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#include "cache.h"
#include <library/cpp/testing/unittest/registar.h>
#include <library/cpp/time_provider/monotonic_provider.h>
#include <util/random/random.h>
#include <util/thread/pool.h>
using namespace NSQLComplete;
class TPausedClock: public NMonotonic::IMonotonicTimeProvider {
public:
NMonotonic::TMonotonic Now() override {
return Now_;
}
void Skip(TDuration duration) {
Now_ += duration;
}
private:
NMonotonic::TMonotonic Now_ = NMonotonic::CreateDefaultMonotonicTimeProvider()->Now();
};
struct TFat {
size_t Id = 0;
friend bool operator==(const TFat& lhs, const TFat& rhs) = default;
};
namespace NSQLComplete {
template <>
struct TByteSize<TFat> {
size_t operator()(const TFat&) const noexcept {
return 10'000;
}
};
} // namespace NSQLComplete
template <>
struct THash<TFat> {
size_t operator()(const TFat& x) const noexcept {
return x.Id;
}
};
struct TAction {
bool IsGet = false;
TString Key = "";
TString Value = "";
};
TVector<TAction> GenerateRandomActions(size_t size) {
constexpr double GetFrequency = 0.75;
constexpr ui32 MaxKey = 100;
constexpr ui32 MinValue = 1;
constexpr ui32 MaxValue = 10;
TVector<TAction> actions(size);
for (auto& action : actions) {
action.IsGet = RandomNumber<double>() < GetFrequency;
action.Key = ToString(RandomNumber(MaxKey));
action.Value = ToString(MinValue + RandomNumber(MaxValue - MinValue));
}
return actions;
}
TIntrusivePtr<TPausedClock> MakePausedClock() {
return new TPausedClock();
}
Y_UNIT_TEST_SUITE(LocalCacheTests) {
Y_UNIT_TEST(OnEmpty_WhenGet_ThenReturnedExpiredDefault) {
auto cache = MakeLocalCache<TString, TString>(
NMonotonic::CreateDefaultMonotonicTimeProvider(), {});
auto entry = cache->Get("1").GetValueSync();
UNIT_ASSERT_VALUES_EQUAL(entry.Value, Nothing());
UNIT_ASSERT_VALUES_EQUAL(entry.IsExpired, true);
}
Y_UNIT_TEST(OnEmpty_WhenUpdate_ThenReturnedNew) {
auto cache = MakeLocalCache<TString, TString>(
NMonotonic::CreateDefaultMonotonicTimeProvider(), {});
cache->Update("1", "1").GetValueSync();
auto entry = cache->Get("1").GetValueSync();
UNIT_ASSERT_VALUES_EQUAL(entry.Value, "1");
UNIT_ASSERT_VALUES_EQUAL(entry.IsExpired, false);
}
Y_UNIT_TEST(OnExistingKey_WhenUpdate_ThenReturnedNew) {
auto cache = MakeLocalCache<TString, TString>(
NMonotonic::CreateDefaultMonotonicTimeProvider(), {});
cache->Update("1", "1");
cache->Update("1", "2").GetValueSync();
auto entry = cache->Get("1").GetValueSync();
UNIT_ASSERT_VALUES_EQUAL(entry.Value, "2");
UNIT_ASSERT_VALUES_EQUAL(entry.IsExpired, false);
}
Y_UNIT_TEST(OnExistingKey_WhenExpires_ThenReturnedOld) {
auto clock = MakePausedClock();
auto cache = MakeLocalCache<TString, TString>(clock, {.TTL = TDuration::Minutes(2)});
cache->Update("1", "1");
clock->Skip(TDuration::Minutes(2) + TDuration::Seconds(1));
