Index: base/test/test_mock_time_task_runner.h |
diff --git a/base/test/test_mock_time_task_runner.h b/base/test/test_mock_time_task_runner.h |
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+// Copyright 2015 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. |
+ |
+#ifndef BASE_TEST_TEST_MOCK_TIME_TASK_RUNNER_H_ |
+#define BASE_TEST_TEST_MOCK_TIME_TASK_RUNNER_H_ |
+ |
+#include <queue> |
+#include <vector> |
+ |
+#include "base/macros.h" |
+#include "base/memory/scoped_ptr.h" |
+#include "base/single_thread_task_runner.h" |
+#include "base/synchronization/lock.h" |
+#include "base/test/test_pending_task.h" |
+#include "base/threading/thread_checker.h" |
+#include "base/time/tick_clock.h" |
+#include "base/time/time.h" |
+ |
+namespace base { |
+ |
+// Runs pending tasks in the order of the tasks' post time + delay, and keeps |
+// track of a mock (virtual) tick clock time that can be fast-forwarded. |
+// |
+// TestMockTimeTaskRunner has the following properties: |
+// |
+// - Methods RunsTasksOnCurrentThread() and Post[Delayed]Task() can be called |
+// from any thread, but the rest of the methods must be called on the same |
+// thread the TaskRunner was created on. |
+// - It allows for reentrancy, in that it handles the running of tasks that in |
+// turn call back into it (e.g., to post more tasks). |
+// - Tasks are stored in a priority queue, and executed in the increasing |
+// order of post time + delay. |
+// - Non-nestable tasks are not supported. |
+// - Tasks aren't guaranteed to be destroyed immediately after they're run. |
+// |
+// This is a slightly more sophisticated version of TestSimpleTaskRunner, in |
+// that it supports running delayed tasks in the correct temporal order. |
+class TestMockTimeTaskRunner : public base::SingleThreadTaskRunner { |
+ public: |
+ TestMockTimeTaskRunner(); |
+ |
+ // Fast-forwards virtual time by |delta|, causing all tasks with a remaining |
+ // delay less than or equal to |delta| to be executed. |
+ void FastForwardBy(base::TimeDelta delta); |
+ |
+ // Fast-forwards virtual time just until all tasks are executed. |
+ void FastForwardUntilNoTasksRemain(); |
+ |
+ // Executes all tasks that have no remaining delay. Tasks with a remaining |
+ // delay greater than zero will remain enqueued, and no virtual time will |
+ // elapse. |
+ void RunUntilIdle(); |
+ |
+ // Returns the current virtual time. |
+ TimeTicks GetCurrentMockTime() const; |
+ |
+ // Returns a TickClock that uses the mock time of |this| as its time source. |
+ scoped_ptr<TickClock> GetMockTickClock() const; |
+ |
+ bool HasPendingTask() const; |
+ TimeDelta NextPendingTaskDelay() const; |
+ |
+ // SingleThreadTaskRunner: |
+ bool RunsTasksOnCurrentThread() const override; |
+ bool PostDelayedTask(const tracked_objects::Location& from_here, |
+ const base::Closure& task, |
+ TimeDelta delay) override; |
+ bool PostNonNestableDelayedTask( |
+ const tracked_objects::Location& from_here, |
+ const base::Closure& task, |
+ TimeDelta delay) override; |
+ |
+ protected: |
+ ~TestMockTimeTaskRunner() override; |
+ |
+ // Called before the next task to run is selected, so that subclasses have a |
+ // last chance to make sure all tasks are posted. |
+ virtual void OnBeforeSelectingTask(); |
+ |
+ // Called after the current mock time has been incremented so that subclasses |
+ // can react to the passing of time. |
+ virtual void OnAfterTimePassed(); |
+ |
+ // Called after each task is run so that subclasses may perform additional |
+ // activities, e.g., pump additional task runners. |
+ virtual void OnAfterTaskRun(); |
+ |
+ private: |
+ // Predicate that defines a strict weak temporal ordering of tasks. |
+ class TemporalOrder { |
+ public: |
+ bool operator()(const TestPendingTask& first_task, |
+ const TestPendingTask& second_task) const; |
+ }; |
+ |
+ typedef std::priority_queue<TestPendingTask, |
+ std::vector<TestPendingTask>, |
+ TemporalOrder> TaskPriorityQueue; |
+ |
+ // Returns the |next_task| to run if there is any with a running time that is |
+ // at most |reference| + |max_delta|. This additional complexity is required |
+ // so that |max_delta| == TimeDelta::Max() can be supported. |
+ bool DequeueNextTask(const base::TimeTicks& reference, |
+ const base::TimeDelta& max_delta, |
+ TestPendingTask* next_task); |
+ |
+ base::ThreadChecker thread_checker_; |
+ base::TimeTicks now_; |
+ |
+ // Temporally ordered heap of pending tasks. Must only be accessed while the |
+ // |tasks_lock_| is held. |
+ TaskPriorityQueue tasks_; |
+ base::Lock tasks_lock_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(TestMockTimeTaskRunner); |
+}; |
+ |
+} // namespace base |
+ |
+#endif // BASE_TEST_TEST_MOCK_TIME_TASK_RUNNER_H_ |