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// Copyright 2017 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "starboard/common/flat_map.h"
#include <map>
#include <sstream>
#include <string>
#include "starboard/thread.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace starboard {
namespace nplb {
namespace {
bool StringPairEquals(const std::pair<std::string, std::string>& a,
const std::pair<std::string, std::string>& b) {
return (a.first == b.first) && (a.second == b.second);
}
bool FlipCoin() {
return (std::rand() % 2) == 1;
}
int Random(int first_includsive, int end_exclusive) {
size_t range = static_cast<size_t>(end_exclusive - first_includsive);
size_t r = rand() % range;
return static_cast<int>(r) + first_includsive;
}
template <typename MapA_Type, typename MapB_Type>
bool CheckMapEquality(const MapA_Type& map_a, const MapB_Type& map_b) {
typedef typename MapA_Type::const_iterator map_a_iterator;
typedef typename MapB_Type::const_iterator map_b_iterator;
if (map_a.size() != map_b.size()) {
typedef typename MapA_Type::key_type key_type;
std::vector<key_type> vector_a;
std::vector<key_type> vector_b;
for (map_a_iterator it = map_a.begin(); it != map_a.end(); ++it) {
vector_a.push_back(it->first);
}
for (map_b_iterator it = map_b.begin(); it != map_b.end(); ++it) {
vector_b.push_back(it->first);
}
std::vector<key_type> diff_vector;
std::set_symmetric_difference(vector_a.begin(), vector_a.end(),
vector_b.begin(), vector_b.end(),
std::back_inserter(diff_vector));
for (int i = 0; i < diff_vector.size(); ++i) {
EXPECT_TRUE(false) << "Mismatched key: " << diff_vector[i] << "\n";
}
return false;
}
map_a_iterator map_a_it = map_a.begin();
map_b_iterator map_b_it = map_b.begin();
bool ok = true;
while (map_a_it != map_a.end()) {
ok &= (map_a_it->first == map_b_it->first);
ok &= (map_a_it->second == map_b_it->second);
EXPECT_EQ(map_a_it->first, map_b_it->first);
EXPECT_EQ(map_a_it->second, map_b_it->second);
++map_a_it;
++map_b_it;
}
return ok;
}
SbTimeMonotonic GetThreadTimeMonotonicNow() {
#if SB_API_VERSION >= 3 && SB_HAS(TIME_THREAD_NOW)
return SbTimeGetMonotonicThreadNow();
#else
return SbTimeGetMonotonicNow();
#endif
}
// Generic stringification of the input map type. This allows good error
// messages to be printed out.
template <typename MapType>
std::string MapToString(const MapType& map) {
typedef typename MapType::const_iterator const_iterator;
std::stringstream ss;
for (const_iterator it = map.begin(); it != map.end(); ++it) {
ss << "{" << it->first << "," << it->second << "},\n";
}
return ss.str();
}
// Tests FlatMap<int, int> by shadowing operations to an std::map<int, int>
// and checking for equality at every step of the way. This allows "fuzzing"
// the container and checking that it's operation match those from a known
// container.
struct MapTester {
typedef std::map<int, int>::const_iterator std_map_iterator;
typedef FlatMap<int, int>::const_iterator flat_map_iterator;
bool CheckEquality() { return CheckMapEquality(std_map, flat_map); }
void Insert(int key, int value) {
typedef std::pair<std_map_iterator, bool> StdMapPair;
typedef std::pair<flat_map_iterator, bool> FlatMapPair;
StdMapPair pair_a = std_map.insert(std::make_pair(key, value));
FlatMapPair pair_b = flat_map.insert(std::make_pair(key, value));
ASSERT_EQ(pair_a.second, pair_b.second)
<< "Insertion states are mismatched.";
ASSERT_EQ(pair_a.first->first, pair_b.first->first)
<< "Inserted keys have a mismatch.";
ASSERT_EQ(pair_a.first->second, pair_b.first->second)
<< "Inserted values have a mismatch.";
CheckEquality();
}
void BulkInsert(const std::vector<std::pair<int, int> >& values) {
std::map<int, int> old_std_map = std_map;
FlatMap<int, int> old_flat_map = flat_map;
std_map.insert(values.begin(), values.end());
flat_map.insert(values.begin(), values.end());
if (!CheckEquality()) {
// Failed so print out something interesting.
