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# -*- test-case-name: twisted.conch.test.test_mixin -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Experimental optimization
This module provides a single mixin class which allows protocols to
collapse numerous small writes into a single larger one.
@author: Jp Calderone
"""
from twisted.internet import reactor
class BufferingMixin:
"""
Mixin which adds write buffering.
"""
_delayedWriteCall = None
data = None
DELAY = 0.0
def schedule(self):
return reactor.callLater(self.DELAY, self.flush)
def reschedule(self, token):
token.reset(self.DELAY)
def write(self, data):
"""
Buffer some bytes to be written soon.
Every call to this function delays the real write by C{self.DELAY}
seconds. When the delay expires, all collected bytes are written
to the underlying transport using L{ITransport.writeSequence}.
"""
if self._delayedWriteCall is None:
self.data = []
self._delayedWriteCall = self.schedule()
else:
self.reschedule(self._delayedWriteCall)
self.data.append(data)
def flush(self):
"""
Flush the buffer immediately.
"""
self._delayedWriteCall = None
self.transport.writeSequence(self.data)
self.data = None
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