 | return $this->items[$name]?->getParameters(); |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Set a service's callable string or object |
| 196 | * |
| 197 | * @param string $name |
| 198 | * @param mixed $call |
| 199 | * @return static |
| 200 | */ |
| 201 | public function setCallable(string $name, mixed $call): static |
| 202 | { |
| 203 | if (isset($this->items[$name])) { |
| 204 | $this->items[$name]->setCallable($call); |
| 205 | } |
| 206 | return $this; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Set a service's parameters |
| 211 | * |
| 212 | * @param string $name |
| 213 | * @param mixed $params |
| 214 | * @return static |
| 215 | */ |
| 216 | public function setParameters(string $name, mixed $params): static |
| 217 | { |
| 218 | if (isset($this->items[$name])) { |
| 219 | if (is_array($params)) { |
| 220 | $this->items[$name]->setParameters($params); |
| 221 | } else { |
| 222 | $this->items[$name]->setParameters([$params]); |
| 223 | } |
| 224 | } |
| 225 | return $this; |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * Add to a service's parameters |
| 230 | * |
| 231 | * @param string $name |
| 232 | * @param mixed $param |
| 233 | * @param mixed $key |
| 234 | * @return static |
| 235 | */ |
| 236 | public function addParameter(string $name, mixed $param, mixed $key = null): static |
| 237 | { |
| 238 | if (isset($this->items[$name])) { |
| 239 | if ($key !== null) { |
| 240 | $this->items[$name]->addNamedParameter($key, $param); |
| 241 | } else { |
| 242 | $this->items[$name]->addParameter($param); |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | return $this; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * Remove a service's parameters |
| 251 | * |
| 252 | * @param string $name |
| 253 | * @param mixed $param |
| 254 | * @param mixed $key |
| 255 | * @return static |
| 256 | */ |
| 257 | public function removeParameters(string $name, mixed $param, mixed $key = null): static |
| 258 | { |
| 259 | if ($this->hasParameter($name)) { |
| 260 | if ($key !== null) { |
| 261 | $this->items[$name]->removeParameter($key); |
| 262 | } else { |
| 263 | foreach ($this->items[$name]->getParameters() as $key => $value) { |
| 264 | if ($value == $param) { |
| 265 | $this->items[$name]->removeParameter($key); |
| 266 | break; |
| 267 | } |
| 268 | } |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | return $this; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Determine of a service object is available (but not loaded) |
| 277 | * |
| 278 | * @param string $name |
| 279 | * @return bool |
| 280 | */ |
| 281 | public function isAvailable(string $name): bool |
| 282 | { |
| 283 | return isset($this->items[$name]); |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * Determine of a service object is loaded |
| 288 | * |
| 289 | * @param string $name |
| 290 | * @return bool |
| 291 | */ |
| 292 | public function isLoaded(string $name): bool |
| 293 | { |
| 294 | return isset($this->loaded[$name]); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * Re-load a service object |
| 299 | * |
| 300 | * @param string $name |
| 301 | * @return mixed |
| 302 | */ |
| 303 | public function reload(string $name): mixed |
| 304 | { |
| 305 | if (isset($this->loaded[$name])) { |
| 306 | unset($this->loaded[$name]); |
| 307 | } |
| 308 | |
| 309 | return $this->get($name); |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * Remove a service |
| 314 | * |
| 315 | * @param string $name |
| 316 | * @return static |
| 317 | */ |
| 318 | public function remove(string $name): static |
| 319 | { |
| 320 | if (isset($this->items[$name])) { |
| 321 | unset($this->items[$name]); |
| 322 | } |
| 323 | if (isset($this->loaded[$name])) { |
| 324 | unset($this->loaded[$name]); |
| 325 | } |
| 326 | return $this; |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * Set a service |
| 331 | * |
| 332 | * @param string $name |
| 333 | * @param mixed $value |
| 334 | * @throws Exception |
| 335 | * @return void |
| 336 | */ |
| 337 | public function __set(string $name, mixed $value): void |
| 338 | { |
| 339 | $this->set($name, $value); |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * Get a service |
| 344 | * |
| 345 | * @param string $name |
| 346 | * @throws Exception |
| 347 | * @return mixed |
| 348 | */ |
| 349 | public function __get(string $name): mixed |
| 350 | { |
| 351 | return $this->get($name); |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * Determine if a service is available |
| 356 | * |
| 357 | * @param string $name |
| 358 | * @return bool |
| 359 | */ |
| 360 | public function __isset(string $name): bool |
| 361 | { |
| 362 | return isset($this->items[$name]); |
| 363 | } |
| 364 | |
| 365 | /** |
| 366 | * Unset a service |
| 367 | * |
| 368 | * @param string $name |
| 369 | * @return void |
| 370 | */ |
| 371 | public function __unset(string $name): void |
| 372 | { |
| 373 | $this->remove($name); |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * Set a service |
| 378 | * |
| 379 | * @param mixed $offset |
| 380 | * @param mixed $value |
| 381 | * @throws Exception |
| 382 | * @return void |
| 383 | */ |
| 384 | public function offsetSet(mixed $offset, mixed $value): void |
| 385 | { |
| 386 | $this->set($offset, $value); |
| 387 | } |
| 388 | |
| 389 | /** |
| 390 | * Get a service |
| 391 | * |
| 392 | * @param mixed $offset |
| 393 | * @throws Exception |
| 394 | * @return mixed |
| 395 | */ |
| 396 | public function offsetGet(mixed $offset): mixed |
| 397 | { |
| 398 | return $this->get($offset); |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * Determine if a service is available |
| 403 | * |
| 404 | * @param mixed $offset |
| 405 | * @return bool |
| 406 | */ |
| 407 | public function offsetExists(mixed$offset): bool |
| 408 | { |
| 409 | return isset($this->items[$offset]); |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * Unset a service |
| 414 | * |
| 415 | * @param mixed $offset |
| 416 | * @return void |
| 417 | */ |
| 418 | public function offsetUnset(mixed $offset): void |
| 419 | { |
| 420 | $this->remove($offset); |
| 421 | } |
| 422 | |
| 423 | } |