upstream/ipython Files · IPython/utils/log.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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      """Grab the global logger instance."""

      # Copyright (c) IPython Development Team.

      # Distributed under the terms of the Modified BSD License.

      import logging

      _logger = None

      def get_logger():

          """Grab the global logger instance.

          If a global IPython Application is instantiated, grab its logger.

          Otherwise, grab the root logger.

          """

          global _logger

          if _logger is None:

              from IPython.config import Application

              if Application.initialized():

                  _logger = Application.instance().log

              else:

                  logging.basicConfig()

                  _logger = logging.getLogger()

          return _logger

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				"""Grab the global logger instance."""

				# Copyright (c) IPython Development Team.
				# Distributed under the terms of the Modified BSD License.

				import logging

				_logger = None

				def get_logger():
				"""Grab the global logger instance.

				If a global IPython Application is instantiated, grab its logger.
				Otherwise, grab the root logger.
				"""
				global _logger

				if _logger is None:
				from IPython.config import Application
				if Application.initialized():
				_logger = Application.instance().log
				else:
				logging.basicConfig()
				_logger = logging.getLogger()
				return _logger