Merge pull request #4540 from MrPetovan/task/4520-load-whole-config

[develop] Performance: Add preloading config adapter

src/Core/Config.php

@@ -8,26 +8,33 @@
  */
 namespace Friendica\Core;
 
-use Friendica\Database\DBM;
-use dba;
+use Friendica\BaseObject;
+use Friendica\Core\Config;
 
 require_once 'include/dba.php';
 
 /**
- * @brief Arbitrary sytem configuration storage
+ * @brief Arbitrary system configuration storage
  *
  * Note:
  * If we ever would decide to return exactly the variable type as entered,
  * we will have fun with the additional features. :-)
- *
- * The config class always returns strings but in the default features
- * we use a "false" to determine if the config value isn't set.
- *
  */
-class Config
+class Config extends BaseObject
 {
-	private static $cache;
-	private static $in_db;
+	/**
+	 * @var Friendica\Core\Config\IConfigAdapter
+	 */
+	private static $adapter = null;
+
+	public static function init()
+	{
+		if (self::getApp()->getConfigValue('system', 'config_adapter') == 'preload') {
+			self::$adapter = new Config\PreloadConfigAdapter();
+		} else {
+			self::$adapter = new Config\JITConfigAdapter();
+		}
+	}
 
 	/**
 	 * @brief Loads all configuration values of family into a cached storage.
@@ -41,26 +48,11 @@ class Config
 	 */
 	public static function load($family = "config")
 	{
-		// We don't preload "system" anymore.
-		// This reduces the number of database reads a lot.
-		if ($family === 'system') {
-			return;
+		if (empty(self::$adapter)) {
+			self::init();
 		}
 
-		$a = get_app();
-
-		$r = dba::select('config', ['v', 'k'], ['cat' => $family]);
-		while ($rr = dba::fetch($r)) {
-			$k = $rr['k'];
-			if ($family === 'config') {
-				$a->config[$k] = $rr['v'];
-			} else {
-				$a->config[$family][$k] = $rr['v'];
-				self::$cache[$family][$k] = $rr['v'];
-				self::$in_db[$family][$k] = true;
-			}
-		}
-		dba::close($r);
+		self::$adapter->load($family);
 	}
 
 	/**
@@ -84,40 +76,11 @@ class Config
 	 */
 	public static function get($family, $key, $default_value = null, $refresh = false)
 	{
-		$a = get_app();
-
-		if (!$refresh) {
-			// Do we have the cached value? Then return it
-			if (isset(self::$cache[$family][$key])) {
-				if (self::$cache[$family][$key] === '!<unset>!') {
-					return $default_value;
-				} else {
-					return self::$cache[$family][$key];
-				}
-			}
+		if (empty(self::$adapter)) {
+			self::init();
 		}
 
-		$config = dba::selectFirst('config', ['v'], ['cat' => $family, 'k' => $key]);
-		if (DBM::is_result($config)) {
-			// manage array value
-			$val = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
-
-			// Assign the value from the database to the cache
-			self::$cache[$family][$key] = $val;
-			self::$in_db[$family][$key] = true;
-			return $val;
-		} elseif (isset($a->config[$family][$key])) {
-			// Assign the value (mostly) from the .htconfig.php to the cache
-			self::$cache[$family][$key] = $a->config[$family][$key];
-			self::$in_db[$family][$key] = false;
-
-			return $a->config[$family][$key];
-		}
-
-		self::$cache[$family][$key] = '!<unset>!';
-		self::$in_db[$family][$key] = false;
-
-		return $default_value;
+		return self::$adapter->get($family, $key, $default_value, $refresh);
 	}
 
 	/**
@@ -136,38 +99,11 @@ class Config
 	 */
 	public static function set($family, $key, $value)
 	{
-		$a = get_app();
-
-		// We store our setting values in a string variable.
-		// So we have to do the conversion here so that the compare below works.
-		// The exception are array values.
-		$dbvalue = (!is_array($value) ? (string)$value : $value);
-
-		$stored = self::get($family, $key, null, true);
-
-		if (($stored === $dbvalue) && self::$in_db[$family][$key]) {
-			return true;
+		if (empty(self::$adapter)) {
+			self::init();
 		}
 
