async def _start_new_async_iter(self, exec_unit: ExecutionUnitInfo,
async_gen_obj, target_id: str,
request: RequestInfo):
"""Attempt to start a new async generator running.
This will check for previous generators for this same variable, and cancel them.
"""
# Check if a previous iterator exists for this variable.
if exec_unit.display_id in self._registered_generators:
old_start, old_task = self._registered_generators[
exec_unit.display_id]
new_start = now()
if new_start > old_start:
old_task.cancel()
new_task = self._eventloop.create_task(
self._run_async_iter(new_start, exec_unit, async_gen_obj,
target_id, request))
self._registered_generators[
exec_unit.display_id] = new_start, new_task
else:
new_start = now()
new_task = self._eventloop.create_task(
self._run_async_iter(new_start, exec_unit, async_gen_obj,
target_id, request))
self._registered_generators[
exec_unit.display_id] = new_start, new_task
def init_metadata(self, parent):
"""Initialize metadata.
Run at the beginning of execution requests.
"""
# FIXME: `started` is part of ipyparallel
# Remove for yapkernel 5.0
return {
'started': now(),
}
def init_metadata(self, parent):
"""Initialize metadata.
Run at the beginning of execution requests.
"""
# FIXME: `started` is part of ipyparallel
# Remove for yap_kernel 5.0
return {
'started': now(),
}
