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                <?php  | 
            
                            
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                namespace SilverStripe\FullTextSearch\Solr\Reindex\Jobs;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symbiote\QueuedJobs\Services\QueuedJob;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                if (!interface_exists(QueuedJob::class)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Queuedjob to re-index a small group within an index.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This job is optimised for efficient full re-indexing of an index via Solr_Reindex.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Operates similarly to {@see SearchUpdateQueuedJobProcessor} but can not work with an arbitrary | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * list of IDs. Instead groups are segmented by ID. Additionally, this task does incremental  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * deletions of records.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class SolrReindexGroupQueuedJob extends SolrReindexQueuedJobBase  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Name of index to reindex  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $indexName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Variant state that this group belongs to  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var type  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $state;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Single class name to index  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $class;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Total number of groups  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var int  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $groups;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Group index  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var int  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $group;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct($indexName = null, $state = null, $class = null, $groups = null, $group = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::__construct();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->indexName = $indexName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->state = $state;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->class = $class;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->groups = $groups;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->group = $group;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getJobData()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data = parent::getJobData();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // Custom data  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data->jobData->indexName = $this->indexName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data->jobData->state = $this->state;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data->jobData->class = $this->class;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data->jobData->groups = $this->groups;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data->jobData->group = $this->group;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $data;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function setJobData($totalSteps, $currentStep, $isComplete, $jobData, $messages)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::setJobData($totalSteps, $currentStep, $isComplete, $jobData, $messages);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // Custom data  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->indexName = $jobData->indexName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->state = $jobData->state;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->class = $jobData->class;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->groups = $jobData->groups;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->group = $jobData->group;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getTitle()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return sprintf(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Solr Reindex Group (%d/%d) of %s in %s',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ($this->group+1),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->groups,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->class,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            json_encode($this->state)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function process()  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        $logger = $this->getLogger();  | 
            
            
                                                        
            
                                    
            
            
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                        if ($this->jobFinished()) { | 
            
            
                                                        
            
                                    
            
            
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                            $logger->notice("reindex group already complete"); | 
            
            
                                                        
            
                                    
            
            
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                            return;  | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                        // Get instance of index  | 
            
            
                                                        
            
                                    
            
            
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                        $indexInstance = singleton($this->indexName);  | 
            
            
                                                        
            
                                    
            
            
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                        // Send back to processor  | 
            
            
                                                        
            
                                    
            
            
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                        $logger->info("Beginning reindex group"); | 
            
            
                                                        
            
                                    
            
            
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                        $this  | 
            
            
                                                        
            
                                    
            
            
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                            ->getHandler()  | 
            
            
                                                        
            
                                    
            
            
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                            ->runGroup($logger, $indexInstance, $this->state, $this->class, $this->groups, $this->group);  | 
            
            
                                                        
            
                                    
            
            
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                        $logger->info("Completed reindex group"); | 
            
            
                                                        
            
                                    
            
            
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                        $this->isComplete = true;  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.