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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; under version 2 |
| 7 | * of the License (non-upgradable). |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 17 | * |
| 18 | * Copyright (c) 2015-2022 (original work) Open Assessment Technologies SA; |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | namespace oat\oatbox\event; |
| 23 | |
| 24 | use common_Logger; |
| 25 | use oat\oatbox\service\ConfigurableService; |
| 26 | use oat\oatbox\service\ServiceNotFoundException; |
| 27 | use Throwable; |
| 28 | |
| 29 | /** |
| 30 | * The simple placeholder ServiceManager |
| 31 | * @author Joel Bout <joel@taotesting.com> |
| 32 | */ |
| 33 | class EventManager extends ConfigurableService |
| 34 | { |
| 35 | public const SERVICE_ID = 'generis/event'; |
| 36 | |
| 37 | /** |
| 38 | * @deprecated use SERVICE_ID |
| 39 | */ |
| 40 | public const CONFIG_ID = 'generis/event'; |
| 41 | |
| 42 | public const OPTION_LISTENERS = 'listeners'; |
| 43 | |
| 44 | /** |
| 45 | * Dispatch an event and trigger its listeners |
| 46 | * |
| 47 | * @param mixed $event either an Event object or a string |
| 48 | * @param array $params |
| 49 | */ |
| 50 | public function trigger($event, $params = []) |
| 51 | { |
| 52 | $container = $this->getServiceManager()->getContainer(); |
| 53 | |
| 54 | $event = is_object($event) ? $event : new GenericEvent($event, $params); |
| 55 | |
| 56 | foreach ($this->getListeners($event) as $callback) { |
| 57 | $callbackName = $callback; |
| 58 | |
| 59 | if (is_array($callback) && count($callback) == 2) { |
| 60 | [$key, $function] = $callback; |
| 61 | |
| 62 | if (is_object($key)) { |
| 63 | $callbackName = sprintf('%s::%s', get_class($key), $function); |
| 64 | } |
| 65 | |
| 66 | if (is_string($key)) { |
| 67 | $callbackName = sprintf('%s::%s', $key, $function); |
| 68 | |
| 69 | try { |
| 70 | $service = $container->get($key); |
| 71 | $callback = [$service, $function]; |
| 72 | } catch (ServiceNotFoundException $e) { |
| 73 | //do nothing |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | if (!is_callable($callback)) { |
| 79 | common_Logger::w( |
| 80 | sprintf( |
| 81 | 'Event manager cannot call %s because it is not a callable. ' |
| 82 | . 'Notice, that classes registered in DI container cannot be executed during the installation', |
| 83 | $callbackName |
| 84 | ) |
| 85 | ); |
| 86 | |
| 87 | continue; |
| 88 | } |
| 89 | |
| 90 | call_user_func($callback, $event); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Attach a Listener to one or multiple events |
| 96 | * |
| 97 | * @param mixed $event either an Event object or a string |
| 98 | * @param callable $callback |
| 99 | */ |
| 100 | public function attach($event, $callback) |
| 101 | { |
| 102 | $events = is_array($event) ? $event : [$event]; |
| 103 | $listeners = $this->getOption(self::OPTION_LISTENERS); |
| 104 | foreach ($events as $event) { |
| 105 | $eventObject = is_object($event) ? $event : new GenericEvent($event); |
| 106 | if (!isset($listeners[$eventObject->getName()])) { |
| 107 | $listeners[$eventObject->getName()] = []; |
| 108 | } |
| 109 | |
| 110 | if (!in_array($callback, $listeners[$eventObject->getName()], true)) { |
| 111 | $listeners[$eventObject->getName()][] = $callback; |
| 112 | } |
| 113 | } |
| 114 | $this->setOption(self::OPTION_LISTENERS, $listeners); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * remove listener from an event and delete event if it dosn't have any listeners |
| 119 | * @param array $listeners |
| 120 | * @param string $eventName |
| 121 | * @param callable $callback |
| 122 | * @return array |
| 123 | */ |
| 124 | protected function removeListener(array $listeners, $eventObject, $callback) |
| 125 | { |
| 126 | if (isset($listeners[$eventObject->getName()])) { |
| 127 | if (($index = array_search($callback, $listeners[$eventObject->getName()])) !== false) { |
| 128 | unset($listeners[$eventObject->getName()][$index]); |
| 129 | if (empty($listeners[$eventObject->getName()])) { |
| 130 | unset($listeners[$eventObject->getName()]); |
| 131 | } else { |
| 132 | $listeners[$eventObject->getName()] = array_values($listeners[$eventObject->getName()]); |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | return $listeners; |
| 137 | } |
| 138 | |
| 139 | |
| 140 | /** |
| 141 | * Detach a Listener from one or multiple events |
| 142 | * |
| 143 | * @param mixed $event either an Event object or a string |
| 144 | * @param Callable $callback |
| 145 | */ |
| 146 | public function detach($event, $callback) |
| 147 | { |
| 148 | $events = is_array($event) ? $event : [$event]; |
| 149 | $listeners = $this->getOption(self::OPTION_LISTENERS); |
| 150 | foreach ($events as $event) { |
| 151 | $eventObject = is_object($event) ? $event : new GenericEvent($event); |
| 152 | $listeners = $this->removeListener($listeners, $eventObject, $callback); |
| 153 | } |
| 154 | $this->setOption(self::OPTION_LISTENERS, $listeners); |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Get all Listeners listening to this kind of event |
| 159 | * |
| 160 | * @param Event $eventObject |
| 161 | * @return Callable[] listeners associated with this event |
| 162 | */ |
| 163 | protected function getListeners(Event $eventObject) |
| 164 | { |
| 165 | $listeners = $this->getOption(self::OPTION_LISTENERS); |
| 166 | return isset($listeners[$eventObject->getName()]) |
| 167 | ? $listeners[$eventObject->getName()] |
| 168 | : []; |
| 169 | } |
| 170 | } |