-		if ($family === 'config') {
-			$a->config[$key] = $dbvalue;
-		} elseif ($family != 'system') {
-			$a->config[$family][$key] = $dbvalue;
-		}
-
-		// Assign the just added value to the cache
-		self::$cache[$family][$key] = $dbvalue;
-
-		// manage array value
-		$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
-
-		$ret = dba::update('config', ['v' => $dbvalue], ['cat' => $family, 'k' => $key], true);
-
-		if ($ret) {
-			self::$in_db[$family][$key] = true;
-			return $value;
-		}
-		return $ret;
+		return self::$adapter->set($family, $key, $value);
 	}
 
 	/**
@@ -183,13 +119,10 @@ class Config
 	 */
 	public static function delete($family, $key)
 	{
-		if (isset(self::$cache[$family][$key])) {
-			unset(self::$cache[$family][$key]);
-			unset(self::$in_db[$family][$key]);
+		if (empty(self::$adapter)) {
+			self::init();
 		}
 
-		$ret = dba::delete('config', ['cat' => $family, 'k' => $key]);
-
-		return $ret;
+		return self::$adapter->delete($family, $key);
 	}
 }

src/Core/Config/IConfigAdapter.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Friendica\Core\Config;
+
+/**
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+interface IConfigAdapter
+{
+	/**
+	 * @brief Loads all configuration values into a cached storage.
+	 *
+	 * All configuration values of the system are stored in global cache
+	 * which is available under the global variable $a->config
+	 *
+	 * @param string  $cat The category of the configuration values to load
+	 *
+	 * @return void
+	 */
+	public function load($cat = "config");
+
+	/**
+	 * @brief Get a particular user's config variable given the category name
+	 * ($family) and a key.
+	 *
+	 * Get a particular config value from the given category ($family)
+	 * and the $key from a cached storage in $a->config[$uid].
+	 * $instore is only used by the set_config function
+	 * to determine if the key already exists in the DB
+	 * If a key is found in the DB but doesn't exist in
+	 * local config cache, pull it into the cache so we don't have
+	 * to hit the DB again for this item.
+	 *
+	 * @param string  $cat           The category of the configuration value
+	 * @param string  $k             The configuration key to query
+	 * @param mixed   $default_value optional, The value to return if key is not set (default: null)
+	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
+	 *
+	 * @return mixed Stored value or null if it does not exist
+	 */
+	public function get($cat, $k, $default_value = null, $refresh = false);
+
+	/**
+	 * @brief Sets a configuration value for system config
+	 *
+	 * Stores a config value ($value) in the category ($family) under the key ($key)
+	 * for the user_id $uid.
+	 *
+	 * Note: Please do not store booleans - convert to 0/1 integer values!
+	 *
+	 * @param string $family The category of the configuration value
+	 * @param string $key    The configuration key to set
+	 * @param mixed  $value  The value to store
+	 *
+	 * @return mixed Stored $value or false if the database update failed
+	 */
+	public function set($cat, $k, $value);
+
+	/**
+	 * @brief Deletes the given key from the system configuration.
+	 *
+	 * Removes the configured value from the stored cache in $a->config
+	 * and removes it from the database.
+	 *
+	 * @param string $cat The category of the configuration value
+	 * @param string $k   The configuration key to delete
+	 *
+	 * @return mixed
+	 */
+	public function delete($cat, $k);
+}