std::string str_old_std_map = MapToString(old_std_map);
std::string str_std_map = MapToString(std_map);
std::string str_values = MapToString(values);
std::string str_flat_map = MapToString(flat_map);
std::stringstream ss;
ss << "Original Map:\n" << str_old_std_map << "\n\n";
ss << "Bulk insert values:\n" << str_values << "\n\n";
ss << "Resulting map:\n" << str_flat_map << "\n\n";
ss << "But should have been:\n" << str_std_map << "\n\n";
SbLogRaw(ss.str().c_str());
}
}
void Erase(int key) {
std_map.erase(key);
flat_map.erase(key);
CheckEquality();
}
void BulkErase(const std::vector<int>& values) {
for (size_t i = 0; i < values.size(); ++i) {
std_map.erase(values[i]);
flat_map.erase(values[i]);
}
CheckEquality();
}
void Clear() {
std_map.clear();
flat_map.clear();
CheckEquality();
}
static int RandomKey() { return Random(0, 100); }
static int RandomValue() { return Random(0, 10000); }
std::map<int, int> std_map;
FlatMap<int, int> flat_map;
};
} // namespace.
////////////////////////////// UNIT TESTS /////////////////////////////////////
TEST(FlatMap, BasicUse) {
FlatMap<int, int> int_map;
int_map[4] = 3;
int_map[3] = 4;
EXPECT_EQ(2, int_map.size());
EXPECT_EQ(3, int_map[4]);
EXPECT_EQ(4, int_map[3]);
int_map.erase(3);
EXPECT_EQ(int_map[4], 3);
}
// Tests that a string map correctly can be used with this flat map.
TEST(FlatMap, StringMap) {
FlatMap<std::string, std::string> string_map;
string_map["one"] = "value-one";
string_map["two"] = "value-two";
string_map["three"] = "value-three";
string_map["four"] = "value-four";
string_map["five"] = "value-five";
EXPECT_EQ(std::string("value-one"), string_map["one"]);
EXPECT_EQ(std::string("value-two"), string_map["two"]);
EXPECT_EQ(std::string("value-three"), string_map["three"]);
EXPECT_EQ(std::string("value-four"), string_map["four"]);
EXPECT_EQ(std::string("value-five"), string_map["five"]);
}
struct CustomKey {
CustomKey() : value(0) {}
explicit CustomKey(int v) : value(v) {}
int value;
// Auto-binds to std::less, which is the default comparator of FlatMap
// as well as
bool operator<(const CustomKey& other) const { return value < other.value; }
};
TEST(FlatMap, CustomKeyType) {
FlatMap<CustomKey, int> custom_map;
custom_map[CustomKey(3)] = 1234;
EXPECT_EQ(1234, custom_map[CustomKey(3)]);
}
TEST(FlatMap, size) {
FlatMap<std::string, std::string> flat_map;
EXPECT_EQ(0, flat_map.size());
flat_map["one"] = "one-value";
EXPECT_EQ(1, flat_map.size());
}
TEST(FlatMap, empty) {
FlatMap<std::string, std::string> flat_map;
EXPECT_TRUE(flat_map.empty());
flat_map["one"] = "one-value";
EXPECT_FALSE(flat_map.empty());
}
TEST(FlatMap, clear) {
FlatMap<std::string, std::string> flat_map;
flat_map["one"] = "one-value";
flat_map.clear();
EXPECT_TRUE(flat_map.empty());
}
TEST(FlatMap, find) {
FlatMap<std::string, std::string> flat_map;
flat_map["one"] = "value-one";
flat_map["two"] = "value-two";
flat_map["three"] = "value-three";
flat_map["four"] = "value-four";
flat_map["five"] = "value-five";
EXPECT_EQ(std::string("value-one"), flat_map["one"]);
EXPECT_EQ(std::string("value-two"), flat_map["two"]);
EXPECT_EQ(std::string("value-three"), flat_map["three"]);
EXPECT_EQ(std::string("value-four"), flat_map["four"]);
EXPECT_EQ(std::string("value-five"), flat_map["five"]);
FlatMap<std::string, std::string>::const_iterator found_it =
flat_map.find("three");
ASSERT_NE(found_it, flat_map.end());
ASSERT_EQ(std::string("three"), found_it->first);
ASSERT_EQ(std::string("value-three"), found_it->second);
found_it = flat_map.find("twenty");
ASSERT_EQ(found_it, flat_map.end());
}
TEST(FlatMap, swap) {
FlatMap<int, int> map;
map[1] = -1;
FlatMap<int, int> other_map;
map.swap(other_map);
EXPECT_TRUE(map.empty());
EXPECT_EQ(1, other_map.size());
EXPECT_EQ(-1, other_map[1]);
}
TEST(FlatMap, DefaultAssignmentArrayOperator) {
FlatMap<int, int> map;
EXPECT_EQ(0, map[1]); // key [1] doesn't exist, so should default to 0.
