X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=src%2Fbindings%2Fpython%2Fbt2%2Fbt2%2Fmessage_iterator.py;h=2fef7d68dfcb183f6cf15b5d78c5b9a9b008d686;hb=9a2c8b8e0cb6579066b4b8ceb8255cdd5175bb2d;hp=5ccec738aad7a1b4cc7c66362cf4ed4c0f59c2fd;hpb=4c4935bf825b84aeffa36234e95492fc6d2e9920;p=babeltrace.git diff --git a/src/bindings/python/bt2/bt2/message_iterator.py b/src/bindings/python/bt2/bt2/message_iterator.py index 5ccec738..2fef7d68 100644 --- a/src/bindings/python/bt2/bt2/message_iterator.py +++ b/src/bindings/python/bt2/bt2/message_iterator.py @@ -36,7 +36,10 @@ class _MessageIterator(collections.abc.Iterator): raise NotImplementedError -class _GenericMessageIterator(object._SharedObject, _MessageIterator): +class _UserComponentInputPortMessageIterator(object._SharedObject, _MessageIterator): + _get_ref = staticmethod(native_bt.message_iterator_get_ref) + _put_ref = staticmethod(native_bt.message_iterator_put_ref) + def __init__(self, ptr): self._current_msgs = [] self._at = 0 @@ -44,7 +47,9 @@ class _GenericMessageIterator(object._SharedObject, _MessageIterator): def __next__(self): if len(self._current_msgs) == self._at: - status, msgs = self._get_msg_range(self._ptr) + status, msgs = native_bt.bt2_self_component_port_input_get_msg_range( + self._ptr + ) utils._handle_func_status( status, 'unexpected error: cannot advance the message iterator' ) @@ -56,35 +61,63 @@ class _GenericMessageIterator(object._SharedObject, _MessageIterator): return bt2_message._create_from_ptr(msg_ptr) - @property def can_seek_beginning(self): - res = self._can_seek_beginning(self._ptr) + (status, res) = native_bt.message_iterator_can_seek_beginning(self._ptr) + utils._handle_func_status( + status, + 'cannot check whether or not message iterator can seek its beginning', + ) return res != 0 def seek_beginning(self): - # Forget about buffered messages, they won't be valid after seeking.. + # Forget about buffered messages, they won't be valid after seeking. self._current_msgs.clear() self._at = 0 - status = self._seek_beginning(self._ptr) + status = native_bt.message_iterator_seek_beginning(self._ptr) utils._handle_func_status(status, 'cannot seek message iterator beginning') + def can_seek_ns_from_origin(self, ns_from_origin): + utils._check_int64(ns_from_origin) + (status, res) = native_bt.message_iterator_can_seek_ns_from_origin( + self._ptr, ns_from_origin + ) + utils._handle_func_status( + status, + 'cannot check whether or not message iterator can seek given ns from origin', + ) + return res != 0 + + def seek_ns_from_origin(self, ns_from_origin): + utils._check_int64(ns_from_origin) + + # Forget about buffered messages, they won't be valid after seeking. + self._current_msgs.clear() + self._at = 0 + + status = native_bt.message_iterator_seek_ns_from_origin( + self._ptr, ns_from_origin + ) + utils._handle_func_status( + status, 'message iterator cannot seek given ns from origin' + ) + + @property + def can_seek_forward(self): + return native_bt.message_iterator_can_seek_forward(self._ptr) + + +class _MessageIteratorConfiguration: + def __init__(self, ptr): + self._ptr = ptr -# This is created when a component wants to iterate on one of its input ports. -class _UserComponentInputPortMessageIterator(_GenericMessageIterator): - _get_msg_range = staticmethod(native_bt.bt2_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 - ) + def can_seek_forward(self, value): + utils._check_bool(value) + native_bt.self_message_iterator_configuration_set_can_seek_forward( + self._ptr, value + ) + + can_seek_forward = property(fset=can_seek_forward) # This is extended by the user to implement component classes in Python. It @@ -110,19 +143,28 @@ class _UserMessageIterator(_MessageIterator): self._bt_ptr = ptr return self - def _bt_init_from_native(self, self_output_port_ptr): + def _bt_init_from_native(self, config_ptr, self_output_port_ptr): self_output_port = bt2_port._create_self_from_ptr_and_get_ref( self_output_port_ptr, native_bt.PORT_TYPE_OUTPUT ) - self.