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rstudio/src/cpp/core/PerformanceTimer.cpp at master · UXScripts/rstudio · GitHub
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PerformanceTimer.cpp
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/*
* PerformanceTimer.cpp
*
* Copyright (C) 2009-12 by RStudio, Inc.
*
* This program is licensed to you under the terms of version 3 of the
* GNU Affero General Public License. This program is distributed WITHOUT
* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
*
*/
#
include
<
core/PerformanceTimer.hpp
>
#
include
<
iostream
>
#
include
<
iomanip
>
using
namespace
boost
::posix_time
;
namespace
core
{
PerformanceTimer::PerformanceTimer
()
: startTime_(ptime(not_a_date_time))
{
}
PerformanceTimer::PerformanceTimer
(
const
std::string& step)
: startTime_(ptime(not_a_date_time))
{
start
(step);
}
PerformanceTimer::~PerformanceTimer
()
{
try
{
if
(
running
())
{
stop
();
std::cerr << *
this
;
}
}
catch
(...)
{
}
}
void
PerformanceTimer::start
(
const
std::string& step)
{
BOOST_ASSERT
(!
running
());
//
reset state
startTime_ =
now
();
steps_.
clear
();
//
advance to step
advance
(step);
}
void
PerformanceTimer::advance
(
const
std::string& step)
{
BOOST_ASSERT
(
running
());
//
if there is an existing step pending then record its duration
recordPendingStep
();
//
record the start time and add a step
startTime_ =
now
();
steps_.
push_back
(
std::make_pair
(step,
time_duration
()));
}
void
PerformanceTimer::stop
()
{
BOOST_ASSERT
(
running
());
//
if there is an existing step pending then record its duration
recordPendingStep
();
//
reset start time
startTime_ =
ptime
(not_a_date_time);
}
bool
PerformanceTimer::running
()
const
{
return
!startTime_.
is_not_a_date_time
();
}
void
PerformanceTimer::recordPendingStep
()
{
if
(!steps_.
empty
())
steps_.
back
().
second
=
now
() - startTime_;
}
boost::posix_time::ptime
PerformanceTimer::now
()
const
{
return
microsec_clock::universal_time
();
}
std::ostream&
operator
<< (std::ostream& os,
const
PerformanceTimer& t)
{
BOOST_ASSERT
(!t.
running
());
//
fixed width output
std::ios::fmtflags oldFlags = os.
setf
(std::ios::fixed);
os <<
"
PERFORMANCE
"
;
//
start on a new line if we have more than one step
if
(t.
steps_
.
size
() >
1
)
os << std::endl;
for
(PerformanceTimer::Steps::const_iterator
it = t.
steps_
.
begin
(); it != t.
steps_
.
end
(); ++it)
{
double
ms = it->
second
.
total_microseconds
() *
0.001
;
os <<
std::setprecision
(ms <
10
?
1
:
0
);
os <<
"
"
<< ms <<
"
ms (
"
<< it->
first
<<
"
)
"
<< std::endl;
}
//
restore old output flags
os.
setf
(oldFlags);
return
os;
}
}
//
namespace core
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