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1from __future__ import absolute_import
2
3# System modules
4import time
5
6# Third-party modules
7
8# LLDB modules
9from .lldbtest import *
10
11
12class Stopwatch(object):
13    """Stopwatch provides a simple utility to start/stop your stopwatch multiple
14    times.  Each start/stop is equal to a lap, with its elapsed time accumulated
15    while measurment is in progress.
16
17    When you're ready to start from scratch for another round of measurements,
18    be sure to call the reset() method.
19
20    For example,
21
22    sw = Stopwatch()
23    for i in range(1000):
24        with sw:
25            # Do some length operations...
26            ...
27    # Get the average time.
28    avg_time = sw.avg()
29
30    # Reset the stopwatch as we are about to perform other kind of operations.
31    sw.reset()
32    ...
33    """
34
35    #############################################################
36    #
37    # Context manager interfaces to support the 'with' statement.
38    #
39    #############################################################
40
41    def __enter__(self):
42        """
43        Context management protocol on entry to the body of the with statement.
44        """
45        return self.start()
46
47    def __exit__(self, type, value, tb):
48        """
49        Context management protocol on exit from the body of the with statement.
50        """
51        self.stop()
52
53    def reset(self):
54        self.__laps__ = 0
55        self.__total_elapsed__ = 0.0
56        self.__start__ = None
57        self.__stop__ = None
58        self.__elapsed__ = 0.0
59        self.__nums__ = []
60
61    def __init__(self):
62        self.reset()
63
64    def start(self):
65        if self.__start__ is None:
66            self.__start__ = time.time()
67        else:
68            raise Exception(
69                "start() already called, did you forget to stop() first?")
70        # Return self to facilitate the context manager __enter__ protocol.
71        return self
72
73    def stop(self):
74        if self.__start__ is not None:
75            self.__stop__ = time.time()
76            elapsed = self.__stop__ - self.__start__
77            self.__total_elapsed__ += elapsed
78            self.__laps__ += 1
79            self.__nums__.append(elapsed)
80            self.__start__ = None  # Reset __start__ to be None again.
81        else:
82            raise Exception("stop() called without first start()?")
83
84    def laps(self):
85        """Gets the number of laps. One lap is equal to a start/stop action."""
86        return self.__laps__
87
88    def avg(self):
89        """Equal to total elapsed time divided by the number of laps."""
90        return self.__total_elapsed__ / self.__laps__
91
92    # def sigma(self):
93    #    """Return the standard deviation of the available samples."""
94    #    if self.__laps__ <= 0:
95    #        return None
96    #    return numpy.std(self.__nums__)
97
98    def __str__(self):
99        return "Avg: %f (Laps: %d, Total Elapsed Time: %f, min=%f, max=%f)" % (self.avg(
100        ), self.__laps__, self.__total_elapsed__, min(self.__nums__), max(self.__nums__))
101
102
103class BenchBase(TestBase):
104    """
105    Abstract base class for benchmark tests.
106    """
107
108    def setUp(self):
109        """Fixture for unittest test case setup."""
110        super(BenchBase, self).setUp()
111        # TestBase.setUp(self)
112        self.stopwatch = Stopwatch()
113
114    def tearDown(self):
115        """Fixture for unittest test case teardown."""
116        super(BenchBase, self).tearDown()
117        # TestBase.tearDown(self)
118        del self.stopwatch
119