[tracker/dbus-fd-experiment: 1/15] Add Tracker Steroids interface
- From: Adrien Bustany <abustany src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [tracker/dbus-fd-experiment: 1/15] Add Tracker Steroids interface
- Date: Thu, 3 Jun 2010 17:02:14 +0000 (UTC)
commit ae9ba0d7f7884d5e906667aa807c9d629457daf6
Author: Adrien Bustany <abustany gnome org>
Date: Thu May 20 17:55:31 2010 -0400
Add Tracker Steroids interface
The Steroids interface uses a local pipe to transfer query results,
instead of sending them over DBus. To do so, it uses a new feature in
DBus 1.3 which allows passing UNIX file descriptors in messages.
This commit introduces a new DBus object exported on the store at path
/org/freedesktop/Tracker1/Steroids. Methods are in the interface
org.freedesktop.Tracker1.Steroids.
The DBus interface is composed of two methods:
PrepareQuery <- SPARQL query
-> UNIX file descriptors where results will be written
-> Query identifier
The PrepareQuery call initiates a query in Tracker. The query is not
really prepared, in the sense that a PrepareQuery with an erroneous
query will succeed. It's the Fetch call which will fail in that case.
The returned query identifier can be used to initiate the Fetch.
Fetch <- Query identifier
The Fetch call executes the query with the given identifier, and returns
the results over the pipe returned by PrepareQuery.
Note that while results are being fetched, a DB cursor is left open,
blocking other concurrent INSERTs. It is therefore important to fetch
the results and free the iterator as fast as possible.
configure.ac | 30 +++
data/dbus/tracker-steroids.xml | 17 ++
src/tracker-store/Makefile.am | 9 +-
src/tracker-store/tracker-dbus.c | 21 ++
src/tracker-store/tracker-steroids.c | 461 ++++++++++++++++++++++++++++++++++
src/tracker-store/tracker-steroids.h | 69 +++++
6 files changed, 606 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index b56c635..0fa13a9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1690,6 +1690,35 @@ fi
AM_CONDITIONAL(HAVE_TOTEM_PL_PARSER, test "x$have_playlist" = "xyes")
+####################################################################
+# Check for DBus > 1.3 for Steroids (query over pipe) support
+####################################################################
+
+AC_ARG_ENABLE(dbus-fd-passing,
+ AS_HELP_STRING([--enable-dbus-fd-passing],
+ [enable DBus FD passing for faster IPC [[default=yes]]]),,
+ [enable_dbus_fd_passing=yes])
+
+if test "x$enable_dbus_fd_passing" != "xno" ; then
+ PKG_CHECK_EXISTS([dbus-1 >= 1.3],
+ [have_dbus_fd_passing=yes],
+ [have_dbus_fd_passing=no])
+
+ if test "x$have_dbus_fd_passing" = "xyes"; then
+ AC_DEFINE(HAVE_DBUS_FD_PASSING, [], [Define if we have DBus >= 1.3 and want DBus FD passing])
+ fi
+else
+ have_dbus_fd_passing="no (disabled)"
+fi
+
+if test "x$enable_dbus_fd_passing" = "xyes"; then
+ if test "x$have_dbus_fd_passing" != "xyes"; then
+ AC_MSG_ERROR([Couldn't find a recent enough DBus for FD passing.])
+ fi
+fi
+
+AM_CONDITIONAL(HAVE_DBUS_FD_PASSING, test "x$have_dbus_fd_passing" = "xyes")
