base/deferred_sequenced_task_runner_unittest.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/deferred_sequenced_task_runner.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/bind.h"
   9 #include "base/bind_helpers.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/message_loop/message_loop_proxy.h"
  13 #include "base/threading/non_thread_safe.h"
  14 #include "base/threading/thread.h"
  15 #include "testing/gmock/include/gmock/gmock.h"
  16 #include "testing/gtest/include/gtest/gtest.h"
  17
  18 namespace {
  19
  20 class DeferredSequencedTaskRunnerTest : public testing::Test,
  21                                         public base::NonThreadSafe {
  22  public:
  23   class ExecuteTaskOnDestructor :
  24       public base::RefCounted<ExecuteTaskOnDestructor> {
  25    public:
  26     ExecuteTaskOnDestructor(
  27         DeferredSequencedTaskRunnerTest* executor,
  28         int task_id)
  29         : executor_(executor),
  30           task_id_(task_id) {
  31     }
  32   private:
  33     friend class base::RefCounted<ExecuteTaskOnDestructor>;
  34     virtual ~ExecuteTaskOnDestructor() {
  35       executor_->ExecuteTask(task_id_);
  36     }
  37     DeferredSequencedTaskRunnerTest* executor_;
  38     int task_id_;
  39   };
  40
  41   void ExecuteTask(int task_id) {
  42     base::AutoLock lock(lock_);
  43     executed_task_ids_.push_back(task_id);
  44   }
  45
  46   void PostExecuteTask(int task_id) {
  47     runner_->PostTask(FROM_HERE,
  48                       base::Bind(&DeferredSequencedTaskRunnerTest::ExecuteTask,
  49                                  base::Unretained(this),
  50                                  task_id));
  51   }
  52
  53   void StartRunner() {
  54     runner_->Start();
  55   }
  56
  57   void DoNothing(ExecuteTaskOnDestructor* object) {
  58   }
  59
  60  protected:
  61   DeferredSequencedTaskRunnerTest() :
  62       loop_(),
  63       runner_(
  64           new base::DeferredSequencedTaskRunner(loop_.message_loop_proxy())) {
  65   }
  66
  67   base::MessageLoop loop_;
  68   scoped_refptr<base::DeferredSequencedTaskRunner> runner_;
  69   mutable base::Lock lock_;
  70   std::vector<int> executed_task_ids_;
  71 };
  72
  73 TEST_F(DeferredSequencedTaskRunnerTest, Stopped) {
  74   PostExecuteTask(1);
  75   loop_.RunUntilIdle();
  76   EXPECT_THAT(executed_task_ids_, testing::ElementsAre());
  77 }
  78
  79 TEST_F(DeferredSequencedTaskRunnerTest, Start) {
  80   StartRunner();
  81   PostExecuteTask(1);
  82   loop_.RunUntilIdle();
  83   EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1));
  84 }
  85
  86 TEST_F(DeferredSequencedTaskRunnerTest, StartWithMultipleElements) {
  87   StartRunner();
  88   for (int i = 1; i < 5; ++i)
  89     PostExecuteTask(i);
  90
  91   loop_.RunUntilIdle();
  92   EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1, 2, 3, 4));
  93 }
  94
  95 TEST_F(DeferredSequencedTaskRunnerTest, DeferredStart) {
  96   PostExecuteTask(1);
  97   loop_.RunUntilIdle();
  98   EXPECT_THAT(executed_task_ids_, testing::ElementsAre());
  99
 100   StartRunner();
 101   loop_.RunUntilIdle();
 102   EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1));
 103
 104   PostExecuteTask(2);
 105   loop_.RunUntilIdle();
 106   EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1, 2));
 107 }
 108
 109 TEST_F(DeferredSequencedTaskRunnerTest, DeferredStartWithMultipleElements) {
 110   for (int i = 1; i < 5; ++i)
 111     PostExecuteTask(i);
 112   loop_.RunUntilIdle();
 113   EXPECT_THAT(executed_task_ids_, testing::ElementsAre());
 114
 115   StartRunner();
 116   for (int i = 5; i < 9; ++i)
 117     PostExecuteTask(i);
 118   loop_.RunUntilIdle();
 119   EXPECT_THAT(executed_task_ids_, testing::ElementsAre(1, 2, 3, 4, 5, 6, 7, 8));
 120 }
 121
 122 TEST_F(DeferredSequencedTaskRunnerTest, DeferredStartWithMultipleThreads) {
 123   {
 124     base::Thread thread1("DeferredSequencedTaskRunnerTestThread1");
 125     base::Thread thread2("DeferredSequencedTaskRunnerTestThread2");
 126     thread1.Start();
 127     thread2.Start();
 128     for (int i = 0; i < 5; ++i) {
 129       thread1.message_loop()->PostTask(
 130           FROM_HERE,
 131           base::Bind(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
 132                      base::Unretained(this),
 133                      2 * i));
 134       thread2.message_loop()->PostTask(
 135           FROM_HERE,
 136           base::Bind(&DeferredSequencedTaskRunnerTest::PostExecuteTask,
 137                      base::Unretained(this),
 138                      2 * i + 1));
 139       if (i == 2) {
 140         thread1.message_loop()->PostTask(
 141             FROM_HERE,
 142             base::Bind(&DeferredSequencedTaskRunnerTest::StartRunner,
 143                        base::Unretained(this)));
 144       }
 145     }
 146   }
 147
 148   loop_.RunUntilIdle();
 149   EXPECT_THAT(executed_task_ids_,
 150       testing::WhenSorted(testing::ElementsAre(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)));
 151 }
 152
 153 TEST_F(DeferredSequencedTaskRunnerTest, ObjectDestructionOrder) {
 154   {
 155     base::Thread thread("DeferredSequencedTaskRunnerTestThread");
 156     thread.Start();
 157     runner_ =
 158         new base::DeferredSequencedTaskRunner(thread.message_loop_proxy());
 159     for (int i = 0; i < 5; ++i) {
 160       {
 161         // Use a block to ensure that no reference to |short_lived_object|
 162         // is kept on the main thread after it is posted to |runner_|.
 163         scoped_refptr<ExecuteTaskOnDestructor> short_lived_object =
 164             new ExecuteTaskOnDestructor(this, 2 * i);
 165         runner_->PostTask(
 166             FROM_HERE,
 167             base::Bind(&DeferredSequencedTaskRunnerTest::DoNothing,
 168                        base::Unretained(this),
 169                        short_lived_object));
 170       }
 171       // |short_lived_object| with id |2 * i| should be destroyed before the
 172       // task |2 * i + 1| is executed.
 173       PostExecuteTask(2 * i + 1);
 174     }
 175     StartRunner();
 176   }
 177
 178   // All |short_lived_object| with id |2 * i| are destroyed before the task
 179   // |2 * i + 1| is executed.
 180   EXPECT_THAT(executed_task_ids_,
 181               testing::ElementsAre(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));
 182 }
 183
 184 }  // namespace