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DEV: Separate FileCheckpointManager and GenericFileCheckpointManager....
DEV: Separate FileCheckpointManager and GenericFileCheckpointManager. - Adds a `GenericCheckpointMixin` as a helper for implementing the two boundary-traversing Checkpoint API methods, `create_checkpoint` and `restore_checkpoint`. - `GenericFileCheckpointManager` is implemented as a subclass of `FileCheckpointManager` using `GenericCheckpointMixin`. Note that this is the safe subtyping relationship because of method signature *contra*variance: `FileCheckpointManager` accepts `FileContentsManager` in its method signatures type, whereas `GenericFileCheckpointManager` accepts any `ContentsManager`. - Moved Checkpoint-related classes to their own files.

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restarter.py
54 lines | 1.7 KiB | text/x-python | PythonLexer
"""A basic in process kernel monitor with autorestarting.
This watches a kernel's state using KernelManager.is_alive and auto
restarts the kernel if it dies.
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2013 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from __future__ import absolute_import
from zmq.eventloop import ioloop
from IPython.kernel.restarter import KernelRestarter
from IPython.utils.traitlets import (
Instance,
)
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
class IOLoopKernelRestarter(KernelRestarter):
"""Monitor and autorestart a kernel."""
loop = Instance('zmq.eventloop.ioloop.IOLoop', allow_none=False)
def _loop_default(self):
return ioloop.IOLoop.instance()
_pcallback = None
def start(self):
"""Start the polling of the kernel."""
if self._pcallback is None:
self._pcallback = ioloop.PeriodicCallback(
self.poll, 1000*self.time_to_dead, self.loop
)
self._pcallback.start()
def stop(self):
"""Stop the kernel polling."""
if self._pcallback is not None:
self._pcallback.stop()
self._pcallback = None