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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace AppBundle\Utils;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Doctrine\ORM\EntityManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AppBundle\Entity\Poll;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class PollManager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $entityManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $pollRepo;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $electionManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Constructor  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param EntityManager $entityManager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function __construct(EntityManager $entityManager, ElectionManager $electionManager)  | 
            
                            
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                	{ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->entityManager = $entityManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->repo = $this->entityManager->getRepository('AppBundle:Poll'); | 
            
                            
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                        $this->electionManager = $electionManager;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get an array of current polls (objects)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getCurrentPolls(): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $currentPolls = $this->repo->findByActive(true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $currentPolls;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get an array of eligible votes  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  AppBundle/Entity/PollType $type  | 
            
                            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getEligibleVoters(PollType $type): array  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    	return [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get an array of all polls (objects)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getAllPolls(): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    	$polls = $this->repo->findAll();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    	return $polls;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get poll statistics  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  Poll   $poll  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function getPollStats(Poll $poll): array  | 
            
                            
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                    	// If Poll is election then reject  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    	// Get standard stats  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    	return [];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get the result of the poll (in terms of a choice)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  Poll   $poll  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return AppBundle/Entity/Choice  | 
            
                            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getPollResult(Poll $poll): Choice  | 
            
                            
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                    	// If election then call Election Manager  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    	// Calculate winning choice  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    	return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getStandardPollVotes(Poll $poll): array  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    	return [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function markPollClosed(Poll $poll)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    	return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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The
EntityManagermight become unusable for example if a transaction is rolled back and it gets closed. Let’s assume that somewhere in your application, or in a third-party library, there is code such as the following:If that code throws an exception and the
EntityManageris closed. Any other code which depends on the same instance of theEntityManagerduring this request will fail.On the other hand, if you instead inject the
ManagerRegistry, thegetManager()method guarantees that you will always get a usable manager instance.