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                         $return[$config['cat']][$config['k']] = $config['v'];
  36                 }
  37                 DBA::close($configs);
  38
  39                 $this->config_loaded = true;
  40
  41                 return $return;
  42         }
  43
  44         /**
  45          * {@inheritdoc}
  46          */
  47         public function get($cat, $key)
  48         {
  49                 if (!$this->isConnected()) {
  50                         return '!<unset>!';
  51                 }
  52
  53                 $config = DBA::selectFirst('config', ['v'], ['cat' => $cat, 'k' => $key]);
  54                 if (DBA::isResult($config)) {
  55                         // manage array value
  56                         $value = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
  57
  58                         if (isset($value) && $value !== '') {
  59                                 return $value;
  60                         }
  61                 }
  62
  63                 return '!<unset>!';
  64         }
  65
  66         /**
  67          * {@inheritdoc}
  68          */
  69         public function set($cat, $key, $value)
  70         {
  71                 if (!$this->isConnected()) {
  72                         return false;
  73                 }
  74
  75                 // We store our setting values as strings.
  76                 // So we have to do the conversion here so that the compare below works.
  77                 // The exception are array values.
  78                 $compare_value = !is_array($value) ? (string)$value : $value;
  79
  80                 if ($this->get($cat, $key) === $compare_value) {
  81                         return true;
  82                 }
  83
  84                 // manage array value
  85                 $dbvalue = is_array($value) ? serialize($value) : $value;
  86
  87                 $result = DBA::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $key], true);
  88
  89                 return $result;
  90         }
  91
  92         /**
  93          * {@inheritdoc}
  94          */
  95         public function delete($cat, $key)
  96         {
  97                 if (!$this->isConnected()) {
  98                         return false;
  99                 }
 100
 101                 $result = DBA::delete('config', ['cat' => $cat, 'k' => $key]);
 102
 103                 return $result;
 104         }
 105
 106         /**
 107          * {@inheritdoc}
 108          */
 109         public function isLoaded($cat, $key)
 110         {
 111                 if (!$this->isConnected()) {
 112                         return false;
 113                 }
 114
 115                 return $this->config_loaded;
 116         }
 117 }