Beispiel #1
0
 def run(self, installSignalHandlers=True):
     if self._ownApp:
         self._blockApp = self.qApp
     else:
         self._blockApp = QEventLoop()
     self.runReturn()
     self._blockApp.exec_()
Beispiel #2
0
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_()