[tracker/wip/carlosg/update-perf: 4/43] libtracker-sparql: Add private call to determine if a resource is a blank node

[Carlos Garnacho <carlosg src gnome org>]

commit a13633e4145e2202749db78d2d397c7defd75b5a
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 20 14:01:39 2022 +0200

    libtracker-sparql: Add private call to determine if a resource is a blank node
    
    Currently, we always go ahead at generating blank node labels, even though the
    resource might get an identifier assigned later on, the blank node label never
    be relevant, etc... Make this a bit easier for mass TrackerResource generation
    and avoid generating blank node labels until we are quite sure that the
    resource is being referenced somewhere else.

 src/libtracker-sparql/tracker-private.h  |  2 +
 src/libtracker-sparql/tracker-resource.c | 90 +++++++++++++-------------------
 2 files changed, 38 insertions(+), 54 deletions(-)
---
diff --git a/src/libtracker-sparql/tracker-private.h b/src/libtracker-sparql/tracker-private.h
index 8e3027486..d6263621b 100644
--- a/src/libtracker-sparql/tracker-private.h
+++ b/src/libtracker-sparql/tracker-private.h
@@ -329,5 +329,7 @@ void tracker_resource_iterator_init (TrackerResourceIterator *iter,
 gboolean tracker_resource_iterator_next (TrackerResourceIterator  *iter,
                                          const gchar             **property,
                                          const GValue            **value);
+const gchar * tracker_resource_get_identifier_internal (TrackerResource *resource);
+gboolean tracker_resource_is_blank_node (TrackerResource *resource);
 
 #endif /* __TRACKER_PRIVATE_H__ */
diff --git a/src/libtracker-sparql/tracker-resource.c b/src/libtracker-sparql/tracker-resource.c
index a59d98ebb..c027eecee 100644
--- a/src/libtracker-sparql/tracker-resource.c
+++ b/src/libtracker-sparql/tracker-resource.c
@@ -82,7 +82,6 @@ enum {
 };
 
 static void dispose      (GObject *object);
-static void constructed  (GObject *object);
 static void finalize     (GObject *object);
 static void get_property (GObject    *object,
                           guint       param_id,
@@ -100,7 +99,6 @@ tracker_resource_class_init (TrackerResourceClass *klass)
        GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
        object_class->dispose      = dispose;
-       object_class->constructed  = constructed;
        object_class->finalize     = finalize;
        object_class->get_property = get_property;
        object_class->set_property = set_property;
@@ -161,20 +159,6 @@ dispose (GObject *object)
        G_OBJECT_CLASS (tracker_resource_parent_class)->dispose (object);
 }
 
-static void
-constructed (GObject *object)
-{
-       TrackerResourcePrivate *priv;
-
-       priv = GET_PRIVATE (TRACKER_RESOURCE (object));
-
-       if (! priv->identifier) {
-               priv->identifier = generate_blank_node_identifier ();
-       }
-
-       G_OBJECT_CLASS (tracker_resource_parent_class)->constructed (object);
-}
-
 static void
 finalize (GObject *object)
 {
@@ -182,9 +166,7 @@ finalize (GObject *object)
 
        priv = GET_PRIVATE (TRACKER_RESOURCE (object));
 
-       if (priv->identifier) {
-               g_free (priv->identifier);
-       }
+       g_clear_pointer (&priv->identifier, g_free);
 
        (G_OBJECT_CLASS (tracker_resource_parent_class)->finalize)(object);
 }
@@ -195,13 +177,9 @@ get_property (GObject    *object,
               GValue     *value,
               GParamSpec *pspec)
 {
-       TrackerResourcePrivate *priv;
-
-       priv = GET_PRIVATE (TRACKER_RESOURCE (object));
-
        switch (param_id) {
        case PROP_IDENTIFIER:
-               g_value_set_string (value, priv->identifier);
+               g_value_set_string (value, tracker_resource_get_identifier (TRACKER_RESOURCE (object)));
                break;
        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
@@ -855,6 +833,9 @@ tracker_resource_get_identifier (TrackerResource *self)
 
        priv = GET_PRIVATE (self);
 
+       if (!priv->identifier)
+               priv->identifier = generate_blank_node_identifier ();
+
        return priv->identifier;
 }
 
@@ -881,19 +862,8 @@ tracker_resource_set_identifier (TrackerResource *self,
 
        priv = GET_PRIVATE (self);
 
-       g_free (priv->identifier);
-
-       if (identifier == NULL) {
-               /* We take NULL to mean "this is a blank node", and generate a
-                * unique blank node identifier right away. This is easier than
-                * leaving it NULL and trying to generate a blank node ID at
-                * serialization time, and it means that the serialization
-                * output is stable when called multiple times.
-                */
-               priv->identifier = generate_blank_node_identifier ();
-       } else {
-               priv->identifier = g_strdup (identifier);
-       }
+       g_clear_pointer (&priv->identifier, g_free);
+       priv->identifier = g_strdup (identifier);
 }
 
