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// Copyright 2019 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_sample_token.h"
#include <memory>
#include <type_traits>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "absl/random/random.h"
#include "absl/strings/cordz_test_helpers.h"
#include "absl/strings/internal/cord_rep_flat.h"
#include "absl/strings/internal/cordz_handle.h"
#include "absl/strings/internal/cordz_info.h"
#include "absl/synchronization/internal/thread_pool.h"
#include "absl/synchronization/notification.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {
namespace {
using ::testing::ElementsAre;
using ::testing::Eq;
using ::testing::Ne;
// Used test values
auto constexpr kTrackCordMethod = CordzUpdateTracker::kConstructorString;
TEST(CordzSampleTokenTest, IteratorTraits) {
static_assert(std::is_copy_constructible<CordzSampleToken::Iterator>::value,
"");
static_assert(std::is_copy_assignable<CordzSampleToken::Iterator>::value, "");
static_assert(std::is_move_constructible<CordzSampleToken::Iterator>::value,
"");
static_assert(std::is_move_assignable<CordzSampleToken::Iterator>::value, "");
static_assert(
std::is_same<
std::iterator_traits<CordzSampleToken::Iterator>::iterator_category,
std::input_iterator_tag>::value,
"");
static_assert(
std::is_same<std::iterator_traits<CordzSampleToken::Iterator>::value_type,
const CordzInfo&>::value,
"");
static_assert(
std::is_same<
std::iterator_traits<CordzSampleToken::Iterator>::difference_type,
ptrdiff_t>::value,
"");
static_assert(
std::is_same<std::iterator_traits<CordzSampleToken::Iterator>::pointer,
const CordzInfo*>::value,
"");
static_assert(
std::is_same<std::iterator_traits<CordzSampleToken::Iterator>::reference,
const CordzInfo&>::value,
"");
}
TEST(CordzSampleTokenTest, IteratorEmpty) {
CordzSampleToken token;
EXPECT_THAT(token.begin(), Eq(token.end()));
}
TEST(CordzSampleTokenTest, Iterator) {
TestCordData cord1, cord2, cord3;
CordzInfo::TrackCord(cord1.data, kTrackCordMethod);
CordzInfo* info1 = cord1.data.cordz_info();
CordzInfo::TrackCord(cord2.data, kTrackCordMethod);
CordzInfo* info2 = cord2.data.cordz_info();
CordzInfo::TrackCord(cord3.data, kTrackCordMethod);
CordzInfo* info3 = cord3.data.cordz_info();
CordzSampleToken token;
std::vector<const CordzInfo*> found;
for (const CordzInfo& cord_info : token) {
found.push_back(&cord_info);
}
EXPECT_THAT(found, ElementsAre(info3, info2, info1));
info1->Untrack();
info2->Untrack();
info3->Untrack();
}
TEST(CordzSampleTokenTest, IteratorEquality) {
TestCordData cord1;
TestCordData cord2;
TestCordData cord3;
CordzInfo::TrackCord(cord1.data, kTrackCordMethod);
CordzInfo* info1 = cord1.data.cordz_info();
CordzSampleToken token1;
// lhs starts with the CordzInfo corresponding to cord1 at the head.
CordzSampleToken::Iterator lhs = token1.begin();
CordzInfo::TrackCord(cord2.data, kTrackCordMethod);
CordzInfo* info2 = cord2.data.cordz_info();
CordzSampleToken token2;
// rhs starts with the CordzInfo corresponding to cord2 at the head.
CordzSampleToken::Iterator rhs = token2.begin();
CordzInfo::TrackCord(cord3.data, kTrackCordMethod);
CordzInfo* info3 = cord3.data.cordz_info();
// lhs is on cord1 while rhs is on cord2.
EXPECT_THAT(lhs, Ne(rhs));
rhs++;
// lhs and rhs are both on cord1, but they didn't come from the same
// CordzSampleToken.
EXPECT_THAT(lhs, Ne(rhs));
lhs++;
rhs++;
// Both lhs and rhs are done, so they are on nullptr.
EXPECT_THAT(lhs, Eq(rhs));
info1->Untrack();
info2->Untrack();
info3->Untrack();
}
TEST(CordzSampleTokenTest, MultiThreaded) {
Notification stop;
static constexpr int kNumThreads = 4;
static constexpr int kNumCords = 3;
static constexpr int kNumTokens = 3;
absl::synchronization_internal::ThreadPool pool(kNumThreads);
for (int i = 0; i < kNumThreads; ++i) {
pool.Schedule([&stop]() {
absl::BitGen gen;
TestCordData cords[kNumCords];
std::unique_ptr<CordzSampleToken> tokens[kNumTokens];
while (!stop.HasBeenNotified()) {
// Randomly perform one of five actions:
// 1) Untrack
// 2) Track
// 3) Iterate over Cords visible to a token.
// 4) Unsample
// 5) Sample
int index = absl::Uniform(gen, 0, kNumCords);
if (absl::Bernoulli(gen, 0.5)) {
TestCordData& cord = cords[index];
// Track/untrack.
if (cord.data.is_profiled()) {
// 1) Untrack
cord.data.cordz_info()->Untrack();
cord.data.clear_cordz_info();;
} else {
// 2) Track
CordzInfo::TrackCord(cord.data, kTrackCordMethod);
}
} else {
std::unique_ptr<CordzSampleToken>& token = tokens[index];
if (token) {
if (absl::Bernoulli(gen, 0.5)) {
// 3) Iterate over Cords visible to a token.
for (const CordzInfo& info : *token) {
// This is trivial work to allow us to compile the loop.
EXPECT_THAT(info.Next(*token), Ne(&info));
}
} else {
// 4) Unsample
token = nullptr;
}
} else {
// 5) Sample
token = absl::make_unique<CordzSampleToken>();
}
}
}
for (TestCordData& cord : cords) {
CordzInfo::MaybeUntrackCord(cord.data.cordz_info());
}
});
}
// The threads will hammer away. Give it a little bit of time for tsan to
// spot errors.
absl::SleepFor(absl::Seconds(3));
stop.Notify();
}
} // namespace
} // namespace cord_internal
ABSL_NAMESPACE_END
} // namespace absl
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