t.i.a.FileDescriptor(_ConsumerMixin, _LogOwner) : class documentation

Part of twisted.internet.abstract View Source View In Hierarchy

Known subclasses: twisted.internet.base.BasePort, twisted.internet.inotify.INotify, twisted.internet.process.ProcessReader, twisted.internet.process.ProcessWriter, twisted.internet.process.PTYProcess, twisted.internet.serialport.SerialPort, twisted.internet.serialport.SerialPort, twisted.internet.tcp.Connection

Implements interfaces: twisted.internet.interfaces.IConsumer, twisted.internet.interfaces.IHalfCloseableDescriptor, twisted.internet.interfaces.IPushProducer, twisted.internet.interfaces.IReadWriteDescriptor, twisted.internet.interfaces.ITransport

An object which can be operated on by select().

This is an abstract superclass of all objects which may be notified when they are readable or writable; e.g. they have a file-descriptor that is valid to be passed to select(2).

Method __init__ Undocumented
Method connectionLost The connection was lost.
Method writeSomeData Write as much as possible of the given data, immediately.
Method doRead Called when data is available for reading.
Method doWrite Called when data can be written.
Method writeConnectionLost Indicates write connection was lost.
Method readConnectionLost Indicates read connection was lost.
Method write Reliably write some data.
Method writeSequence Reliably write a sequence of data.
Method loseConnection Close the connection at the next available opportunity.
Method loseWriteConnection Undocumented
Method stopReading Stop waiting for read availability.
Method stopWriting Stop waiting for write availability.
Method startReading Start waiting for read availability.
Method startWriting Start waiting for write availability.
Method stopConsuming Stop consuming data.
Method resumeProducing Resume producing data.
Method pauseProducing Pause producing data.
Method stopProducing Undocumented
Method fileno File Descriptor number for select().
Method _postLoseConnection Called after a loseConnection(), when all data has been written.
Method _closeWriteConnection Undocumented
Method _isSendBufferFull Determine whether the user-space send buffer for this transport is full or not.
Method _maybePauseProducer Possibly pause a producer, if there is one and the send buffer is full.

Inherited from _ConsumerMixin:

Instance Variable producer None if no producer is registered, otherwise the registered producer.
Instance Variable producerPaused A flag indicating whether the producer is currently paused. (type: bool or int)
Instance Variable streamingProducer 0 A flag indicating whether the producer was registered as a streaming (ie push) producer or not (ie a pull producer). This will determine whether the consumer may ever need to pause and resume it, or if it can merely call resumeProducing on it when buffer space is available.
Instance Variable streamingProducer bool or int
Method registerProducer Register to receive data from a producer.
Method unregisterProducer Stop consuming data from a producer, without disconnecting.

Inherited from _LogOwner:

Method logPrefix Override this method to insert custom logging behavior. Its return value will be inserted in front of every line. It may be called more times than the number of output lines.
Method _getLogPrefix Determine the log prefix to use for messages related to applicationObject, which may or may not be an interfaces.ILoggingContext provider.
def __init__(self, reactor=None): (source)
Undocumented
def connectionLost(self, reason): (source)
The connection was lost.

This is called when the connection on a selectable object has been lost. It will be called whether the connection was closed explicitly, an exception occurred in an event handler, or the other end of the connection closed it first.

Clean up state here, but make sure to call back up to FileDescriptor.

def writeSomeData(self, data): (source)
Write as much as possible of the given data, immediately.

This is called to invoke the lower-level writing functionality, such as a socket's send() method, or a file's write(); this method returns an integer or an exception. If an integer, it is the number of bytes written (possibly zero); if an exception, it indicates the connection was lost.

def doRead(self): (source)
Called when data is available for reading.

Subclasses must override this method. The result will be interpreted in the same way as a result of doWrite().

def doWrite(self): (source)
Called when data can be written.

A result that is true (which will be a negative number or an exception instance) indicates that the connection was lost. A false result implies the connection is still there; a result of 0 indicates no write was done, and a result of None indicates that a write was done.

def _postLoseConnection(self): (source)
Called after a loseConnection(), when all data has been written.

Whatever this returns is then returned by doWrite.

def _closeWriteConnection(self): (source)
Undocumented
def writeConnectionLost(self, reason): (source)
Indicates write connection was lost.
def readConnectionLost(self, reason): (source)
Indicates read connection was lost.
def _isSendBufferFull(self): (source)
Determine whether the user-space send buffer for this transport is full or not.

When the buffer contains more than self.bufferSize bytes, it is considered full. This might be improved by considering the size of the kernel send buffer and how much of it is free.

ReturnsTrue if it is full, False otherwise.
def _maybePauseProducer(self): (source)
Possibly pause a producer, if there is one and the send buffer is full.
def write(self, data): (source)
Reliably write some data.

The data is buffered until the underlying file descriptor is ready for writing. If there is more than self.bufferSize data in the buffer and this descriptor has a registered streaming producer, its pauseProducing() method will be called.

def writeSequence(self, iovec): (source)
Reliably write a sequence of data.

Currently, this is a convenience method roughly equivalent to:

   for chunk in iovec:
       fd.write(chunk)

It may have a more efficient implementation at a later time or in a different reactor.

As with the write() method, if a buffer size limit is reached and a streaming producer is registered, it will be paused until the buffered data is written to the underlying file descriptor.

def loseConnection(self, _connDone=failure.Failure(main.CONNECTION_DONE)): (source)
Close the connection at the next available opportunity.

Call this to cause this FileDescriptor to lose its connection. It will first write any data that it has buffered.

If there is data buffered yet to be written, this method will cause the transport to lose its connection as soon as it's done flushing its write buffer. If you have a producer registered, the connection won't be closed until the producer is finished. Therefore, make sure you unregister your producer when it's finished, or the connection will never close.

def loseWriteConnection(self): (source)
Undocumented
def stopReading(self): (source)
Stop waiting for read availability.

Call this to remove this selectable from being notified when it is ready for reading.

def stopWriting(self): (source)
Stop waiting for write availability.

Call this to remove this selectable from being notified when it is ready for writing.

def startReading(self): (source)
Start waiting for read availability.
def startWriting(self): (source)
Start waiting for write availability.

Call this to have this FileDescriptor be notified whenever it is ready for writing.

def stopConsuming(self): (source)
Stop consuming data.

This is called when a producer has lost its connection, to tell the consumer to go lose its connection (and break potential circular references).

def resumeProducing(self): (source)
Resume producing data.

This tells a producer to re-add itself to the main loop and produce more data for its consumer.

def pauseProducing(self): (source)
Pause producing data.

Tells a producer that it has produced too much data to process for the time being, and to stop until resumeProducing() is called.

def stopProducing(self): (source)
Undocumented
def fileno(self): (source)
File Descriptor number for select().

This method must be overridden or assigned in subclasses to indicate a valid file descriptor for the operating system.

API Documentation for Twisted, generated by pydoctor at 2012-06-04 17:20:01.