Adding support for a file tracking add and touch times for applications for ordering them.

7 files changed, 598 insertions, 7 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index d9b7963..38e6dd9 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -35,6 +35,8 @@ indicator_application_service_SOURCES = \
 	application-service.c \
 	application-service-appstore.h \
 	application-service-appstore.c \
+	application-service-lru-file.h \
+	application-service-lru-file.c \
 	application-service-marshal.h \
 	application-service-marshal.c \
 	application-service-server.h \
diff --git a/src/application-service-appstore.c b/src/application-service-appstore.c
index d95007c..5b0cc15 100644
--- a/src/application-service-appstore.c
+++ b/src/application-service-appstore.c
@@ -52,6 +52,7 @@ typedef struct _ApplicationServiceAppstorePrivate ApplicationServiceAppstorePriv
 struct _ApplicationServiceAppstorePrivate {
 	DBusGConnection * bus;
 	GList * applications;
+	AppLruFile * lrufile;
 };
 
 #define APP_STATUS_PASSIVE_STR    "passive"
@@ -67,6 +68,8 @@ enum _ApplicationStatus {
 
 typedef struct _Application Application;
 struct _Application {
+	gchar * id;
+	gchar * category;
 	gchar * dbus_name;
 	gchar * dbus_object;
 	ApplicationServiceAppstore * appstore; /* not ref'd */
@@ -148,6 +151,7 @@ application_service_appstore_init (ApplicationServiceAppstore *self)
 	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(self);
 
 	priv->applications = NULL;
+	priv->lrufile = NULL;
 	
 	GError * error = NULL;
 	priv->bus = dbus_g_bus_get(DBUS_BUS_STARTER, &error);
@@ -201,6 +205,8 @@ get_all_properties_cb (DBusGProxy * proxy, GHashTable * properties, GError * err
 	Application * app = (Application *)data;
 
 	if (g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_MENU) == NULL ||
+			g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_ID) == NULL ||
+			g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_CATEGORY) == NULL ||
 			g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_STATUS) == NULL ||
 			g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_ICON_NAME) == NULL) {
 		g_warning("Notification Item on object %s of %s doesn't have enough properties.", app->dbus_object, app->dbus_name);
@@ -210,6 +216,11 @@ get_all_properties_cb (DBusGProxy * proxy, GHashTable * properties, GError * err
 
 	app->validated = TRUE;
 
+	app->id = g_value_dup_string(g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_ID));
+	app->category = g_value_dup_string(g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_CATEGORY));
+	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(app->appstore);
+	app_lru_file_touch(priv->lrufile, app->id, app->category);
+
 	app->icon = g_value_dup_string(g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_ICON_NAME));
 	app->menu = g_value_dup_string(g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_MENU));
 	if (g_hash_table_lookup(properties, NOTIFICATION_ITEM_PROP_AICON_NAME) != NULL) {
@@ -273,6 +284,12 @@ application_free (Application * app)
 		g_object_unref(app->prop_proxy);
 	}
 
+	if (app->id != NULL) {
+		g_free(app->id);
+	}
+	if (app->category != NULL) {
+		g_free(app->category);
+	}
 	if (app->dbus_name != NULL) {
 		g_free(app->dbus_name);
 	}
@@ -333,6 +350,18 @@ can_add_application (GList *applications, Application *app)
   return TRUE;
 }
 
+/* This function takes two Application structure
+   pointers and uses the lrufile to compare them. */
+static gint
+app_sort_func (gconstpointer a, gconstpointer b, gpointer userdata)
+{
+	Application * appa = (Application *)a;
+	Application * appb = (Application *)b;
+	AppLruFile * lrufile = (AppLruFile *)userdata;
+
+	return app_lru_file_sort(lrufile, appa->id, appb->id);
+}
+
 /* Change the status of the application.  If we're going passive
    it removes it from the panel.  If we're coming online, then
    it add it to the panel.  Otherwise it changes the icon. */
@@ -367,16 +396,12 @@ apply_status (Application * app, ApplicationStatus status)
 		if (app->status == APP_STATUS_PASSIVE) {
                         if (can_add_application (priv->applications, app)) {
                                 /* Put on panel */
-                                priv->applications = g_list_prepend (priv->applications, app);
-
-                                /* TODO: We need to have the position determined better.  This
-                                   would involve looking at the name and category and sorting
-                                   it with the other entries. */
+                                priv->applications = g_list_insert_sorted_with_data (priv->applications, app, app_sort_func, priv->lrufile);
 
