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""" Defines a KernelClient that provides signals and slots.
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"""
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from IPython.external.qt import QtCore
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# Local imports
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from IPython.utils.traitlets import Bool, Instance
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from IPython.kernel import KernelManager
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from IPython.kernel.restarter import KernelRestarter
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from .kernel_mixins import QtKernelManagerMixin, QtKernelRestarterMixin
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class QtKernelRestarter(KernelRestarter, QtKernelRestarterMixin):
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def start(self):
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if self._timer is None:
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self._timer = QtCore.QTimer()
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self._timer.timeout.connect(self.poll)
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self._timer.start(self.time_to_dead * 1000)
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def stop(self):
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self._timer.stop()
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def poll(self):
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super(QtKernelRestarter, self).poll()
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class QtKernelManager(KernelManager, QtKernelManagerMixin):
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"""A KernelManager with Qt signals for restart"""
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autorestart = Bool(True, config=True)
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def start_restarter(self):
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if self.autorestart and self.has_kernel:
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if self._restarter is None:
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self._restarter = QtKernelRestarter(
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kernel_manager=self,
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config=self.config,
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log=self.log,
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)
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self._restarter.add_callback(self._handle_kernel_restarted)
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self._restarter.start()
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def stop_restarter(self):
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if self.autorestart:
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if self._restarter is not None:
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self._restarter.stop()
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def _handle_kernel_restarted(self):
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self.kernel_restarted.emit()
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