def run(self, installSignalHandlers=True):
if self._ownApp:
self._blockApp = self.qApp
else:
self._blockApp = QEventLoop()
self.runReturn()
self._blockApp.exec_()
class QtReactor(posixbase.PosixReactorBase):
implements(IReactorFDSet)
def __init__(self):
self._reads = {}
self._writes = {}
self._notifiers = {}
self._timer = QTimer()
self._timer.setSingleShot(True)
QObject.connect(self._timer, SIGNAL("timeout()"), self.iterate)
if QCoreApplication.instance() is None:
# Application Object has not been started yet
self.qApp=QCoreApplication([])
self._ownApp=True
else:
self.qApp = QCoreApplication.instance()
self._ownApp=False
self._blockApp = None
posixbase.PosixReactorBase.__init__(self)
# Workaround for some bugs in the Twisted POSIXReactorBase class (see
# docs for _cleanup_reactor).
self.addSystemEventTrigger('after', 'shutdown', self._cleanup_reactor)
def _cleanup_reactor(self):
"""
Workaround some bugs in the Twisted POSIXReactorBase class that causes
an application to be kept alive even after reactor.stop() has been
called.
"""
for r in list(self._internalReaders):
self.removeReader(r)
def _add(self, xer, primary, type):
"""
Private method for adding a descriptor from the event loop.
It takes care of adding it if new or modifying it if already added
for another state (read -> read/write for example).
"""
if xer not in primary:
primary[xer] = TwistedSocketNotifier(None, self, xer, type)
def addReader(self, reader):
"""
Add a FileDescriptor for notification of data available to read.
"""
self._add(reader, self._reads, QSocketNotifier.Read)
def addWriter(self, writer):
"""
Add a FileDescriptor for notification of data available to write.
"""
self._add(writer, self._writes, QSocketNotifier.Write)
def _remove(self, xer, primary):
"""
Private method for removing a descriptor from the event loop.
It does the inverse job of _add, and also add a check in case of the fd
has gone away.
"""
if xer in primary:
notifier = primary.pop(xer)
notifier.shutdown()
def removeReader(self, reader):
"""
Remove a Selectable for notification of data available to read.
"""
self._remove(reader, self._reads)
def removeWriter(self, writer):
"""
Remove a Selectable for notification of data available to write.
"""
self._remove(writer, self._writes)
def removeAll(self):
"""
Remove all selectables, and return a list of them.
"""
rv = self._removeAll(self._reads, self._writes)
return rv
def getReaders(self):
return self._reads.keys()
def getWriters(self):
return self._writes.keys()
def callLater(self,howlong, *args, **kargs):
rval = super(QtReactor,self).callLater(howlong, *args, **kargs)
self.reactorInvocation()
return rval
def reactorInvocation(self):
self._timer.stop()
self._timer.setInterval(0)
self._timer.start()
def _iterate(self, delay=None, fromqt=False):
"""See twisted.internet.interfaces.IReactorCore.iterate.
"""
self.runUntilCurrent()
self.doIteration(delay, fromqt)
iterate = _iterate
def doIteration(self, delay=None, fromqt=False):
'This method is called by a Qt timer or by network activity on a file descriptor'
if not self.running and self._blockApp:
self._blockApp.quit()
self._timer.stop()
delay = max(delay, 1)
if not fromqt:
self.qApp.processEvents(QEventLoop.AllEvents, delay * 1000)
if self.timeout() is None:
timeout = 0.1
elif self.timeout() == 0:
timeout = 0
else:
timeout = self.timeout()
self._timer.setInterval(timeout * 1000)
self._timer.start()
def runReturn(self, installSignalHandlers=True):
self.startRunning(installSignalHandlers=installSignalHandlers)
self.reactorInvocation()
def run(self, installSignalHandlers=True):
if self._ownApp:
self._blockApp = self.qApp
else:
self._blockApp = QEventLoop()
self.runReturn()
self._blockApp.exec_()