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1 // Copyright 2016 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 #include "net/base/network_throttle_manager.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "net/base/priority_queue.h" | |
9 | |
10 namespace net { | |
11 | |
12 namespace { | |
13 | |
14 class NetworkThrottleManagerImpl : public NetworkThrottleManager { | |
15 public: | |
16 class ThrottleImpl : public NetworkThrottleManager::Throttle { | |
17 public: | |
18 using QueuePointer = PriorityQueue<ThrottleImpl*>::Pointer; | |
19 | |
20 // Caller must arrange that |*delegate| and |*throttler| outlive | |
21 // the ThrottleImpl class. | |
22 ThrottleImpl(bool throttled, | |
23 RequestPriority priority, | |
24 ThrottleDelegate* delegate, | |
25 NetworkThrottleManagerImpl* throttler); | |
26 | |
27 ~ThrottleImpl() override; | |
28 | |
29 // Throttle | |
30 bool IsThrottled() const override; | |
31 void SetPriority(RequestPriority priority) override; | |
32 | |
33 QueuePointer queue_pointer() const { return queue_pointer_; } | |
34 void set_queue_pointer(const QueuePointer& pointer) { | |
35 queue_pointer_ = pointer; | |
36 } | |
37 | |
38 // Note that this call calls the delegate, and hence | |
39 // may result in re-entrant calls into the throttler or | |
40 // ThrottleImpl. The throttler should not rely on | |
41 // any state other than its own existence being persistent | |
42 // across this call. | |
43 void NotifyUnthrottled(); | |
44 | |
45 private: | |
46 bool throttled_; | |
47 ThrottleDelegate* const delegate_; | |
48 PriorityQueue<ThrottleImpl*>::Pointer queue_pointer_; | |
49 | |
50 NetworkThrottleManagerImpl* const throttler_; | |
51 | |
52 DISALLOW_COPY_AND_ASSIGN(ThrottleImpl); | |
53 }; | |
54 | |
55 NetworkThrottleManagerImpl(); | |
56 ~NetworkThrottleManagerImpl() override; | |
57 | |
58 std::unique_ptr<Throttle> CreateThrottle(ThrottleDelegate* delegate, | |
59 RequestPriority priority, | |
60 bool ignore_limits) override; | |
61 | |
62 private: | |
63 void OnStreamPriorityChanged(ThrottleImpl* throttle, | |
64 RequestPriority new_priority); | |
65 void OnStreamDestroyed(ThrottleImpl* throttle); | |
66 | |
67 PriorityQueue<ThrottleImpl*> priority_queue_; | |
68 | |
69 DISALLOW_COPY_AND_ASSIGN(NetworkThrottleManagerImpl); | |
70 }; | |
71 | |
72 // Currently this is a null implementation that does no throttling; | |
73 // all entries are created in the unthrottled state, and no throttle state | |
74 // change notifications are transmitted. | |
75 | |
76 NetworkThrottleManagerImpl::ThrottleImpl::ThrottleImpl( | |
77 bool throttled, | |
78 RequestPriority priority, | |
79 NetworkThrottleManager::ThrottleDelegate* delegate, | |
80 NetworkThrottleManagerImpl* throttler) | |
81 : throttled_(throttled), delegate_(delegate), throttler_(throttler) { | |
82 DCHECK(delegate); | |
83 } | |
84 | |
85 NetworkThrottleManagerImpl::ThrottleImpl::~ThrottleImpl() { | |
86 throttler_->OnStreamDestroyed(this); | |
87 } | |
88 | |
89 void NetworkThrottleManagerImpl::ThrottleImpl::SetPriority( | |
90 RequestPriority priority) { | |
91 throttler_->OnStreamPriorityChanged(this, priority); | |
92 } | |
93 | |
94 bool NetworkThrottleManagerImpl::ThrottleImpl::IsThrottled() const { | |
95 return throttled_; | |
96 } | |
97 | |
98 void NetworkThrottleManagerImpl::ThrottleImpl::NotifyUnthrottled() { | |
99 // This methods should only be called once, and only if the | |
100 // current state is throttled. | |
101 DCHECK(throttled_); | |
102 throttled_ = false; | |
103 delegate_->OnThrottleStateChanged(); | |
104 } | |
105 | |
106 NetworkThrottleManagerImpl::NetworkThrottleManagerImpl() | |
107 : priority_queue_(MAXIMUM_PRIORITY + 1) {} | |
108 | |
109 NetworkThrottleManagerImpl::~NetworkThrottleManagerImpl() {} | |
110 | |
111 std::unique_ptr<NetworkThrottleManager::Throttle> | |
112 NetworkThrottleManagerImpl::CreateThrottle( | |
113 NetworkThrottleManager::ThrottleDelegate* delegate, | |
114 RequestPriority priority, | |
115 bool ignore_limits) { | |
116 std::unique_ptr<NetworkThrottleManagerImpl::ThrottleImpl> stream( | |
117 new ThrottleImpl(false, priority, delegate, this)); | |
118 | |
119 stream->set_queue_pointer(priority_queue_.Insert(stream.get(), priority)); | |
120 | |
121 return std::move(stream); | |
122 } | |
123 | |
124 void NetworkThrottleManagerImpl::OnStreamPriorityChanged( | |
125 NetworkThrottleManagerImpl::ThrottleImpl* stream, | |
126 RequestPriority new_priority) { | |
127 priority_queue_.Erase(stream->queue_pointer()); | |
128 stream->set_queue_pointer(priority_queue_.Insert(stream, new_priority)); | |
129 } | |
130 | |
131 void NetworkThrottleManagerImpl::OnStreamDestroyed(ThrottleImpl* stream) { | |
132 priority_queue_.Erase(stream->queue_pointer()); | |
133 } | |
134 | |
135 } // namespace | |
136 | |
137 // static | |
138 std::unique_ptr<NetworkThrottleManager> | |
139 NetworkThrottleManager::CreateThrottler() { | |
140 return std::unique_ptr<NetworkThrottleManager>( | |
141 new NetworkThrottleManagerImpl); | |
142 } | |
143 | |
144 } // namespace net | |
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