auto entry = cache->Get("1").GetValueSync();
UNIT_ASSERT_VALUES_EQUAL(entry.Value, "1");
UNIT_ASSERT_VALUES_EQUAL(entry.IsExpired, true);
}
Y_UNIT_TEST(OnExistingKey_WhenGetResultExtracted_ThenItIsCopied) {
auto cache = MakeLocalCache<TString, TString>(
NMonotonic::CreateDefaultMonotonicTimeProvider(), {});
cache->Update("1", TString(128, '1'));
cache->Get("1").ExtractValueSync();
UNIT_ASSERT_VALUES_EQUAL(cache->Get("1").ExtractValueSync().Value, TString(128, '1'));
UNIT_ASSERT_VALUES_EQUAL(cache->Get("1").ExtractValueSync().Value, TString(128, '1'));
}
Y_UNIT_TEST(OnFull_WhenFatAdded_ThenSomeKeyIsEvicted) {
const size_t Overhead = TByteSize<TFat>()({}) / 10;
auto cache = MakeLocalCache<int, TFat>(
NMonotonic::CreateDefaultMonotonicTimeProvider(),
{.ByteCapacity = 4 * TByteSize<TFat>()({}) + Overhead});
cache->Update(1, {});
cache->Update(2, {});
cache->Update(3, {});
cache->Update(4, {});
cache->Update(5, {});
size_t evicted = 0;
for (auto x : {1, 2, 3, 4, 5}) {
if (cache->Get(x).GetValueSync().IsExpired) {
evicted += 1;
}
}
UNIT_ASSERT_VALUES_EQUAL(evicted, 1);
}
Y_UNIT_TEST(OnFull_WhenFatAdded_ThenKeyAndOverheadAreAccounted) {
const size_t Overhead = TByteSize<TFat>()({}) / 10;
auto cache = MakeLocalCache<TFat, TFat>(
NMonotonic::CreateDefaultMonotonicTimeProvider(),
{.ByteCapacity = 3 * 4 * TByteSize<TFat>()({}) + Overhead});
cache->Update(TFat{1}, {});
cache->Update(TFat{2}, {});
cache->Update(TFat{3}, {});
cache->Update(TFat{4}, {});
cache->Update(TFat{5}, {});
size_t evicted = 0;
for (auto x : {TFat{1}, TFat{2}, TFat{3}, TFat{4}, TFat{5}}) {
if (cache->Get(x).GetValueSync().IsExpired) {
evicted += 1;
}
}
UNIT_ASSERT_VALUES_EQUAL(evicted, 1);
}
Y_UNIT_TEST(WhenRandomlyAccessed_ThenDoesNotDie) {
constexpr size_t Iterations = 1024 * 1024;
SetRandomSeed(1);
auto cache = MakeLocalCache<TString, TString>(
NMonotonic::CreateDefaultMonotonicTimeProvider(), {.ByteCapacity = 64, .TTL = TDuration::MilliSeconds(1)});
for (auto&& a : GenerateRandomActions(Iterations)) {
if (a.IsGet) {
Y_DO_NOT_OPTIMIZE_AWAY(cache->Get(a.Key));
} else {
Y_DO_NOT_OPTIMIZE_AWAY(cache->Update(a.Key, std::move(a.Value)));
}
}
}
Y_UNIT_TEST(WhenConcurrentlyAccessed_ThenDoesNotDie) {
constexpr size_t Threads = 8;
constexpr size_t Iterations = Threads * 16 * 1024;
SetRandomSeed(1);
auto cache = MakeLocalCache<TString, TString>(
NMonotonic::CreateDefaultMonotonicTimeProvider(), {.ByteCapacity = 64, .TTL = TDuration::MilliSeconds(1)});
auto pool = CreateThreadPool(Threads);
for (auto&& a : GenerateRandomActions(Iterations)) {
Y_ENSURE(pool->AddFunc([cache, a = std::move(a)] {
if (a.IsGet) {
Y_DO_NOT_OPTIMIZE_AWAY(cache->Get(a.Key));
} else {
Y_DO_NOT_OPTIMIZE_AWAY(cache->Update(a.Key, std::move(a.Value)));
}
}));
}
pool->Stop();
}
} // Y_UNIT_TEST_SUITE(LocalCacheTests)
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