}
TEST(FlatMap, lower_bound) {
FlatMap<int, int> map;
map[1] = 1;
map[3] = 3;
map[4] = 4;
FlatMap<int, int>::const_iterator lower_it = map.lower_bound(2);
ASSERT_TRUE(lower_it != map.end());
EXPECT_EQ(lower_it->first, 3);
lower_it = map.lower_bound(3);
ASSERT_TRUE(lower_it != map.end());
EXPECT_EQ(lower_it->first, 3);
}
TEST(FlatMap, upper_bound) {
FlatMap<int, int> map;
map[1] = 1;
map[3] = 3;
map[4] = 4;
FlatMap<int, int>::const_iterator upper_it = map.upper_bound(2);
ASSERT_TRUE(upper_it != map.end());
EXPECT_EQ(upper_it->first, 3);
upper_it = map.upper_bound(3);
ASSERT_TRUE(upper_it != map.end());
EXPECT_EQ(upper_it->first, 4); // 4 is the next one greater than 3.
}
TEST(FlatMap, equal_range) {
FlatMap<int, int> map;
typedef FlatMap<int, int>::iterator iterator;
map[1] = 1;
map[3] = 3;
map[4] = 4;
// Should not find this.
std::pair<iterator, iterator> range = map.equal_range(2);
ASSERT_EQ(range.first, map.end());
ASSERT_EQ(range.second, map.end());
// Should find the value.
range = map.equal_range(3);
ASSERT_EQ(range.first, map.begin() + 1);
ASSERT_EQ(range.second, map.begin() + 2); // exclusive
}
TEST(FlatMap, count) {
FlatMap<int, int> map;
typedef FlatMap<int, int>::iterator iterator;
map[1] = 1;
EXPECT_EQ(1, map.count(1));
EXPECT_EQ(0, map.count(4)); // We don't expect this to be found.
}
TEST(FlatMap, OperatorEquals) {
FlatMap<int, int> map_a;
FlatMap<int, int> map_b;
map_a[1] = 1;
map_b[1] = 1;
EXPECT_EQ(map_a, map_b);
map_b[1] = -1;
EXPECT_NE(map_a, map_b);
map_b[1] = 1;
EXPECT_EQ(map_a, map_b); // Expect equal again.
map_b[2] = 1;
EXPECT_NE(map_a, map_b);
}
TEST(FlatMap, Insert) {
FlatMap<int, int> int_map;
EXPECT_TRUE(int_map.empty());
EXPECT_EQ(0, int_map.size());
int_map.insert(std::make_pair(1, 10));
EXPECT_FALSE(int_map.empty());
EXPECT_EQ(1, int_map.size());
FlatMap<int, int>::iterator found = int_map.find(1);
EXPECT_EQ(10, found->second);
std::pair<FlatMap<int, int>::iterator, bool> insert_result =
int_map.insert(std::make_pair(1, 10));
EXPECT_FALSE(insert_result.second) << "Insert should have been rejected.";
EXPECT_EQ(insert_result.first, int_map.begin());
insert_result = int_map.insert(std::make_pair(0, -10));
EXPECT_TRUE(insert_result.second) << "Insert should have been succeed.";
// The new beginning contains the new value.
EXPECT_EQ(insert_result.first, int_map.begin());
}
TEST(FlatMap, BulkInsertZero) {
FlatMap<std::string, std::string> flat_string_map;
flat_string_map["one"] = "value-one";
flat_string_map["two"] = "value-two";
flat_string_map["three"] = "value-three";
flat_string_map["four"] = "value-four";
flat_string_map["five"] = "value-five";
std::map<std::string, std::string> string_map; // empty.
const size_t num_inserted =
flat_string_map.insert(string_map.begin(), string_map.end());
ASSERT_EQ(0, num_inserted);
EXPECT_EQ(5, flat_string_map.size());
// According to the sort invariant, "five" is the lowest value key and
// therefore should be the first element found in the map.
EXPECT_EQ(std::string("value-five"), flat_string_map.begin()->second);
}
TEST(FlatMap, BulkInsertOne) {
FlatMap<std::string, std::string> flat_string_map;
// Reference map verifies for correct behavior.
std::map<std::string, std::string> reference_map;
flat_string_map["one"] = "value-one";
flat_string_map["two"] = "value-two";
flat_string_map["three"] = "value-three";
flat_string_map["four"] = "value-four";
flat_string_map["five"] = "value-five";
reference_map["one"] = "value-one";
reference_map["two"] = "value-two";
reference_map["three"] = "value-three";
reference_map["four"] = "value-four";
reference_map["five"] = "value-five";
std::map<std::string, std::string> string_map; // empty.
string_map["six"] = "value-six";
const size_t num_inserted =
flat_string_map.insert(string_map.begin(), string_map.end());
reference_map.insert(string_map.begin(), string_map.end());
ASSERT_EQ(1, num_inserted); // "six" = "value-six" was inserted.
