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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef NET_DNS_DNS_SESSION_H_ | |
6 #define NET_DNS_DNS_SESSION_H_ | |
7 #pragma once | |
8 | |
9 #include "base/memory/ref_counted.h" | |
10 #include "base/memory/scoped_ptr.h" | |
11 #include "base/time.h" | |
12 #include "net/base/net_export.h" | |
13 #include "net/base/rand_callback.h" | |
14 #include "net/dns/dns_config_service.h" | |
15 | |
16 namespace net { | |
17 | |
18 class ClientSocketFactory; | |
19 class NetLog; | |
20 | |
21 // Session parameters and state shared between DNS transactions. | |
22 // Ref-counted so that DnsClient::Request can keep working in absence of | |
23 // DnsClient. | |
24 class NET_EXPORT_PRIVATE DnsSession | |
25 : NON_EXPORTED_BASE(public base::RefCounted<DnsSession>) { | |
26 public: | |
27 typedef base::Callback<int()> RandCallback; | |
28 | |
29 DnsSession(const DnsConfig& config, | |
30 ClientSocketFactory* factory, | |
31 const RandIntCallback& rand_int_callback, | |
32 NetLog* net_log); | |
33 | |
34 ClientSocketFactory* socket_factory() const { return socket_factory_.get(); } | |
35 const DnsConfig& config() const { return config_; } | |
36 NetLog* net_log() const { return net_log_; } | |
37 | |
38 // Return the next random query ID. | |
39 int NextId() const; | |
40 | |
41 // Return the next server address. | |
42 const IPEndPoint& NextServer(); | |
43 | |
44 // Return the timeout for the next transaction. | |
45 base::TimeDelta NextTimeout(int attempt); | |
46 | |
47 private: | |
48 friend class base::RefCounted<DnsSession>; | |
49 ~DnsSession(); | |
50 | |
51 DnsConfig config_; | |
mmenke
2011/12/02 00:53:55
It looks to me like your intention is to create a
szym
2011/12/05 23:06:28
Done.
| |
52 scoped_ptr<ClientSocketFactory> socket_factory_; | |
53 RandCallback rand_callback_; | |
54 NetLog* net_log_; | |
55 | |
56 // Current index into |config_.nameservers|. | |
57 int server_index_; | |
58 | |
59 // TODO(szym): add current RTT estimate | |
60 // TODO(szym): add flag to indicate DNSSEC is supported | |
61 // TODO(szym): add TCP connection pool to support DNS over TCP | |
62 // TODO(szym): add UDP socket pool ? | |
63 | |
64 DISALLOW_COPY_AND_ASSIGN(DnsSession); | |
65 }; | |
66 | |
67 } // namespace net | |
68 | |
69 #endif // NET_DNS_DNS_SESSION_H_ | |
70 | |
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