                                 g_signal_emit(G_OBJECT(app->appstore),
                                               signals[APPLICATION_ADDED], 0,
                                               newicon,
-                                              0, /* Position */
+                                              g_list_index(priv->applications, app), /* Position */
                                               app->dbus_name,
                                               app->menu,
                                               app->icon_path,
@@ -645,6 +670,18 @@ application_service_appstore_application_remove (ApplicationServiceAppstore * ap
 	return;
 }
 
+/* Creates a basic appstore object and attaches the
+   LRU file object to it. */
+ApplicationServiceAppstore *
+application_service_appstore_new (AppLruFile * lrufile)
+{
+	g_return_val_if_fail(IS_APP_LRU_FILE(lrufile), NULL);
+	ApplicationServiceAppstore * appstore = APPLICATION_SERVICE_APPSTORE(g_object_new(APPLICATION_SERVICE_APPSTORE_TYPE, NULL));
+	ApplicationServiceAppstorePrivate * priv = APPLICATION_SERVICE_APPSTORE_GET_PRIVATE(appstore);
+	priv->lrufile = lrufile;
+	return appstore;
+}
+
 /* DBus Interface */
 static gboolean
 _application_service_server_get_applications (ApplicationServiceAppstore * appstore, GPtrArray ** apps, GError ** error)
diff --git a/src/application-service-appstore.h b/src/application-service-appstore.h
index 6bd7a01..d2e0013 100644
--- a/src/application-service-appstore.h
+++ b/src/application-service-appstore.h
@@ -25,6 +25,7 @@ with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <glib.h>
 #include <glib-object.h>
+#include "application-service-lru-file.h"
 
 G_BEGIN_DECLS
 
@@ -50,6 +51,7 @@ struct _ApplicationServiceAppstore {
 	GObject parent;
 };
 
