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// Copyright (c) 2013 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/deferred_sequenced_task_runner.h"
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/location.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/non_thread_safe.h"
#include "base/threading/thread.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
class DeferredSequencedTaskRunnerTest : public testing::Test,
public base::NonThreadSafe {
public:
class ExecuteTaskOnDestructor :
public base::RefCounted<ExecuteTaskOnDestructor> {
public:
ExecuteTaskOnDestructor(
DeferredSequencedTaskRunnerTest* executor,
int task_id)
: executor_(executor),
task_id_(task_id) {
}
private:
friend class base::RefCounted<ExecuteTaskOnDestructor>;
virtual ~ExecuteTaskOnDestructor() {
executor_->ExecuteTask(task_id_);
}
DeferredSequencedTaskRunnerTest* executor_;
int task_id_;
};
void ExecuteTask(int task_id) {
base::AutoLock lock(lock_);
executed_task_ids_.push_back(task_id);
}
void PostExecuteTask(int task_id) {
runner_->PostTask(FROM_HERE,
base::Bind(&DeferredSequencedTaskRunnerTest::ExecuteTask,
base::Unretained(this),
task_id));
}
void StartRunner() {
runner_->Start();
}
void DoNothing(ExecuteTaskOnDestructor* object) {
}
protected:
DeferredSequencedTaskRunnerTest()
: loop_(),
runner_(new base::DeferredSequencedTaskRunner(loop_.task_runner())) {}
base::MessageLoop loop_;
scoped_refptr<base::DeferredSequencedTaskRunner> runner_;
mutable base::Lock lock_;
std::vector<int> executed_task_ids_;
};
TEST_F(DeferredSequencedTaskRunnerTest, Stopped) {
PostExecuteTask(1);
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre());
}
TEST_F(DeferredSequencedTaskRunnerTest, Start) {
StartRunner();
PostExecuteTask(1);
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1));
}
TEST_F(DeferredSequencedTaskRunnerTest, StartWithMultipleElements) {
StartRunner();
for (int i = 1; i < 5; ++i)
PostExecuteTask(i);
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1, 2, 3, 4));
}
TEST_F(DeferredSequencedTaskRunnerTest, DeferredStart) {
PostExecuteTask(1);
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre());
StartRunner();
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1));
PostExecuteTask(2);
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1, 2));
}
TEST_F(DeferredSequencedTaskRunnerTest, DeferredStartWithMultipleElements) {
for (int i = 1; i < 5; ++i)
PostExecuteTask(i);
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre());
StartRunner();
for (int i = 5; i < 9; ++i)
PostExecuteTask(i);
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1, 2, 3, 4, 5, 6, 7, 8));
}
TEST_F(DeferredSequencedTaskRunnerTest, DeferredStartWithMultipleThreads) {
{
base::Thread thread1("DeferredSequencedTaskRunnerTestThread1");
base::Thread thread2("DeferredSequencedTaskRunnerTestThread2");
thread1.Start();
thread2.Start();
for (int i = 0; i < 5; ++i) {
thread1.task_runner()->PostTask(
FROM_HERE,
base::Bind(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
base::Unretained(this), 2 * i));
thread2.task_runner()->PostTask(
FROM_HERE,
base::Bind(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
base::Unretained(this), 2 * i + 1));
if (i == 2) {
thread1.task_runner()->PostTask(
FROM_HERE, base::Bind(&DeferredSequencedTaskRunnerTest::StartRunner,
base::Unretained(this)));
}
}
}
loop_.RunUntilIdle();
EXPECT_THAT(executed_task_ids_,
testing::WhenSorted(testing::ElementsAre(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)));
}
TEST_F(DeferredSequencedTaskRunnerTest, ObjectDestructionOrder) {
{
base::Thread thread("DeferredSequencedTaskRunnerTestThread");
thread.Start();
runner_ = new base::DeferredSequencedTaskRunner(thread.task_runner());
for (int i = 0; i < 5; ++i) {
{
// Use a block to ensure that no reference to |short_lived_object|
// is kept on the main thread after it is posted to |runner_|.
scoped_refptr<ExecuteTaskOnDestructor> short_lived_object =
new ExecuteTaskOnDestructor(this, 2 * i);
runner_->PostTask(
FROM_HERE,
base::Bind(&DeferredSequencedTaskRunnerTest::DoNothing,
base::Unretained(this),
short_lived_object));
}
// |short_lived_object| with id |2 * i| should be destroyed before the
// task |2 * i + 1| is executed.
PostExecuteTask(2 * i + 1);
}
StartRunner();
}
// All |short_lived_object| with id |2 * i| are destroyed before the task
// |2 * i + 1| is executed.
EXPECT_THAT(executed_task_ids_,
testing::ElementsAre(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));
}
} // namespace
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