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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Tarantool\Mapper\Plugin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Entity;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Plugin;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Tarantool\Mapper\Space;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class Sequence extends Plugin  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function generateKey(Entity $instance, Space $space)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $primary = $space->getPrimaryIndex();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (count($primary->parts) == 1) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $key = $space->getFormat()[$primary->parts[0][0]]['name'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (!property_exists($instance, $key)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $instance->$key = $this->generateValue($space);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private function generateValue($space)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $spaceId = $space->getId();  | 
            
                            
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                        if (!$this->mapper->getSchema()->hasSpace('sequence')) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $sequence = $this->mapper->getSchema()->createSpace('sequence'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $sequence->addProperty('space', 'unsigned'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $sequence->addProperty('counter', 'unsigned'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $sequence->createIndex('space'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $entity = $this->mapper->findOne('sequence', $space->getId()); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!$entity) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $query = "return box.space.".$space->getName().".index[0]:max()";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $data = $this->mapper->getClient()->evaluate($query)->getData();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $max = $data ? $data[0][0] : 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $entity = $this->mapper->create('sequence', [ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'space' => $space->getId(),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'counter' => $max,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->mapper->getSchema()->getSpace('sequence') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->getRepository()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->update($entity, [['+', 'counter', 1]]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $entity->counter;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.