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<?php |
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/* |
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* Copyright (c) 2013 Janos Szurovecz |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy of |
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* this software and associated documentation files (the "Software"), to deal in |
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* the Software without restriction, including without limitation the rights to |
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
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* of the Software, and to permit persons to whom the Software is furnished to do |
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* so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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namespace predaddy\commandhandling; |
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use precore\util\Preconditions; |
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use predaddy\messagehandling\SimpleMessageBus; |
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/** |
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* A typical command bus has the following behaviours: |
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* - all command handler methods are wrapped by a unique transaction |
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* - the type of the message must be exactly the same as the parameter in the handler method |
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* |
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* Only one command handler can process a particular command, otherwise a runtime exception will be thrown. |
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* |
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* @author Janos Szurovecz <[email protected]> |
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*/ |
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class CommandBus extends SimpleMessageBus |
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{ |
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/** |
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* @param CommandBusBuilder $builder |
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*/ |
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public function __construct(CommandBusBuilder $builder = null) |
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{ |
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if ($builder === null) { |
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$builder = self::builder(); |
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} |
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parent::__construct($builder); |
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} |
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/** |
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* @return CommandBusBuilder |
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*/ |
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public static function builder() |
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{ |
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return new CommandBusBuilder(); |
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} |
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protected function callableWrappersFor($message) |
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{ |
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$wrappers = parent::callableWrappersFor($message); |
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Preconditions::checkState( |
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count($wrappers) <= 1, |
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"More than one command handler is registered for message '%s'", |
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get_class($message) |
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); |
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return $wrappers; |
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} |
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} |
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szjani /
predaddy
