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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 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 | 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 NET_QUIC_PORT_SUGGESTER_H_ | 5 #ifndef NET_QUIC_PORT_SUGGESTER_H_ |
6 #define NET_QUIC_PORT_SUGGESTER_H_ | 6 #define NET_QUIC_PORT_SUGGESTER_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include <stdint.h> |
| 9 |
| 10 #include "base/macros.h" |
9 #include "base/memory/ref_counted.h" | 11 #include "base/memory/ref_counted.h" |
10 #include "base/sha1.h" | 12 #include "base/sha1.h" |
11 #include "net/base/net_export.h" | 13 #include "net/base/net_export.h" |
12 | 14 |
13 namespace net { | 15 namespace net { |
14 | 16 |
15 class HostPortPair; | 17 class HostPortPair; |
16 | 18 |
17 // We provide a pseudo-random number generator that is always seeded the same | 19 // We provide a pseudo-random number generator that is always seeded the same |
18 // way for a given destination host-port pair. The generator is used to | 20 // way for a given destination host-port pair. The generator is used to |
19 // consistently suggest (for that host-port pair) an ephemeral source port, | 21 // consistently suggest (for that host-port pair) an ephemeral source port, |
20 // and hence increase the likelihood that a server's load balancer will direct | 22 // and hence increase the likelihood that a server's load balancer will direct |
21 // a repeated connection to the same server (with QUIC, further increasing the | 23 // a repeated connection to the same server (with QUIC, further increasing the |
22 // chance of connection establishment with 0-RTT). | 24 // chance of connection establishment with 0-RTT). |
23 class NET_EXPORT_PRIVATE PortSuggester | 25 class NET_EXPORT_PRIVATE PortSuggester |
24 : public base::RefCounted<PortSuggester> { | 26 : public base::RefCounted<PortSuggester> { |
25 public: | 27 public: |
26 PortSuggester(const HostPortPair& server, uint64 seed); | 28 PortSuggester(const HostPortPair& server, uint64_t seed); |
27 | 29 |
28 // Generate a pseudo-random int in the inclusive range from |min| to |max|. | 30 // Generate a pseudo-random int in the inclusive range from |min| to |max|. |
29 // Will (probably) return different numbers when called repeatedly. | 31 // Will (probably) return different numbers when called repeatedly. |
30 int SuggestPort(int min, int max); | 32 int SuggestPort(int min, int max); |
31 | 33 |
32 uint32 call_count() const { return call_count_; } | 34 uint32_t call_count() const { return call_count_; } |
33 int previous_suggestion() const; | 35 int previous_suggestion() const; |
34 | 36 |
35 private: | 37 private: |
36 friend class base::RefCounted<PortSuggester>; | 38 friend class base::RefCounted<PortSuggester>; |
37 | 39 |
38 virtual ~PortSuggester() {} | 40 virtual ~PortSuggester() {} |
39 | 41 |
40 // We maintain the first 8 bytes of a hash as our seed_ state. | 42 // We maintain the first 8 bytes of a hash as our seed_ state. |
41 uint64 seed_; | 43 uint64_t seed_; |
42 uint32 call_count_; // Number of suggestions made. | 44 uint32_t call_count_; // Number of suggestions made. |
43 int previous_suggestion_; | 45 int previous_suggestion_; |
44 | 46 |
45 DISALLOW_COPY_AND_ASSIGN(PortSuggester); | 47 DISALLOW_COPY_AND_ASSIGN(PortSuggester); |
46 }; | 48 }; |
47 | 49 |
48 } // namespace net | 50 } // namespace net |
49 | 51 |
50 #endif // NET_QUIC_PORT_SUGGESTER_H_ | 52 #endif // NET_QUIC_PORT_SUGGESTER_H_ |
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