Python SessionBus.request_name方法代码示例

# 需要导入模块: from dbus import SessionBus [as 别名]
# 或者: from dbus.SessionBus import request_name [as 别名]
class VoltiSession:
    def __init__(self, app_name):
        log.Notice("running init")
        self.app_name = app_name
        self.bus = SessionBus(mainloop = DBusGMainLoop() )

    def check(self):
        log.Notice("running check")
        return self.bus.request_name(self.app_name) != bus.REQUEST_NAME_REPLY_PRIMARY_OWNER

# 需要导入模块: from dbus import SessionBus [as 别名]
# 或者: from dbus.SessionBus import request_name [as 别名]
    def __new__(cls, name, bus=None, allow_replacement=False , replace_existing=False, do_not_queue=False):
        """Constructor, which may either return an existing cached object
        or a new object.

        :Parameters:
            `name` : str
                The well-known name to be advertised
            `bus` : dbus.Bus
                A Bus on which this service will be advertised.

                Omitting this parameter or setting it to None has been
                deprecated since version 0.82.1. For backwards compatibility,
                if this is done, the global shared connection to the session
                bus will be used.

            `allow_replacement` : bool
                If True, other processes trying to claim the same well-known
                name will take precedence over this one.
            `replace_existing` : bool
                If True, this process can take over the well-known name
                from other processes already holding it.
            `do_not_queue` : bool
                If True, this service will not be placed in the queue of
                services waiting for the requested name if another service
                already holds it.
        """
        validate_bus_name(name, allow_well_known=True, allow_unique=False)

        # if necessary, get default bus (deprecated)
        if bus is None:
            import warnings
            warnings.warn('Omitting the "bus" parameter to '
                          'dbus.service.BusName.__init__ is deprecated',
                          DeprecationWarning, stacklevel=2)
            bus = SessionBus()

        # see if this name is already defined, return it if so
        # FIXME: accessing internals of Bus
        if name in bus._bus_names:
            return bus._bus_names[name]

        # otherwise register the name
        name_flags = (
            (allow_replacement and _dbus_bindings.NAME_FLAG_ALLOW_REPLACEMENT or 0) |
            (replace_existing and _dbus_bindings.NAME_FLAG_REPLACE_EXISTING or 0) |
            (do_not_queue and _dbus_bindings.NAME_FLAG_DO_NOT_QUEUE or 0))

        retval = bus.request_name(name, name_flags)

        # TODO: more intelligent tracking of bus name states?
        if retval == _dbus_bindings.REQUEST_NAME_REPLY_PRIMARY_OWNER:
            pass
        elif retval == _dbus_bindings.REQUEST_NAME_REPLY_IN_QUEUE:
            # queueing can happen by default, maybe we should
            # track this better or let the user know if they're
            # queued or not?
            pass
        elif retval == _dbus_bindings.REQUEST_NAME_REPLY_EXISTS:
            raise NameExistsException(name)
        elif retval == _dbus_bindings.REQUEST_NAME_REPLY_ALREADY_OWNER:
            # if this is a shared bus which is being used by someone
            # else in this process, this can happen legitimately
            pass
        else:
            raise RuntimeError('requesting bus name %s returned unexpected value %s' % (name, retval))

        # and create the object
        bus_name = object.__new__(cls)
        bus_name._bus = bus
        bus_name._name = name

        # cache instance (weak ref only)
        # FIXME: accessing Bus internals again
        bus._bus_names[name] = bus_name

        return bus_name