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 = $config['v'];
  36                         if (isset($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                         // manage array value
  59                         $value = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
  60
  61                         if (isset($value)) {
  62                                 return $value;
  63                         }
  64                 }
  65
  66                 return null;
  67         }
  68
  69         /**
  70          * {@inheritdoc}
  71          */
  72         public function set($cat, $key, $value)
  73         {
  74                 if (!$this->isConnected()) {
  75                         return false;
  76                 }
  77
  78                 // We store our setting values as strings.
  79                 // So we have to do the conversion here so that the compare below works.
  80                 // The exception are array values.
  81                 $compare_value = !is_array($value) ? (string)$value : $value;
  82
  83                 if ($this->get($cat, $key) === $compare_value) {
  84                         return true;
  85                 }
  86
  87                 // manage array value
  88                 $dbvalue = is_array($value) ? serialize($value) : $value;
  89
  90                 return DBA::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $key], true);
  91         }
  92
  93         /**
  94          * {@inheritdoc}
  95          */
  96         public function delete($cat, $key)
  97         {
  98                 if (!$this->isConnected()) {
  99                         return false;
 100                 }
 101
 102                 return DBA::delete('config', ['cat' => $cat, 'k' => $key]);
 103         }
 104
 105         /**
 106          * {@inheritdoc}
 107          */
 108         public function isLoaded($cat, $key)
 109         {
 110                 if (!$this->isConnected()) {
 111                         return false;
 112                 }
 113
 114                 return $this->config_loaded;
 115         }
 116 }