TrackerMinerManager: Tracker Control Library Reference Manual

TrackerMinerManager

TrackerMinerManager — External control and monitoring of miners

Functions

GQuark	tracker_miner_manager_error_quark ()
TrackerMinerManager *	tracker_miner_manager_new ()
TrackerMinerManager *	tracker_miner_manager_new_full ()
GSList *	tracker_miner_manager_get_running ()
GSList *	tracker_miner_manager_get_available ()
gboolean	tracker_miner_manager_pause ()
gboolean	tracker_miner_manager_pause_for_process ()
gboolean	tracker_miner_manager_resume ()
gboolean	tracker_miner_manager_is_active ()
gboolean	tracker_miner_manager_is_paused ()
gboolean	tracker_miner_manager_get_status ()
const gchar *	tracker_miner_manager_get_display_name ()
const gchar *	tracker_miner_manager_get_description ()
gboolean	tracker_miner_manager_reindex_by_mimetype ()
gboolean	tracker_miner_manager_index_file ()
void	tracker_miner_manager_index_file_async ()
gboolean	tracker_miner_manager_index_file_finish ()
gboolean	tracker_miner_manager_ignore_next_update ()

Properties

gboolean

auto-start

Read / Write / Construct Only

Signals

void	miner-activated	Run Last
void	miner-deactivated	Run Last
void	miner-paused	Run Last
void	miner-progress	Run Last
void	miner-resumed	Run Last

Types and Values

#define	TRACKER_MINER_MANAGER_ERROR
enum	TrackerMinerManagerError
struct	TrackerMinerManager
	TrackerMinerManagerClass

Object Hierarchy

    GObject
    ╰── TrackerMinerManager

Implemented Interfaces

TrackerMinerManager implements GInitable.

Includes

#include <libtracker-control/tracker-control.h>

Description

TrackerMinerManager keeps track of available miners, their current progress/status, and also allows basic external control on them, such as pausing or resuming data processing.

Functions

tracker_miner_manager_error_quark ()

GQuark
tracker_miner_manager_error_quark (void);

Returns

the GQuark used to identify miner manager errors in GError structures.

Since: 0.8

tracker_miner_manager_new ()

TrackerMinerManager *
tracker_miner_manager_new (void);

Creates a new TrackerMinerManager instance.

Note: Auto-starting miners when querying status will be enabled.

Returns

a TrackerMinerManager or NULL if an error happened.

Since: 0.8

tracker_miner_manager_new_full ()

TrackerMinerManager *
tracker_miner_manager_new_full (gboolean auto_start,
                                GError **error);

Creates a new TrackerMinerManager.

Parameters

auto_start	Flag to disable auto-starting the miners when querying status
error	a GError to report errors.

Returns

a TrackerMinerManager. On error, NULL is returned and error is set accordingly.

Since: 0.10.5

tracker_miner_manager_get_running ()

GSList *
tracker_miner_manager_get_running (TrackerMinerManager *manager);

Returns a list of references for all active miners. Active miners are miners which are running within a process.

Parameters

manager

a trackerMinerManager

Returns

a GSList which must be freed with g_slist_free() and all contained data with g_free(). Otherwise NULL is returned if there are no miners.

[transfer full][element-type utf8][nullable]

Since: 0.8

tracker_miner_manager_get_available ()

GSList *
tracker_miner_manager_get_available (TrackerMinerManager *manager);

Returns a list of references for all available miners. Available miners are miners which may or may not be running in a process at the current time.

Parameters

manager

a TrackerMinerManager

Returns

a GSList which must be freed with g_slist_free() and all contained data with g_free(). Otherwise NULL is returned if there are no miners.

[transfer full][element-type utf8][nullable]

Since: 0.8

tracker_miner_manager_pause ()

gboolean
tracker_miner_manager_pause (TrackerMinerManager *manager,
                             const gchar *miner,
                             const gchar *reason,
                             guint32 *cookie);

Asks miner to pause. a miner could be paused by several reasons, and its activity won't be resumed until all pause requests have been resumed.

Parameters

manager	a TrackerMinerManager.
miner	miner reference
reason	reason to pause
cookie	return location for the pause cookie ID.	[out][allow-none]

Returns

TRUE if the miner was paused successfully, otherwise FALSE.

Since: 0.8

tracker_miner_manager_pause_for_process ()

gboolean
tracker_miner_manager_pause_for_process
                               (TrackerMinerManager *manager,
                                const gchar *miner,
                                const gchar *reason,
                                guint32 *cookie);

This function operates exactly the same way as tracker_miner_manager_pause() with the exception that if the calling process dies, the pause is resumed. This API is useful for cases where the calling process has a risk of crashing without resuming the pause.

NOTE: If you call g_object_unref() on the manager before you intend to resume the pause and it finalizes, it will automatically resume.

Parameters

manager	a TrackerMinerManager.
miner	miner reference
reason	reason to pause
cookie	return location for the pause cookie ID.	[out][allow-none]

Returns

TRUE if the miner was paused successfully, otherwise FALSE.