+
##################################################################
# Enable mockup extractor module?
##################################################################
@@ -1969,6 +1998,7 @@ Build Configuration:
Support for Cyrillic languages (enca): $have_enca
Support for network status detection: $have_network_manager
Unicode support library: $with_unicode_support
+ Support for DBus FD passing: $have_dbus_fd_passing
Applications:
diff --git a/data/dbus/tracker-steroids.xml b/data/dbus/tracker-steroids.xml
new file mode 100644
index 0000000..e7af30b
--- /dev/null
+++ b/data/dbus/tracker-steroids.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<node name="/org/freedesktop/Tracker1">
+ <interface name="org.freedesktop.Tracker1.Steroids">
+ <!-- SPARQL Query without updates -->
+ <method name="PrepareQuery">
+ <annotation name="org.freedesktop.DBus.GLib.Async" value="true"/>
+ <arg type="s" name="query" direction="in" />
+ <arg type="h" name="pipe" direction="out" />
+ <arg type="u" name="query_id" direction="out" />
+ </method>
+ <method name="Fetch">
+ <annotation name="org.freedesktop.DBus.GLib.Async" value="true"/>
+ <arg type="u" name="query_id" direction="in" />
+ </method>
+ </interface>
+</node>
diff --git a/src/tracker-store/Makefile.am b/src/tracker-store/Makefile.am
index edf3ed8..305f2d7 100644
--- a/src/tracker-store/Makefile.am
+++ b/src/tracker-store/Makefile.am
@@ -54,6 +54,12 @@ tracker_store_SOURCES = \
tracker-status.c \
tracker-status.h
+if HAVE_DBUS_FD_PASSING
+tracker_store_SOURCES += \
+ tracker-steroids.c \
+ tracker-steroids.h
+endif
+
if OS_WIN32
tracker_store_win_libs = -lws2_32 -lkernel32
endif
@@ -84,7 +90,8 @@ dbus_sources = \
tracker-resources-glue.h \
tracker-statistics-glue.h \
tracker-resources-class-glue.h \
- tracker-status-glue.h
+ tracker-status-glue.h \
+ tracker-steroids-glue.h
tracker-marshal.h: tracker-marshal.list
$(AM_V_GEN)$(GLIB_GENMARSHAL) $< --prefix=tracker_marshal --header > $@
diff --git a/src/tracker-store/tracker-dbus.c b/src/tracker-store/tracker-dbus.c
index 440c48e..87df0e5 100644
--- a/src/tracker-store/tracker-dbus.c
+++ b/src/tracker-store/tracker-dbus.c
@@ -43,6 +43,11 @@
#include "tracker-backup-glue.h"
#include "tracker-marshal.h"
+#ifdef HAVE_DBUS_FD_PASSING
+#include "tracker-steroids.h"
+#include "tracker-steroids-glue.h"
+#endif
+
static DBusGConnection *connection;
static DBusGProxy *gproxy;
static GSList *objects;
@@ -289,6 +294,22 @@ tracker_dbus_register_objects (void)
TRACKER_RESOURCES_PATH);
objects = g_slist_prepend (objects, object);
+#ifdef HAVE_DBUS_FD_PASSING
+ /* Add org.freedesktop.Tracker1.Steroids */
+ object = tracker_steroids_new ();
+ if (!object) {
+ g_critical ("Could net create TrackerSteroids object to register");
+ return FALSE;
+ }
+
+ dbus_register_object (connection,
+ gproxy,
+ G_OBJECT (object),
+ &dbus_glib_tracker_steroids_object_info,
+ TRACKER_STEROIDS_PATH);
+ objects = g_slist_prepend (objects, object);
+#endif
+
/* Reverse list since we added objects at the top each time */
objects = g_slist_reverse (objects);
diff --git a/src/tracker-store/tracker-steroids.c b/src/tracker-store/tracker-steroids.c
new file mode 100644
index 0000000..8e9c322
--- /dev/null
+++ b/src/tracker-store/tracker-steroids.c
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2010, Adrien Bustany <abustany gnome org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY 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 library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "tracker-dbus.h"
+#include "tracker-steroids.h"
+#include "tracker-store.h"
+
+/**
+ * /!\ IMPORTANT WARNING /!\
+ *
+ * DBus 1.3 is required for this feature to work, since UNIX FD passing is not
+ * present in earlier versions. However, using UNIX FD passing with DBus will
+ * make Valgrind stop, since the fcntl command F_DUPFD_CLOEXEC is not supported
+ * as of version 3.5.
