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<?php |
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/** |
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* Copyright Aleksandar Panic |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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**/ |
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namespace ArekX\DataStreamer\Data; |
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use ArekX\DataStreamer\Contracts\Message; |
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use ArekX\DataStreamer\Contracts\MessageHandler; |
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use Exception; |
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/** |
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* Class CallableHandler |
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* @package ArekX\DataStreamer\Data |
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* |
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* Represents a callable handler which |
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* handles the message. |
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* |
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* @see Message |
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*/ |
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class CallableHandler implements MessageHandler |
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{ |
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/** |
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* Registered handlers by type. |
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* Type is the key and callable is the value. |
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* |
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* @var callable[] |
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*/ |
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protected $handlers = []; |
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/** |
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* Represents a default callable handler |
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* when no type is registered. |
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* If this is not set and no type is found |
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* this class will throw an exception. |
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* |
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* @see CallableHandler::handle() |
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* @var callable |
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*/ |
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protected $defaultHandler; |
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/** |
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* Sets a callable which will handle the message. |
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* |
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* Callable should be in the format: |
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* ```php |
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* function(Message $message) { |
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* } |
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* ``` |
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* |
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* @param string $type |
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* @param callable $handler |
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*/ |
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public function setHandler(string $type, callable $handler) |
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{ |
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$this->handlers[$type] = $handler; |
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} |
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/** |
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* Sets a default callable which will handle the message if it |
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* is not resolved by type. |
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* |
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* Callable should be in the format: |
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* ```php |
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* function(Message $message) { |
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* } |
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* ``` |
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* |
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* @param callable $handler |
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*/ |
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public function setDefaultHandler(callable $handler) |
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{ |
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$this->defaultHandler = $handler; |
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} |
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/** |
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* Handles a message by calling a callable |
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* from a type or a default handler. |
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* |
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* @param Message $message Message to be handled |
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* @throws Exception Exception which will be thrown if no callable is found and default is not set. |
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*/ |
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public function handle(Message $message): void |
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{ |
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$handleMessage = $this->defaultHandler; |
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if (!empty($this->handlers[$message->getType()])) { |
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$handleMessage = $this->handlers[$message->getType()]; |
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} |
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if (!is_callable($handleMessage)) { |
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throw new Exception('Cannot handle message: ' . ($message->getId() ?: 'Unknown ID')); |
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} |
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$handleMessage($message); |
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} |
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} |
ArekX /
php-data-streamer
