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// Copyright 2017 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 "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "base/memory/ptr_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/time.h"
#include "base/values.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/perf/perf_result_reporter.h"
namespace base {
namespace {
constexpr char kMetricPrefixJSON[] = "JSON.";
constexpr char kMetricReadTime[] = "read_time";
constexpr char kMetricWriteTime[] = "write_time";
perf_test::PerfResultReporter SetUpReporter(const std::string& story_name) {
perf_test::PerfResultReporter reporter(kMetricPrefixJSON, story_name);
reporter.RegisterImportantMetric(kMetricReadTime, "ms");
reporter.RegisterImportantMetric(kMetricWriteTime, "ms");
return reporter;
}
// Generates a simple dictionary value with simple data types, a string and a
// list.
Value GenerateDict() {
Value root(Value::Type::DICTIONARY);
root.SetDoubleKey("Double", 3.141);
root.SetBoolKey("Bool", true);
root.SetIntKey("Int", 42);
root.SetStringKey("String", "Foo");
Value::ListStorage list;
list.push_back(Value(2.718));
list.push_back(Value(false));
list.push_back(Value(123));
list.push_back(Value("Bar"));
root.SetKey("List", Value(std::move(list)));
return root;
}
// Generates a tree-like dictionary value with a size of O(breadth ** depth).
Value GenerateLayeredDict(int breadth, int depth) {
if (depth == 1)
return GenerateDict();
Value root = GenerateDict();
Value next = GenerateLayeredDict(breadth, depth - 1);
for (int i = 0; i < breadth; ++i) {
root.SetKey("Dict" + base::NumberToString(i), next.Clone());
}
return root;
}
} // namespace
class JSONPerfTest : public testing::Test {
public:
void TestWriteAndRead(int breadth, int depth) {
std::string description = "Breadth: " + base::NumberToString(breadth) +
", Depth: " + base::NumberToString(depth);
Value dict = GenerateLayeredDict(breadth, depth);
std::string json;
TimeTicks start_write = TimeTicks::Now();
JSONWriter::Write(dict, &json);
TimeTicks end_write = TimeTicks::Now();
auto reporter = SetUpReporter("breadth_" + base::NumberToString(breadth) +
"_depth_" + base::NumberToString(depth));
reporter.AddResult(kMetricWriteTime, end_write - start_write);
TimeTicks start_read = TimeTicks::Now();
JSONReader::Read(json);
TimeTicks end_read = TimeTicks::Now();
reporter.AddResult(kMetricReadTime, end_read - start_read);
}
};
TEST_F(JSONPerfTest, StressTest) {
// These loop ranges are chosen such that this test will complete in a
// reasonable amount of time and will work on a 32-bit build without hitting
// an out-of-memory failure. Having j go to 10 uses over 2 GiB of memory and
// might hit Android timeouts so be wary of going that high.
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 10; ++j) {
TestWriteAndRead(i + 1, j + 1);
}
}
}
} // namespace base
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