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// Copyright 2021 Google LLC
//
// 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 <memory>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/synchronization/mutex.h"
#include "absl/time/time.h"
#include "fcp/base/clock.h"
namespace fcp {
namespace {
using ::testing::ElementsAre;
using ::testing::Test;
class RealtimeClockTest : public Test {
public:
RealtimeClockTest() : start_(Clock::RealClock()->Now()) {}
void OnWakeUp(int waiter_id) {
absl::MutexLock lock(&mu_);
waiter_ids_.push_back(waiter_id);
waiter_intervals_.push_back(Clock::RealClock()->Now() - start_);
}
protected:
absl::Time start_;
absl::Mutex mu_;
std::vector<int> waiter_ids_ ABSL_GUARDED_BY(&mu_);
std::vector<absl::Duration> waiter_intervals_ ABSL_GUARDED_BY(&mu_);
};
// Simple callback waiter that records current waiter ID with the test.
class TestWaiter : public Clock::Waiter {
public:
explicit TestWaiter(int id, RealtimeClockTest* test) : id_(id), test_(test) {}
void WakeUp() override { test_->OnWakeUp(id_); }
private:
int id_;
RealtimeClockTest* test_;
};
TEST_F(RealtimeClockTest, MultipleTimerWakeUp) {
// Add 4 timers at various deadlines, the last one in the past.
Clock::RealClock()->WakeupWithDeadline(start_ + absl::Milliseconds(200),
std::make_shared<TestWaiter>(1, this));
Clock::RealClock()->WakeupWithDeadline(start_ + absl::Milliseconds(100),
std::make_shared<TestWaiter>(2, this));
Clock::RealClock()->WakeupWithDeadline(start_ + absl::Milliseconds(101),
std::make_shared<TestWaiter>(3, this));
Clock::RealClock()->WakeupWithDeadline(start_ - absl::Milliseconds(1),
std::make_shared<TestWaiter>(4, this));
// End the test when all 3 timers have been triggered.
auto test_done = [this]() {
mu_.AssertHeld();
return waiter_ids_.size() == 4;
};
absl::MutexLock lock(&mu_);
mu_.Await(absl::Condition(&test_done));
// Verify the results
EXPECT_THAT(waiter_ids_, ElementsAre(4, 2, 3, 1));
EXPECT_GE(waiter_intervals_[0], absl::ZeroDuration());
EXPECT_GE(waiter_intervals_[1], absl::Milliseconds(100));
EXPECT_GE(waiter_intervals_[2], absl::Milliseconds(101));
EXPECT_GE(waiter_intervals_[3], absl::Milliseconds(200));
}
} // namespace
} // namespace fcp
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