upstream/ipython Files · IPython/external/appnope/_dummy.py

avoid race condition when deleting/starting sessions...

avoid race condition when deleting/starting sessions javascript doesn't guarantee the order of AJAX requests, so we give `Session.delete` and `Kernel.kill` a callback signature. Changing the kernel type calls `Notebook.start_kernel`, which terminates the previous session, if defined, before starting the new one. A flag is stored, to prevent multiple simultaneous attempts to start sessions, raising a SessionAlreadyStarting Error, preventing the spec_changed event from firing.

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             _dummy.py
        
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      #-----------------------------------------------------------------------------

      #  Copyright (C) 2013 Min RK

      #

      #  Distributed under the terms of the 2-clause BSD License.

      #-----------------------------------------------------------------------------

      from contextlib import contextmanager

      def beginActivityWithOptions(options, reason=""):

          return

      def endActivity(activity):

          return

      def nope():

          return

      def nap():

          return

      @contextmanager

      def nope_scope(

              options=0,

              reason="Because Reasons"

          ):

          yield

      def napping_allowed():

          return True

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				#-----------------------------------------------------------------------------
				# Copyright (C) 2013 Min RK
				#
				# Distributed under the terms of the 2-clause BSD License.
				#-----------------------------------------------------------------------------

				from contextlib import contextmanager

				def beginActivityWithOptions(options, reason=""):
				return

				def endActivity(activity):
				return

				def nope():
				return

				def nap():
				return


				@contextmanager
				def nope_scope(
				options=0,
				reason="Because Reasons"
				):
				yield

				def napping_allowed():
				return True