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// Copyright (c) 2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/disk_cache/stats_histogram.h"
#include "base/logging.h"
#include "net/disk_cache/stats.h"
namespace disk_cache {
using base::Histogram;
using base::StatisticsRecorder;
// Static.
const Stats* StatsHistogram::stats_ = NULL;
StatsHistogram::~StatsHistogram() {
// Only cleanup what we set.
if (init_)
stats_ = NULL;
}
scoped_refptr<StatsHistogram> StatsHistogram::StatsHistogramFactoryGet(
const std::string& name) {
scoped_refptr<Histogram> histogram(NULL);
Sample minimum = 1;
Sample maximum = disk_cache::Stats::kDataSizesLength - 1;
size_t bucket_count = disk_cache::Stats::kDataSizesLength;
if (StatisticsRecorder::FindHistogram(name, &histogram)) {
DCHECK(histogram.get() != NULL);
} else {
StatsHistogram* stats_histogram = new StatsHistogram(name, minimum, maximum,
bucket_count);
stats_histogram->InitializeBucketRange();
histogram = stats_histogram;
StatisticsRecorder::Register(&histogram);
}
DCHECK(HISTOGRAM == histogram->histogram_type());
DCHECK(histogram->HasConstructorArguments(minimum, maximum, bucket_count));
// We're preparing for an otherwise unsafe upcast by ensuring we have the
// proper class type.
Histogram* temp_histogram = histogram.get();
StatsHistogram* temp_stats_histogram =
static_cast<StatsHistogram*>(temp_histogram);
// Validate upcast by seeing that we're probably providing the checksum.
CHECK_EQ(temp_stats_histogram->StatsHistogram::CalculateRangeChecksum(),
temp_stats_histogram->CalculateRangeChecksum());
scoped_refptr<StatsHistogram> return_histogram(temp_stats_histogram);
return return_histogram;
}
bool StatsHistogram::Init(const Stats* stats) {
DCHECK(stats);
if (stats_)
return false;
SetFlags(kUmaTargetedHistogramFlag);
// We support statistics report for only one cache.
init_ = true;
stats_ = stats;
return true;
}
Histogram::Sample StatsHistogram::ranges(size_t i) const {
DCHECK(stats_);
return stats_->GetBucketRange(i);
}
size_t StatsHistogram::bucket_count() const {
return disk_cache::Stats::kDataSizesLength;
}
void StatsHistogram::SnapshotSample(SampleSet* sample) const {
DCHECK(stats_);
StatsSamples my_sample;
stats_->Snapshot(&my_sample);
*sample = my_sample;
// Only report UMA data once.
StatsHistogram* mutable_me = const_cast<StatsHistogram*>(this);
mutable_me->ClearFlags(kUmaTargetedHistogramFlag);
}
Histogram::Inconsistencies StatsHistogram::FindCorruption(
const SampleSet& snapshot) const {
return NO_INCONSISTENCIES; // This class won't monitor inconsistencies.
}
uint32 StatsHistogram::CalculateRangeChecksum() const {
// We don't calculate checksums, so at least establish a unique constant.
const uint32 kStatsHistogramChecksum = 0x0cecce;
return kStatsHistogramChecksum;
}
} // namespace disk_cache
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