EXPECT_EQ(std::string("value-six"), flat_string_map["six"]);
CheckMapEquality(flat_string_map, reference_map);
}
TEST(FlatMap, BulkInsertDuplicate) {
FlatMap<int, int> flat_int_map;
flat_int_map[1] = 1;
std::vector<std::pair<int, int> > bulk_entries;
bulk_entries.push_back(std::pair<int, int>(1, -1));
flat_int_map.insert(bulk_entries.begin(), bulk_entries.end());
// Expect that resetting the key [1] => -1 failed because the key already
// existed.
EXPECT_EQ(1, flat_int_map[1]);
}
TEST(FlatMap, BulkInsert) {
std::map<std::string, std::string> string_map;
string_map["one"] = "value-one";
string_map["two"] = "value-two";
string_map["three"] = "value-three";
string_map["four"] = "value-four";
string_map["five"] = "value-five";
FlatMap<std::string, std::string> flat_string_map;
// Reference map verifies for correct behavior.
std::map<std::string, std::string> reference_map;
flat_string_map.insert(string_map.begin(), string_map.end());
reference_map.insert(string_map.begin(), string_map.end());
ASSERT_EQ(flat_string_map.size(), string_map.size());
ASSERT_EQ(reference_map.size(), string_map.size());
bool is_equal_range = std::equal(string_map.begin(), string_map.end(),
flat_string_map.begin(), StringPairEquals);
// Now insert again.
size_t num_inserted =
flat_string_map.insert(string_map.begin(), string_map.end());
EXPECT_EQ(0, num_inserted)
<< "No elements should be inserted because they all preexist.";
reference_map.insert(string_map.begin(), string_map.end());
// No change in map size.
ASSERT_EQ(flat_string_map.size(), string_map.size());
is_equal_range = std::equal(string_map.begin(), string_map.end(),
flat_string_map.begin(), StringPairEquals);
EXPECT_TRUE(is_equal_range);
CheckMapEquality(flat_string_map, reference_map);
}
TEST(FlatMap, UnsortedInsertWithDuplicates) {
typedef std::pair<std::string, std::string> StringPair;
std::vector<StringPair> vector;
vector.push_back(StringPair("one", "value-one"));
vector.push_back(StringPair("one", "value-one")); // Duplicate
vector.push_back(StringPair("three", "value-three"));
vector.push_back(StringPair("four", "value-four"));
vector.push_back(StringPair("five", "value-five"));
FlatMap<std::string, std::string> flat_string_map;
flat_string_map.insert(vector.begin(), vector.end());
// Asserts that the duplicate with key "one" was removed.
ASSERT_EQ(4, flat_string_map.size());
std::map<std::string, std::string> string_map;
string_map["one"] = "value-one";
string_map["two"] = "value-two";
string_map["three"] = "value-three";
string_map["four"] = "value-four";
string_map["five"] = "value-five";
const size_t num_inserted =
flat_string_map.insert(string_map.begin(), string_map.end());
ASSERT_EQ(1, num_inserted) << "Only one element should have been inserted.";
bool is_equal_range = std::equal(string_map.begin(), string_map.end(),
flat_string_map.begin(), StringPairEquals);
ASSERT_TRUE(is_equal_range);
}
TEST(FlatMap, FlatMapDetail_IsPod) {
EXPECT_TRUE(flat_map_detail::IsPod<bool>::value);
EXPECT_TRUE(flat_map_detail::IsPod<float>::value);
EXPECT_TRUE(flat_map_detail::IsPod<int8_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<uint8_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<int16_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<uint16_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<int32_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<uint32_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<int64_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<uint64_t>::value);
EXPECT_TRUE(flat_map_detail::IsPod<CustomKey*>::value);
EXPECT_FALSE(flat_map_detail::IsPod<std::string>::value);
EXPECT_FALSE(flat_map_detail::IsPod<std::vector<int> >::value);
}
////////////////////////////// PERFORMANCE TEST ///////////////////////////////
std::vector<int> GenerateRandomIntVector(size_t size_vector,
int min_random,
int max_random) {
std::vector<int> output;
for (size_t i = 0; i < size_vector; ++i) {
output.push_back(Random(min_random, max_random));
}
return output;
}
std::vector<std::pair<int, int> > GenerateRandomIntPairVector(