__init__(self_output_port) + config = _MessageIteratorConfiguration(config_ptr) + self.__init__(config, self_output_port) - def __init__(self, output_port): + def __init__(self, config, self_output_port): pass @property def _component(self): return native_bt.bt2_get_user_component_from_user_msg_iter(self._bt_ptr) + @property + def _port(self): + port_ptr = native_bt.self_message_iterator_borrow_port(self._bt_ptr) + assert port_ptr is not None + return bt2_port._create_self_from_ptr_and_get_ref( + port_ptr, native_bt.PORT_TYPE_OUTPUT + ) + @property def addr(self): return int(self._bt_ptr) @@ -146,7 +188,7 @@ class _UserMessageIterator(_MessageIterator): except Exception: raise - utils._check_type(msg, bt2_message._Message) + utils._check_type(msg, bt2_message._MessageConst) # The reference we return will be given to the message array. # However, the `msg` Python object may stay alive, if the user has kept @@ -154,16 +196,15 @@ class _UserMessageIterator(_MessageIterator): msg._get_ref(msg._ptr) return int(msg._ptr) - @property def _bt_can_seek_beginning_from_native(self): # Here, we mimic the behavior of the C API: # - # - If the iterator has a _user_can_seek_beginning attribute, + # - If the iterator has a _user_can_seek_beginning method, # read it and use that result. - # - Otherwise, the presence or absence of a `_seek_beginning` + # - Otherwise, the presence or absence of a `_user_seek_beginning` # method indicates whether the iterator can seek beginning. if hasattr(self, '_user_can_seek_beginning'): - can_seek_beginning = self._user_can_seek_beginning + can_seek_beginning = self._user_can_seek_beginning() utils._check_bool(can_seek_beginning) return can_seek_beginning else: @@ -172,15 +213,37 @@ class _UserMessageIterator(_MessageIterator): def _bt_seek_beginning_from_native(self): self._user_seek_beginning() - def _create_input_port_message_iterator(self, input_port): + def _bt_can_seek_ns_from_origin_from_native(self, ns_from_origin): + # Return whether the iterator can seek ns from origin using the + # user-implemented seek_ns_from_origin method. We mimic the behavior + # of the C API: + # + # - If the iterator has a _user_can_seek_ns_from_origin method, + # call it and use its return value. + # - Otherwise, if there is a `_user_seek_ns_from_origin` method, + # we presume it's possible. + + if hasattr(self, '_user_can_seek_ns_from_origin'): + can_seek_ns_from_origin = self._user_can_seek_ns_from_origin(ns_from_origin) + utils._check_bool(can_seek_ns_from_origin) + return can_seek_ns_from_origin + else: + return hasattr(self, '_user_seek_ns_from_origin') + + def _bt_seek_ns_from_origin_from_native(self, ns_from_origin): + self._user_seek_ns_from_origin(ns_from_origin) + + def _create_message_iterator(self, input_port): utils._check_type(input_port, bt2_port._UserComponentInputPort) - msg_iter_ptr = native_bt.self_component_port_input_message_iterator_create_from_message_iterator( + ( + status, + msg_iter_ptr, + ) = native_bt.bt2_message_iterator_create_from_message_iterator( self._bt_ptr, input_port._ptr ) - - if msg_iter_ptr is None: - raise bt2._MemoryError('cannot create message iterator object') + utils._handle_func_status(status, 'cannot create message iterator object') + assert msg_iter_ptr is not None return _UserComponentInputPortMessageIterator(msg_iter_ptr)