lldb/examples/summaries/cocoa/metrics.py

import lldb

class Counter:
	def __init__(self):
		self.count = 0
		self.list = []
	def update(self,name):
		self.count = self.count + 1
		# avoid getting the full dump of this ValueObject just to save its metrics
		if isinstance(name,lldb.SBValue):
			self.list.append(name.GetName())
		else:
			self.list.append(str(name))
	def __str__(self):
		return str(self.count) + " times, for items [" + str(self.list) + "]"

class MetricsPrinter_Verbose:
	def __init__(self,metrics):
		self.metrics = metrics
	def __str__(self):
		string = ""
		for key,value in self.metrics.metrics.items():
			string = string + "metric " + str(key) + ": " + str(value) + "\n"
		return string

class MetricsPrinter_Compact:
	def __init__(self,metrics):
		self.metrics = metrics
	def __str__(self):
		string = ""
		for key,value in self.metrics.metrics.items():
			string = string + "metric " + str(key) + " was hit " + str(value.count) + " times\n"
		return string

class Metrics:
	def __init__(self):
		self.metrics = {}

	def add_metric(self,name):
		self.metrics[name] = Counter()

	def metric_hit(self,metric,trigger):
		self.metrics[metric].update(trigger)

	def __getitem__(self,key):
		return self.metrics[key]

	def __getattr__(self,name):
		if name == 'compact':
			return MetricsPrinter_Compact(self)
		if name == 'verbose':
			return MetricsPrinter_Verbose(self)
		raise AttributeError("%r object has no attribute %r" %
			                         (type(self).__name__, name))

	def __str__(self):
		return str(self.verbose)

	def metric_success(self,metric):
		total_count = 0
		metric_count = self[metric].count
		for key,value in self.metrics.items():
			total_count = total_count + value.count
		if total_count > 0:
			return metric_count / float(total_count)
		return 0