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"""A kernel client for in-process kernels."""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from IPython.kernel.channelsabc import HBChannelABC
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from .socket import DummySocket
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#-----------------------------------------------------------------------------
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# Channel classes
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#-----------------------------------------------------------------------------
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class InProcessChannel(object):
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"""Base class for in-process channels."""
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proxy_methods = []
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def __init__(self, client=None):
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super(InProcessChannel, self).__init__()
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self.client = client
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self._is_alive = False
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def is_alive(self):
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return self._is_alive
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def start(self):
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self._is_alive = True
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def stop(self):
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self._is_alive = False
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def call_handlers(self, msg):
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""" This method is called in the main thread when a message arrives.
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Subclasses should override this method to handle incoming messages.
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"""
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raise NotImplementedError('call_handlers must be defined in a subclass.')
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def flush(self, timeout=1.0):
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pass
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def call_handlers_later(self, *args, **kwds):
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""" Call the message handlers later.
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The default implementation just calls the handlers immediately, but this
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method exists so that GUI toolkits can defer calling the handlers until
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after the event loop has run, as expected by GUI frontends.
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"""
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self.call_handlers(*args, **kwds)
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def process_events(self):
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""" Process any pending GUI events.
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This method will be never be called from a frontend without an event
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loop (e.g., a terminal frontend).
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"""
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raise NotImplementedError
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class InProcessHBChannel(object):
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"""A dummy heartbeat channel interface for in-process kernels.
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Normally we use the heartbeat to check that the kernel process is alive.
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When the kernel is in-process, that doesn't make sense, but clients still
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expect this interface.
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"""
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time_to_dead = 3.0
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def __init__(self, client=None):
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super(InProcessHBChannel, self).__init__()
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self.client = client
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self._is_alive = False
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self._pause = True
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def is_alive(self):
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return self._is_alive
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def start(self):
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self._is_alive = True
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def stop(self):
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self._is_alive = False
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def pause(self):
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self._pause = True
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def unpause(self):
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self._pause = False
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def is_beating(self):
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return not self._pause
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HBChannelABC.register(InProcessHBChannel)
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