def __init__(self):
"""Create a new MemoryAccessor."""
super(_MemoryAccessor, self).__init__("memory")
self._metric_to_points = collections.defaultdict(
sortedcontainers.SortedDict)
self._name_to_metric = {}
self._directory_names = sortedcontainers.SortedSet()
self.__downsampler = _downsampling.Downsampler()
self.__delayed_writer = _delayed_writer.DelayedWriter(self)
def setUp(self):
"""Set up a Downsampler, aggregating with the sum and average function."""
capacity_precisions = (self.CAPACITY, self.PRECISION, self.CAPACITY,
self.PRECISION**2)
retention_string = "%d*%ds:%d*%ds" % (capacity_precisions)
retention = bg_accessor.Retention.from_string(retention_string)
self.stage_0 = retention.stages[0]
self.stage_1 = retention.stages[1]
uid = uuid.uuid4()
metric_metadata = bg_accessor.MetricMetadata(
aggregator=bg_accessor.Aggregator.total, retention=retention)
self.metric_sum = bg_accessor.Metric(self.METRIC_NAME_SUM, uid,
metric_metadata)
uid = uuid.uuid4()
metric_metadata = bg_accessor.MetricMetadata(
aggregator=bg_accessor.Aggregator.average, retention=retention)
self.metric_avg = bg_accessor.Metric(self.METRIC_NAME_AVG, uid,
metric_metadata)
self.ds = bg_ds.Downsampler(self.CAPACITY)