Since: 0.10.15

tracker_miner_manager_resume ()

gboolean
tracker_miner_manager_resume (TrackerMinerManager *manager,
                              const gchar *miner,
                              guint32 cookie);

Tells miner to resume activity. The miner won't actually resume operations until all pause requests have been resumed.

Parameters

manager	a TrackerMinerManager
miner	miner reference
cookie	pause cookie

Returns

TRUE if the miner was successfully resumed, otherwise FALSE.

Since: 0.8

tracker_miner_manager_is_active ()

gboolean
tracker_miner_manager_is_active (TrackerMinerManager *manager,
                                 const gchar *miner);

Returns the miner's current activity.

Parameters

manager	a TrackerMinerManager
miner	miner reference

Returns

TRUE if the miner is active, otherwise FALSE.

Since: 0.8

tracker_miner_manager_is_paused ()

gboolean
tracker_miner_manager_is_paused (TrackerMinerManager *manager,
                                 const gchar *miner,
                                 GStrv *applications,
                                 GStrv *reasons);

This function either returns FALSE if the miner is not paused, or returns TRUE and fills in applications and reasons with the pause reasons and the applications that asked for it. Both arrays will have the same lengh, and will be sorted so the application/pause reason pairs have the same index.

Parameters

manager	a TrackerMinerManager
miner	miner reference
applications	return location for application names.	[out callee-allocates][allow-none][transfer full]
reasons	return location for pause reasons.	[out callee-allocates][allow-none][transfer full]

Returns

TRUE if miner is paused, otherwise FALSE.

Since: 0.8

tracker_miner_manager_get_status ()

gboolean
tracker_miner_manager_get_status (TrackerMinerManager *manager,
                                  const gchar *miner,
                                  gchar **status,
                                  gdouble *progress,
                                  gint *remaining_time);

Returns the current status, progress and remaining time for miner . remaining_time will be 0 if not possible to compute it yet, and less than zero if it is not applicable.

Parameters

manager	a TrackerMinerManager
miner	miner reference
status	return location for status.	[out][allow-none]
progress	return location for progress.	[out][allow-none]
remaining_time	return location for remaining time.	[out][allow-none]

Returns

TRUE if the status could be retrieved successfully, otherwise FALSE

Since: 0.12

tracker_miner_manager_get_display_name ()

const gchar *
tracker_miner_manager_get_display_name
                               (TrackerMinerManager *manager,
                                const gchar *miner);

Returns a translated display name for miner .

Parameters

manager	a TrackerMinerManager
miner	miner reference

Returns

A string which should not be freed or NULL.

[transfer none]

Since: 0.8

tracker_miner_manager_get_description ()

const gchar *
tracker_miner_manager_get_description (TrackerMinerManager *manager,
                                       const gchar *miner);

Returns the description for the given miner .

Parameters

manager	a TrackerMinerManager
miner	miner reference

Returns

A string which should not be freed or NULL if none is specified.

[transfer none]

Since: 0.8

tracker_miner_manager_reindex_by_mimetype ()

gboolean
tracker_miner_manager_reindex_by_mimetype
                               (TrackerMinerManager *manager,
                                const GStrv mimetypes,
                                GError **error);

Tells the filesystem miner to reindex any file with a mimetype in the mimetypes list.

On failure error will be set.

Parameters

manager	a TrackerMinerManager
mimetypes	an array of mimetypes (E.G. "text/plain"). All items with a mimetype in that list will be reindexed.	[in]
error	return location for errors.	[out callee-allocates][transfer full][allow-none]

Returns

TRUE on success, otherwise FALSE.

Since: 0.10

tracker_miner_manager_index_file ()

gboolean
tracker_miner_manager_index_file (TrackerMinerManager *manager,
                                  GFile *file,
                                  GError **error);

Tells the filesystem miner to start indexing the file .

On failure error will be set.

Parameters

manager	a TrackerMinerManager
file	a URL valid in GIO of a file to give to the miner for processing
error	return location for errors.	[out callee-allocates][transfer full][allow-none]

Returns

TRUE on success, otherwise FALSE.

Since: 0.10

tracker_miner_manager_index_file_async ()

void
tracker_miner_manager_index_file_async
                               (TrackerMinerManager *manager,
                                GFile *file,
                                GCancellable *cancellable,
                                GAsyncReadyCallback callback,
                                gpointer user_data);

Tells the filesystem miner to start indexing the file . Once the message has been sent, callback will be called. You can then call tracker_miner_manager_index_file_finish() to get the result.

Parameters

manager	a TrackerMinerManager
file	a URL valid in GIO of a file to give to the miner for processing
cancellable	a GCancellable, or `NULL`.	[allow-none]
callback	a GAsyncReadyCallback to call when the request is satisfied.	[scope async]
user_data	the data to pass to the callback function

Since: 0.16

tracker_miner_manager_index_file_finish ()

gboolean
tracker_miner_manager_index_file_finish
                               (TrackerMinerManager *manager,
                                GAsyncResult *result,
                                GError **error);

Finishes a request to index a file. See tracker_miner_manager_index_file_async()

On failure error will be set.

