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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CONTENT_RENDERER_SCHEDULER_RESOURCE_DISPATCH_THROTTLER_H_ | 5 #ifndef CONTENT_RENDERER_SCHEDULER_RESOURCE_DISPATCH_THROTTLER_H_ |
6 #define CONTENT_RENDERER_SCHEDULER_RESOURCE_DISPATCH_THROTTLER_H_ | 6 #define CONTENT_RENDERER_SCHEDULER_RESOURCE_DISPATCH_THROTTLER_H_ |
7 | 7 |
| 8 #include <stdint.h> |
| 9 |
8 #include <deque> | 10 #include <deque> |
9 | 11 |
| 12 #include "base/macros.h" |
10 #include "base/threading/thread_checker.h" | 13 #include "base/threading/thread_checker.h" |
11 #include "base/time/time.h" | 14 #include "base/time/time.h" |
12 #include "base/timer/timer.h" | 15 #include "base/timer/timer.h" |
13 #include "content/common/content_export.h" | 16 #include "content/common/content_export.h" |
14 #include "ipc/ipc_sender.h" | 17 #include "ipc/ipc_sender.h" |
15 | 18 |
16 namespace scheduler { | 19 namespace scheduler { |
17 class RendererScheduler; | 20 class RendererScheduler; |
18 } | 21 } |
19 | 22 |
20 namespace content { | 23 namespace content { |
21 | 24 |
22 // Utility class for throttling a stream of resource requests targetted to a | 25 // Utility class for throttling a stream of resource requests targetted to a |
23 // specific IPC sender. The throttling itself is very basic: | 26 // specific IPC sender. The throttling itself is very basic: |
24 // * When there is no high-priority work imminent to the main thread, as | 27 // * When there is no high-priority work imminent to the main thread, as |
25 // indicated by the RendererScheduler, throttling is disabled. | 28 // indicated by the RendererScheduler, throttling is disabled. |
26 // * When >= N requests have been sent in a given time window, requests are | 29 // * When >= N requests have been sent in a given time window, requests are |
27 // throttled. A timer periodically flushes a portion of the queued requests | 30 // throttled. A timer periodically flushes a portion of the queued requests |
28 // until all such requests have been flushed. | 31 // until all such requests have been flushed. |
29 // TODO(jdduke): Remove this class after resource requests become sufficiently | 32 // TODO(jdduke): Remove this class after resource requests become sufficiently |
30 // cheap on the IO thread, crbug.com/440037. | 33 // cheap on the IO thread, crbug.com/440037. |
31 class CONTENT_EXPORT ResourceDispatchThrottler : public IPC::Sender { | 34 class CONTENT_EXPORT ResourceDispatchThrottler : public IPC::Sender { |
32 public: | 35 public: |
33 // |flush_period| and |max_requests_per_flush| must be strictly positive | 36 // |flush_period| and |max_requests_per_flush| must be strictly positive |
34 // in duration/value. | 37 // in duration/value. |
35 ResourceDispatchThrottler(IPC::Sender* proxied_sender, | 38 ResourceDispatchThrottler(IPC::Sender* proxied_sender, |
36 scheduler::RendererScheduler* scheduler, | 39 scheduler::RendererScheduler* scheduler, |
37 base::TimeDelta flush_period, | 40 base::TimeDelta flush_period, |
38 uint32 max_requests_per_flush); | 41 uint32_t max_requests_per_flush); |
39 ~ResourceDispatchThrottler() override; | 42 ~ResourceDispatchThrottler() override; |
40 | 43 |
41 // IPC::Sender implementation: | 44 // IPC::Sender implementation: |
42 bool Send(IPC::Message* msg) override; | 45 bool Send(IPC::Message* msg) override; |
43 | 46 |
44 private: | 47 private: |
45 friend class ResourceDispatchThrottlerForTest; | 48 friend class ResourceDispatchThrottlerForTest; |
46 | 49 |
47 // Virtual for testing. | 50 // Virtual for testing. |
48 virtual base::TimeTicks Now() const; | 51 virtual base::TimeTicks Now() const; |
49 virtual void ScheduleFlush(); | 52 virtual void ScheduleFlush(); |
50 | 53 |
51 void Flush(); | 54 void Flush(); |
52 void FlushAll(); | 55 void FlushAll(); |
53 bool ForwardMessage(IPC::Message* msg); | 56 bool ForwardMessage(IPC::Message* msg); |
54 | 57 |
55 base::ThreadChecker thread_checker_; | 58 base::ThreadChecker thread_checker_; |
56 | 59 |
57 IPC::Sender* const proxied_sender_; | 60 IPC::Sender* const proxied_sender_; |
58 scheduler::RendererScheduler* const scheduler_; | 61 scheduler::RendererScheduler* const scheduler_; |
59 const base::TimeDelta flush_period_; | 62 const base::TimeDelta flush_period_; |
60 const uint32 max_requests_per_flush_; | 63 const uint32_t max_requests_per_flush_; |
61 | 64 |
62 base::Timer flush_timer_; | 65 base::Timer flush_timer_; |
63 base::TimeTicks last_sent_request_time_; | 66 base::TimeTicks last_sent_request_time_; |
64 uint32 sent_requests_since_last_flush_; | 67 uint32_t sent_requests_since_last_flush_; |
65 std::deque<IPC::Message*> throttled_messages_; | 68 std::deque<IPC::Message*> throttled_messages_; |
66 | 69 |
67 DISALLOW_COPY_AND_ASSIGN(ResourceDispatchThrottler); | 70 DISALLOW_COPY_AND_ASSIGN(ResourceDispatchThrottler); |
68 }; | 71 }; |
69 | 72 |
70 } // namespace content | 73 } // namespace content |
71 | 74 |
72 #endif // CONTENT_RENDERER_SCHEDULER_RESOURCE_DISPATCH_THROTTLER_H_ | 75 #endif // CONTENT_RENDERER_SCHEDULER_RESOURCE_DISPATCH_THROTTLER_H_ |
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