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""" Module for tracking execution time statistics from the Bcfg2
server core. This data is exposed by
:func:`Bcfg2.Server.Core.BaseCore.get_statistics`."""
class Statistic(object):
""" A single named statistic, tracking minimum, maximum, and
average execution time, and number of invocations. """
def __init__(self, name, initial_value):
"""
:param name: The name of this statistic
:type name: string
:param initial_value: The initial value to be added to this
statistic
:type initial_value: int or float
"""
self.name = name
self.min = float(initial_value)
self.max = float(initial_value)
self.ave = float(initial_value)
self.count = 1
def add_value(self, value):
""" Add a value to the statistic, recalculating the various
metrics.
:param value: The value to add to this statistic
:type value: int or float
"""
self.min = min(self.min, value)
self.max = max(self.max, value)
self.ave = (((self.ave * (self.count - 1)) + value) / self.count)
self.count += 1
def get_value(self):
""" Get a tuple of all the stats tracked on this named item.
The tuple is in the format::
(<name>, (min, max, average, number of values))
This makes it very easy to cast to a dict in
:func:`Statistics.display`.
:returns: tuple
"""
return (self.name, (self.min, self.max, self.ave, self.count))
class Statistics(object):
""" A collection of named :class:`Statistic` objects. """
def __init__(self):
self.data = dict()
def add_value(self, name, value):
""" Add a value to the named :class:`Statistic`. This just
proxies to :func:`Statistic.add_value` or the
:class:`Statistic` constructor as appropriate.
:param name: The name of the :class:`Statistic` to add the
value to
:type name: string
:param value: The value to add to the Statistic
:type value: int or float
"""
if name not in self.data:
self.data[name] = Statistic(name, value)
else:
self.data[name].add_value(value)
def display(self):
""" Return a dict of all :class:`Statistic` object values.
Keys are the statistic names, and values are tuples of the
statistic metrics as returned by
:func:`Statistic.get_value`. """
return dict([value.get_value() for value in list(self.data.values())])
#: A module-level :class:`Statistics` objects used to track all
#: execution time metrics for the server.
stats = Statistics() # pylint: disable=C0103
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