+ * This has been reported here: https://bugs.kde.org/show_bug.cgi?id=238696
+ */
+
+G_DEFINE_TYPE (TrackerSteroids, tracker_steroids, G_TYPE_OBJECT)
+
+#define TRACKER_STEROIDS_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), TRACKER_TYPE_STEROIDS, TrackerSteroidsPrivate))
+
+typedef struct {
+ GHashTable *clients;
+} TrackerSteroidsPrivate;
+
+typedef struct {
+ TrackerSteroids *parent;
+ char *query;
+ int fd;
+ unsigned int send_buffer_index;
+ char send_buffer[TRACKER_STEROIDS_BUFFER_SIZE];
+ guint request_id;
+ DBusGMethodInvocation *context;
+} ClientInfo;
+
+typedef struct {
+ GError *error;
+ gpointer user_data;
+} InThreadPtr;
+
+static void tracker_steroids_finalize (GObject *object);
+
+static void
+tracker_steroids_class_init (TrackerSteroidsClass *klass)
+{
+ GObjectClass *object_class;
+
+ object_class = G_OBJECT_CLASS (klass);
+
+ object_class->finalize = tracker_steroids_finalize;
+
+ g_type_class_add_private (object_class, sizeof (TrackerSteroidsPrivate));
+}
+
+static void
+tracker_steroids_init (TrackerSteroids *object)
+{
+ TrackerSteroidsPrivate *priv = TRACKER_STEROIDS_GET_PRIVATE (object);
+
+ priv->clients = g_hash_table_new (g_direct_hash, g_direct_equal);
+}
+
+TrackerSteroids*
+tracker_steroids_new (void)
+{
+ return g_object_new (TRACKER_TYPE_STEROIDS, NULL);
+}
+
+static void
+destroy_client_info (gpointer user_data)
+{
+ ClientInfo *info = user_data;
+
+ if (info->query) {
+ g_free (info->query);
+ }
+
+ if (info->fd) {
+ close (info->fd);
+ }
+
+ g_slice_free (ClientInfo, user_data);
+}
+
+static void
+buffer_write_int (char *dst, int value)
+{
+ memset (dst++, (value ) & 0xff, sizeof (char));
+ memset (dst++, (value >> 8) & 0xff, sizeof (char));
+ memset (dst++, (value >> 16) & 0xff, sizeof (char));
+ memset (dst++, (value >> 24) & 0xff, sizeof (char));
+}
+
+static void
+client_write_int (ClientInfo *info, int value)
+{
+ char *dst = info->send_buffer + info->send_buffer_index;
+ buffer_write_int (dst, value);
+ info->send_buffer_index += sizeof (int);
+}
+
+static void
+buffer_send (int fd, char *buf, int size)
+{
+ ssize_t sent = 0;
+
+ while (sent != size) {
+ ssize_t ret = write (fd,
+ buf + sent,
+ size - sent);
+
+ if (ret == -1) {
+ g_critical ("Could not send buffer");
+ }
+
+ sent += ret;
+ }
+}
+
+static void
+page_flush (ClientInfo *info)
+{
+ /* Put an "end of page" marker if there was still some space left
+ * The "end of page" marker is one byte long, so we're sure there's at
+ * least space for the marker */
+ if (TRACKER_STEROIDS_BUFFER_SIZE != info->send_buffer_index) {
+ memset (info->send_buffer + info->send_buffer_index,
+ TRACKER_STEROIDS_EOP,
+ sizeof (char));
+ }
+
+ buffer_send (info->fd, info->send_buffer, TRACKER_STEROIDS_BUFFER_SIZE);
+
+ info->send_buffer_index = 0;
+}
+
+static void
+query_callback (gpointer inthread_data,
+ GError *error,
+ gpointer user_data)
+{
+ InThreadPtr *ptr = inthread_data;
+ ClientInfo *info = user_data;
+ TrackerSteroidsPrivate *priv = TRACKER_STEROIDS_GET_PRIVATE (info->parent);
+ DBusMessage *reply;
+
+ if (info->fd) {
+ close (info->fd);
+ }
+
+ if (ptr && ptr->error) {