src/Core/Config/IPConfigAdapter.php

@@ -0,0 +1,77 @@
+<?php
+
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+namespace Friendica\Core\Config;
+
+/**
+ *
+ * @author benlo
+ */
+interface IPConfigAdapter
+{
+	/**
+	 * @brief Loads all configuration values of a user's config family into a cached storage.
+	 *
+	 * All configuration values of the given user are stored in global cache
+	 * which is available under the global variable $a->config[$uid].
+	 *
+	 * @param string $uid The user_id
+	 * @param string $cat The category of the configuration value
+	 *
+	 * @return void
+	 */
+	public function load($uid, $cat);
+
+	/**
+	 * @brief Get a particular user's config variable given the category name
+	 * ($family) and a key.
+	 *
+	 * Get a particular user's config value from the given category ($family)
+	 * and the $key from a cached storage in $a->config[$uid].
+	 *
+	 * @param string  $uid           The user_id
+	 * @param string  $cat           The category of the configuration value
+	 * @param string  $k             The configuration key to query
+	 * @param mixed   $default_value optional, The value to return if key is not set (default: null)
+	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
+	 *
+	 * @return mixed Stored value or null if it does not exist
+	 */
+	public function get($uid, $cat, $k, $default_value = null, $refresh = false);
+
+	/**
+	 * @brief Sets a configuration value for a user
+	 *
+	 * Stores a config value ($value) in the category ($family) under the key ($key)
+	 * for the user_id $uid.
+	 *
+	 * @note Please do not store booleans - convert to 0/1 integer values!
+	 *
+	 * @param string $uid   The user_id
+	 * @param string $cat   The category of the configuration value
+	 * @param string $k     The configuration key to set
+	 * @param string $value The value to store
+	 *
+	 * @return mixed Stored $value or false
+	 */
+	public function set($uid, $cat, $k, $value);
+
+	/**
+	 * @brief Deletes the given key from the users's configuration.
+	 *
+	 * Removes the configured value from the stored cache in $a->config[$uid]
+	 * and removes it from the database.
+	 *
+	 * @param string $uid The user_id
+	 * @param string $cat The category of the configuration value
+	 * @param string $k   The configuration key to delete
+	 *
+	 * @return mixed
+	 */
+	public function delete($uid, $cat, $k);
+}

src/Core/Config/JITConfigAdapter.php

@@ -0,0 +1,126 @@
+<?php
+namespace Friendica\Core\Config;
+
+use dba;
+use Friendica\BaseObject;
+use Friendica\Database\DBM;
+
+require_once 'include/dba.php';
+
+/**
+ * JustInTime Configuration Adapter
+ *
+ * Default Config Adapter. Provides the best performance for pages loading few configuration variables.
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class JITConfigAdapter extends BaseObject implements IConfigAdapter
+{
+	private $cache;
+	private $in_db;
+
+	public function load($cat = "config")
+	{
+		// We don't preload "system" anymore.
+		// This reduces the number of database reads a lot.
+		if ($cat === 'system') {
+			return;
+		}
+
+		$configs = dba::select('config', ['v', 'k'], ['cat' => $cat]);
+		while ($config = dba::fetch($configs)) {
+			$k = $config['k'];
+
+			self::getApp()->setConfigValue($cat, $k, $config['v']);
+
+			if ($cat !== 'config') {
+				$this->cache[$cat][$k] = $config['v'];
+				$this->in_db[$cat][$k] = true;
+			}
+		}
+		dba::close($configs);
+	}
+
+	public function get($cat, $k, $default_value = null, $refresh = false)
+	{
+		$a = self::getApp();
+
+		if (!$refresh) {
+			// Do we have the cached value? Then return it
+			if (isset($this->cache[$cat][$k])) {
+				if ($this->cache[$cat][$k] === '!<unset>!') {
+					return $default_value;
+				} else {
+					return $this->cache[$cat][$k];
+				}
+			}
+		}
+
+		$config = dba::selectFirst('config', ['v'], ['cat' => $cat, 'k' => $k]);
+		if (DBM::is_result($config)) {
+			// manage array value
+			$value = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
+
+			// Assign the value from the database to the cache
+			$this->cache[$cat][$k] = $value;
+			$this->in_db[$cat][$k] = true;
+			return $value;
+		} elseif (isset($a->config[$cat][$k])) {
+			// Assign the value (mostly) from the .htconfig.php to the cache
+			$this->cache[$cat][$k] = $a->config[$cat][$k];
+			$this->in_db[$cat][$k] = false;
+
+			return $a->config[$cat][$k];
+		}
+
+		$this->cache[$cat][$k] = '!<unset>!';
+		$this->in_db[$cat][$k] = false;
+
+		return $default_value;
+	}
+
+	public function set($cat, $k, $value)
+	{
+		$a = self::getApp();
+
+		// We store our setting values in a string variable.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$dbvalue = (!is_array($value) ? (string)$value : $value);
+
+		$stored = $this->get($cat, $k, null, true);
+
+		if (($stored === $dbvalue) && $this->in_db[$cat][$k]) {
+			return true;
+		}
+
+		self::getApp()->setConfigValue($cat, $k, $value);
+
+		// Assign the just added value to the cache
+		$this->cache[$cat][$k] = $dbvalue;
+
+		// manage array value
+		$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
+
+		$result = dba::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $k], true);
+
+		if ($result) {
+			$this->in_db[$cat][$k] = true;
+			return $value;
+		}
+
+		return $result;
+	}
+
+	public function delete($cat, $k)
+	{
+		if (isset($this->cache[$cat][$k])) {
+			unset($this->cache[$cat][$k]);
+			unset($this->in_db[$cat][$k]);
+		}
+
+		$result = dba::delete('config', ['cat' => $cat, 'k' => $k]);
+
+		return $result;
+	}
+}

