| // Copyright 2015 The Chromium OS 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 LIBCHROMEOS_CHROMEOS_MESSAGE_LOOPS_FAKE_MESSAGE_LOOP_H_ |
| #define LIBCHROMEOS_CHROMEOS_MESSAGE_LOOPS_FAKE_MESSAGE_LOOP_H_ |
| |
| #include <functional> |
| #include <map> |
| #include <queue> |
| #include <set> |
| #include <utility> |
| #include <vector> |
| |
| #include <base/location.h> |
| #include <base/test/simple_test_clock.h> |
| #include <base/time/time.h> |
| |
| #include <chromeos/chromeos_export.h> |
| #include <chromeos/message_loops/message_loop.h> |
| |
| namespace chromeos { |
| |
| // The FakeMessageLoop implements a message loop that doesn't block or wait for |
| // time based tasks to be ready. The tasks are executed in the order they should |
| // be executed in a real message loop implementation, but the time is advanced |
| // to the time when the first task should be executed instead of blocking. |
| // To keep a consistent notion of time for other classes, FakeMessageLoop |
| // optionally updates a SimpleTestClock instance when it needs to advance the |
| // clock. |
| // This message loop implementation is useful for unittests. |
| class CHROMEOS_EXPORT FakeMessageLoop : public MessageLoop { |
| public: |
| // Create a FakeMessageLoop optionally using a SimpleTestClock to update the |
| // time when Run() or RunOnce(true) are called and should block. |
| explicit FakeMessageLoop(base::SimpleTestClock* clock); |
| ~FakeMessageLoop() override = default; |
| |
| TaskId PostDelayedTask(const tracked_objects::Location& from_here, |
| const base::Closure& task, |
| base::TimeDelta delay) override; |
| using MessageLoop::PostDelayedTask; |
| TaskId WatchFileDescriptor(const tracked_objects::Location& from_here, |
| int fd, |
| WatchMode mode, |
| bool persistent, |
| const base::Closure& task) override; |
| using MessageLoop::WatchFileDescriptor; |
| bool CancelTask(TaskId task_id) override; |
| bool RunOnce(bool may_block) override; |
| |
| // FakeMessageLoop methods: |
| |
| // Pretend, for the purpose of the FakeMessageLoop watching for file |
| // descriptors, that the file descriptor |fd| readiness to perform the |
| // operation described by |mode| is |ready|. Initially, no file descriptor |
| // is ready for any operation. |
| void SetFileDescriptorReadiness(int fd, WatchMode mode, bool ready); |
| |
| // Return whether there are peding tasks. Useful to check that no |
| // callbacks were leaked. |
| bool PendingTasks(); |
| |
| private: |
| struct ScheduledTask { |
| tracked_objects::Location location; |
| bool persistent; |
| base::Closure callback; |
| }; |
| |
| // The sparse list of scheduled pending callbacks. |
| std::map<MessageLoop::TaskId, ScheduledTask> tasks_; |
| |
| // Using std::greater<> for the priority_queue means that the top() of the |
| // queue is the lowest (earliest) time, and for the same time, the smallest |
| // TaskId. This determines the order in which the tasks will be fired. |
| std::priority_queue< |
| std::pair<base::Time, MessageLoop::TaskId>, |
| std::vector<std::pair<base::Time, MessageLoop::TaskId>>, |
| std::greater<std::pair<base::Time, MessageLoop::TaskId>>> fire_order_; |
| |
| // The bag of watched (fd, mode) pair associated with the TaskId that's |
| // watching them. |
| std::multimap<std::pair<int, WatchMode>, MessageLoop::TaskId> fds_watched_; |
| |
| // The set of (fd, mode) pairs that are faked as ready. |
| std::set<std::pair<int, WatchMode>> fds_ready_; |
| |
| base::SimpleTestClock* test_clock_ = nullptr; |
| base::Time current_time_ = base::Time::FromDoubleT(1246996800.); |
| |
| MessageLoop::TaskId last_id_ = kTaskIdNull; |
| |
| DISALLOW_COPY_AND_ASSIGN(FakeMessageLoop); |
| }; |
| |
| } // namespace chromeos |
| |
| #endif // LIBCHROMEOS_CHROMEOS_MESSAGE_LOOPS_FAKE_MESSAGE_LOOP_H_ |