+ApplicationServiceAppstore * application_service_appstore_new (AppLruFile * lrufile);
 GType application_service_appstore_get_type               (void);
 void  application_service_appstore_application_add        (ApplicationServiceAppstore *   appstore,
                                                       const gchar *             dbus_name,
diff --git a/src/application-service-lru-file.c b/src/application-service-lru-file.c
new file mode 100644
index 0000000..c69a20f
--- /dev/null
+++ b/src/application-service-lru-file.c
@@ -0,0 +1,473 @@
+/*
+This object manages the database of when the entires were touched
+and loved.  And writes that out to disk occationally as well.
+
+Copyright 2010 Canonical Ltd.
+
+Authors:
+    Ted Gould <ted@canonical.com>
+
+This program is free software: you can redistribute it and/or modify it 
+under the terms of the GNU General Public License version 3, as published 
+by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranties of 
+MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR 
+PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along 
+with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+#include <gio/gio.h>
+#include <json-glib/json-glib.h>
+#include "application-service-lru-file.h"
+
+#define ENTRY_CATEGORY   "category"
+#define ENTRY_FIRST_TIME "first-time"
+#define ENTRY_LAST_TIME  "last-time"
+#define ENTRY_VERSION    "version"
+
+#define CONFIG_DIR       ("indicators" G_DIR_SEPARATOR_S "application")
+#define CONFIG_FILE      "lru-file.json"
+
+typedef struct _AppLruFilePrivate AppLruFilePrivate;
+struct _AppLruFilePrivate {
+	GHashTable * apps;
+	gboolean dirty;
+	guint timer;
+	gchar * filename;
+};
+
+typedef struct _AppData AppData;
+struct _AppData {
+	gchar * category;
+	GTimeVal last_touched;
+	GTimeVal first_touched;
+};
+
+#define APP_LRU_FILE_GET_PRIVATE(o) \
+		(G_TYPE_INSTANCE_GET_PRIVATE ((o), APP_LRU_FILE_TYPE, AppLruFilePrivate))
+
+static void app_lru_file_class_init (AppLruFileClass *klass);
+static void app_lru_file_init       (AppLruFile *self);
+static void app_lru_file_dispose    (GObject *object);
+static void app_lru_file_finalize   (GObject *object);
+static void app_data_free           (gpointer data);
+static void get_dirty (AppLruFile * lrufile);
+static gboolean load_from_file      (gpointer data);
+static void load_file_object_cb (JsonObject * obj, const gchar * key, JsonNode * value, gpointer data);
+static void clean_off_hash_cb (gpointer key, gpointer value, gpointer data);
+static void clean_off_write_end_cb (GObject * obj, GAsyncResult * res, gpointer data);
+
+G_DEFINE_TYPE (AppLruFile, app_lru_file, G_TYPE_OBJECT);
+
+/* Set up the class variable stuff */
+static void
+app_lru_file_class_init (AppLruFileClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+	g_type_class_add_private (klass, sizeof (AppLruFilePrivate));
+
+	object_class->dispose = app_lru_file_dispose;
+	object_class->finalize = app_lru_file_finalize;
+
+	return;
+}
+
+/* Set all the data of the per-instance variables */
+static void
+app_lru_file_init (AppLruFile *self)
+{
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(self);
+
+	/* Default values */
+	priv->apps = NULL;
+	priv->dirty = FALSE;
+	priv->timer = 0;
+	priv->filename = NULL;
+
+	/* Now let's build some stuff */
+	priv->apps = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, app_data_free);
+	priv->filename = g_build_filename(g_get_user_config_dir(), CONFIG_DIR, CONFIG_FILE, NULL);
+
+	/* No reason to delay other stuff for this, we'll
+	   merge any values that get touched. */
+	g_idle_add(load_from_file, self);
+
+	return;
+}
+
+/* Get rid of objects and other big things */
+static void
+app_lru_file_dispose (GObject *object)
+{
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(object);
+
+	if (priv->timer != 0) {
+		g_source_remove(priv->timer);
+		priv->timer = 0;
+	}
+
+	if (priv->apps != NULL) {
+		/* Cleans up the keys and entries itself */
+		g_hash_table_destroy(priv->apps);
+		priv->apps = NULL;
+	}
+
+	G_OBJECT_CLASS (app_lru_file_parent_class)->dispose (object);
+	return;
+}
+
+/* Deallocate memory */
+static void
+app_lru_file_finalize (GObject *object)
+{
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(object);
