Source code for spinnman.processes.most_direct_connection_selector
# Copyright (c) 2015 The University of Manchester
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from spinn_utilities.overrides import overrides
from spinnman.data import SpiNNManDataView
from .abstract_multi_connection_process_connection_selector import (
AbstractMultiConnectionProcessConnectionSelector)
[docs]class MostDirectConnectionSelector(
AbstractMultiConnectionProcessConnectionSelector):
"""
A selector that goes for the most direct connection for the message.
"""
__slots__ = [
"_connections",
"_first_connection"]
# pylint: disable=super-init-not-called
def __init__(self, connections):
"""
:param list(SCAMPConnection) connections:
The connections to be used
"""
self._connections = dict()
self._first_connection = None
for connection in connections:
if connection.chip_x == 0 and connection.chip_y == 0:
self._first_connection = connection
self._connections[
(connection.chip_x, connection.chip_y)] = connection
if self._first_connection is None:
self._first_connection = next(iter(connections))
[docs] @overrides(
AbstractMultiConnectionProcessConnectionSelector.get_next_connection)
def get_next_connection(self, message):
key = (message.sdp_header.destination_chip_x,
message.sdp_header.destination_chip_y)
if key in self._connections:
return self._connections[key]
if not SpiNNManDataView.has_machine() or len(self._connections) == 1:
return self._first_connection
x, y = key
key = SpiNNManDataView.get_nearest_ethernet(x, y)
if key in self._connections:
return self._connections[key]
else:
return self._first_connection