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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\MessageParser; |
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use Exception; |
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/** |
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* Class CallableParser |
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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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* resolves message data by type to a specific |
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* callable function which will return an instance of |
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* Message |
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* |
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* @see Message |
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*/ |
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class CallableParser implements MessageParser |
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{ |
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/** |
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* Registered builders 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 $builders = []; |
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/** |
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* Represents a default callable builder |
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* when no type is registered. |
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* |
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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 CallableParser::parse() |
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* @var callable |
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*/ |
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protected $defaultBuilder = null; |
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/** |
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* |
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* Sets a callable which should return an instance of |
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* 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(string $id, string $type, array $payload) { |
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* return // Should return an instance of 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 $builder |
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*/ |
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public function setBuilder(string $type, callable $builder) |
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{ |
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$this->builders[$type] = $builder; |
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} |
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/** |
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* |
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* Sets a callable which will run if parser cannot |
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* resolve to a specific 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(string $id, string $type, array $payload) { |
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* return // Should return an instance of Message. |
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* } |
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* ``` |
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* |
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* @param callable $builder |
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*/ |
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public function setDefaultBuilder(callable $builder) |
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{ |
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$this->defaultBuilder = $builder; |
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} |
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/** |
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* Resolves a message to a specific builder based on the |
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* message type. |
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* |
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* @param string $id ID of the message |
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* @param array $message Data of the message |
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* @return Message Resolved instance of Message |
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* @throws Exception Exception which will be thrown if there is no default builder set and type is not resolved. |
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*/ |
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public function parse(string $id, array $message): Message |
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{ |
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$buildMessage = $this->defaultBuilder; |
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$type = $message['type']; |
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if (!empty($this->builders[$type])) { |
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$buildMessage = $this->builders[$type]; |
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} |
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if (!is_callable($buildMessage)) { |
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throw new Exception('Could not build message ID:' . $id); |
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} |
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$payload = @json_decode($message['payload'], true) ?: []; |
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return $buildMessage($id, $type, $payload); |
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} |
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} |
ArekX /
php-data-streamer
