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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/loader/long_task_detector.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/platform/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/testing/testing_platform_support_with_mock_scheduler.h"
#include "third_party/blink/renderer/platform/wtf/time.h"
namespace blink {
namespace {
class TestLongTaskObserver :
// This has to be garbage collected since LongTaskObserver uses
// GarbageCollectedMixin.
public GarbageCollectedFinalized<TestLongTaskObserver>,
public LongTaskObserver {
USING_GARBAGE_COLLECTED_MIXIN(TestLongTaskObserver);
public:
TimeTicks last_long_task_start;
TimeTicks last_long_task_end;
// LongTaskObserver implementation.
void OnLongTaskDetected(TimeTicks start_time, TimeTicks end_time) override {
last_long_task_start = start_time;
last_long_task_end = end_time;
}
}; // Anonymous namespace
} // namespace
class LongTaskDetectorTest : public testing::Test {
public:
// Public because it's executed on a task queue.
void DummyTaskWithDuration(base::TimeDelta duration) {
dummy_task_start_time_ = CurrentTimeTicks();
platform_->AdvanceClock(duration);
dummy_task_end_time_ = CurrentTimeTicks();
}
protected:
void SetUp() override {
// For some reason, platform needs to run for non-zero seconds before we
// start posting tasks to it. Otherwise TaskTimeObservers don't get notified
// of tasks.
platform_->RunForPeriodSeconds(1);
}
TimeTicks DummyTaskStartTime() { return dummy_task_start_time_; }
TimeTicks DummyTaskEndTime() { return dummy_task_end_time_; }
void SimulateTask(base::TimeDelta duration) {
Thread::Current()->GetTaskRunner()->PostTask(
FROM_HERE, WTF::Bind(&LongTaskDetectorTest::DummyTaskWithDuration,
WTF::Unretained(this), duration));
platform_->RunUntilIdle();
}
ScopedTestingPlatformSupport<TestingPlatformSupportWithMockScheduler>
platform_;
private:
TimeTicks dummy_task_start_time_;
TimeTicks dummy_task_end_time_;
};
TEST_F(LongTaskDetectorTest, DeliversLongTaskNotificationOnlyWhenRegistered) {
TestLongTaskObserver* long_task_observer =
MakeGarbageCollected<TestLongTaskObserver>();
SimulateTask(LongTaskDetector::kLongTaskThreshold +
base::TimeDelta::FromMilliseconds(10));
EXPECT_EQ(long_task_observer->last_long_task_end, TimeTicks());
LongTaskDetector::Instance().RegisterObserver(long_task_observer);
SimulateTask(LongTaskDetector::kLongTaskThreshold +
base::TimeDelta::FromMilliseconds(10));
TimeTicks long_task_end_when_registered = DummyTaskEndTime();
EXPECT_EQ(long_task_observer->last_long_task_start, DummyTaskStartTime());
EXPECT_EQ(long_task_observer->last_long_task_end,
long_task_end_when_registered);
LongTaskDetector::Instance().UnregisterObserver(long_task_observer);
SimulateTask(LongTaskDetector::kLongTaskThreshold +
base::TimeDelta::FromMilliseconds(10));
// Check that we have a long task after unregistering observer.
ASSERT_FALSE(long_task_end_when_registered == DummyTaskEndTime());
EXPECT_EQ(long_task_observer->last_long_task_end,
long_task_end_when_registered);
}
TEST_F(LongTaskDetectorTest, DoesNotGetNotifiedOfShortTasks) {
TestLongTaskObserver* long_task_observer =
MakeGarbageCollected<TestLongTaskObserver>();
LongTaskDetector::Instance().RegisterObserver(long_task_observer);
SimulateTask(LongTaskDetector::kLongTaskThreshold -
base::TimeDelta::FromMilliseconds(10));
EXPECT_EQ(long_task_observer->last_long_task_end, TimeTicks());
SimulateTask(LongTaskDetector::kLongTaskThreshold +
base::TimeDelta::FromMilliseconds(10));
EXPECT_EQ(long_task_observer->last_long_task_end, DummyTaskEndTime());
LongTaskDetector::Instance().UnregisterObserver(long_task_observer);
}
TEST_F(LongTaskDetectorTest, RegisterSameObserverTwice) {
TestLongTaskObserver* long_task_observer =
MakeGarbageCollected<TestLongTaskObserver>();
LongTaskDetector::Instance().RegisterObserver(long_task_observer);
LongTaskDetector::Instance().RegisterObserver(long_task_observer);
SimulateTask(LongTaskDetector::kLongTaskThreshold +
base::TimeDelta::FromMilliseconds(10));
TimeTicks long_task_end_when_registered = DummyTaskEndTime();
EXPECT_EQ(long_task_observer->last_long_task_start, DummyTaskStartTime());
EXPECT_EQ(long_task_observer->last_long_task_end,
long_task_end_when_registered);
LongTaskDetector::Instance().UnregisterObserver(long_task_observer);
// Should only need to unregister once even after we called RegisterObserver
// twice.
SimulateTask(LongTaskDetector::kLongTaskThreshold +
base::TimeDelta::FromMilliseconds(10));
ASSERT_FALSE(long_task_end_when_registered == DummyTaskEndTime());
EXPECT_EQ(long_task_observer->last_long_task_end,
long_task_end_when_registered);
}
} // namespace blink
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