size_t size_vector,
int min_random,
int max_random) {
std::vector<std::pair<int, int> > output;
for (size_t i = 0; i < size_vector; ++i) {
std::pair<int, int> entry(Random(min_random, max_random),
Random(min_random, max_random));
output.push_back(entry);
}
return output;
}
template <typename MapIntType> // FlatMap<int, int> or std::map<int, int>
SbTime PerfTestFind(const MapIntType& map,
const std::vector<int>& search_queries_data,
size_t query_count) {
SbThreadYield(); // Stabilizes time
SbTime start_time = GetThreadTimeMonotonicNow();
size_t index = 0;
const size_t n = search_queries_data.size();
for (size_t i = 0; i < query_count; ++i) {
if (index == n) {
index = 0;
}
map.find(search_queries_data[index]);
++index;
}
SbTime delta_time = GetThreadTimeMonotonicNow() - start_time;
return delta_time;
}
TEST(FlatMap, PerformanceTestFind) {
std::vector<size_t> test_sizes;
test_sizes.push_back(5);
test_sizes.push_back(10);
test_sizes.push_back(25);
test_sizes.push_back(50);
test_sizes.push_back(100);
test_sizes.push_back(1000);
test_sizes.push_back(10000);
test_sizes.push_back(100000);
std::vector<std::pair<int, int> > insert_data;
const std::vector<int> query_data =
GenerateRandomIntVector(1000, // Number of elements.
0, // Min random value.
100000); // Max random value.
static const size_t kNumberOfQueries = 10000;
std::vector<double> speedup_results;
for (size_t i = 0; i < test_sizes.size(); ++i) {
const size_t test_size = test_sizes[i];
insert_data = GenerateRandomIntPairVector(test_size, 0, 100000);
FlatMap<int, int> flat_int_map(insert_data.begin(), insert_data.end());
std::map<int, int> std_int_map(insert_data.begin(), insert_data.end());
SbTime time_flat_int_map =
PerfTestFind(flat_int_map, query_data, kNumberOfQueries);
SbTime time_std_int_map =
PerfTestFind(std_int_map, query_data, kNumberOfQueries);
double flat_map_speedup = static_cast<double>(time_std_int_map) /
static_cast<double>(time_flat_int_map);
speedup_results.push_back(flat_map_speedup);
}
std::stringstream ss;
ss << "\n";
ss << "FlatMap<int,int>::find() Performance\n"
<< "NUMBER OF ELEMENTS | SPEED COMPARSION vs std::map\n"
<< "-------------------------------------\n";
for (size_t i = 0; i < test_sizes.size(); ++i) {
size_t test_size = test_sizes[i];
double speedup = speedup_results[i];
ss.width(18);
ss << std::right << test_size << " | ";
ss << std::left << (speedup * 100.0) << "%\n";
}
ss << "\n";
SbLogRaw(ss.str().c_str());
}
///////////////////////////////// FUZZER TEST /////////////////////////////////
// A stochastic test which randomly does insertions and erases and makes sure
// that the two data structures are equal at every step of the way.
TEST(FlatMap, FuzzerTest) {
static const size_t kNumTestIterations = 1000;
MapTester map_tester;
// Seed the random number generator so that any failures are reproducible
// between runs.
std::srand(0);
for (size_t test_loop = 0; test_loop < kNumTestIterations; ++test_loop) {
const size_t random_1_to_100 = 1 + (std::rand() % 100);
if (random_1_to_100 > 98) { // 2% - chance
// do clear.
map_tester.Clear();
} else if (random_1_to_100 > 48) { // 50% chance
// Do insert.
if (FlipCoin()) {
// Insert one element.
int key = MapTester::RandomKey();
int value = MapTester::RandomValue();
map_tester.Insert(key, value);
} else {
// Bulk insert
const size_t num_values = Random(0, 20);
std::vector<std::pair<int, int> > values;
for (size_t i = 0; i < num_values; ++i) {
int key = MapTester::RandomKey();
int value = MapTester::RandomValue();
values.push_back(std::make_pair(key, value));
}
map_tester.BulkInsert(values);
}
} else {
// Do erase.
if (FlipCoin()) {
// Erase one element.
int key = Random(0, 100);
map_tester.Erase(key);
} else {
// Erase bulk elements.
const size_t num_values = Random(0, 20);
std::vector<int> values;
for (size_t i = 0; i < num_values; ++i) {
int key = Random(0, 100);
values.push_back(key);
}
map_tester.BulkErase(values);
}
}
// Now check to make sure maps are still equal.
map_tester.CheckEquality();
}
}
} // namespace nplb
} // namespace starboard