TpBaseConnectionManager

TpBaseConnectionManager — base class for TpSvcConnectionManager implementations

Synopsis


#include <telepathy-glib/base-connection-manager.h>


gboolean            (*TpCMParamFilter)                  (const TpCMParamSpec *paramspec,
                                                         GValue *value,
                                                         GError **error);
gboolean            tp_cm_param_filter_string_nonempty  (const TpCMParamSpec *paramspec,
                                                         GValue *value,
                                                         GError **error);
gboolean            tp_cm_param_filter_uint_nonzero     (const TpCMParamSpec *paramspec,
                                                         GValue *value,
                                                         GError **error);
                    TpCMParamSpec;
                    TpCMProtocolSpec;
                    TpBaseConnectionManager;
                    TpBaseConnectionManagerClass;
TpBaseConnection*   (*TpBaseConnectionManagerNewConnFunc)
                                                        (TpBaseConnectionManager *self,
                                                         const gchar *proto,
                                                         TpIntSet *params_present,
                                                         void *parsed_params,
                                                         GError **error);
gboolean            tp_base_connection_manager_register (TpBaseConnectionManager *self);
#define             TP_CM_BUS_NAME_BASE
#define             TP_CM_OBJECT_PATH_BASE

Object Hierarchy


  GObject
   +----TpBaseConnectionManager

Implemented Interfaces

TpBaseConnectionManager implements TpSvcConnectionManager.

Signals


  "no-more-connections"                            : Run Last / Has Details

Description

This base class makes it easier to write TpSvcConnectionManager implementations by managing the D-Bus object path and bus name, and maintaining a table of active connections. Subclasses should usually only need to override the members of the class data structure.

Details

TpCMParamFilter ()

gboolean            (*TpCMParamFilter)                  (const TpCMParamSpec *paramspec,
                                                         GValue *value,
                                                         GError **error);

Signature of a callback used to validate and/or normalize user-provided CM parameter values.

paramspec : The parameter specification. The filter is likely to use name (for the error message if the value is invalid) and filter_data.
value : The value for that parameter provided by the user. May be changed to contain a different value of the same type, if some sort of normalization is required
error : Used to raise TP_ERROR_INVALID_ARGUMENT if the given value is rejected
Returns : TRUE to accept, FALSE (with error set) to reject

tp_cm_param_filter_string_nonempty ()

gboolean            tp_cm_param_filter_string_nonempty  (const TpCMParamSpec *paramspec,
                                                         GValue *value,
                                                         GError **error);

A TpCMParamFilter which rejects empty strings.

paramspec : The parameter specification for a string parameter
value : A GValue containing a string, which will not be altered
error : Used to return an error if the string is empty
Returns : TRUE to accept, FALSE (with error set) to reject

tp_cm_param_filter_uint_nonzero ()

gboolean            tp_cm_param_filter_uint_nonzero     (const TpCMParamSpec *paramspec,
                                                         GValue *value,
                                                         GError **error);

A TpCMParamFilter which rejects zero, useful for server port numbers.

paramspec : The parameter specification for a guint parameter
value : A GValue containing a guint, which will not be altered
error : Used to return an error if the guint is 0
Returns : TRUE to accept, FALSE (with error set) to reject

TpCMParamSpec

typedef struct {
    const gchar *name;
    const gchar *dtype;
    GType gtype;
    guint flags;
    gconstpointer def;
    gsize offset;

    TpCMParamFilter filter;
    gconstpointer filter_data;
} TpCMParamSpec;

Structure representing a connection manager parameter, as accepted by RequestConnection.

In addition to the fields documented here, there are two gpointer fields which must currently be NULL. A meaning may be defined for these in a future version of telepathy-glib.

const gchar *name; Name as passed over D-Bus
const gchar *dtype; D-Bus type signature. We currently support 16- and 32-bit integers (gtype is INT), 16- and 32-bit unsigned integers (gtype is UINT), strings (gtype is STRING) and booleans (gtype is BOOLEAN).
GType gtype; GLib type, derived from dtype as above
guint flags; Some combination of TP_CONN_MGR_PARAM_FLAG_foo
gconstpointer def; Default value, as a (const gchar *) for string parameters, or using GINT_TO_POINTER or GUINT_TO_POINTER for integer parameters
gsize offset; Offset of the parameter in the opaque data structure. The member at that offset is expected to be a gint, guint, (gchar *) or gboolean, depending on gtype. Alternatively, this may be G_MAXSIZE, which means the parameter is obsolete, and is accepted but ignored.
TpCMParamFilter filter; A callback which is used to validate or normalize the user-provided value before it is written into the opaque data structure
gconstpointer filter_data; Arbitrary opaque data intended for use by the filter function

TpCMProtocolSpec

typedef struct {
    const gchar *name;
    const TpCMParamSpec *parameters;
    gpointer (*params_new) (void);
    void (*params_free) (gpointer);
} TpCMProtocolSpec;

Structure representing a connection manager protocol.

