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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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_BROWSER_RENDERER_HOST_RESOURCE_QUEUE_H_ | 5 #ifndef CONTENT_BROWSER_RENDERER_HOST_RESOURCE_QUEUE_H_ |
6 #define CONTENT_BROWSER_RENDERER_HOST_RESOURCE_QUEUE_H_ | 6 #define CONTENT_BROWSER_RENDERER_HOST_RESOURCE_QUEUE_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <map> | 9 #include <map> |
10 #include <set> | 10 #include <set> |
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21 struct GlobalRequestID; | 21 struct GlobalRequestID; |
22 | 22 |
23 // Makes decisions about delaying or not each net::URLRequest in the queue. | 23 // Makes decisions about delaying or not each net::URLRequest in the queue. |
24 // All methods are called on the IO thread. | 24 // All methods are called on the IO thread. |
25 class CONTENT_EXPORT ResourceQueueDelegate { | 25 class CONTENT_EXPORT ResourceQueueDelegate { |
26 public: | 26 public: |
27 // Gives the delegate a pointer to the queue object. | 27 // Gives the delegate a pointer to the queue object. |
28 virtual void Initialize(ResourceQueue* resource_queue) = 0; | 28 virtual void Initialize(ResourceQueue* resource_queue) = 0; |
29 | 29 |
30 // Should return true if it wants the |request| to not be started at this | 30 // Should return true if it wants the |request| to not be started at this |
31 // point. To start the delayed request, ResourceQueue::StartDelayedRequest | 31 // point. Use ResourceQueue::StartDelayedRequests to restart requests. |
32 // should be used. | |
33 virtual bool ShouldDelayRequest( | 32 virtual bool ShouldDelayRequest( |
34 net::URLRequest* request, | 33 net::URLRequest* request, |
35 const ResourceDispatcherHostRequestInfo& request_info, | 34 const ResourceDispatcherHostRequestInfo& request_info, |
36 const GlobalRequestID& request_id) = 0; | 35 const GlobalRequestID& request_id) = 0; |
37 | 36 |
38 // Called just before ResourceQueue shutdown. After that, the delegate | 37 // Called just before ResourceQueue shutdown. After that, the delegate |
39 // should not use the ResourceQueue. | 38 // should not use the ResourceQueue. |
40 virtual void WillShutdownResourceQueue() = 0; | 39 virtual void WillShutdownResourceQueue() = 0; |
41 | 40 |
42 protected: | 41 protected: |
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67 | 66 |
68 // Takes care to start the |request| after all delegates allow that. If no | 67 // Takes care to start the |request| after all delegates allow that. If no |
69 // delegate demands delaying the request it will be started immediately. | 68 // delegate demands delaying the request it will be started immediately. |
70 void AddRequest(net::URLRequest* request, | 69 void AddRequest(net::URLRequest* request, |
71 const ResourceDispatcherHostRequestInfo& request_info); | 70 const ResourceDispatcherHostRequestInfo& request_info); |
72 | 71 |
73 // Tells the queue that the net::URLRequest object associated with | 72 // Tells the queue that the net::URLRequest object associated with |
74 // |request_id| is no longer valid. | 73 // |request_id| is no longer valid. |
75 void RemoveRequest(const GlobalRequestID& request_id); | 74 void RemoveRequest(const GlobalRequestID& request_id); |
76 | 75 |
77 // A delegate should call StartDelayedRequest when it wants to allow the | 76 // A delegate should call StartDelayedRequests when it wants to allow all |
78 // request to start. If it was the last delegate that demanded the request | 77 // its delayed requests to start. If it was the last delegate that required |
79 // to be delayed, the request will be started. | 78 // a request to be delayed, that request will be started. |
80 void StartDelayedRequest(ResourceQueueDelegate* delegate, | 79 void StartDelayedRequests(ResourceQueueDelegate* delegate); |
81 const GlobalRequestID& request_id); | |
82 | 80 |
83 private: | 81 private: |
84 typedef std::map<GlobalRequestID, net::URLRequest*> RequestMap; | 82 typedef std::map<GlobalRequestID, net::URLRequest*> RequestMap; |
85 typedef std::map<GlobalRequestID, DelegateSet> InterestedDelegatesMap; | 83 typedef std::map<GlobalRequestID, DelegateSet> InterestedDelegatesMap; |
86 | 84 |
87 // The registered delegates. Will not change after the queue has been | 85 // The registered delegates. Will not change after the queue has been |
88 // initialized. | 86 // initialized. |
89 DelegateSet delegates_; | 87 DelegateSet delegates_; |
90 | 88 |
91 // Stores net::URLRequest objects associated with each GlobalRequestID. This | 89 // Stores net::URLRequest objects associated with each GlobalRequestID. This |
92 // helps decoupling the queue from ResourceDispatcherHost. | 90 // helps decoupling the queue from ResourceDispatcherHost. |
93 RequestMap requests_; | 91 RequestMap requests_; |
94 | 92 |
95 // Maps a GlobalRequestID to the set of delegates that want to prevent the | 93 // Maps a GlobalRequestID to the set of delegates that want to prevent the |
96 // associated request from starting yet. | 94 // associated request from starting yet. |
97 InterestedDelegatesMap interested_delegates_; | 95 InterestedDelegatesMap interested_delegates_; |
98 | 96 |
99 // True when we are shutting down. | 97 // True when we are shutting down. |
100 bool shutdown_; | 98 bool shutdown_; |
101 | 99 |
102 DISALLOW_COPY_AND_ASSIGN(ResourceQueue); | 100 DISALLOW_COPY_AND_ASSIGN(ResourceQueue); |
103 }; | 101 }; |
104 | 102 |
105 #endif // CONTENT_BROWSER_RENDERER_HOST_RESOURCE_QUEUE_H_ | 103 #endif // CONTENT_BROWSER_RENDERER_HOST_RESOURCE_QUEUE_H_ |
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