 /**
@@ -911,14 +881,10 @@ gint
 tracker_resource_identifier_compare_func (TrackerResource *resource,
                                           const char      *identifier)
 {
-       TrackerResourcePrivate *priv;
-
        g_return_val_if_fail (TRACKER_IS_RESOURCE (resource), 0);
        g_return_val_if_fail (identifier != NULL, 0);
 
-       priv = GET_PRIVATE (resource);
-
-       return strcmp (priv->identifier, identifier);
+       return strcmp (tracker_resource_get_identifier (resource), identifier);
 }
 
 /**
@@ -938,15 +904,11 @@ gint
 tracker_resource_compare (TrackerResource *a,
                           TrackerResource *b)
 {
-       TrackerResourcePrivate *a_priv, *b_priv;
-
        g_return_val_if_fail (TRACKER_IS_RESOURCE (a), 0);
        g_return_val_if_fail (TRACKER_IS_RESOURCE (b), 0);
 
-       a_priv = GET_PRIVATE (a);
-       b_priv = GET_PRIVATE (b);
-
-       return strcmp (a_priv->identifier, b_priv->identifier);
+       return strcmp (tracker_resource_get_identifier (a),
+                      tracker_resource_get_identifier (b));
 }
 
 /**
@@ -1324,7 +1286,8 @@ generate_sparql_delete_queries (TrackerResource     *resource,
                        }
 
                        g_string_append (data->string, "  ");
-                       generate_turtle_uri_value (priv->identifier, data->string, data->namespaces, NULL);
+                       generate_turtle_uri_value (tracker_resource_get_identifier (resource),
+                                                  data->string, data->namespaces, NULL);
                        g_string_append_printf (data->string, " %s ?%s }", property, variable_name);
                        g_free (variable_name);
 
@@ -1349,7 +1312,7 @@ generate_sparql_deletes (TrackerResource    *resource,
 
        data->done_list = g_list_prepend (data->done_list, resource);
 
-       if (! is_blank_node (priv->identifier) && g_hash_table_size (priv->overwrite) > 0) {
+       if (!tracker_resource_is_blank_node (resource) && g_hash_table_size (priv->overwrite) > 0) {
                generate_sparql_delete_queries (resource, priv->overwrite, data);
        }
 
@@ -1377,7 +1340,8 @@ generate_sparql_insert_pattern (TrackerResource    *resource,
        /* First, emit any sub-resources. */
        g_hash_table_foreach (priv->properties, generate_sparql_relation_inserts_foreach, data);
 
-       generate_turtle_uri_value (priv->identifier, data->string, data->namespaces, NULL);
+       generate_turtle_uri_value (tracker_resource_get_identifier (resource),
+                                  data->string, data->namespaces, NULL);
        g_string_append_printf (data->string, " ");
 
        /* rdf:type needs to be first, otherwise you'll see 'subject x is not in domain y'
@@ -1506,7 +1470,7 @@ tracker_resource_generate_jsonld (TrackerResource    *self,
         * (where the caller passed NULL as an identifier) than to emit something
         * SPARQL-specific like '_:123'.
         */
-       if (strncmp (priv->identifier, "_:", 2) != 0) {
+       if (!tracker_resource_is_blank_node (self)) {
                json_builder_set_member_name (builder, "@id");
                json_builder_add_string_value (builder, priv->identifier);
        }
@@ -1794,8 +1758,7 @@ tracker_resource_serialize (TrackerResource *resource)
 
        g_variant_builder_init (&builder, G_VARIANT_TYPE_ARRAY);
 
-       if (priv->identifier &&
-           strncmp (priv->identifier, "_:", 2) != 0) {
+       if (!tracker_resource_is_blank_node (resource)) {
                g_variant_builder_add (&builder, "{sv}", "@id",
                                       g_variant_new_string (priv->identifier));
        }
@@ -2034,3 +1997,22 @@ tracker_resource_iterator_next (TrackerResourceIterator  *iter,
        *value = val;
        return TRUE;
 }
+
+const gchar *
+tracker_resource_get_identifier_internal (TrackerResource *resource)
+{
+       TrackerResourcePrivate *priv = GET_PRIVATE (resource);
+
+       return priv->identifier;
+}
+
+gboolean
+tracker_resource_is_blank_node (TrackerResource *resource)
+{
+       TrackerResourcePrivate *priv = GET_PRIVATE (resource);
+
+       if (!priv->identifier)
+               return TRUE;
+
+       return strncmp (priv->identifier, "_:", 2) == 0;
+}