In addition to the fields documented here, there are four gpointer fields which must currently be NULL. A meaning may be defined for these in a future version of telepathy-glib.

const gchar *name; The name which should be passed to RequestConnection for this protocol.
const TpCMParamSpec *parameters; An array of TpCMParamSpec representing the valid parameters for this protocol, terminated by a TpCMParamSpec whose name entry is NULL.
params_new () A function which allocates an opaque data structure to store the parsed parameters for this protocol. The offset fields in the members of the parameters array refer to offsets within this opaque structure.
params_free () A function which deallocates the opaque data structure provided by params_new, including deallocating its data members (currently, only strings) if necessary.

TpBaseConnectionManager

typedef struct _TpBaseConnectionManager TpBaseConnectionManager;

A base class for connection managers. There are no interesting public fields in the instance structure.


TpBaseConnectionManagerClass

typedef struct {
    GObjectClass parent_class;

    const char *cm_dbus_name;
    const TpCMProtocolSpec *protocol_params;
    TpBaseConnectionManagerNewConnFunc new_connection;
} TpBaseConnectionManagerClass;

The class structure for TpBaseConnectionManager.

In addition to the fields documented here, there are four gpointer fields which must currently be NULL (a meaning may be defined for these in a future version of telepathy-glib), and a pointer to opaque private data.

GObjectClass parent_class; The parent class
const char *cm_dbus_name; The name of this connection manager, as used to construct D-Bus object paths and bus names. Must contain only letters, digits and underscores, and may not start with a digit. Must be filled in by subclasses in their class_init function.
const TpCMProtocolSpec *protocol_params; An array of TpCMProtocolSpec structures representing the protocols this connection manager supports, terminated by a structure whose name member is NULL.
TpBaseConnectionManagerNewConnFunc new_connection; A TpBaseConnectionManagerNewConnFunc used to construct new connections. Must be filled in by subclasses in their class_init function.

TpBaseConnectionManagerNewConnFunc ()

TpBaseConnection*   (*TpBaseConnectionManagerNewConnFunc)
                                                        (TpBaseConnectionManager *self,
                                                         const gchar *proto,
                                                         TpIntSet *params_present,
                                                         void *parsed_params,
                                                         GError **error);

A function that will return a new connection according to the parsed parameters; used to implement RequestConnection.

The connection manager base class will register the bus name for the new connection, and place a reference to it in its table of connections until the connection's shutdown process finishes.

self : The connection manager implementation
proto : The protocol name from the D-Bus request
params_present : A set of integers representing the indexes into the array of TpCMParamSpec of those parameters that were present in the request
parsed_params : An opaque data structure as returned by the protocol's params_new function, populated according to the parameter specifications
error : if not NULL, used to indicate the error if NULL is returned
Returns : the new connection object, or NULL on error.

tp_base_connection_manager_register ()

gboolean            tp_base_connection_manager_register (TpBaseConnectionManager *self);

Register the connection manager with an appropriate object path as determined from its cm_dbus_name, and register the appropriate well-known bus name.

self : The connection manager implementation
Returns : TRUE on success, FALSE (having emitted a warning to stderr) on failure

TP_CM_BUS_NAME_BASE

#define TP_CM_BUS_NAME_BASE    "org.freedesktop.Telepathy.ConnectionManager."

The prefix for a connection manager's bus name, to which the CM's name (e.g. "gabble") should be appended.


TP_CM_OBJECT_PATH_BASE

#define TP_CM_OBJECT_PATH_BASE "/org/freedesktop/Telepathy/ConnectionManager/"

The prefix for a connection manager's object path, to which the CM's name (e.g. "gabble") should be appended.

Signal Details

The "no-more-connections" signal

void                user_function                      (TpBaseConnectionManager *arg0,
                                                        gpointer                 user_data)      : Run Last / Has Details

Emitted when the table of active connections becomes empty. tp_run_connection_manager() uses this to detect when to shut down the connection manager.

user_data : user data set when the signal handler was connected.

See Also

TpBaseConnection, TpSvcConnectionManager, run