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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This file is part of the daikon-cqrs/message-bus project.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please view the LICENSE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * file that was distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Daikon\MessageBus\Channel\Subscription;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Daikon\MessageBus\Channel\Subscription\MessageHandler\MessageHandlerList;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Daikon\MessageBus\EnvelopeInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Daikon\MessageBus\MessageBusInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Daikon\MessageBus\Metadata\CallbackMetadataEnricher;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Daikon\MessageBus\Metadata\Metadata;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Daikon\MessageBus\Metadata\MetadataEnricherList;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class LazySubscription implements SubscriptionInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $compositeSubscription;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $factoryCallback;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        string $key,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        callable $transport,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        callable $messageHandlers,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        callable $guard = null,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        MetadataEnricherList $metadataEnrichers = null  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->factoryCallback = function () use ($key, $transport, $messageHandlers, $guard, $metadataEnrichers) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $metadataEnrichers = $metadataEnrichers->prepend(  | 
            
                            
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                                new CallbackMetadataEnricher(function (Metadata $metadata): Metadata { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    return $metadata->with(self::METADATA_KEY, $this->getKey());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                })  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return new Subscription(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $key,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $transport(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $messageHandlers(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $guard,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $metadataEnrichers  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        };  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function publish(EnvelopeInterface $envelope, MessageBusInterface $messageBus): bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getSubscription()->publish($envelope);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function receive(EnvelopeInterface $envelope): bool  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $this->getSubscription()->receive($envelope);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getKey(): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->getSubscription()->getKey();  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getSubscription(): MessageHandlerList  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!$this->compositeSubscription) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->compositeSubscription = call_user_func($this->factoryCallback);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->factoryCallback = null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->compositeSubscription;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like you are assigning to a variable which was imported through a
usestatement which was not imported by reference.For clarity, we suggest to use a different name or import by reference depending on whether you would like to have the change visibile in outer-scope.
Change not visible in outer-scope
Change visible in outer-scope