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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Ps2alerts\Api\Loader\Statistics;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Ps2alerts\Api\Loader\Statistics\AbstractStatisticsLoader;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Ps2alerts\Api\QueryObjects\QueryObject;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Ps2alerts\Api\Repository\AlertRepository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Ps2alerts\Api\Validator\AlertInputValidator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class AlertStatisticsLoader extends AbstractStatisticsLoader  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var \Ps2alerts\Api\Repository\AlertRepository  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $repository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var \Ps2alerts\Api\Validator\AlertInputValidator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $inputValidator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Construct  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Ps2alerts\Api\Repository\AlertRepository    $repository  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Ps2alerts\Api\Validator\AlertInputValidator $inputValidator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        AlertRepository     $repository,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        AlertInputValidator $inputValidator  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->repository     = $repository;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->inputValidator = $inputValidator;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->setCacheNamespace('Statistics'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->setType('Alerts'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Read total counts for alerts  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  array $post  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function readTotals(array $post)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $redisKey = "{$this->getCacheNamespace()}:{$this->getType()}:Totals"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $redisKey = $this->appendRedisKey($post, $redisKey);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $post = $this->processPostVars($post);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getLogDriver()->addDebug($redisKey);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->checkRedis($redisKey)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->getFromRedis($redisKey);  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $queryObject = new QueryObject;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $queryObject = $this->setupQueryObject($queryObject, $post);  | 
            
                            
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                        $queryObject->addSelect('COUNT(ResultID) AS COUNT'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->checkRedis($redisKey)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->getFromRedis($redisKey);  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->setCacheExpireTime(900); // 15 mins  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->cacheAndReturn(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->repository->read($queryObject),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $redisKey  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Retrieves all zone totals and caches as required  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function readZoneTotals()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $masterRedisKey = "{$this->getCacheNamespace()}:{$this->getType()}:Totals:Zones"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getLogDriver()->addDebug($masterRedisKey);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->checkRedis($masterRedisKey)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->getLogDriver()->addDebug("Pulled the lot from Redis"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->getFromRedis($masterRedisKey);  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $servers  = [1,10,13,17,25,1000,2000];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $zones    = [2,4,6,8];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $factions = ['vs','nc','tr','draw'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $results = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->setCacheExpireTime(3600); // 1 Hour  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // Dat loop yo  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($servers as $server) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($zones as $zone) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                foreach ($factions as $faction) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                    $results[$server][$zone][$faction] = $this->getZoneStats($server, $zone, $faction);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // Commit to Redis  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->cacheAndReturn(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $results,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $masterRedisKey  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Gets all information regarding zone victories out of the DB and caches as  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * required  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @see readZoneTotals()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  integer $server  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  integer $zone  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  integer $faction  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return array  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function getZoneStats($server, $zone, $faction)  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        $redisKey = "{$this->getCacheNamespace()}:{$this->getType()}:Totals:Zones"; | 
            
            
                                                        
            
                                    
            
            
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                        $redisKey .= ":{$server}:{$zone}:{$faction}"; | 
            
            
                                                        
            
                                    
            
            
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                        $this->getLogDriver()->addDebug($redisKey);  | 
            
            
                                                        
            
                                    
            
            
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                        if ($this->checkRedis($redisKey)) { | 
            
            
                                                        
            
                                    
            
            
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                    134
                 | 
                                    
                                                     | 
                
                 | 
                            $this->getLogDriver()->addDebug("CACHE PULL"); | 
            
            
                                                        
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                            return $this->getFromRedis($redisKey);  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                        
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                        }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                        
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                        // Fire a set of queries to build the object required  | 
            
            
                                                        
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                        $queryObject = new QueryObject;  | 
            
            
                                                        
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                        $queryObject->addSelect('COUNT(ResultID) AS COUNT'); | 
            
            
                                                        
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                        $queryObject->addWhere([  | 
            
            
                                                        
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                            'col'   => 'ResultServer',  | 
            
            
                                                        
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                            'value' => $server  | 
            
            
                                                        
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                        ]);  | 
            
            
                                                        
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                        $queryObject->addWhere([  | 
            
            
                                                        
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                            'col'   => 'ResultAlertCont',  | 
            
            
                                                        
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                            'value' => $zone  | 
            
            
                                                        
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                        ]);  | 
            
            
                                                        
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                        $queryObject->addWhere([  | 
            
            
                                                        
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                            'col'   => 'ResultWinner',  | 
            
            
                                                        
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                            'value' => $faction  | 
            
            
                                                        
            
                                    
            
            
                | 
                    152
                 | 
                                    
                                                     | 
                
                 | 
                        ]);  | 
            
            
                                                        
            
                                    
            
            
                | 
                    153
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                        
            
                                    
            
            
                | 
                    154
                 | 
                                    
                                                     | 
                
                 | 
                        // Commit to Redis  | 
            
            
                                                        
            
                                    
            
            
                | 
                    155
                 | 
                                    
                                                     | 
                
                 | 
                        return $this->cacheAndReturn(  | 
            
            
                                                        
            
                                    
            
            
                | 
                    156
                 | 
                                    
                                                     | 
                
                 | 
                            $this->repository->read($queryObject)[0]["COUNT"],  | 
            
            
                                                        
            
                                    
            
            
                | 
                    157
                 | 
                                    
                                                     | 
                
                 | 
                            $redisKey  | 
            
            
                                                        
            
                                    
            
            
                | 
                    158
                 | 
                                    
                                                     | 
                
                 | 
                        );  | 
            
            
                                                        
            
                                    
            
            
                | 
                    159
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    160
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    161
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.