def createCSSClientObjects(cmdParser):
"""\
Create the client objects needed to engage in the CSS-WC and CSS-TS protocols.
:param cmdParser the command line parser object
"""
args = cmdParser.args
sysclock=SysClock()
wallClock=TunableClock(sysclock,tickRate=1000000000) # nanos
# measure precision of wall clock empirically
wcPrecisionNanos = measurePrecision(wallClock) * 1000000000
algorithm = LowestDispersionCandidate(wallClock,repeatSecs=0.3,timeoutSecs=0.3)
wcClient=WallClockClient(cmdParser.wcBind, args.wcUrl[0], wallClock, algorithm)
timelineClock = CorrelatedClock(wallClock, args.timelineClockFrequency)
# start recording dispersion of the wall clock
dispRecorder=DispersionRecorder(algorithm)
dispRecorder.start()
print "Connecting, requesting timeline for:"
print " Any contentId beginning with:", args.contentIdStem
print " and using timeline selector: ", args.timelineSelector
print
ts = TSClientClockController(args.tsUrl[0], args.contentIdStem, args.timelineSelector, timelineClock, correlationChangeThresholdSecs=0.0)
return (ts, timelineClock, args.timelineClockFrequency, wcClient, wallClock, wcPrecisionNanos, dispRecorder)
def test_errorIfToEarly(self):
algorithm = Mock_Algorithm()
recorder = DispersionRecorder(algorithm)
recorder.start()
algorithm.onClockAdjusted( 1000, 0, 0, 100, 2 )
self.assertRaises(ValueError, recorder.dispersionAt, 999)
def test_recordsSimple(self):
algorithm = Mock_Algorithm()
recorder = DispersionRecorder(algorithm)
recorder.start()
algorithm.onClockAdjusted( 1000, 0, 0, 100, 2 )
self.assertEquals(102, recorder.dispersionAt(1001))
def test_multipleHistoryEntries(self):
algorithm = Mock_Algorithm()
recorder = DispersionRecorder(algorithm)
recorder.start()
algorithm.onClockAdjusted( 1000, 0, 0, 100, 2 )
algorithm.onClockAdjusted( 2000, 3, 1994, 110, 2 )
algorithm.onClockAdjusted( 3000, -2, 2114, 90, 3 )
self.assertEquals( 100+ 2, recorder.dispersionAt(1001))
self.assertEquals( 100+100, recorder.dispersionAt(1050))
self.assertEquals( 110+ 12, recorder.dispersionAt(2006))
self.assertEquals( 90+ 9, recorder.dispersionAt(3003))
def test_multipleHistoryEntries(self):
algorithm = Mock_Algorithm()
recorder = DispersionRecorder(algorithm)
recorder.start()
algorithm.onClockAdjusted(1000, 0, 0, 100, 2)
algorithm.onClockAdjusted(2000, 3, 1994, 110, 2)
algorithm.onClockAdjusted(3000, -2, 2114, 90, 3)
self.assertEquals(100 + 2, recorder.dispersionAt(1001))
self.assertEquals(100 + 100, recorder.dispersionAt(1050))
self.assertEquals(110 + 12, recorder.dispersionAt(2006))
self.assertEquals(90 + 9, recorder.dispersionAt(3003))