+ /* Client is still there, but query failed */
+ tracker_dbus_request_failed (info->request_id,
+ info->context,
+ &ptr->error,
+ NULL);
+ dbus_g_method_return_error (info->context, ptr->error);
+ g_error_free (ptr->error);
+ } else if (error) {
+ /* Client has disappeared */
+ tracker_dbus_request_failed (info->request_id,
+ info->context,
+ &error,
+ NULL);
+ dbus_g_method_return_error (info->context, error);
+ } else {
+ tracker_dbus_request_success (info->request_id,
+ info->context);
+ reply = dbus_g_method_get_reply (info->context);
+ dbus_g_method_send_reply (info->context, reply);
+ }
+
+ if (ptr) {
+ g_slice_free (InThreadPtr, ptr);
+ }
+
+ g_hash_table_remove (priv->clients, info);
+}
+
+static gpointer
+query_inthread (TrackerDBCursor *cursor,
+ GError *error,
+ gpointer user_data)
+{
+ InThreadPtr *ptr = g_slice_new0 (InThreadPtr);
+ ClientInfo *info = user_data;
+ GError *loop_error = NULL;
+ guint n_columns;
+ int *column_sizes;
+ int *column_offsets;
+ const gchar **column_data;
+
+ if (error) {
+ client_write_int (info, TRACKER_STEROIDS_RC_ERROR);
+ page_flush (info);
+ ptr->error = g_error_copy (error);
+ return ptr;
+ }
+
+ n_columns = tracker_db_cursor_get_n_columns (cursor);
+
+ column_sizes = g_malloc (n_columns * sizeof (int));
+ column_offsets = g_malloc (n_columns * sizeof (int));
+ column_data = g_malloc (n_columns * sizeof (char*));
+
+ while (tracker_db_cursor_iter_next (cursor, &loop_error)) {
+ int i;
+ guint last_offset = -1;
+ guint row_size;
+
+ if (loop_error != NULL) {
+ break;
+ }
+
+ for (i = 0; i < n_columns ; i++) {
+ const gchar *str;
+
+ str = tracker_db_cursor_get_string (cursor, i);
+
+ column_sizes[i] = str ? strlen (str) : 0;
+ column_data[i] = str;
+
+ last_offset += column_sizes[i] + 1;
+ column_offsets[i] = last_offset;
+ }
+
+ row_size = sizeof (int) /* return code */
+ + sizeof (int) /* column count */
+ + n_columns * sizeof (int) /* column offsets */
+ + last_offset /* columns data */
+ + n_columns * sizeof (char); /* trailing \0 for each column */
+
+ if (row_size > TRACKER_STEROIDS_BUFFER_SIZE) {
+ char *buffer = g_malloc (sizeof (char) * row_size + sizeof (int));
+ char *dst = buffer;
+
+ /* Flush the current page, if there was something in it */
+ if (info->send_buffer_index) {
+ page_flush (info);
+ }
+
+ buffer_write_int (dst, TRACKER_STEROIDS_RC_LARGEROW);
+ dst += sizeof (int);
+ buffer_write_int (dst, row_size);
+ dst += sizeof (int);
+ buffer_write_int (dst, n_columns);
+ dst += sizeof (int);
+ memcpy (dst,
+ column_offsets,
+ n_columns * sizeof (int));
+ dst += n_columns * sizeof (int);
+
+ for (i = 0; i < n_columns; i++) {
+ memcpy (dst,
+ column_data[i],
+ column_sizes[i]);
+ dst += column_sizes[i];
+ memset (dst, 0, 1);
+ dst ++;
+ }
+
+ buffer_send (info->fd, buffer, row_size + 2 * sizeof (int));
+
+ g_free (buffer);
+ continue;
+ }
+
+ if (row_size > TRACKER_STEROIDS_BUFFER_SIZE - info->send_buffer_index) {
+ page_flush (info);
+ }
+
+ client_write_int (info, TRACKER_STEROIDS_RC_ROW);
+ client_write_int (info, n_columns);
+ memcpy (info->send_buffer + info->send_buffer_index,
+ column_offsets,
