41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
# Copyright 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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from metrics import histogram_util
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BROWSER_HISTOGRAM = 'browser_histogram'
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RENDERER_HISTOGRAM = 'renderer_histogram'
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class HistogramMetric(object):
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def __init__(self, histogram, histogram_type):
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self.name = histogram['name']
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self.units = histogram['units']
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self.histogram_type = histogram_type
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self._start_values = dict()
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def Start(self, page, tab):
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"""Get the starting value for the histogram. This value will then be
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subtracted from the actual measurement."""
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data = self._GetHistogramFromDomAutomation(tab)
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if data:
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self._start_values[page.url + self.name] = data
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def GetValue(self, page, tab, results):
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data = self._GetHistogramFromDomAutomation(tab)
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if not data:
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return
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new_histogram = histogram_util.SubtractHistogram(
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data, self._start_values[page.url + self.name])
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results.Add(self.name, self.units, new_histogram,
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data_type='unimportant-histogram')
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@property
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def histogram_function(self):
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if self.histogram_type == BROWSER_HISTOGRAM:
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return 'getBrowserHistogram'
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return 'getHistogram'
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def _GetHistogramFromDomAutomation(self, tab):
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return histogram_util.GetHistogramFromDomAutomation(
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self.histogram_function, self.name, tab)
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