session-item: add id property

Makes it easier when handling session items in Lua

lib/wp/session-item.c

@@ -26,12 +26,14 @@ enum {
 typedef struct _WpSessionItemPrivate WpSessionItemPrivate;
 struct _WpSessionItemPrivate
 {
+  guint id;
   GWeakRef parent;
   WpProperties *properties;
 };
 
 enum {
   PROP_0,
+  PROP_ID,
   PROP_PROPERTIES,
 };
 
@@ -41,11 +43,20 @@ enum {
 G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (WpSessionItem, wp_session_item,
     WP_TYPE_OBJECT)
 
+static guint
+get_next_id ()
+{
+  static guint next_id = 0;
+  g_atomic_int_inc (&next_id);
+  return next_id;
+}
+
 static void
 wp_session_item_init (WpSessionItem * self)
 {
   WpSessionItemPrivate *priv = wp_session_item_get_instance_private (self);
 
+  priv->id = get_next_id ();
   g_weak_ref_init (&priv->parent, NULL);
   priv->properties = NULL;
 }
@@ -86,8 +97,12 @@ wp_session_item_get_property (GObject * object, guint property_id,
     GValue * value, GParamSpec * pspec)
 {
   WpSessionItem *self = WP_SESSION_ITEM (object);
+  WpSessionItemPrivate *priv = wp_session_item_get_instance_private (self);
 
   switch (property_id) {
+  case PROP_ID:
+    g_value_set_uint (value, priv->id);
+    break;
   case PROP_PROPERTIES:
     g_value_set_boxed (value, wp_session_item_get_properties (self));
     break;
@@ -204,6 +219,11 @@ wp_session_item_class_init (WpSessionItemClass * klass)
 
   klass->reset = wp_session_item_default_reset;
 
+  g_object_class_install_property (object_class, PROP_ID,
+      g_param_spec_uint ("id", "id",
+          "The session item unique id", 0, G_MAXUINT, 0,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
   g_object_class_install_property (object_class, PROP_PROPERTIES,
       g_param_spec_boxed ("properties", "properties",
           "The session item properties", WP_TYPE_PROPERTIES,
@@ -248,6 +268,23 @@ wp_session_item_set_parent (WpSessionItem *self, WpSessionItem *parent)
   g_weak_ref_set (&priv->parent, parent);
 }
 
+/**
+ * wp_session_item_get_id:
+ * @self: the session item
+ *
+ * Gets the unique Id of the session item
+ */
+guint
+wp_session_item_get_id (WpSessionItem * self)
+{
+  WpSessionItemPrivate *priv = NULL;
+
+  g_return_val_if_fail (WP_IS_SESSION_ITEM (self), SPA_ID_INVALID);
+
+  priv = wp_session_item_get_instance_private (self);
+  return priv->id;
+}
+
 /**
  * wp_session_item_reset: (virtual reset)
  * @self: the session item

lib/wp/session-item.h

@@ -69,6 +69,11 @@ WpSessionItem * wp_session_item_get_parent (WpSessionItem * self);
 WP_PRIVATE_API
 void wp_session_item_set_parent (WpSessionItem *self, WpSessionItem *parent);
 
+/* Id */
+
+WP_API
+guint wp_session_item_get_id (WpSessionItem * self);
+
 /* configuration */
 
 WP_API