+ n_columns * sizeof (int));
+ info->send_buffer_index += n_columns * sizeof (int);
+
+ for (i = 0; i < n_columns; i++) {
+ memcpy (info->send_buffer + info->send_buffer_index,
+ column_data[i],
+ column_sizes[i]);
+ info->send_buffer_index += column_sizes[i];
+ memset (info->send_buffer + info->send_buffer_index, 0, 1);
+ info->send_buffer_index ++;
+ }
+ }
+
+ /* We flush to ensure we'll have enough space to write the DONE code */
+ if (info->send_buffer_index) {
+ page_flush (info);
+ }
+ client_write_int (info, TRACKER_STEROIDS_RC_DONE);
+ page_flush (info);
+
+ close (info->fd);
+
+ if (loop_error) {
+ ptr->error = loop_error;
+ }
+
+ g_free (column_sizes);
+ g_free (column_offsets);
+ g_free (column_data);
+
+ return ptr;
+}
+
+void
+tracker_steroids_prepare_query (TrackerSteroids *steroids,
+ const char *query,
+ DBusGMethodInvocation *context,
+ GError **error)
+{
+ TrackerSteroidsPrivate *priv = TRACKER_STEROIDS_GET_PRIVATE (steroids);
+ guint request_id;
+ gchar *sender;
+ int pipefd[2];
+ DBusMessage *reply;
+ DBusMessageIter iter;
+ GError *inner_error = NULL;
+ ClientInfo *info;
+
+ request_id = tracker_dbus_get_next_request_id ();
+
+ tracker_dbus_async_return_if_fail (query != NULL, context);
+
+ tracker_dbus_request_new (request_id,
+ context,
+ "%s(): '%s'",
+ __FUNCTION__,
+ query);
+
+ if (pipe (pipefd) < 0) {
+ g_set_error (&inner_error, TRACKER_DBUS_ERROR, 0, "Cannot open pipe");
+
+ tracker_dbus_request_failed (request_id,
+ context,
+ &inner_error,
+ NULL);
+ dbus_g_method_return_error (context, inner_error);
+ g_propagate_error (error, inner_error);
+
+ return;
+ }
+
+ info = g_slice_new0 (ClientInfo);
+ info->parent = steroids;
+ info->fd = pipefd[1];
+ info->query = g_strdup (query);
+
+ sender = dbus_g_method_get_sender (context);
+
+ reply = dbus_g_method_get_reply (context);
+
+ dbus_message_iter_init_append (reply, &iter);
+
+ if (!dbus_message_iter_append_basic (&iter,
+ DBUS_TYPE_UNIX_FD,
+ &pipefd[0])) {
+ g_critical ("FD passing not supported");
+
+ g_set_error (&inner_error, TRACKER_DBUS_ERROR, 0, "FD passing not supported");
+
+ tracker_dbus_request_failed (request_id,
+ context,
+ &inner_error,
+ NULL);
+ dbus_g_method_return_error (context, inner_error);
+ g_propagate_error (error, inner_error);
+
+ g_slice_free (ClientInfo, info);
+ g_free (sender);
+ return;
+ }
+
+ dbus_message_iter_append_basic (&iter, DBUS_TYPE_UINT32, &request_id);
+
+ g_hash_table_insert (priv->clients,
+ GUINT_TO_POINTER (request_id),
+ info);
+
+ tracker_dbus_request_success (request_id, context);
+ dbus_g_method_send_reply (context, reply);
+
+ g_free (sender);
+}
+
+void
+tracker_steroids_fetch (TrackerSteroids *steroids,
+ guint query_id,
+ DBusGMethodInvocation *context,
+ GError **error)
+{
+ TrackerSteroidsPrivate *priv = TRACKER_STEROIDS_GET_PRIVATE (steroids);
+ ClientInfo *info;
+ guint request_id;
+ gchar *sender;
+ GError *inner_error = NULL;
+
+ request_id = tracker_dbus_get_next_request_id ();
+
+ tracker_dbus_request_new (request_id,
+ context,
+ "%s(): %u",
+ __FUNCTION__,
+ query_id);
+
+ info = g_hash_table_lookup (priv->clients,
