upstream/ipython Files · IPython/qt/manager.py

Shut down kernels in parallel...

Shut down kernels in parallel When stopping the notebook server, it currently sends a shutdown request to each kernel and then waits for the process to finish. This can be slow if you have several kernels running. This makes it issues all the shutdown requests before waiting on the processes, so shutdown happens in parallel. KernelManager (and MultiKernelManager) gain three new public API methods to allow this: * request_shutdown (promoted from a private method) * wait_shutdown (refactored out of shutdown_kernel) * cleanup (refactored out of shutdown_kernel)

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      """ Defines a KernelClient that provides signals and slots.

      """

      from IPython.external.qt import QtCore

      # Local imports

      from IPython.utils.traitlets import Bool, DottedObjectName

      from IPython.kernel import KernelManager

      from IPython.kernel.restarter import KernelRestarter

      from .kernel_mixins import QtKernelManagerMixin, QtKernelRestarterMixin

      class QtKernelRestarter(KernelRestarter, QtKernelRestarterMixin):

          def start(self):

              if self._timer is None:

                  self._timer = QtCore.QTimer()

                  self._timer.timeout.connect(self.poll)

              self._timer.start(self.time_to_dead * 1000)

          def stop(self):

              self._timer.stop()

          def poll(self):

              super(QtKernelRestarter, self).poll()

      class QtKernelManager(KernelManager, QtKernelManagerMixin):

          """A KernelManager with Qt signals for restart"""

          client_class = DottedObjectName('IPython.qt.client.QtKernelClient')

          autorestart = Bool(True, config=True)

          def start_restarter(self):

              if self.autorestart and self.has_kernel:

                  if self._restarter is None:

                      self._restarter = QtKernelRestarter(

                          kernel_manager=self,

                          parent=self,

                          log=self.log,

                      )

                      self._restarter.add_callback(self._handle_kernel_restarted)

                  self._restarter.start()

          def stop_restarter(self):

              if self.autorestart:

                  if self._restarter is not None:

                      self._restarter.stop()

          def _handle_kernel_restarted(self):

              self.kernel_restarted.emit()

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				""" Defines a KernelClient that provides signals and slots.
				"""

				from IPython.external.qt import QtCore

				# Local imports
				from IPython.utils.traitlets import Bool, DottedObjectName

				from IPython.kernel import KernelManager
				from IPython.kernel.restarter import KernelRestarter

				from .kernel_mixins import QtKernelManagerMixin, QtKernelRestarterMixin


				class QtKernelRestarter(KernelRestarter, QtKernelRestarterMixin):

				def start(self):
				if self._timer is None:
				self._timer = QtCore.QTimer()
				self._timer.timeout.connect(self.poll)
				self._timer.start(self.time_to_dead * 1000)

				def stop(self):
				self._timer.stop()

				def poll(self):
				super(QtKernelRestarter, self).poll()


				class QtKernelManager(KernelManager, QtKernelManagerMixin):
				"""A KernelManager with Qt signals for restart"""

				client_class = DottedObjectName('IPython.qt.client.QtKernelClient')
				autorestart = Bool(True, config=True)

				def start_restarter(self):
				if self.autorestart and self.has_kernel:
				if self._restarter is None:
				self._restarter = QtKernelRestarter(
				kernel_manager=self,
				parent=self,
				log=self.log,
				)
				self._restarter.add_callback(self._handle_kernel_restarted)
				self._restarter.start()

				def stop_restarter(self):
				if self.autorestart:
				if self._restarter is not None:
				self._restarter.stop()

				def _handle_kernel_restarted(self):
				self.kernel_restarted.emit()