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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/base/unique_notifier.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cc {
namespace {
class UniqueNotifierTest : public testing::Test {
public:
UniqueNotifierTest() : notification_count_(0) {}
void SetUp() override { ResetNotificationCount(); }
void Notify() { ++notification_count_; }
int NotificationCount() const { return notification_count_; }
void ResetNotificationCount() { notification_count_ = 0; }
protected:
int notification_count_;
};
// Need to guarantee that Schedule and Notify happen in the same thread.
// Multiple schedules may result in multiple runs when notify task is posted to
// a different thread. So we use thread checker to avoid this.
// Example which may result in multiple runs:
// base::Thread notifier_thread("NotifierThread");
// notifier_thread.Start();
// UniqueNotifier notifier(
// notifier_thread.task_runner().get(),
// base::BindRepeating(&UniqueNotifierTest::Notify,
// base::Unretained(this)));
// EXPECT_EQ(0, NotificationCount());
// for (int i = 0; i < 50000; ++i)
// notifier.Schedule();
// base::RunLoop().RunUntilIdle();
// notifier_thread.Stop();
// EXPECT_LE(1, NotificationCount());
// 50000 can be any number bigger than 1. The bigger the easier to more runs.
TEST_F(UniqueNotifierTest, Schedule) {
{
UniqueNotifier notifier(
base::SingleThreadTaskRunner::GetCurrentDefault().get(),
base::BindRepeating(&UniqueNotifierTest::Notify,
base::Unretained(this)));
EXPECT_EQ(0, NotificationCount());
// Basic schedule should result in a run.
notifier.Schedule();
base::RunLoop().RunUntilIdle();
EXPECT_EQ(1, NotificationCount());
// UniqueNotifier can only runs in the main thread, and multiple schedules
// should result in one run.
for (int i = 0; i < 5; ++i)
notifier.Schedule();
base::RunLoop().RunUntilIdle();
EXPECT_EQ(2, NotificationCount());
// Schedule and cancel.
notifier.Schedule();
notifier.Cancel();
base::RunLoop().RunUntilIdle();
EXPECT_EQ(2, NotificationCount());
notifier.Schedule();
notifier.Cancel();
notifier.Schedule();
base::RunLoop().RunUntilIdle();
EXPECT_EQ(3, NotificationCount());
notifier.Schedule();
}
// Notifier went out of scope, so we don't expect to get a notification.
base::RunLoop().RunUntilIdle();
EXPECT_EQ(3, NotificationCount());
}
} // namespace
} // namespace cc
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