class _MessageIterator(collections.abc.Iterator):
- def _handle_status(self, status, gen_error_msg):
- if status == native_bt.MESSAGE_ITERATOR_STATUS_AGAIN:
- raise bt2.TryAgain
- elif status == native_bt.MESSAGE_ITERATOR_STATUS_END:
- raise bt2.Stop
- elif status < 0:
- raise bt2.Error(gen_error_msg)
-
def __next__(self):
raise NotImplementedError
self._at = 0
super().__init__(ptr)
+ def _handle_status(self, status, gen_error_msg):
+ if status == native_bt.MESSAGE_ITERATOR_STATUS_AGAIN:
+ raise bt2.TryAgain
+ elif status == native_bt.MESSAGE_ITERATOR_STATUS_END:
+ raise bt2.Stop
+ elif status < 0:
+ raise bt2.Error(gen_error_msg)
+
def __next__(self):
if len(self._current_msgs) == self._at:
status, msgs = self._get_msg_range(self._ptr)
return bt2.message._create_from_ptr(msg_ptr)
+ @property
+ def can_seek_beginning(self):
+ res = self._can_seek_beginning(self._ptr)
+ return res != 0
+
+ def seek_beginning(self):
+ # Forget about buffered messages, they won't be valid after seeking..
+ self._current_msgs.clear()
+ self._at = 0
+
+ status = self._seek_beginning(self._ptr)
+ self._handle_status(status, 'cannot seek message iterator beginning')
+
# This is created when a component wants to iterate on one of its input ports.
class _UserComponentInputPortMessageIterator(_GenericMessageIterator):
_get_msg_range = staticmethod(native_bt.py3_self_component_port_input_get_msg_range)
_get_ref = staticmethod(native_bt.self_component_port_input_message_iterator_get_ref)
_put_ref = staticmethod(native_bt.self_component_port_input_message_iterator_put_ref)
+ _can_seek_beginning = staticmethod(native_bt.self_component_port_input_message_iterator_can_seek_beginning)
+ _seek_beginning = staticmethod(native_bt.self_component_port_input_message_iterator_seek_beginning)
# This is created when the user wants to iterate on a component's output port,
_get_msg_range = staticmethod(native_bt.py3_port_output_get_msg_range)
_get_ref = staticmethod(native_bt.port_output_message_iterator_get_ref)
_put_ref = staticmethod(native_bt.port_output_message_iterator_put_ref)
+ _can_seek_beginning = staticmethod(native_bt.port_output_message_iterator_can_seek_beginning)
+ _seek_beginning = staticmethod(native_bt.port_output_message_iterator_seek_beginning)
# This is extended by the user to implement component classes in Python. It
msg._get_ref(msg._ptr)
return int(msg._ptr)
+ @property
+ def _can_seek_beginning_from_native(self):
+ # Here, we mimic the behavior of the C API:
+ #
+ # - If the iterator has a _can_seek_beginning attribute, read it and use
+ # that result.
+ # - Otherwise, the presence or absence of a `_seek_beginning`
+ # method indicates whether the iterator can seek beginning.
+ if hasattr(self, '_can_seek_beginning'):
+ can_seek_beginning = self._can_seek_beginning
+ utils._check_bool(can_seek_beginning)
+ return can_seek_beginning
+ else:
+ return hasattr(self, '_seek_beginning')
+
+ def _seek_beginning_from_native(self):
+ self._seek_beginning()
+
def _create_event_message(self, event_class, packet, default_clock_snapshot=None):
utils._check_type(event_class, bt2.event_class._EventClass)
utils._check_type(packet, bt2.packet._Packet)