Python twisted.internet.interfaces.IProducer() Examples

def registerProducer(self, producer, streaming):
        """
        Register a producer and start asking it for data if it is
        non-streaming.

        @type producer: L{IProducer <interfaces.IProducer>}
        @param producer: A producer.

        @type streaming: L{bool}
        @param streaming: A flag indicating whether the producer provides a
            streaming interface.
        """
        self.myproducer = producer
        self.streaming = streaming
        if not streaming:
            self.prodProducer() 

def registerProducer(self, producer, streaming):
        """
        Register to receive data from a producer.

        This sets self to be a consumer for a producer.  When this object runs
        out of data (as when a send(2) call on a socket succeeds in moving the
        last data from a userspace buffer into a kernelspace buffer), it will
        ask the producer to resumeProducing().

        For L{IPullProducer} providers, C{resumeProducing} will be called once
        each time data is required.

        For L{IPushProducer} providers, C{pauseProducing} will be called
        whenever the write buffer fills up and C{resumeProducing} will only be
        called when it empties.

        @type producer: L{IProducer} provider
        @param producer: The L{IProducer} that will be producing data.

        @type streaming: L{bool}
        @param streaming: C{True} if C{producer} provides L{IPushProducer},
        C{False} if C{producer} provides L{IPullProducer}.

        @raise RuntimeError: If a producer is already registered.

        @return: L{None}
        """
        if self._requestProducer is not None:
            raise RuntimeError(
                "Cannot register producer %s, because producer %s was never "
                "unregistered." % (producer, self._requestProducer))

        if not streaming:
            producer = _PullToPush(producer, self)

        self._requestProducer = producer
        self._requestProducerStreaming = streaming

        if not streaming:
            producer.startStreaming() 

def test_interface(self):
        """
        L{basic.FileSender} implements the L{IPullProducer} interface.
        """
        sender = basic.FileSender()
        self.assertTrue(verifyObject(IProducer, sender)) 

def pauseProducing(self):
        """IProducer implementation tracking if we should pause output"""
        self._paused = True 

def resumeProducing(self):
        """IProducer implementation tracking when we should resume output"""
        self._paused = False 

def stopProducing(self):
        """IProducer implementation tracking when we should stop"""
        self._paused = True
        self._should_stop = True 

def registerProducer(self, producer, streaming):
        """
        Register to receive data from a producer.

        This sets self to be a consumer for a producer.  When this object runs
        out of data (as when a send(2) call on a socket succeeds in moving the
        last data from a userspace buffer into a kernelspace buffer), it will
        ask the producer to resumeProducing().

        For L{IPullProducer} providers, C{resumeProducing} will be called once
        each time data is required.

        For L{IPushProducer} providers, C{pauseProducing} will be called
        whenever the write buffer fills up and C{resumeProducing} will only be
        called when it empties.

        @type producer: L{IProducer} provider
        @param producer: The L{IProducer} that will be producing data.

        @type streaming: L{bool}
        @param streaming: C{True} if C{producer} provides L{IPushProducer},
        C{False} if C{producer} provides L{IPullProducer}.

        @raise RuntimeError: If a producer is already registered.

        @return: L{None}
        """
        if self._requestProducer is not None:
            raise RuntimeError(
                "Cannot register producer %s, because producer %s was never "
                "unregistered." % (producer, self._requestProducer))

        if not streaming:
            producer = _PullToPush(producer, self)

        self._requestProducer = producer
        self._requestProducerStreaming = streaming

        if not streaming:
            producer.startStreaming() 

def test_interface(self):
        """
        L{basic.FileSender} implements the L{IPullProducer} interface.
        """
        sender = basic.FileSender()
        self.assertTrue(verifyObject(IProducer, sender)) 

def pause_reading(self):
        # interfaces are the stupedist crap ever
        if (hasattr(interfaces.IProducer, "providedBy") and
            not interfaces.IProducer.providedBy(self.transport)):
            print "No producer", self.ip, self.port, self.transport
            return
        # not explicitly needed, but iocpreactor has a bug where the author is a moron
        if self.paused:
            return
        self.transport.pauseProducing()
        self.paused = True 

def resume_reading(self):
        if (hasattr(interfaces.IProducer, "providedBy") and
            not interfaces.IProducer.providedBy(self.transport)):
            print "No producer", self.ip, self.port, self.transport
            return
        # not explicitly needed, but iocpreactor has a bug where the author is a moron
        if not self.paused:
            return
        self.paused = False
        try:
            self.transport.resumeProducing()
        except Exception, e:
            # I bet these are harmless
            print "resumeProducing error", type(e), e