"""Shell side object which manages request to start activity""" # Copyright (C) 2006-2007 Red Hat, Inc. # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser 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 # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the # Free Software Foundation, Inc., 59 Temple Place - Suite 330, # Boston, MA 02111-1307, USA. import logging import dbus import gobject import gtk from sugar.presence import presenceservice from sugar.activity.activityhandle import ActivityHandle from sugar import util _SHELL_SERVICE = "org.laptop.Shell" _SHELL_PATH = "/org/laptop/Shell" _SHELL_IFACE = "org.laptop.Shell" _ACTIVITY_FACTORY_INTERFACE = "org.laptop.ActivityFactory" def create_activity_id(): """Generate a new, unique ID for this activity""" pservice = presenceservice.get_instance() # create a new unique activity ID i = 0 act_id = None while i < 10: act_id = util.unique_id() i += 1 # check through network activities found = False activities = pservice.get_activities() for act in activities: if act_id == act.props.id: found = True break if not found: return act_id raise RuntimeError("Cannot generate unique activity id.") class ActivityCreationHandler(gobject.GObject): """Sugar-side activity creation interface This object uses a dbus method on the ActivityFactory service to create the new activity. It generates GObject events in response to the success/failure of activity startup using callbacks to the service's create call. """ def __init__(self, service_name, activity_handle): """Initialise the handler service_name -- the service name of the bundle factory activity_handle -- stores the values which are to be passed to the service to uniquely identify the activity to be created and the sharing service that may or may not be connected with it sugar.activity.activityhandle.ActivityHandle instance calls the "create" method on the service for this particular activity type and registers the _reply_handler and _error_handler methods on that call's results. The specific service which creates new instances of this particular type of activity is created during the activity registration process in shell bundle registry which creates service definition files for each registered bundle type. """ gobject.GObject.__init__(self) self._service_name = service_name self._activity_handle = activity_handle bus = dbus.SessionBus() bus_object = bus.get_object(_SHELL_SERVICE, _SHELL_PATH) self._shell = dbus.Interface(bus_object, _SHELL_IFACE) object_path = '/' + service_name.replace('.', '/') proxy_obj = bus.get_object(service_name, object_path, follow_name_owner_changes=True) self._factory = dbus.Interface(proxy_obj, _ACTIVITY_FACTORY_INTERFACE) if self.get_activity_id() != None: self._shell.ActivateActivity(self.get_activity_id(), reply_handler=self._activate_reply_handler, error_handler=self._activate_error_handler) else: self._launch_activity() def _launch_activity(self): self._shell.NotifyLaunch( self._service_name, self.get_activity_id(), reply_handler=self._no_reply_handler, error_handler=self._notify_launch_error_handler) self._factory.create(self._activity_handle.get_dict(), timeout=120 * 1000, reply_handler=self._create_reply_handler, error_handler=self._create_error_handler) def get_activity_id(self): """Retrieve the unique identity for this activity""" return self._activity_handle.activity_id def _no_reply_handler(self, *args): pass def _notify_launch_failure_error_handler(self, err): logging.debug('Notify launch failure failed %s' % err) def _notify_launch_error_handler(self, err): logging.debug('Notify launch failed %s' % err) def _activate_reply_handler(self, activated): if not activated: self._launch_activity() def _activate_error_handler(self, err): logging.debug("Activity activation request failed %s" % err) def _create_reply_handler(self, xid=None): if xid is None: self._create_error_handler('D-Bus error') return logging.debug("Activity created %s (%s)." % (self._activity_handle.activity_id, self._service_name)) def _create_error_handler(self, err): logging.debug("Couldn't create activity %s (%s): %s" % (self._activity_handle.activity_id, self._service_name, err)) self._shell.NotifyLaunchFailure( self.get_activity_id(), reply_handler=self._no_reply_handler, error_handler=self._notify_launch_failure_error_handler) def create(service_name, activity_handle=None): """Create a new activity from its name.""" if not activity_handle: activity_handle = ActivityHandle(create_activity_id()) return ActivityCreationHandler(service_name, activity_handle) def create_with_uri(service_name, uri): """Create a new activity and pass the uri as handle.""" activity_handle = ActivityHandle(create_activity_id()) activity_handle.uri = uri return ActivityCreationHandler(service_name, activity_handle) def create_with_object_id(service_name, object_id): """Create a new activity and pass the object id as handle.""" activity_handle = ActivityHandle(create_activity_id()) activity_handle.object_id = object_id return ActivityCreationHandler(service_name, activity_handle)