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