src/Core/Config/JITPConfigAdapter.php

@@ -0,0 +1,119 @@
+<?php
+namespace Friendica\Core\Config;
+
+use dba;
+use Friendica\BaseObject;
+use Friendica\Database\DBM;
+
+require_once 'include/dba.php';
+
+/**
+ * JustInTime User Configuration Adapter
+ *
+ * Default PConfig Adapter. Provides the best performance for pages loading few configuration variables.
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class JITPConfigAdapter extends BaseObject implements IPConfigAdapter
+{
+	private $in_db;
+
+	public function load($uid, $cat)
+	{
+		$a = self::getApp();
+
+		$pconfigs = dba::select('pconfig', ['v', 'k'], ['cat' => $cat, 'uid' => $uid]);
+		if (DBM::is_result($pconfigs)) {
+			while ($pconfig = dba::fetch($pconfigs)) {
+				$k = $pconfig['k'];
+
+				self::getApp()->setPConfigValue($uid, $cat, $k, $pconfig['v']);
+
+				$this->in_db[$uid][$cat][$k] = true;
+			}
+		} else if ($cat != 'config') {
+			// Negative caching
+			$a->config[$uid][$cat] = "!<unset>!";
+		}
+		dba::close($pconfigs);
+	}
+
+	public function get($uid, $cat, $k, $default_value = null, $refresh = false)
+	{
+		$a = self::getApp();
+
+		if (!$refresh) {
+			// Looking if the whole family isn't set
+			if (isset($a->config[$uid][$cat])) {
+				if ($a->config[$uid][$cat] === '!<unset>!') {
+					return $default_value;
+				}
+			}
+
+			if (isset($a->config[$uid][$cat][$k])) {
+				if ($a->config[$uid][$cat][$k] === '!<unset>!') {
+					return $default_value;
+				}
+				return $a->config[$uid][$cat][$k];
+			}
+		}
+
+		$pconfig = dba::selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $cat, 'k' => $k]);
+		if (DBM::is_result($pconfig)) {
+			$val = (preg_match("|^a:[0-9]+:{.*}$|s", $pconfig['v']) ? unserialize($pconfig['v']) : $pconfig['v']);
+
+			self::getApp()->setPConfigValue($uid, $cat, $k, $val);
+
+			$this->in_db[$uid][$cat][$k] = true;
+
+			return $val;
+		} else {
+			self::getApp()->setPConfigValue($uid, $cat, $k, '!<unset>!');
+
+			$this->in_db[$uid][$cat][$k] = false;
+
+			return $default_value;
+		}
+	}
+
+	public function set($uid, $cat, $k, $value)
+	{
+		// We store our setting values in a string variable.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$dbvalue = (!is_array($value) ? (string)$value : $value);
+
+		$stored = $this->get($uid, $cat, $k, null, true);
+
+		if (($stored === $dbvalue) && $this->in_db[$uid][$cat][$k]) {
+			return true;
+		}
+
+		self::getApp()->setPConfigValue($uid, $cat, $k, $value);
+
+		// manage array value
+		$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
+
+		$result = dba::update('pconfig', ['v' => $dbvalue], ['uid' => $uid, 'cat' => $cat, 'k' => $k], true);
+
+		if ($result) {
+			$this->in_db[$uid][$cat][$k] = true;
+			return $value;
+		}
+
+		return $result;
+	}
+
+	public function delete($uid, $cat, $k)
+	{
+		self::getApp()->deletePConfigValue($uid, $cat, $k);
+
+		if (!empty($this->in_db[$uid][$cat][$k])) {
+			unset($this->in_db[$uid][$cat][$k]);
+		}
+
+		$result = dba::delete('pconfig', ['uid' => $uid, 'cat' => $cat, 'k' => $k]);
+
+		return $result;
+	}
+}

