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// Copyright (c) 2010 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 "base/basictypes.h"
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "base/task_queue.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
// Sets bools according to whether Run or the destructor were called.
class TrackCallsTask : public Task {
public:
TrackCallsTask(bool* ran, bool* deleted)
: ran_(ran),
deleted_(deleted) {
*ran_ = false;
*deleted_ = false;
}
virtual ~TrackCallsTask() {
*deleted_ = true;
}
virtual void Run() {
*ran_ = true;
}
private:
bool* ran_;
bool* deleted_;
DISALLOW_COPY_AND_ASSIGN(TrackCallsTask);
};
// Adds a given task to the queue when run.
class TaskQueuerTask : public Task {
public:
TaskQueuerTask(TaskQueue* queue, Task* task_to_queue)
: queue_(queue),
task_to_queue_(task_to_queue) {
}
virtual void Run() {
queue_->Push(task_to_queue_);
}
private:
TaskQueue* queue_;
Task* task_to_queue_;
DISALLOW_COPY_AND_ASSIGN(TaskQueuerTask);
};
} // namespace
TEST(TaskQueueTest, RunNoTasks) {
TaskQueue queue;
EXPECT_TRUE(queue.IsEmpty());
queue.Run();
EXPECT_TRUE(queue.IsEmpty());
}
TEST(TaskQueueTest, RunTasks) {
TaskQueue queue;
bool ran_task1 = false;
bool deleted_task1 = false;
queue.Push(new TrackCallsTask(&ran_task1, &deleted_task1));
bool ran_task2 = false;
bool deleted_task2 = false;
queue.Push(new TrackCallsTask(&ran_task2, &deleted_task2));
queue.Run();
EXPECT_TRUE(ran_task1);
EXPECT_TRUE(deleted_task1);
EXPECT_TRUE(ran_task2);
EXPECT_TRUE(deleted_task2);
EXPECT_TRUE(queue.IsEmpty());
}
TEST(TaskQueueTest, ClearTasks) {
TaskQueue queue;
bool ran_task1 = false;
bool deleted_task1 = false;
queue.Push(new TrackCallsTask(&ran_task1, &deleted_task1));
bool ran_task2 = false;
bool deleted_task2 = false;
queue.Push(new TrackCallsTask(&ran_task2, &deleted_task2));
queue.Clear();
EXPECT_TRUE(queue.IsEmpty());
queue.Run();
EXPECT_FALSE(ran_task1);
EXPECT_TRUE(deleted_task1);
EXPECT_FALSE(ran_task2);
EXPECT_TRUE(deleted_task2);
EXPECT_TRUE(queue.IsEmpty());
}
TEST(TaskQueueTest, OneTaskQueuesMore) {
TaskQueue main_queue;
// Build a task which will queue two more when run.
scoped_ptr<TaskQueue> nested_queue(new TaskQueue());
bool ran_task1 = false;
bool deleted_task1 = false;
nested_queue->Push(
new TaskQueuerTask(&main_queue,
new TrackCallsTask(&ran_task1, &deleted_task1)));
bool ran_task2 = false;
bool deleted_task2 = false;
nested_queue->Push(
new TaskQueuerTask(&main_queue,
new TrackCallsTask(&ran_task2, &deleted_task2)));
main_queue.Push(nested_queue.release());
// Run the task which pushes two more tasks.
main_queue.Run();
// None of the pushed tasks shoudl have run yet.
EXPECT_FALSE(ran_task1);
EXPECT_FALSE(deleted_task1);
EXPECT_FALSE(ran_task2);
EXPECT_FALSE(deleted_task2);
EXPECT_FALSE(main_queue.IsEmpty());
// Now run the nested tasks.
main_queue.Run();
EXPECT_TRUE(ran_task1);
EXPECT_TRUE(deleted_task1);
EXPECT_TRUE(ran_task2);
EXPECT_TRUE(deleted_task2);
EXPECT_TRUE(main_queue.IsEmpty());
}
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