[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 1 | // Copyright 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 | #ifndef CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_ |
| 6 | #define CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_ |
| 7 | |
| 8 | #include <list> |
| 9 | |
| 10 | #include "base/callback.h" |
[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 11 | #include "base/single_thread_task_runner.h" |
| 12 | |
| 13 | #include "build/build_config.h" |
| 14 | |
| 15 | #include "content/public/browser/browser_main_runner.h" |
| 16 | |
| 17 | namespace content { |
| 18 | |
| 19 | // A startup task is a void function returning the status on completion. |
| 20 | // a status of > 0 indicates a failure, and that no further startup tasks should |
| 21 | // be run. |
| 22 | typedef base::Callback<int(void)> StartupTask; |
| 23 | |
| 24 | // This class runs startup tasks. The tasks are either run immediately inline, |
| 25 | // or are queued one at a time on the UI thread's message loop. If the events |
| 26 | // are queued, UI events that are received during startup will be acted upon |
| 27 | // between startup tasks. The motivation for this is that, on targets where the |
| 28 | // UI is already started, it allows us to keep the UI responsive during startup. |
| 29 | // |
| 30 | // Note that this differs from a SingleThreadedTaskRunner in that there may be |
| 31 | // no opportunity to handle UI events between the tasks of a |
| 32 | // SingleThreadedTaskRunner. |
| 33 | |
[email protected] | 232e09d | 2013-08-27 15:29:56 | [diff] [blame] | 34 | class CONTENT_EXPORT StartupTaskRunner { |
[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 35 | |
| 36 | public: |
| 37 | // Constructor: Note that |startup_complete_callback| is optional. If it is |
| 38 | // not null it will be called once all the startup tasks have run. |
[email protected] | 232e09d | 2013-08-27 15:29:56 | [diff] [blame] | 39 | StartupTaskRunner(base::Callback<void(int)> startup_complete_callback, |
[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 40 | scoped_refptr<base::SingleThreadTaskRunner> proxy); |
| 41 | |
[email protected] | 232e09d | 2013-08-27 15:29:56 | [diff] [blame] | 42 | ~StartupTaskRunner(); |
[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 43 | |
[email protected] | 232e09d | 2013-08-27 15:29:56 | [diff] [blame] | 44 | // Add a task to the queue of startup tasks to be run. |
| 45 | void AddTask(StartupTask& callback); |
| 46 | |
| 47 | // Start running the tasks asynchronously. |
| 48 | void StartRunningTasksAsync(); |
| 49 | |
| 50 | // Run all tasks, or all remaining tasks, synchronously |
| 51 | void RunAllTasksNow(); |
[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 52 | |
| 53 | private: |
| 54 | friend class base::RefCounted<StartupTaskRunner>; |
[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 55 | |
| 56 | std::list<StartupTask> task_list_; |
| 57 | void WrappedTask(); |
| 58 | |
[email protected] | 57624ab | 2013-08-01 16:01:51 | [diff] [blame] | 59 | base::Callback<void(int)> startup_complete_callback_; |
| 60 | scoped_refptr<base::SingleThreadTaskRunner> proxy_; |
| 61 | |
| 62 | DISALLOW_COPY_AND_ASSIGN(StartupTaskRunner); |
| 63 | }; |
| 64 | |
| 65 | } // namespace content |
| 66 | #endif // CONTENT_BROWSER_STARTUP_TASK_RUNNER_H_ |