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// Copyright 2016 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/platform/web_task_runner.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/platform/scheduler/test/fake_task_runner.h"
namespace blink {
namespace {
void Increment(int* x) {
++*x;
}
void GetIsActive(bool* is_active, TaskHandle* handle) {
*is_active = handle->IsActive();
}
class CancellationTestHelper {
public:
CancellationTestHelper() : weak_ptr_factory_(this) {}
base::WeakPtr<CancellationTestHelper> GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
void RevokeWeakPtrs() { weak_ptr_factory_.InvalidateWeakPtrs(); }
void IncrementCounter() { ++counter_; }
int Counter() const { return counter_; }
private:
int counter_ = 0;
base::WeakPtrFactory<CancellationTestHelper> weak_ptr_factory_;
};
} // namespace
TEST(WebTaskRunnerTest, PostCancellableTaskTest) {
scoped_refptr<scheduler::FakeTaskRunner> task_runner =
base::MakeRefCounted<scheduler::FakeTaskRunner>();
// Run without cancellation.
int count = 0;
TaskHandle handle = PostCancellableTask(
*task_runner, FROM_HERE, WTF::Bind(&Increment, WTF::Unretained(&count)));
EXPECT_EQ(0, count);
EXPECT_TRUE(handle.IsActive());
task_runner->RunUntilIdle();
EXPECT_EQ(1, count);
EXPECT_FALSE(handle.IsActive());
count = 0;
handle = PostDelayedCancellableTask(
*task_runner, FROM_HERE, WTF::Bind(&Increment, WTF::Unretained(&count)),
TimeDelta::FromMilliseconds(1));
EXPECT_EQ(0, count);
EXPECT_TRUE(handle.IsActive());
task_runner->RunUntilIdle();
EXPECT_EQ(1, count);
EXPECT_FALSE(handle.IsActive());
// Cancel a task.
count = 0;
handle = PostCancellableTask(*task_runner, FROM_HERE,
WTF::Bind(&Increment, WTF::Unretained(&count)));
handle.Cancel();
EXPECT_EQ(0, count);
EXPECT_FALSE(handle.IsActive());
task_runner->RunUntilIdle();
EXPECT_EQ(0, count);
// The task should be cancelled when the handle is dropped.
{
count = 0;
TaskHandle handle2 =
PostCancellableTask(*task_runner, FROM_HERE,
WTF::Bind(&Increment, WTF::Unretained(&count)));
EXPECT_TRUE(handle2.IsActive());
}
EXPECT_EQ(0, count);
task_runner->RunUntilIdle();
EXPECT_EQ(0, count);
// The task should be cancelled when another TaskHandle is assigned on it.
count = 0;
handle = PostCancellableTask(*task_runner, FROM_HERE,
WTF::Bind(&Increment, WTF::Unretained(&count)));
handle = PostCancellableTask(*task_runner, FROM_HERE, WTF::Bind([] {}));
EXPECT_EQ(0, count);
task_runner->RunUntilIdle();
EXPECT_EQ(0, count);
// Self assign should be nop.
count = 0;
handle = PostCancellableTask(*task_runner, FROM_HERE,
WTF::Bind(&Increment, WTF::Unretained(&count)));
#if defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wself-move"
handle = std::move(handle);
#pragma GCC diagnostic pop
#else
handle = std::move(handle);
#endif // defined(__clang__)
EXPECT_EQ(0, count);
task_runner->RunUntilIdle();
EXPECT_EQ(1, count);
// handle->isActive() should switch to false before the task starts running.
bool is_active = false;
handle =
PostCancellableTask(*task_runner, FROM_HERE,
WTF::Bind(&GetIsActive, WTF::Unretained(&is_active),
WTF::Unretained(&handle)));
EXPECT_TRUE(handle.IsActive());
task_runner->RunUntilIdle();
EXPECT_FALSE(is_active);
EXPECT_FALSE(handle.IsActive());
}
TEST(WebTaskRunnerTest, CancellationCheckerTest) {
scoped_refptr<scheduler::FakeTaskRunner> task_runner =
base::MakeRefCounted<scheduler::FakeTaskRunner>();
int count = 0;
TaskHandle handle = PostCancellableTask(
*task_runner, FROM_HERE, WTF::Bind(&Increment, WTF::Unretained(&count)));
EXPECT_EQ(0, count);
// TaskHandle::isActive should detect the deletion of posted task.
auto queue = task_runner->TakePendingTasksForTesting();
ASSERT_EQ(1u, queue.size());
EXPECT_FALSE(queue[0].first.IsCancelled());
EXPECT_TRUE(handle.IsActive());
queue.clear();
EXPECT_FALSE(handle.IsActive());
EXPECT_EQ(0, count);
count = 0;
CancellationTestHelper helper;
handle =
PostCancellableTask(*task_runner, FROM_HERE,
WTF::Bind(&CancellationTestHelper::IncrementCounter,
helper.GetWeakPtr()));
EXPECT_EQ(0, helper.Counter());
// The cancellation of the posted task should be propagated to TaskHandle.
queue = task_runner->TakePendingTasksForTesting();
ASSERT_EQ(1u, queue.size());
EXPECT_FALSE(queue[0].first.IsCancelled());
EXPECT_TRUE(handle.IsActive());
helper.RevokeWeakPtrs();
EXPECT_TRUE(queue[0].first.IsCancelled());
EXPECT_FALSE(handle.IsActive());
}
} // namespace blink
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