+ GUINT_TO_POINTER (query_id));
+
+ if (!info) {
+ g_set_error (&inner_error, TRACKER_DBUS_ERROR, 0, "Wrong query id");
+ tracker_dbus_request_failed (request_id,
+ context,
+ &inner_error,
+ NULL);
+ dbus_g_method_return_error (info->context, inner_error);
+ g_propagate_error (error, inner_error);
+
+ return;
+ }
+
+ info->request_id = request_id;
+ info->context = context;
+
+ sender = dbus_g_method_get_sender (context);
+
+ tracker_store_sparql_query (info->query, TRACKER_STORE_PRIORITY_HIGH,
+ query_inthread, query_callback, sender,
+ info, destroy_client_info);
+
+ g_free (sender);
+}
+
+static void
+tracker_steroids_finalize (GObject *object)
+{
+ TrackerSteroidsPrivate *priv = TRACKER_STEROIDS_GET_PRIVATE (object);
+
+ g_hash_table_unref (priv->clients);
+}
diff --git a/src/tracker-store/tracker-steroids.h b/src/tracker-store/tracker-steroids.h
new file mode 100644
index 0000000..7a4e3ea
--- /dev/null
+++ b/src/tracker-store/tracker-steroids.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2010, Adrien Bustany <abustany gnome org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY 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 library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __TRACKER_STEROIDS_H__
+#define __TRACKER_STEROIDS_H__
+
+#include <glib-object.h>
+
+#define TRACKER_STEROIDS_SERVICE "org.freedesktop.Tracker1"
+#define TRACKER_STEROIDS_PATH "/org/freedesktop/Tracker1/Steroids"
+#define TRACKER_STEROIDS_INTERFACE "org.freedesktop.Tracker1.Steroids"
+
+G_BEGIN_DECLS
+
+#define TRACKER_TYPE_STEROIDS (tracker_steroids_get_type ())
+#define TRACKER_STEROIDS(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), TRACKER_TYPE_STEROIDS, TrackerSteroids))
+#define TRACKER_STEROIDS_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), TRACKER_TYPE_DBUS_STEROIDS, TrackerSteroidsClass))
+#define TRACKER_IS_STEROIDS(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), TRACKER_TYPE_STEROIDS))
+#define TRACKER_IS_STEROIDS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), TRACKER_TYPE_STEROIDS))
+#define TRACKER_STEROIDS_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), TRACKER_TYPE_STEROIDS, TrackerSteroidsClass))
+
+#define TRACKER_STEROIDS_BUFFER_SIZE 65536
+
+#define TRACKER_STEROIDS_RC_ERROR 0
+#define TRACKER_STEROIDS_RC_ROW 1
+#define TRACKER_STEROIDS_RC_DONE 2
+#define TRACKER_STEROIDS_RC_LARGEROW 3
+
+#define TRACKER_STEROIDS_EOP 0xFF
+
+typedef struct TrackerSteroids TrackerSteroids;
+typedef struct TrackerSteroidsClass TrackerSteroidsClass;
+
+struct TrackerSteroids {
+ GObject parent;
+};
+
+struct TrackerSteroidsClass {
+ GObjectClass parent;
+};
+
+GType tracker_steroids_get_type (void) G_GNUC_CONST;
+TrackerSteroids* tracker_steroids_new (void);
+void tracker_steroids_prepare_query (TrackerSteroids *steroids,
+ const gchar *query,
+ DBusGMethodInvocation *context,
+ GError **error);
+void tracker_steroids_fetch (TrackerSteroids *steroids,
+ guint query_id,
+ DBusGMethodInvocation *context,
+ GError **error);
+
+#endif /* __TRACKER_STEROIDS_H__ */
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