'Start the L{twisted.logger} logging system.'

def startLogging(self):

    logFile = self._logFile
    fileLogObserverFactory = self._fileLogObserverFactory
    fileLogObserver = fileLogObserverFactory(logFile)
    logLevelPredicate = LogLevelFilterPredicate(defaultLogLevel=self._defaultLogLevel)
    filteringObserver = FilteringLogObserver(fileLogObserver, [logLevelPredicate])
    globalLogBeginner.beginLoggingTo([filteringObserver])