Parameters

manager	a TrackerMinerManager
result	a GAsyncResult
error	return location for errors.	[out callee-allocates][transfer full][allow-none]

Returns

TRUE on success, otherwise FALSE.

Since: 0.16

tracker_miner_manager_ignore_next_update ()

gboolean
tracker_miner_manager_ignore_next_update
                               (TrackerMinerManager *manager,
                                const gchar *miner,
                                const gchar **urls);

tracker_miner_manager_ignore_next_update has been deprecated since version 0.12 and should not be used in newly-written code.

Tells the miner to ignore any events for the next urls . This is used for cases where a file is updated by Tracker by the tracker-writeback service. This API is used to avoid signalling up the stack the changes to urls .

Parameters

manager	a TrackerMinerManager
miner	miner reference
urls	the subjects to ignore the next updates of.	[in]

Returns

TRUE on success, otherwise FALSE.

Since: 0.8

Types and Values

TRACKER_MINER_MANAGER_ERROR

#define TRACKER_MINER_MANAGER_ERROR tracker_miner_manager_error_quark ()

enum TrackerMinerManagerError

Enumeration values used in errors returned by the TrackerMinerManager API.

Members

TRACKER_MINER_MANAGER_ERROR_NOT_AVAILABLE	The miner in question is not active and can so can not be used.
TRACKER_MINER_MANAGER_ERROR_NOENT	The resource that the miner is handling (for example a file or URI) does not exist.

Since: 0.8

struct TrackerMinerManager

struct TrackerMinerManager;

Object to query and control miners.

TrackerMinerManagerClass

typedef struct {
	GObjectClass parent_class;

	void (* miner_progress)    (TrackerMinerManager *manager,
	                            const gchar         *miner_name,
	                            const gchar         *status,
	                            gdouble              progress);
	void (* miner_paused)      (TrackerMinerManager *manager,
	                            const gchar         *miner_name);
	void (* miner_resumed)     (TrackerMinerManager *manager,
	                            const gchar         *miner_name);
	void (* miner_activated)   (TrackerMinerManager *manager,
	                            const gchar         *miner_name);
	void (* miner_deactivated) (TrackerMinerManager *manager,
	                            const gchar         *miner_name);
} TrackerMinerManagerClass;

Members

GObjectClass `parent_class`;
`miner_progress` ()	The progress signal for all miners including name, status and progress as a percentage between 0 and 1.
`miner_paused` ()	The paused signal for all miners known about.
`miner_resumed` ()	The resumed signal for all miners known about.
`miner_activated` ()	The activated signal for all miners which indicates the miner is available on d-bus.
`miner_deactivated` ()	The deactivate for all miners which indicates the miner is no longer available on d-bus.

Property Details

The `“auto-start”` property

  “auto-start”               gboolean

If set, auto starts miners when querying their status.

Flags: Read / Write / Construct Only

Default value: TRUE

Signal Details

The `“miner-activated”` signal

void
user_function (TrackerMinerManager *manager,
               gchar               *miner,
               gpointer             user_data)

The ::miner-activated signal will be emitted whenever a miner (referenced by miner ) is activated (technically, this means the miner has appeared in the session bus).

Parameters

manager	the TrackerMinerManager
miner	miner reference
user_data	user data set when the signal handler was connected.

Flags: Run Last

Since: 0.8

The `“miner-deactivated”` signal

void
user_function (TrackerMinerManager *manager,
               gchar               *miner,
               gpointer             user_data)

The ::miner-deactivated signal will be emitted whenever a miner (referenced by miner ) is deactivated (technically, this means the miner has disappeared from the session bus).

Parameters

manager	the TrackerMinerManager
miner	miner reference
user_data	user data set when the signal handler was connected.

Flags: Run Last

Since: 0.8

The `“miner-paused”` signal

void
user_function (TrackerMinerManager *manager,
               gchar               *miner,
               gpointer             user_data)

The ::miner-paused signal will be emitted whenever a miner (referenced by miner ) is paused.

Parameters

manager	the TrackerMinerManager
miner	miner reference
user_data	user data set when the signal handler was connected.

Flags: Run Last

Since: 0.8

The `“miner-progress”` signal

void
user_function (TrackerMinerManager *manager,
               gchar               *miner,
               gchar               *status,
               gdouble              progress,
               gint                 remaining_time,
               gpointer             user_data)

The ::miner-progress signal is meant to report status/progress changes in any tracked miner.

Parameters

manager	the TrackerMinerManager
miner	miner reference
status	miner status
progress	miner progress, from 0 to 1
remaining_time	remaining processing time
user_data	user data set when the signal handler was connected.

Flags: Run Last

Since: 0.12

The `“miner-resumed”` signal

void
user_function (TrackerMinerManager *manager,
               gchar               *miner,
               gpointer             user_data)

The ::miner-resumed signal will be emitted whenever a miner (referenced by miner ) is resumed.

Parameters

manager	the TrackerMinerManager
miner	miner reference
user_data	user data set when the signal handler was connected.

Flags: Run Last

Since: 0.8