src/Core/Config/Adapter/PreloadConfigAdapter.php

   1 <?php
   2
   3 namespace Friendica\Core\Config\Adapter;
   4
   5 use Friendica\Database\DBA;
   6
   7 /**
   8  * Preload Configuration Adapter
   9  *
  10  * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
  11  *
  12  * @author Hypolite Petovan <hypolite@mrpetovan.com>
  13  */
  14 class PreloadConfigAdapter extends AbstractDbaConfigAdapter implements IConfigAdapter
  15 {
  16         private $config_loaded = false;
  17
  18         /**
  19          * {@inheritdoc}
  20          */
  21         public function load($cat = 'config')
  22         {
  23                 $return = [];
  24
  25                 if (!$this->isConnected()) {
  26                         return $return;
  27                 }
  28
  29                 if ($this->config_loaded) {
  30                         return $return;
  31                 }
  32
  33                 $configs = DBA::select('config', ['cat', 'v', 'k']);
  34                 while ($config = DBA::fetch($configs)) {
  35                         $value = $this->toConfigValue($config['v']);
  36                         if (isset($value)) {
  37                                 $return[$config['cat']][$config['k']] = $value;
  38                         }
  39                 }
  40                 DBA::close($configs);
  41
  42                 $this->config_loaded = true;
  43
  44                 return $return;
  45         }
  46
  47         /**
  48          * {@inheritdoc}
  49          */
  50         public function get($cat, $key)
  51         {
  52                 if (!$this->isConnected()) {
  53                         return null;
  54                 }
  55
  56                 $config = DBA::selectFirst('config', ['v'], ['cat' => $cat, 'k' => $key]);
  57                 if (DBA::isResult($config)) {
  58                         $value = $this->toConfigValue($config['v']);
  59
  60                         if (isset($value)) {
  61                                 return $value;
  62                         }
  63                 }
  64
  65                 return null;
  66         }
  67
  68         /**
  69          * {@inheritdoc}
  70          */
  71         public function set($cat, $key, $value)
  72         {
  73                 if (!$this->isConnected()) {
  74                         return false;
  75                 }
  76
  77                 // We store our setting values as strings.
  78                 // So we have to do the conversion here so that the compare below works.
  79                 // The exception are array values.
  80                 $compare_value = !is_array($value) ? (string)$value : $value;
  81                 $stored_value = $this->get($cat, $key);
  82
  83                 if (isset($stored_value) && $stored_value === $compare_value) {
  84                         return true;
  85                 }
  86
  87                 $dbvalue = $this->toDbValue($value);
  88
  89                 return DBA::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $key], true);
  90         }
  91
  92         /**
  93          * {@inheritdoc}
  94          */
  95         public function delete($cat, $key)
  96         {
  97                 if (!$this->isConnected()) {
  98                         return false;
  99                 }
 100
 101                 return DBA::delete('config', ['cat' => $cat, 'k' => $key]);
 102         }
 103
 104         /**
 105          * {@inheritdoc}
 106          */
 107         public function isLoaded($cat, $key)
 108         {
 109                 if (!$this->isConnected()) {
 110                         return false;
 111                 }
 112
 113                 return $this->config_loaded;
 114         }
 115 }