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/*
* Copyright 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/unique_id_generator.h"
#include <string>
#include <vector>
#include "absl/algorithm/container.h"
#include "absl/functional/any_invocable.h"
#include "api/array_view.h"
#include "api/task_queue/task_queue_base.h"
#include "api/units/time_delta.h"
#include "rtc_base/gunit.h"
#include "rtc_base/helpers.h"
#include "test/gmock.h"
using ::testing::IsEmpty;
using ::testing::Test;
namespace rtc {
namespace {
// Utility class that registers itself as the currently active task queue.
class FakeTaskQueue : public webrtc::TaskQueueBase {
public:
FakeTaskQueue() : task_queue_setter_(this) {}
void Delete() override {}
void PostTaskImpl(absl::AnyInvocable<void() &&> task,
const PostTaskTraits& traits,
const webrtc::Location& location) override {}
void PostDelayedTaskImpl(absl::AnyInvocable<void() &&> task,
webrtc::TimeDelta delay,
const PostDelayedTaskTraits& traits,
const webrtc::Location& location) override {}
private:
CurrentTaskQueueSetter task_queue_setter_;
};
} // namespace
template <typename Generator>
class UniqueIdGeneratorTest : public Test {};
using test_types = ::testing::Types<UniqueNumberGenerator<uint8_t>,
UniqueNumberGenerator<uint16_t>,
UniqueNumberGenerator<uint32_t>,
UniqueNumberGenerator<int>,
UniqueRandomIdGenerator,
UniqueStringGenerator>;
TYPED_TEST_SUITE(UniqueIdGeneratorTest, test_types);
TYPED_TEST(UniqueIdGeneratorTest, ElementsDoNotRepeat) {
typedef TypeParam Generator;
const size_t num_elements = 255;
Generator generator;
std::vector<typename Generator::value_type> values;
for (size_t i = 0; i < num_elements; i++) {
values.push_back(generator.Generate());
}
EXPECT_EQ(num_elements, values.size());
// Use a set to check uniqueness.
std::set<typename Generator::value_type> set(values.begin(), values.end());
EXPECT_EQ(values.size(), set.size()) << "Returned values were not unique.";
}
TYPED_TEST(UniqueIdGeneratorTest, KnownElementsAreNotGenerated) {
typedef TypeParam Generator;
const size_t num_elements = 100;
rtc::InitRandom(0);
Generator generator1;
std::vector<typename Generator::value_type> known_values;
for (size_t i = 0; i < num_elements; i++) {
known_values.push_back(generator1.Generate());
}
EXPECT_EQ(num_elements, known_values.size());
rtc::InitRandom(0);
Generator generator2(known_values);
std::vector<typename Generator::value_type> values;
for (size_t i = 0; i < num_elements; i++) {
values.push_back(generator2.Generate());
}
EXPECT_THAT(values, ::testing::SizeIs(num_elements));
absl::c_sort(values);
absl::c_sort(known_values);
std::vector<typename Generator::value_type> intersection;
absl::c_set_intersection(values, known_values,
std::back_inserter(intersection));
EXPECT_THAT(intersection, IsEmpty());
}
TYPED_TEST(UniqueIdGeneratorTest, AddedElementsAreNotGenerated) {
typedef TypeParam Generator;
const size_t num_elements = 100;
rtc::InitRandom(0);
Generator generator1;
std::vector<typename Generator::value_type> known_values;
for (size_t i = 0; i < num_elements; i++) {
known_values.push_back(generator1.Generate());
}
EXPECT_EQ(num_elements, known_values.size());
rtc::InitRandom(0);
Generator generator2;
for (const typename Generator::value_type& value : known_values) {
generator2.AddKnownId(value);
}
std::vector<typename Generator::value_type> values;
for (size_t i = 0; i < num_elements; i++) {
values.push_back(generator2.Generate());
}
EXPECT_THAT(values, ::testing::SizeIs(num_elements));
absl::c_sort(values);
absl::c_sort(known_values);
std::vector<typename Generator::value_type> intersection;
absl::c_set_intersection(values, known_values,
std::back_inserter(intersection));
EXPECT_THAT(intersection, IsEmpty());
}
TYPED_TEST(UniqueIdGeneratorTest, AddKnownIdOnNewIdReturnsTrue) {
typedef TypeParam Generator;
rtc::InitRandom(0);
Generator generator1;
const typename Generator::value_type id = generator1.Generate();
rtc::InitRandom(0);
Generator generator2;
EXPECT_TRUE(generator2.AddKnownId(id));
}
TYPED_TEST(UniqueIdGeneratorTest, AddKnownIdCalledAgainForSameIdReturnsFalse) {
typedef TypeParam Generator;
rtc::InitRandom(0);
Generator generator1;
const typename Generator::value_type id = generator1.Generate();
rtc::InitRandom(0);
Generator generator2;
ASSERT_TRUE(generator2.AddKnownId(id));
EXPECT_FALSE(generator2.AddKnownId(id));
}
TYPED_TEST(UniqueIdGeneratorTest,
AddKnownIdOnIdProvidedAsKnownToCtorReturnsFalse) {
typedef TypeParam Generator;
rtc::InitRandom(0);
Generator generator1;
const typename Generator::value_type id = generator1.Generate();
std::vector<typename Generator::value_type> known_values = {id};
rtc::InitRandom(0);
Generator generator2(known_values);
EXPECT_FALSE(generator2.AddKnownId(id));
}
// Tests that it's OK to construct the generator in one execution environment
// (thread/task queue) but use it in another.
TEST(UniqueNumberGenerator, UsedOnSecondaryThread) {
const auto* current_tq = webrtc::TaskQueueBase::Current();
// Construct the generator before `fake_task_queue` to ensure that it is
// constructed in a different execution environment than what
// `fake_task_queue` will represent.
UniqueNumberGenerator<uint32_t> generator;
FakeTaskQueue fake_task_queue;
// Sanity check to make sure we're in a different runtime environment.
ASSERT_NE(current_tq, webrtc::TaskQueueBase::Current());
// Generating an id should be fine in this context.
generator.Generate();
}
#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
TEST(UniqueNumberGeneratorDeathTest, FailsWhenUsedInWrongContext) {
// Instantiate the generator before the `loop`. This ensures that
// thread/sequence checkers will pick up a different thread environment than
// `fake_task_queue` will represent.
UniqueNumberGenerator<uint32_t> generator;
// Instantiate a fake task queue that will register itself as the current tq.
FakeTaskQueue initial_fake_task_queue;
// Generate an ID on the current thread. This causes the generator to attach
// to the current thread context.
generator.Generate();
// Instantiate a fake task queue that will register itself as the current tq.
FakeTaskQueue fake_task_queue;
// Attempting to generate an id should now trigger a dcheck.
EXPECT_DEATH(generator.Generate(), "");
}
#endif
} // namespace rtc
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