src/Core/Config/PreloadConfigAdapter.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace Friendica\Core\Config;
+
+use dba;
+use Exception;
+use Friendica\App;
+use Friendica\BaseObject;
+use Friendica\Database\DBM;
+
+require_once 'include/dba.php';
+
+/**
+ * Preload Configuration Adapter
+ *
+ * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class PreloadConfigAdapter extends BaseObject implements IConfigAdapter
+{
+	private $config_loaded = false;
+
+	public function __construct()
+	{
+		$this->load();
+	}
+
+	public function load($family = 'config')
+	{
+		if ($this->config_loaded) {
+			return;
+		}
+
+		$configs = dba::select('config', ['cat', 'v', 'k']);
+		while ($config = dba::fetch($configs)) {
+			self::getApp()->setConfigValue($config['cat'], $config['k'], $config['v']);
+		}
+		dba::close($configs);
+
+		$this->config_loaded = true;
+	}
+
+	public function get($cat, $k, $default_value = null, $refresh = false)
+	{
+		if ($refresh) {
+			$config = dba::selectFirst('config', ['v'], ['cat' => $cat, 'k' => $k]);
+			if (DBM::is_result($config)) {
+				self::getApp()->setConfigValue($cat, $k, $config['v']);
+			}
+		}
+
+		$return = self::getApp()->getConfigValue($cat, $k, $default_value);
+
+		return $return;
+	}
+
+	public function set($cat, $k, $value)
+	{
+		// We store our setting values as strings.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$compare_value = !is_array($value) ? (string)$value : $value;
+
+		if (self::getApp()->getConfigValue($cat, $k) === $compare_value) {
+			return true;
+		}
+
+		self::getApp()->setConfigValue($cat, $k, $value);
+
+		// manage array value
+		$dbvalue = is_array($value) ? serialize($value) : $value;
+
+		$result = dba::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $k], true);
+		if (!$result) {
+			throw new Exception('Unable to store config value in [' . $cat . '][' . $k . ']');
+		}
+
+		return true;
+	}
+
+	public function delete($cat, $k)
+	{
+		self::getApp()->deleteConfigValue($cat, $k);
+
+		$result = dba::delete('config', ['cat' => $cat, 'k' => $k]);
+
+		return $result;
+	}
+}

