Task Scheduler.

base/task_scheduler/delayed_task_manager_unittest.cc

+// 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 "base/task_scheduler/delayed_task_manager.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/task_scheduler/priority_queue.h"
+#include "base/task_scheduler/sequence.h"
+#include "base/task_scheduler/shutdown_manager.h"
+#include "base/task_scheduler/task.h"
+#include "base/time/time.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+
+// Required by gmock.
+bool operator==(const Closure& closure, const Closure& other_closure) {
+  return closure.Equals(other_closure);
+}
+
+namespace task_scheduler {
+
+namespace {
+
+class TestDelayedTaskManager : public DelayedTaskManager {
+ public:
+  TestDelayedTaskManager()
+      : DelayedTaskManager(
+            Bind(&TestDelayedTaskManager::OnDelayedTaskReadyTimeChanged,
+                 Unretained(this)),
+            &shutdown_manager_) {}
+
+  void IncrementTime(TimeDelta delta) { now_ += delta; }
+  MOCK_METHOD0(OnDelayedTaskReadyTimeChanged, void());
+  TimeTicks Now() override { return now_; }
+
+ private:
+  TimeTicks now_;
+  ShutdownManager shutdown_manager_;
+};
+
+}  // namespace
+
+// Check that a task added to a DelayedTaskManager is added to the proper
+// sequence and priority queue by PostReadyTasks() when the current time is

[fdoray, 2016/02/11 17:30:33]

current time *becomes

[fdoray, 2016/02/12 04:16:19]

Done.

+// equal to the task delayed run time.
+TEST(TaskSchedulerDelayedTaskManagerTest, AddAndPostTask) {
+  TestDelayedTaskManager manager;
+
+  Task task(FROM_HERE, Bind(&DoNothing), TaskTraits(), TimeTicks());
+  const auto delay = TimeDelta::FromSeconds(1);
+  task.delayed_run_time = TimeTicks() + delay;
+
+  scoped_refptr<Sequence> sequence(new Sequence);
+  PriorityQueue priority_queue(Bind(&DoNothing));
+
+  EXPECT_CALL(manager, OnDelayedTaskReadyTimeChanged());
+  manager.AddDelayedTask(task, sequence, &priority_queue);
+  testing::Mock::VerifyAndClear(&manager);
+  EXPECT_EQ(TimeTicks() + delay, manager.GetNextDelayedTaskReadyTime());
+
+  manager.IncrementTime(delay);
+
+  manager.PostReadyTasks();
+  EXPECT_EQ(TimeTicks(), manager.GetNextDelayedTaskReadyTime());
+  EXPECT_EQ(task.posted_from, sequence->PeekTask()->posted_from);
+  SequenceSortKey sort_key;
+  EXPECT_EQ(sequence.get(),
+            priority_queue.BeginTransaction()->PeekSequence(&sort_key).get());
+}
+
+// Check that a task added to a DelayedTaskManager is added to the proper
+// sequence and priority queue by PostReadyTasks() when the current time is

[fdoray, 2016/02/11 17:30:32]

current time *becomes

[fdoray, 2016/02/12 04:16:19]

Done.

+// greater than the task delayed run time.
+TEST(TaskSchedulerDelayedTaskManagerTest, AddAndPostTaskLate) {
+  TestDelayedTaskManager manager;
+
+  Task task(FROM_HERE, Bind(&DoNothing), TaskTraits(), TimeTicks());
+  const auto delay = TimeDelta::FromSeconds(1);
+  task.delayed_run_time = TimeTicks() + delay;
+
+  scoped_refptr<Sequence> sequence(new Sequence);
+  PriorityQueue priority_queue(Bind(&DoNothing));
+
+  EXPECT_CALL(manager, OnDelayedTaskReadyTimeChanged());
+  manager.AddDelayedTask(task, sequence, &priority_queue);
+  testing::Mock::VerifyAndClear(&manager);
+  EXPECT_EQ(TimeTicks() + delay, manager.GetNextDelayedTaskReadyTime());
+
+  // Increment the time more than the task's delay.
+  manager.IncrementTime(TimeDelta::FromSeconds(10));
+
+  manager.PostReadyTasks();
+  EXPECT_EQ(TimeTicks(), manager.GetNextDelayedTaskReadyTime());
+  EXPECT_EQ(task.posted_from, sequence->PeekTask()->posted_from);
+}
+
+// Check that when multiple tasks are added to a DelayedTaskManager, they are
+// all inserted in their respective sequence and priority queue when they become
+// ripe for execution.
+TEST(TaskSchedulerDelayedTaskManagerTest, AddAndPostTasks) {
+  TestDelayedTaskManager manager;
+  size_t new_num_tasks = 0;
+
+  scoped_refptr<Sequence> sequence(new Sequence);
+  PriorityQueue priority_queue(Bind(&DoNothing));
+
+  Task task_a(FROM_HERE, Bind(&DoNothing), TaskTraits(), TimeTicks());
+  const auto delay_a = TimeDelta::FromSeconds(2);
+  task_a.delayed_run_time = TimeTicks() + delay_a;
+
+  Task task_b(FROM_HERE, Bind(&DoNothing), TaskTraits(), TimeTicks());
+  const auto delay_b = TimeDelta::FromSeconds(2);
+  task_b.delayed_run_time = TimeTicks() + delay_b;
+
+  Task task_c(FROM_HERE, Bind(&DoNothing), TaskTraits(), TimeTicks());
+  const auto delay_c = TimeDelta::FromSeconds(1);
+  task_c.delayed_run_time = TimeTicks() + delay_c;
+
+  EXPECT_CALL(manager, OnDelayedTaskReadyTimeChanged());
+  manager.AddDelayedTask(std::move(task_a), sequence, &priority_queue);
+  testing::Mock::VerifyAndClear(&manager);
+  EXPECT_EQ(TimeTicks() + delay_a, manager.GetNextDelayedTaskReadyTime());
+
+  manager.AddDelayedTask(std::move(task_b), sequence, &priority_queue);
+  testing::Mock::VerifyAndClear(&manager);
+  EXPECT_EQ(TimeTicks() + delay_a, manager.GetNextDelayedTaskReadyTime());
+
+  EXPECT_CALL(manager, OnDelayedTaskReadyTimeChanged());
+  manager.AddDelayedTask(std::move(task_c), sequence, &priority_queue);
+  testing::Mock::VerifyAndClear(&manager);
+  EXPECT_EQ(TimeTicks() + delay_c, manager.GetNextDelayedTaskReadyTime());
+
+  manager.IncrementTime(delay_c);
+
+  manager.PostReadyTasks();
+  EXPECT_EQ(task_c.posted_from, sequence->PeekTask()->posted_from);
+  sequence->PopTask(&new_num_tasks);
+  EXPECT_EQ(TimeTicks() + delay_a, manager.GetNextDelayedTaskReadyTime());
+
+  manager.IncrementTime(delay_a - delay_c);
+
+  manager.PostReadyTasks();
+  EXPECT_EQ(task_a.posted_from, sequence->PeekTask()->posted_from);
+  sequence->PopTask(&new_num_tasks);
+  EXPECT_EQ(task_b.posted_from, sequence->PeekTask()->posted_from);
+  sequence->PopTask(&new_num_tasks);
+  EXPECT_EQ(TimeTicks(), manager.GetNextDelayedTaskReadyTime());
+}
+
+}  // namespace task_scheduler
+}  // namespace base