Add caching to AppConfig->getApps

lib/private/appconfig.php

@@ -51,6 +51,11 @@ class AppConfig implements \OCP\IAppConfig {
 
 	private $appsLoaded = array();
 
+	/**
+	 * @var string[]
+	 */
+	private $apps = null;
+
 	/**
 	 * @param \OC\DB\Connection $conn
 	 */
@@ -90,12 +95,16 @@ class AppConfig implements \OCP\IAppConfig {
 
 	/**
 	 * Get all apps using the config
+	 *
 	 * @return array an array of app ids
 	 *
 	 * This function returns a list of all apps that have at least one
 	 * entry in the appconfig table.
 	 */
 	public function getApps() {
+		if (is_array($this->apps)) {
+			return $this->apps;
+		}
 		$query = 'SELECT DISTINCT `appid` FROM `*PREFIX*appconfig` ORDER BY `appid`';
 		$result = $this->conn->executeQuery($query);
 
@@ -103,11 +112,13 @@ class AppConfig implements \OCP\IAppConfig {
 		while ($appid = $result->fetchColumn()) {
 			$apps[] = $appid;
 		}
+		$this->apps = $apps;
 		return $apps;
 	}
 
 	/**
 	 * Get the available keys for an app
+	 *
 	 * @param string $app the app we are looking for
 	 * @return array an array of key names
 	 *
@@ -123,6 +134,7 @@ class AppConfig implements \OCP\IAppConfig {
 
 	/**
 	 * Gets the config value
+	 *
 	 * @param string $app app
 	 * @param string $key key
 	 * @param string $default = null, default value if the key does not exist
@@ -142,6 +154,7 @@ class AppConfig implements \OCP\IAppConfig {
 
 	/**
 	 * check if a key is set in the appconfig
+	 *
 	 * @param string $app
 	 * @param string $key
 	 * @return bool
@@ -153,6 +166,7 @@ class AppConfig implements \OCP\IAppConfig {
 
 	/**
 	 * sets a value in the appconfig
+	 *
 	 * @param string $app app
 	 * @param string $key key
 	 * @param string $value value
@@ -181,11 +195,15 @@ class AppConfig implements \OCP\IAppConfig {
 		if (!isset($this->cache[$app])) {
 			$this->cache[$app] = array();
 		}
+		if (is_array($this->apps) and array_search($app, $this->apps) === false) {
+			$this->apps[] = $app;
+		}
 		$this->cache[$app][$key] = $value;
 	}
 
 	/**
 	 * Deletes a key
+	 *
 	 * @param string $app app
 	 * @param string $key key
 	 * @return boolean|null
@@ -203,6 +221,7 @@ class AppConfig implements \OCP\IAppConfig {
 
 	/**
 	 * Remove app from appconfig
+	 *
 	 * @param string $app app
 	 * @return boolean|null
 	 *
@@ -214,6 +233,10 @@ class AppConfig implements \OCP\IAppConfig {
 		);
 		$this->conn->delete('*PREFIX*appconfig', $where);
 		unset($this->cache[$app]);
+		if (is_array($this->apps) and $i = array_search($app, $this->apps) !== false) {
+			unset($this->apps[$i]);
+		}
+		$this->apps = null;
 	}
 
 	/**