+	
+	if (priv->filename != NULL) {
+		g_free(priv->filename);
+		priv->filename = NULL;
+	}
+
+	G_OBJECT_CLASS (app_lru_file_parent_class)->finalize (object);
+	return;
+}
+
+/* Takes an AppData structure and free's the
+   memory from it. */
+static void
+app_data_free (gpointer data)
+{
+	AppData * appdata = (AppData *)data;
+
+	if (appdata->category != NULL) {
+		g_free(appdata->category);
+	}
+
+	g_free(appdata);
+
+	return;
+}
+
+/* Loads all of the data out of a json file */
+static gboolean
+load_from_file (gpointer data)
+{
+	AppLruFile * lrufile = (AppLruFile *)data;
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(lrufile);
+
+	if (!g_file_test(priv->filename, G_FILE_TEST_EXISTS)) {
+		return FALSE;
+	}
+
+	JsonParser * parser = json_parser_new();
+
+	if (!json_parser_load_from_file(parser, priv->filename, NULL)) {
+		g_warning("Unable to parse JSON file '%s'", priv->filename);
+		g_object_unref(parser);
+		return FALSE;
+	}
+
+	JsonNode * root = json_parser_get_root(parser);
+	JsonObject * rootobj = json_node_get_object(root);
+	if (rootobj == NULL) {
+		g_warning("Malformed LRU file.  The root node is not an object.");
+		g_object_unref(parser);
+		return FALSE;
+	}
+
+	json_object_foreach_member(rootobj, load_file_object_cb, lrufile);
+
+	g_object_unref(parser);
+	return FALSE;
+}
+
+/* Looks at the various things that we need on a node, makes
+   sure that we have them, and then copies them into the
+   application hash table of love. */
+static void
+load_file_object_cb (JsonObject * rootobj, const gchar * key, JsonNode * value, gpointer data)
+{
+	AppLruFile * lrufile = (AppLruFile *)data;
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(lrufile);
+
+	/* We're not looking at this today. */
+	if (!g_strcmp0(key, ENTRY_VERSION)) {
+		return;
+	}
+
+	JsonObject * obj = json_node_get_object(value);
+	if (obj == NULL) {
+		g_warning("Data for node '%s' is not an object.", key);
+		return;
+	}
+
+	const gchar * obj_category = json_object_get_string_member(obj, ENTRY_CATEGORY);
+	const gchar * obj_first    = json_object_get_string_member(obj, ENTRY_FIRST_TIME);
+	const gchar * obj_last     = json_object_get_string_member(obj, ENTRY_LAST_TIME);
+
+	if (obj_category == NULL || obj_first == NULL || obj_last == NULL) {
+		g_warning("Node '%s' is missing data.  Got: ('%s', '%s', '%s')", key, obj_category, obj_first, obj_last);
+		get_dirty(lrufile);
+		return;
+	}
+
+	/* Check to see how old this entry is.  If it hasn't been
+	   used in the last year, we remove the cruft. */
+	GTimeVal currenttime;
+	g_get_current_time(&currenttime);
+	GDate * currentdate = g_date_new();
+	g_date_set_time_val(currentdate, &currenttime);
+
+	GTimeVal lasttouch;
+	g_time_val_from_iso8601(obj_last, &lasttouch);
+	GDate * lastdate = g_date_new();
+	g_date_set_time_val(lastdate, &lasttouch);
+
+	gint spread = g_date_days_between(lastdate, currentdate);
+
+	g_date_free(currentdate);
+	g_date_free(lastdate);
+
+	if (spread > 365) {
+		g_debug("Removing node '%s' as it's %d days old.", key, spread);
+		get_dirty(lrufile);
+		return;
+	}
+
+	/* See if we already have one of these.  It's a little bit
+	   unlikely, but since we're async, we need to check */
+	gpointer datapntr = g_hash_table_lookup(priv->apps, key);
+	if (datapntr == NULL) {
+		/* Build a new node */
+		AppData * appdata = g_new0(AppData, 1);
+		appdata->category = g_strdup(obj_category);
+		g_time_val_from_iso8601(obj_first, &appdata->first_touched);
+		g_time_val_from_iso8601(obj_last, &appdata->last_touched);
+
+		g_hash_table_insert(priv->apps, g_strdup(key), appdata);
+	} else {
+		/* Merge nodes */
+		AppData * appdata = (AppData *)datapntr;
+		GTimeVal temptime;
+		g_time_val_from_iso8601(obj_first, &temptime);
+
+		if (temptime.tv_sec < appdata->first_touched.tv_sec) {
+			g_time_val_from_iso8601(obj_first, &appdata->first_touched);
+		}
+	}
+
+	return;
+}
+
+/* Write out our cache to a file so that we can unmark the dirty
+   bit and be happy. */
+static gboolean
+clean_off (gpointer data)
+{
+	AppLruFile * lrufile = (AppLruFile *)data;
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(lrufile);
+	priv->timer = 0;
+
+	GError * error = NULL;
+	
