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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\Event; |
| 15 | |
| 16 | use Pop\AbstractManager; |
| 17 | use Pop\Utils\CallableObject; |
| 18 | |
| 19 | /** |
| 20 | * Event manager class |
| 21 | * |
| 22 | * @category Pop |
| 23 | * @package Pop\Event |
| 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 Manager extends AbstractManager |
| 30 | { |
| 31 | |
| 32 | /** |
| 33 | * Constant to stop the event manager |
| 34 | * @var string |
| 35 | */ |
| 36 | const STOP = 'Pop\Event\Manager::STOP'; |
| 37 | |
| 38 | /** |
| 39 | * Constant to send a kill signal to the application |
| 40 | * @var string |
| 41 | */ |
| 42 | const KILL = 'Pop\Event\Manager::KILL'; |
| 43 | |
| 44 | /** |
| 45 | * Event results |
| 46 | * @var array |
| 47 | */ |
| 48 | protected array $results = []; |
| 49 | |
| 50 | /** |
| 51 | * Event 'alive' tracking flag |
| 52 | * @var bool |
| 53 | */ |
| 54 | protected bool $alive = true; |
| 55 | |
| 56 | /** |
| 57 | * Constructor |
| 58 | * |
| 59 | * Instantiate the event manager object. |
| 60 | * |
| 61 | * @param ?string $name |
| 62 | * @param mixed $action |
| 63 | * @param int $priority |
| 64 | */ |
| 65 | public function __construct(?string $name = null, mixed $action = null, int $priority = 0) |
| 66 | { |
| 67 | if (($name !== null) && ($action !== null)) { |
| 68 | $this->on($name, $action, $priority); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Attach an event listener |
| 74 | * |
| 75 | * $event->on('event.name', 'someFunction'); |
| 76 | * $event->on('event.name', function() { ... }); |
| 77 | * $event->on('event.name', new SomeClass()); |
| 78 | * $event->on('event.name', [new SomeClass, 'foo']); |
| 79 | * $event->on('event.name', 'SomeClass'); |
| 80 | * $event->on('event.name', 'SomeClass->foo'); |
| 81 | * $event->on('event.name', 'SomeClass::bar'); |
| 82 | * |
| 83 | * @param string $name |
| 84 | * @param mixed $action |
| 85 | * @param int $priority |
| 86 | * @return Manager |
| 87 | */ |
| 88 | public function on(string $name, mixed $action, int $priority = 0): static |
| 89 | { |
| 90 | if (!isset($this->items[$name])) { |
| 91 | $this->items[$name] = new \SplPriorityQueue(); |
| 92 | } |
| 93 | if (!($action instanceof CallableObject)) { |
| 94 | $action = new CallableObject($action); |
| 95 | } |
| 96 | $this->items[$name]->insert($action, $priority); |
| 97 | |
| 98 | return $this; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Detach an event listener |
| 103 | * |
| 104 | * @param string $name |
| 105 | * @param mixed $action |
| 106 | * @return Manager |
| 107 | */ |
| 108 | public function off(string $name, mixed $action): static |
| 109 | { |
| 110 | // If the event exists, loop through and remove the action if found. |
| 111 | if (isset($this->items[$name])) { |
| 112 | $newListeners = new \SplPriorityQueue(); |
| 113 | |
| 114 | $listeners = clone $this->items[$name]; |
| 115 | $listeners->setExtractFlags(\SplPriorityQueue::EXTR_BOTH); |
| 116 | |
| 117 | foreach ($listeners as $value) { |
| 118 | $item = $listeners->current(); |
| 119 | if ($action !== $item['data']) { |
| 120 | $newListeners->insert($item['data'], $item['priority']); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | $this->items[$name] = $newListeners; |
| 125 | } |
| 126 | |
| 127 | return $this; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Return an event |
| 132 | * |
| 133 | * @param string $name |
| 134 | * @return mixed |
| 135 | */ |
| 136 | public function get(string $name): mixed |
| 137 | { |
| 138 | return $this->getItem($name); |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Determine whether the event manager has an event registered with it |
| 143 | * |
| 144 | * @param string $name |
| 145 | * @return bool |
| 146 | */ |
| 147 | public function has(string $name): bool |
| 148 | { |
| 149 | return $this->hasItem($name); |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Return the event results |
| 154 | * |
| 155 | * @param string $name |
| 156 | * @return mixed |
| 157 | */ |
| 158 | public function getResults(string $name): mixed |
| 159 | { |
| 160 | return $this->results[$name] ?? null; |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Determine if the project application is still alive or has been killed |
| 165 | * |
| 166 | * @return bool |
| 167 | */ |
| 168 | public function alive(): bool |
| 169 | { |
| 170 | return $this->alive; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Trigger an event listener |
| 175 | * |
| 176 | * @param string $name |
| 177 | * @param array $params |
| 178 | * @return void |
| 179 | */ |
| 180 | public function trigger(string $name, array $params = []): void |
| 181 | { |
| 182 | if (isset($this->items[$name])) { |
| 183 | if (!isset($this->results[$name])) { |
| 184 | $this->results[$name] = []; |
| 185 | } |
| 186 | |
| 187 | foreach ($this->items[$name] as $action) { |
| 188 | if (end($this->results[$name]) == self::STOP) { |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | $params['result'] = end($this->results[$name]); |
| 193 | $result = $action->call($params); |
| 194 | $this->results[$name][] = $result; |
| 195 | |
| 196 | if ($result == self::KILL) { |
| 197 | $this->alive = false; |
| 198 | } |
| 199 | } |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Set an event |
| 205 | * |
| 206 | * @param string $name |
| 207 | * @param mixed $value |
| 208 | * @return void |
| 209 | */ |
| 210 | public function __set(string $name, mixed $value): void |
| 211 | { |
| 212 | $this->on($name, $value); |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Set an event |
| 217 | * |
| 218 | * @param mixed $offset |
| 219 | * @param mixed $value |
| 220 | * @return void |
| 221 | */ |
| 222 | public function offsetSet(mixed $offset, mixed $value): void |
| 223 | { |
| 224 | $this->on($offset, $value); |
| 225 | } |
| 226 | |
| 227 | } |