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1 // Copyright (c) 2012 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 // DuplicateContentResourceHandler keeps a hash of resources seen and based on | |
6 // url. It is an experiment meant to simulate cache hits for both a url-based | |
7 // and content-based cache. | |
gavinp
2012/07/31 19:26:18
"and a content-based cache."
frankwang
2012/07/31 20:26:18
Done.
| |
8 | |
9 #ifndef CONTENT_BROWSER_RENDERER_HOST_DUPLICATE_CONTENT_RESOURCE_HANDLER_H_ | |
10 #define CONTENT_BROWSER_RENDERER_HOST_DUPLICATE_CONTENT_RESOURCE_HANDLER_H_ | |
11 | |
12 #include <string> | |
13 | |
14 #include "base/memory/ref_counted.h" | |
15 #include "content/browser/renderer_host/layered_resource_handler.h" | |
16 #include "third_party/smhasher/src/PMurHash.h" | |
17 #include "webkit/glue/resource_type.h" | |
18 | |
19 namespace net { | |
20 class IOBuffer; | |
21 class URLRequest; | |
22 class URLRequestStatus; | |
23 } | |
24 | |
25 namespace content { | |
26 | |
27 class DuplicateContentResourceHandler: public LayeredResourceHandler { | |
28 public: | |
29 DuplicateContentResourceHandler(scoped_ptr<ResourceHandler> next_handler, | |
30 ResourceType::Type resource_type, | |
31 net::URLRequest* request); | |
32 virtual ~DuplicateContentResourceHandler(); | |
33 | |
34 private: | |
35 // ResourceHandler implementation | |
36 virtual bool OnWillRead(int request_id, | |
37 net::IOBuffer** buf, | |
38 int* buf_size, | |
39 int min_size) OVERRIDE; | |
40 virtual bool OnReadCompleted(int request_id, | |
41 int bytes_read, | |
42 bool* defer) OVERRIDE; | |
43 virtual bool OnResponseCompleted(int request_id, | |
44 const net::URLRequestStatus& status, | |
45 const std::string& security_info) OVERRIDE; | |
46 | |
47 void RecordContentMetrics(); | |
48 | |
49 ResourceType::Type resource_type_; | |
50 int bytes_read_; | |
51 scoped_refptr<net::IOBuffer> read_buffer_; | |
52 net::URLRequest* request_; | |
53 | |
54 // These values are temporary values that are used in each digest of the | |
55 // inputs for the incremental hash (PMurHash). | |
56 MH_UINT32 pmurhash_ph1_; | |
57 MH_UINT32 pmurhash_pcarry_; | |
58 | |
59 DISALLOW_COPY_AND_ASSIGN(DuplicateContentResourceHandler); | |
60 }; | |
61 | |
62 } // namespace content | |
63 | |
64 #endif // CONTENT_BROWSER_RENDERER_HOST_DUPLICATE_CONTENT_RESOURCE_HANDLER_H_ | |
65 | |
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