+	/* Check to see if our directory exists.  Build it if not. */
+	gchar * dirname = g_build_filename(g_get_user_config_dir(), CONFIG_DIR, NULL);
+	if (!g_file_test(dirname, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR)) {
+		GFile * dirfile = g_file_new_for_path(dirname);
+		g_file_make_directory_with_parents(dirfile, NULL, NULL);
+		g_object_unref(dirfile);
+	}
+	g_free(dirname);
+
+	GFile * file = g_file_new_for_path(priv->filename);
+	GFileOutputStream * ostream = g_file_replace(file,
+	                                             NULL, /* etag */
+	                                             TRUE, /* backup */
+	                                             G_FILE_CREATE_NONE, /* flags */
+	                                             NULL, /* cancelable */
+	                                             &error);
+	if (error != NULL) {
+		g_warning("Unable to open a file to store LRU file: %s", error->message);
+		return FALSE;
+	}
+
+	/* This is how the file will start */
+	GString * filestring = g_string_new("{\n  \"" ENTRY_VERSION "\": 1");
+
+	/* Put the middle in. */
+	g_hash_table_foreach (priv->apps, clean_off_hash_cb, filestring);
+
+	/* And then tack on the end. */
+	g_string_append(filestring, "\n}\n");
+	gchar * filedata = g_string_free(filestring, FALSE);
+	g_output_stream_write_async(G_OUTPUT_STREAM(ostream),
+	                            filedata,
+	                            strlen(filedata),
+	                            G_PRIORITY_DEFAULT_IDLE,
+	                            NULL,
+	                            clean_off_write_end_cb,
+	                            filedata);
+
+	return FALSE; /* drop the timer */
+}
+
+/* Looks at every value in the applications hash table and
+   turns it into a string for writing out. */
+static void
+clean_off_hash_cb (gpointer key, gpointer value, gpointer data)
+{
+	/* Mega-cast */
+	gchar * id = (gchar *)key;
+	AppData * appdata = (AppData *)value;
+	GString * string = (GString *)data;
+
+	gchar * firsttime = g_time_val_to_iso8601(&appdata->first_touched);
+	gchar * lasttime = g_time_val_to_iso8601(&appdata->last_touched);
+
+	g_string_append_printf(string, ",\n  \"%s\": { \"" ENTRY_FIRST_TIME "\": \"%s\", \"" ENTRY_LAST_TIME "\": \"%s\", \"" ENTRY_CATEGORY "\": \"%s\"}", id, firsttime, lasttime, appdata->category);
+
+	g_free(lasttime);
+	g_free(firsttime);
+
+	return;
+}
+
+/* Very much like clean_off_write_cb except that it is the
+   last actor on this Output Stream so it closes it. */
+static void
+clean_off_write_end_cb (GObject * obj, GAsyncResult * res, gpointer data)
+{
+	g_free(data);
+
+	GError * error = NULL;
+	g_output_stream_close(G_OUTPUT_STREAM(obj), NULL, &error);
+
+	if (error != NULL) {
+		g_warning("Unable to close LRU File: %s", error->message);
+		g_error_free(error);
+	}
+
+	return;
+}
+
+/* Sets the dirty bit if not already set and makes sure that
+   we have a timer to fix that at some point. */
+static void
+get_dirty (AppLruFile * lrufile)
+{
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(lrufile);
+
+	priv->dirty = TRUE;
+
+	if (priv->timer == 0) {
+		priv->timer = g_timeout_add_seconds(60, clean_off, lrufile);
+	}
+
+	return;
+}
+
+/* API */
+
+/* Simple helper to create a new object */
+AppLruFile *
+app_lru_file_new (void)
+{
+	return APP_LRU_FILE(g_object_new(APP_LRU_FILE_TYPE, NULL));
+}
+
+/* This updates the timestamp for a particular
+   entry in the database.  It also queues up a 
+   write out of the database.  But that'll happen
+   later. */
+void
+app_lru_file_touch (AppLruFile * lrufile, const gchar * id, const gchar * category)
+{
+	g_return_if_fail(IS_APP_LRU_FILE(lrufile));
+	g_return_if_fail(id != NULL && id[0] != '\0');
+	g_return_if_fail(category != NULL && category[0] != '\0');
+
+	AppData * appdata = NULL;
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(lrufile);
+	gpointer data = g_hash_table_lookup(priv->apps, id);
+
+	if (data == NULL) {
+		/* Oh, we don't have one, let's build it and put it
+		   into the hash table ourselves */
+		appdata = g_new0(AppData, 1);
+
+		appdata->category = g_strdup(category);
+		g_get_current_time(&(appdata->first_touched));
+		/* NOTE: last touched set below */
+
+		g_hash_table_insert(priv->apps, g_strdup(id), appdata);
