Commit dc8ecc5d authored by Valentin Valls's avatar Valentin Valls
Browse files

Allow to set priority during the _create_stream

parent e4bed8ac
......@@ -724,6 +724,9 @@ class DataNode(metaclass=DataNodeMetaClass):
self.__db_name = db_name
self.node_type = node_type
self._priorities = {}
"""Hold priorities per streams only during the initialization"""
# The info dictionary associated to the DataNode
self._info = settings.HashObjSetting(f"{db_name}_info", connection=connection)
info_dict = self._init_info(create=create, **kwargs)
......@@ -808,14 +811,20 @@ class DataNode(metaclass=DataNodeMetaClass):
kw.setdefault("connection", self.db_connection)
return streaming.DataStream(name, **kw)
def _create_stream(self, suffix, **kw):
def _create_stream(self, suffix, priority: int = None, **kw):
"""Create a stream associated to this DataNode.
:param str suffix:
:param int priority: data from streams with a lower priority is never
yielded as long as higher priority streams have
data. Lower number means higher priority.
:param `**kw`: see `_create_nonassociated_stream`
:returns DataStream:
return self._create_nonassociated_stream(f"{self.db_name}_{suffix}", **kw)
stream = self._create_nonassociated_stream(f"{self.db_name}_{suffix}", **kw)
if priority is not None:
self._priorities[] = priority
return stream
def _streamid_to_idx(cls, streamID):
......@@ -1362,6 +1371,14 @@ class DataNode(metaclass=DataNodeMetaClass):
if not self.db_connection.exists(stream_name):
stream = self._create_nonassociated_stream(stream_name)
if "priority" not in kw:
# If the priority is not forced by the _subscribe_stream arguments
# Use the one from the config
priority = self._priorities.pop(, None)
if priority is not None:
kw["priority"] = priority
reader.add_streams(stream, node=self, first_index=first_index, **kw)
def _subscribe_streams(
......@@ -23,7 +23,8 @@ class ScanNode(DataNodeContainer):
def __init__(self, name, **kwargs):
super().__init__(self._NODE_TYPE, name, **kwargs)
self._sync_stream = self._create_stream("data")
# Lower priority than all other streams
self._sync_stream = self._create_stream("data", priority=1)
def dataset(self):
......@@ -80,19 +81,6 @@ class ScanNode(DataNodeContainer):
def get_settings(self):
return super().get_settings() + [self._sync_stream]
def _subscribe_stream(self, stream_suffix, reader, first_index=None, **kw):
"""Subscribe to a particular stream associated with this node.
:param str stream_suffix: stream to add is "{db_name}_{stream_suffix}"
:param DataStreamReader reader:
:param str or int first_index: Redis stream index (None is now)
stream_suffix_with_sepator = f"_{stream_suffix}"
# Lower priority than all other streams
kw["priority"] = 1
super()._subscribe_stream(stream_suffix, reader, first_index=first_index, **kw)
def _subscribe_streams(self, reader, first_index=None, **kw):
"""Subscribe to all associated streams of this node.
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