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Bug 723846 - Part 1: add FlagHistogram to ipc. r=taras

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This commit is contained in:
Nathan Froyd 2012-03-01 15:03:11 -05:00
parent 9299a0663c
commit 2cbd8085c0
2 changed files with 67 additions and 1 deletions
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46
ipc/chromium/src/base/histogram.cc
View File

@ -916,6 +916,52 @@ BooleanHistogram::BooleanHistogram(const std::string& name)
: LinearHistogram(name, 1, 2, 3) {
}
//------------------------------------------------------------------------------
// FlagHistogram:
//------------------------------------------------------------------------------
Histogram *
FlagHistogram::FactoryGet(const std::string &name, Flags flags)
{
Histogram *h(nsnull);
if (!StatisticsRecorder::FindHistogram(name, &h)) {
// To avoid racy destruction at shutdown, the following will be leaked.
FlagHistogram *fh = new FlagHistogram(name);
fh->InitializeBucketRange();
fh->SetFlags(flags);
size_t zero_index = fh->BucketIndex(0);
fh->Histogram::Accumulate(1, 1, zero_index);
h = StatisticsRecorder::RegisterOrDeleteDuplicate(fh);
}
return h;
}
FlagHistogram::FlagHistogram(const std::string &name)
: BooleanHistogram(name), mSwitched(false) {
}
Histogram::ClassType
FlagHistogram::histogram_type() const
{
return FLAG_HISTOGRAM;
}
void
FlagHistogram::Accumulate(Sample value, Count count, size_t index)
{
if (mSwitched) {
return;
}
mSwitched = true;
DCHECK_EQ(value, 1);
Histogram::Accumulate(value, 1, index);
size_t zero_index = BucketIndex(0);
Histogram::Accumulate(1, -1, zero_index);
}
//------------------------------------------------------------------------------
// CustomHistogram:
//------------------------------------------------------------------------------

22
ipc/chromium/src/base/histogram.h
View File

@ -276,6 +276,7 @@ class Histogram {
HISTOGRAM,
LINEAR_HISTOGRAM,
BOOLEAN_HISTOGRAM,
FLAG_HISTOGRAM,
CUSTOM_HISTOGRAM,
NOT_VALID_IN_RENDERER
};
@ -642,7 +643,7 @@ class BooleanHistogram : public LinearHistogram {
virtual void AddBoolean(bool value);
private:
protected:
explicit BooleanHistogram(const std::string& name);
DISALLOW_COPY_AND_ASSIGN(BooleanHistogram);
@ -650,6 +651,25 @@ class BooleanHistogram : public LinearHistogram {
//------------------------------------------------------------------------------
// FlagHistogram is like boolean histogram, but only allows a single off/on value.
class FlagHistogram : public BooleanHistogram
{
public:
static Histogram *FactoryGet(const std::string &name, Flags flags);
virtual ClassType histogram_type() const;
virtual void Accumulate(Sample value, Count count, size_t index);
private:
explicit FlagHistogram(const std::string &name);
bool mSwitched;
DISALLOW_COPY_AND_ASSIGN(FlagHistogram);
};
//------------------------------------------------------------------------------
// CustomHistogram is a histogram for a set of custom integers.
class CustomHistogram : public Histogram {
public: