From 937119200300ebc2b09df4354fb7cd547535ecfb Mon Sep 17 00:00:00 2001
From: Steve Clay <steve@mrclay.org>
Date: Mon, 26 Nov 2012 17:31:53 -0500
Subject: Refs #4933: cache in plugin constructor, remove $CONFIG

---
 engine/classes/ElggPlugin.php |  7 +++--
 engine/lib/plugins.php        | 69 +++++++++++++++++++------------------------
 2 files changed, 36 insertions(+), 40 deletions(-)

diff --git a/engine/classes/ElggPlugin.php b/engine/classes/ElggPlugin.php
index 3e43c8e81..c6ce2905f 100644
--- a/engine/classes/ElggPlugin.php
+++ b/engine/classes/ElggPlugin.php
@@ -36,8 +36,9 @@ class ElggPlugin extends ElggObject {
 	 * @warning Unlike other ElggEntity objects, you cannot null instantiate
 	 *          ElggPlugin. You must point it to an actual plugin GUID or location.
 	 *
-	 * @param mixed $plugin The GUID of the ElggPlugin object or the path of
-	 *                      the plugin to load.
+	 * @param mixed $plugin The GUID of the ElggPlugin object or the path of the plugin to load.
+	 *
+	 * @throws PluginException
 	 */
 	public function __construct($plugin) {
 		if (!$plugin) {
@@ -76,6 +77,8 @@ class ElggPlugin extends ElggObject {
 			// load the rest of the plugin
 			parent::__construct($existing_guid);
 		}
+
+		_elgg_cache_plugin_by_id($this);
 	}
 
 	/**
diff --git a/engine/lib/plugins.php b/engine/lib/plugins.php
index 127d4bf8e..ca4a957f4 100644
--- a/engine/lib/plugins.php
+++ b/engine/lib/plugins.php
@@ -107,7 +107,6 @@ function elgg_generate_plugin_entities() {
 	$old_access = access_get_show_hidden_status();
 	access_show_hidden_entities(true);
 	$known_plugins = elgg_get_entities_from_relationship($options);
-	_elgg_add_plugin_ids_mapping($known_plugins);
 
 	if (!$known_plugins) {
 		$known_plugins = array();
@@ -152,7 +151,6 @@ function elgg_generate_plugin_entities() {
 			// priority is force to last in save() if not set.
 			$plugin = new ElggPlugin($plugin_id);
 			$plugin->save();
-			_elgg_add_plugin_ids_mapping(array($plugin));
 		}
 	}
 
@@ -178,22 +176,16 @@ function elgg_generate_plugin_entities() {
 }
 
 /**
- * Registers given plugins in plugin_id to entity mapping data structure
+ * Cache a reference to this plugin by its ID
  * 
- * @param array $plugins ElggPlugin instances to be registered 
+ * @param ElggPlugin $plugin
  * 
  * @access private
  */
-function _elgg_add_plugin_ids_mapping($plugins) {
-	global $CONFIG;
-	if (!is_array($CONFIG->plugin_ids_mapping)) {
-		$CONFIG->plugin_ids_mapping = array();
-	}
-	foreach ($plugins as $plugin) {
-		if ($plugin instanceof ElggPlugin) {
-			$CONFIG->plugin_ids_mapping[$plugin->getID()] = $plugin;
-		}
-	}
+function _elgg_cache_plugin_by_id(ElggPlugin $plugin) {
+	$map = (array) elgg_get_config('plugins_by_id_map');
+	$map[$plugin->getID()] = $plugin;
+	elgg_set_config('plugins_by_id_map', $map);
 }
 
 /**
@@ -204,30 +196,29 @@ function _elgg_add_plugin_ids_mapping($plugins) {
  * @since 1.8.0
  */
 function elgg_get_plugin_from_id($plugin_id) {
-	global $CONFIG;
-	if (isset($CONFIG->plugin_ids_mapping[$plugin_id])) {
-		return $CONFIG->plugin_ids_mapping[$plugin_id];
-	} else {
-		$plugin_id = sanitize_string($plugin_id);
-		$db_prefix = get_config('dbprefix');
-	
-		$options = array(
-			'type' => 'object',
-			'subtype' => 'plugin',
-			'joins' => array("JOIN {$db_prefix}objects_entity oe on oe.guid = e.guid"),
-			'wheres' => array("oe.title = '$plugin_id'"),
-			'limit' => 1
-		);
-	
-		$plugins = elgg_get_entities($options);
-	
-		if ($plugins) {
-			_elgg_add_plugin_ids_mapping($plugins);
-			return $plugins[0];
-		}
-	
-		return false;
+	$map = (array) elgg_get_config('plugins_by_id_map');
+	if (isset($map[$plugin_id])) {
+		return $map[$plugin_id];
+	}
+
+	$plugin_id = sanitize_string($plugin_id);
+	$db_prefix = get_config('dbprefix');
+
+	$options = array(
+		'type' => 'object',
+		'subtype' => 'plugin',
+		'joins' => array("JOIN {$db_prefix}objects_entity oe on oe.guid = e.guid"),
+		'wheres' => array("oe.title = '$plugin_id'"),
+		'limit' => 1
+	);
+
+	$plugins = elgg_get_entities($options);
+
+	if ($plugins) {
+		return $plugins[0];
 	}
+
+	return false;
 }
 
 /**
@@ -417,7 +408,6 @@ function elgg_get_plugins($status = 'active', $site_guid = null) {
 
 	$old_ia = elgg_set_ignore_access(true);
 	$plugins = elgg_get_entities_from_relationship($options);
-	_elgg_add_plugin_ids_mapping($plugins);
 	elgg_set_ignore_access($old_ia);
 
 	return $plugins;
@@ -540,6 +530,8 @@ function elgg_namespace_plugin_private_setting($type, $name, $id = null) {
  * @return string|false Plugin name, or false if no plugin name was called
  * @since 1.8.0
  * @access private
+ *
+ * @todo get rid of this
  */
 function elgg_get_calling_plugin_id($mainfilename = false) {
 	if (!$mainfilename) {
@@ -948,6 +940,7 @@ function elgg_set_plugin_setting($name, $value, $plugin_id = null) {
  *
  * @return mixed
  * @since 1.8.0
+ * @todo make $plugin_id required in future version
  */
 function elgg_get_plugin_setting($name, $plugin_id = null) {
 	if ($plugin_id) {
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