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