add QtKernelManager with restarter

IPython/frontend/qt/manager.py

@@ -0,0 +1,52 b''
+""" Defines a KernelClient that provides signals and slots.
+"""
+
+from IPython.external.qt import QtCore
+
+# Local imports
+from IPython.utils.traitlets import Bool, Instance
+
+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"""
+
+    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,
+                    config=self.config,
+                    log=self.log,
+                )
+                self._restarter.register_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()

IPython/frontend/qt/kernel_mixins.py

@@ -168,6 +168,21 b' class QtHBChannelMixin(ChannelQObject):'
         self.kernel_died.emit(since_last_heartbeat)
 
 
+class QtKernelRestarterMixin(HasTraits, SuperQObject):
+
+    __metaclass__ = MetaQObjectHasTraits
+    _timer = None
+
+
+class QtKernelManagerMixin(HasTraits, SuperQObject):
+    """ A KernelClient that provides signals and slots.
+    """
+
+    __metaclass__ = MetaQObjectHasTraits
+
+    kernel_restarted = QtCore.Signal()
+
+
 class QtKernelClientMixin(HasTraits, SuperQObject):
     """ A KernelClient that provides signals and slots.
     """