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import copy
class Stats(dict):
def __init__(self, count=0, total=0.0, min=0.0, max=0.0,
sum_of_squares=0.0):
# Attribute names here must not change as this is what
# New Relic uses. Easier to adopt that convention rather
# than something slightly different.
self.count = count
self.total = total
self.min = min
self.max = max
self.sum_of_squares = sum_of_squares
def __setattr__(self, name, value):
self[name] = value
def __getattr__(self, name):
return self[name]
def merge_stats(self, other):
self.total += other.total
self.min = self.count and min(self.min, other.min) or other.min
self.max = max(self.max, other.max)
self.sum_of_squares += other.sum_of_squares
self.count += other.count
def merge_value(self, value):
self.total += value
self.min = self.count and min(self.min, value) or value
self.max = max(self.max, value)
self.sum_of_squares += value ** 2
self.count += 1
class Metrics(object):
def __init__(self):
self.metrics = {}
def __iter__(self):
return iter(self.metrics.items())
def __len__(self):
return len(self.metrics)
def assign_value(self, name, value):
if isinstance(value, Stats):
sample = copy.copy(value)
self.metrics[name] = sample
else:
sample = Stats()
self.metrics[name] = sample
sample.merge_value(value)
return sample
def merge_value(self, name, value):
sample = self.fetch_stats(name)
if isinstance(value, Stats):
sample.merge_stats(value)
else:
sample.merge_value(value)
return sample
def fetch_stats(self, name):
sample = self.metrics.get(name)
if sample is None:
sample = Stats()
self.metrics[name] = sample
return sample
def merge_metrics(self, metrics):
for name, stats in metrics:
self.merge_value(name, stats)
def assign_metrics(self, metrics):
for name, stats in metrics:
self.assign_value(name, stats)
def clear_metrics(self):
self.metrics.clear()
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