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// Copyright 2021 The Abseil Authors
//
// 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
//
// https://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 "absl/strings/internal/cordz_update_tracker.h"
#include <array>
#include <thread> // NOLINT
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/base/attributes.h"
#include "absl/base/config.h"
#include "absl/synchronization/notification.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {
namespace {
using ::testing::AnyOf;
using ::testing::Eq;
using Method = CordzUpdateTracker::MethodIdentifier;
using Methods = std::array<Method, Method::kNumMethods>;
// Returns an array of all methods defined in `MethodIdentifier`
Methods AllMethods() {
return Methods{Method::kAssignString, Method::kAssignCord,
Method::kMoveAssignCord, Method::kAppendString,
Method::kAppendCord, Method::kMoveAppendCord,
Method::kPrependString, Method::kPrependCord,
Method::kMovePrependCord, Method::kAppendExternalMemory,
Method::kFlatten, Method::kGetAppendRegion,
Method::kRemovePrefix, Method::kRemoveSuffic,
Method::kSubCord};
}
TEST(CordzUpdateTracker, IsConstExprAndInitializesToZero) {
constexpr CordzUpdateTracker tracker;
for (Method method : AllMethods()) {
ASSERT_THAT(tracker.Value(method), Eq(0));
}
}
TEST(CordzUpdateTracker, LossyAdd) {
int64_t n = 1;
CordzUpdateTracker tracker;
for (Method method : AllMethods()) {
tracker.LossyAdd(method, n);
EXPECT_THAT(tracker.Value(method), Eq(n));
n += 2;
}
}
TEST(CordzUpdateTracker, CopyConstructor) {
int64_t n = 1;
CordzUpdateTracker src;
for (Method method : AllMethods()) {
src.LossyAdd(method, n);
n += 2;
}
n = 1;
CordzUpdateTracker tracker(src);
for (Method method : AllMethods()) {
EXPECT_THAT(tracker.Value(method), Eq(n));
n += 2;
}
}
TEST(CordzUpdateTracker, OperatorAssign) {
int64_t n = 1;
CordzUpdateTracker src;
CordzUpdateTracker tracker;
for (Method method : AllMethods()) {
src.LossyAdd(method, n);
n += 2;
}
n = 1;
tracker = src;
for (Method method : AllMethods()) {
EXPECT_THAT(tracker.Value(method), Eq(n));
n += 2;
}
}
TEST(CordzUpdateTracker, ThreadSanitizedValueCheck) {
absl::Notification done;
CordzUpdateTracker tracker;
std::thread reader([&done, &tracker] {
while (!done.HasBeenNotified()) {
int n = 1;
for (Method method : AllMethods()) {
EXPECT_THAT(tracker.Value(method), AnyOf(Eq(n), Eq(0)));
n += 2;
}
}
int n = 1;
for (Method method : AllMethods()) {
EXPECT_THAT(tracker.Value(method), Eq(n));
n += 2;
}
});
int64_t n = 1;
for (Method method : AllMethods()) {
tracker.LossyAdd(method, n);
n += 2;
}
done.Notify();
reader.join();
}
} // namespace
} // namespace cord_internal
ABSL_NAMESPACE_END
} // namespace absl
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