+	} else {
+		/* Boring, we've got this one already */
+		appdata = (AppData *)data;
+	}
+
+	/* Touch it and mark the DB as dirty */
+	g_get_current_time(&(appdata->last_touched));
+	get_dirty(lrufile);
+	return;
+}
+
+/* Used to sort or compare different applications. */
+gint
+app_lru_file_sort (AppLruFile * lrufile, const gchar * id_a, const gchar * id_b)
+{
+	g_return_val_if_fail(IS_APP_LRU_FILE(lrufile), -1);
+
+	/* Let's first look to see if the IDs are the same, this
+	   really shouldn't happen, but it'll be confusing if we
+	   don't get it out of the way to start. */
+	if (g_strcmp0(id_a, id_b) == 0) {
+		return 0;
+	}
+
+	AppLruFilePrivate * priv = APP_LRU_FILE_GET_PRIVATE(lrufile);
+
+	/* Now make sure we have app data for both of these.  If
+	   not we'll assume that the one without is newer? */
+	gpointer data_a = g_hash_table_lookup(priv->apps, id_a);
+	if (data_a == NULL) {
+		return -1;
+	}
+
+	gpointer data_b = g_hash_table_lookup(priv->apps, id_b);
+	if (data_b == NULL) {
+		return 1;
+	}
+
+	/* Ugly casting */
+	AppData * appdata_a = (AppData *)data_a;
+	AppData * appdata_b = (AppData *)data_b;
+
+	/* Look at categories, we'll put the categories in alpha
+	   order if they're not the same. */
+	gint catcompare = g_strcmp0(appdata_a->category, appdata_b->category);
+	if (catcompare != 0) {
+		return catcompare;
+	}
+
+	/* Now we're looking at the first time that these two were
+	   seen in this account.  Only using seconds.  I mean, seriously. */
+	if (appdata_a->first_touched.tv_sec < appdata_b->first_touched.tv_sec) {
+		return -1;
+	}
+	if (appdata_b->first_touched.tv_sec < appdata_a->first_touched.tv_sec) {
+		return 1;
+	}
+
+	/* Eh, this seems roughly impossible.  But if we have to choose,
+	   I like A better. */
+	return 1;
+}
diff --git a/src/application-service-lru-file.h b/src/application-service-lru-file.h
new file mode 100644
index 0000000..7c92c82
--- /dev/null
+++ b/src/application-service-lru-file.h
@@ -0,0 +1,59 @@
+/*
+This object manages the database of when the entires were touched
+and loved.  And writes that out to disk occationally as well.
+
+Copyright 2010 Canonical Ltd.
+
+Authors:
+    Ted Gould <ted@canonical.com>
+
+This program is free software: you can redistribute it and/or modify it 
+under the terms of the GNU General Public License version 3, as published 
+by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranties of 
+MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR 
+PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along 
+with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __APP_LRU_FILE_H__
+#define __APP_LRU_FILE_H__
+
+#include <glib.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define APP_LRU_FILE_TYPE            (app_lru_file_get_type ())
+#define APP_LRU_FILE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), APP_LRU_FILE_TYPE, AppLruFile))
+#define APP_LRU_FILE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), APP_LRU_FILE_TYPE, AppLruFileClass))
+#define IS_APP_LRU_FILE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), APP_LRU_FILE_TYPE))
+#define IS_APP_LRU_FILE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), APP_LRU_FILE_TYPE))
+#define APP_LRU_FILE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), APP_LRU_FILE_TYPE, AppLruFileClass))
+
+typedef struct _AppLruFile      AppLruFile;
+typedef struct _AppLruFileClass AppLruFileClass;
+
+struct _AppLruFileClass {
+	GObjectClass parent_class;
+
+};
+
+struct _AppLruFile {
+	GObject parent;
+
+};
+
+GType app_lru_file_get_type (void);
+
+AppLruFile * app_lru_file_new (void);
+void app_lru_file_touch (AppLruFile * lrufile, const gchar * id, const gchar * category);
+gint app_lru_file_sort  (AppLruFile * lrufile, const gchar * id_a, const gchar * id_b);
+
+G_END_DECLS
+
+#endif
diff --git a/src/application-service.c b/src/application-service.c
index 351e9aa..ffd042e 100644
--- a/src/application-service.c
+++ b/src/application-service.c
@@ -25,6 +25,7 @@ with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "notification-item-client.h"
 #include "application-service-appstore.h"
 #include "application-service-watcher.h"
+#include "application-service-lru-file.h"
 #include "dbus-shared.h"
 