src/Core/Config/PreloadPConfigAdapter.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace Friendica\Core\Config;
+
+use dba;
+use Exception;
+use Friendica\App;
+use Friendica\BaseObject;
+use Friendica\Database\DBM;
+
+require_once 'include/dba.php';
+
+/**
+ * Preload User Configuration Adapter
+ *
+ * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class PreloadPConfigAdapter extends BaseObject implements IPConfigAdapter
+{
+	private $config_loaded = false;
+
+	public function __construct($uid)
+	{
+		$this->load($uid, 'config');
+	}
+
+	public function load($uid, $family)
+	{
+		if ($this->config_loaded) {
+			return;
+		}
+
+		$pconfigs = dba::select('pconfig', ['cat', 'v', 'k'], ['uid' => $uid]);
+		while ($pconfig = dba::fetch($pconfigs)) {
+			self::getApp()->setPConfigValue($uid, $pconfig['cat'], $pconfig['k'], $pconfig['v']);
+		}
+		dba::close($pconfigs);
+
+		$this->config_loaded = true;
+	}
+
+	public function get($uid, $cat, $k, $default_value = null, $refresh = false)
+	{
+		if ($refresh) {
+			$config = dba::selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $cat, 'k' => $k]);
+			if (DBM::is_result($config)) {
+				self::getApp()->setPConfigValue($uid, $cat, $k, $config['v']);
+			} else {
+				self::getApp()->deletePConfigValue($uid, $cat, $k);
+			}
+		}
+
+		$return = self::getApp()->getPConfigValue($uid, $cat, $k, $default_value);
+
+		return $return;
+	}
+
+	public function set($uid, $cat, $k, $value)
+	{
+		// We store our setting values as strings.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$compare_value = !is_array($value) ? (string)$value : $value;
+
+		if (self::getApp()->getPConfigValue($uid, $cat, $k) === $compare_value) {
+			return true;
+		}
+
+		self::getApp()->setPConfigValue($uid, $cat, $k, $value);
+
+		// manage array value
+		$dbvalue = is_array($value) ? serialize($value) : $value;
+
+		$result = dba::update('pconfig', ['v' => $dbvalue], ['uid' => $uid, 'cat' => $cat, 'k' => $k], true);
+		if (!$result) {
+			throw new Exception('Unable to store config value in [' . $uid . '][' . $cat . '][' . $k . ']');
+		}
+
+		return true;
+	}
+
+	public function delete($uid, $cat, $k)
+	{
+		self::getApp()->deletePConfigValue($uid, $cat, $k);
+
+		$result = dba::delete('pconfig', ['uid' => $uid, 'cat' => $cat, 'k' => $k]);
+
+		return $result;
+	}
+}

src/Core/PConfig.php

@@ -1,20 +1,18 @@
 <?php
 /**
- * @file src/Core/PConfig.php
+ * User Configuration Class
+ *
+ * @file include/Core/PConfig.php
+ *
+ * @brief Contains the class with methods for user configuration
  */
 namespace Friendica\Core;
 
-use Friendica\Database\DBM;
-use dba;
+use Friendica\BaseObject;
+use Friendica\Core\Config;
 
 require_once 'include/dba.php';
 
-/**
- * @file include/Core/PConfig.php
- * @brief contains the class with methods for the management
- * of the user configuration
- */
-
 /**
  * @brief Management of user configuration storage
  * Note:
@@ -22,9 +20,23 @@ require_once 'include/dba.php';
  * The PConfig::get() functions return boolean false for keys that are unset,
  * and this could lead to subtle bugs.
  */
-class PConfig
+class PConfig extends BaseObject
 {
-	private static $in_db;
+	/**
+	 * @var Friendica\Core\Config\IPConfigAdapter
+	 */
+	private static $adapter = null;
+
+	public static function init($uid)
+	{
+		$a = self::getApp();
+
+		if (isset($a->config['system']['config_adapter']) && $a->config['system']['config_adapter'] == 'preload') {
+			self::$adapter = new Config\PreloadPConfigAdapter($uid);
+		} else {
+			self::$adapter = new Config\JITPConfigAdapter($uid);
+		}
+	}
 
