Config FollowUp

- New Configuration (Config is now only holding the instance)
- New PConfiguration (PConfig is now only holding the instance)

- Config & PConfig-Adapter don't need "ConfigCache" anymore

- DB-Connection is now outside App->reload() for better dependency-chaining

src/Core/Config/Adapter/IPConfigAdapter.php

@@ -0,0 +1,72 @@
+<?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\Adapter;
+
+/**
+ *
+ * @author benlo
+ */
+interface IPConfigAdapter
+{
+	/**
+	 * Loads all configuration values of a user's config family into a cached storage.
+	 *
+	 * @param string $uid The user_id
+	 * @param string $cat The category of the configuration value
+	 *
+	 * @return array
+	 */
+	public function load($uid, $cat);
+
+	/**
+	 * Get a particular user's config variable given the category name
+	 * ($family) and a key.
+	 *
+	 * @param string  $uid           The user_id
+	 * @param string  $cat           The category of the configuration value
+	 * @param string  $key           The configuration key to query
+	 *
+	 * @return mixed Stored value or "!<unset>!" if it does not exist
+	 */
+	public function get($uid, $cat, $key);
+
+	/**
+	 * Stores a config value ($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 $key   The configuration key to set
+	 * @param string $value The value to store
+	 *
+	 * @return bool Operation success
+	 */
+	public function set($uid, $cat, $key, $value);
+
+	/**
+	 * Removes the configured value from the stored cache
+	 * and removes it from the database.
+	 *
+	 * @param string $uid The user_id
+	 * @param string $cat The category of the configuration value
+	 * @param string $key The configuration key to delete
+	 *
+	 * @return bool
+	 */
+	public function delete($uid, $cat, $key);
+
+	/**
+	 * Checks, if the current adapter is connected to the backend
+	 *
+	 * @return bool
+	 */
+	public function isConnected();
+}