 /* The base main loop */
@@ -35,6 +36,8 @@ static ApplicationServiceAppstore * appstore = NULL;
 static ApplicationServiceWatcher * watcher = NULL;
 /* The service management interface */
 static IndicatorService * service = NULL;
+/* The LRU file interface */
+static AppLruFile * lrufile = NULL;
 
 /* Recieves the disonnection signal from the service
    object and closes the mainloop. */
@@ -59,8 +62,11 @@ main (int argc, char ** argv)
 	service = indicator_service_new(INDICATOR_APPLICATION_DBUS_ADDR);
 	g_signal_connect(G_OBJECT(service), INDICATOR_SERVICE_SIGNAL_SHUTDOWN, G_CALLBACK(service_disconnected), NULL);
 
+	/* Start up the LRU file reading */
+	lrufile = app_lru_file_new();
+
 	/* Building our app store */
-	appstore = APPLICATION_SERVICE_APPSTORE(g_object_new(APPLICATION_SERVICE_APPSTORE_TYPE, NULL));
+	appstore = application_service_appstore_new(lrufile);
 
 	/* Adding a watcher for the Apps coming up */
 	watcher = application_service_watcher_new(appstore);
@@ -73,6 +79,7 @@ main (int argc, char ** argv)
 	g_object_unref(G_OBJECT(watcher));
 	g_object_unref(G_OBJECT(appstore));
 	g_object_unref(G_OBJECT(service));
+	g_object_unref(G_OBJECT(lrufile));
 
 	return 0;
 }
diff --git a/src/indicator-application.c b/src/indicator-application.c
index 5ed7a9e..3ef5688 100644
--- a/src/indicator-application.c
+++ b/src/indicator-application.c
@@ -92,6 +92,7 @@ static void indicator_application_init       (IndicatorApplication *self);
 static void indicator_application_dispose    (GObject *object);
 static void indicator_application_finalize   (GObject *object);
 static GList * get_entries (IndicatorObject * io);
+static guint get_location (IndicatorObject * io, IndicatorObjectEntry * entry);
 static void connected (IndicatorServiceManager * sm, gboolean connected, IndicatorApplication * application);
 static void application_added (DBusGProxy * proxy, const gchar * iconname, gint position, const gchar * dbusaddress, const gchar * dbusobject, const gchar * icon_path, IndicatorApplication * application);
 static void application_removed (DBusGProxy * proxy, gint position , IndicatorApplication * application);
@@ -116,6 +117,7 @@ indicator_application_class_init (IndicatorApplicationClass *klass)
 	IndicatorObjectClass * io_class = INDICATOR_OBJECT_CLASS(klass);
 
 	io_class->get_entries = get_entries;
+	io_class->get_location = get_location;
 
 	dbus_g_object_register_marshaller(_application_service_marshal_VOID__STRING_INT_STRING_STRING_STRING,
 	                                  G_TYPE_NONE,
@@ -298,6 +300,15 @@ get_entries (IndicatorObject * io)
 	return retval;
 }
 
+/* Finds the location of a specific entry */
+static guint 
+get_location (IndicatorObject * io, IndicatorObjectEntry * entry)
+{
+	g_return_val_if_fail(IS_INDICATOR_APPLICATION(io), 0);
+	IndicatorApplicationPrivate * priv = INDICATOR_APPLICATION_GET_PRIVATE(io);
+	return g_list_index(priv->applications, entry);
+}
+
 /* Here we respond to new applications by building up the
    ApplicationEntry and signaling the indicator host that
    we've got a new indicator. */