 	/**
 	 * @brief Loads all configuration values of a user's config family into a cached storage.
@@ -39,20 +51,11 @@ class PConfig
 	 */
 	public static function load($uid, $family)
 	{
-		$a = get_app();
-
-		$r = dba::select('pconfig', ['v', 'k'], ['cat' => $family, 'uid' => $uid]);
-		if (DBM::is_result($r)) {
-			while ($rr = dba::fetch($r)) {
-				$k = $rr['k'];
-				$a->config[$uid][$family][$k] = $rr['v'];
-				self::$in_db[$uid][$family][$k] = true;
-			}
-		} else if ($family != 'config') {
-			// Negative caching
-			$a->config[$uid][$family] = "!<unset>!";
+		if (empty(self::$adapter)) {
+			self::init($uid);
 		}
-		dba::close($r);
+
+		self::$adapter->load($uid, $family);
 	}
 
 	/**
@@ -72,37 +75,11 @@ class PConfig
 	 */
 	public static function get($uid, $family, $key, $default_value = null, $refresh = false)
 	{
-		$a = get_app();
-
-		if (!$refresh) {
-			// Looking if the whole family isn't set
-			if (isset($a->config[$uid][$family])) {
-				if ($a->config[$uid][$family] === '!<unset>!') {
-					return $default_value;
-				}
-			}
-
-			if (isset($a->config[$uid][$family][$key])) {
-				if ($a->config[$uid][$family][$key] === '!<unset>!') {
-					return $default_value;
-				}
-				return $a->config[$uid][$family][$key];
-			}
+		if (empty(self::$adapter)) {
+			self::init($uid);
 		}
 
-		$pconfig = dba::selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $family, 'k' => $key]);
-		if (DBM::is_result($pconfig)) {
-			$val = (preg_match("|^a:[0-9]+:{.*}$|s", $pconfig['v']) ? unserialize($pconfig['v']) : $pconfig['v']);
-			$a->config[$uid][$family][$key] = $val;
-			self::$in_db[$uid][$family][$key] = true;
-
-			return $val;
-		} else {
-			$a->config[$uid][$family][$key] = '!<unset>!';
-			self::$in_db[$uid][$family][$key] = false;
-
-			return $default_value;
-		}
+		return self::$adapter->get($uid, $family, $key, $default_value, $refresh);
 	}
 
 	/**
@@ -122,31 +99,11 @@ class PConfig
 	 */
 	public static function set($uid, $family, $key, $value)
 	{
-		$a = get_app();
-
-		// We store our setting values in a string variable.
-		// So we have to do the conversion here so that the compare below works.
-		// The exception are array values.
-		$dbvalue = (!is_array($value) ? (string)$value : $value);
-
-		$stored = self::get($uid, $family, $key, null, true);
-
-		if (($stored === $dbvalue) && self::$in_db[$uid][$family][$key]) {
-			return true;
+		if (empty(self::$adapter)) {
+			self::init($uid);
 		}
 
-		$a->config[$uid][$family][$key] = $dbvalue;
-
-		// manage array value
-		$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
-
-		$ret = dba::update('pconfig', ['v' => $dbvalue], ['uid' => $uid, 'cat' => $family, 'k' => $key], true);
-
-		if ($ret) {
-			self::$in_db[$uid][$family][$key] = true;
-			return $value;
-		}
-		return $ret;
+		return self::$adapter->set($uid, $family, $key, $value);
 	}
 
 	/**
@@ -163,15 +120,10 @@ class PConfig
 	 */
 	public static function delete($uid, $family, $key)
 	{
-		$a = get_app();
-
-		if (x($a->config[$uid][$family], $key)) {
-			unset($a->config[$uid][$family][$key]);
-			unset(self::$in_db[$uid][$family][$key]);
+		if (empty(self::$adapter)) {
+			self::init($uid);
 		}
 
-		$ret = dba::delete('pconfig', ['uid' => $uid, 'cat' => $family, 'k' => $key]);
-
-		return $ret;
+		return self::$adapter->delete($uid, $family, $key);
 	}
 }