Index: net/dns/dns_session.h |
diff --git a/net/dns/dns_session.h b/net/dns/dns_session.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..df986ea1b807fe3edad14d498ad0d9dfe57675e0 |
--- /dev/null |
+++ b/net/dns/dns_session.h |
@@ -0,0 +1,70 @@ |
+// Copyright (c) 2011 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef NET_DNS_DNS_SESSION_H_ |
+#define NET_DNS_DNS_SESSION_H_ |
+#pragma once |
+ |
+#include "base/memory/ref_counted.h" |
+#include "base/memory/scoped_ptr.h" |
+#include "base/time.h" |
+#include "net/base/net_export.h" |
+#include "net/base/rand_callback.h" |
+#include "net/dns/dns_config_service.h" |
+ |
+namespace net { |
+ |
+class ClientSocketFactory; |
+class NetLog; |
+ |
+// Session parameters and state shared between DNS transactions. |
+// Ref-counted so that DnsClient::Request can keep working in absence of |
+// DnsClient. A DnsSession must be recreated when DnsConfig changes. |
+class NET_EXPORT_PRIVATE DnsSession |
+ : NON_EXPORTED_BASE(public base::RefCounted<DnsSession>) { |
+ public: |
+ typedef base::Callback<int()> RandCallback; |
+ |
+ DnsSession(const DnsConfig& config, |
+ ClientSocketFactory* factory, |
+ const RandIntCallback& rand_int_callback, |
+ NetLog* net_log); |
+ |
+ ClientSocketFactory* socket_factory() const { return socket_factory_.get(); } |
+ const DnsConfig& config() const { return config_; } |
+ NetLog* net_log() const { return net_log_; } |
+ |
+ // Return the next random query ID. |
+ int NextId() const; |
+ |
+ // Return the next server address. |
+ const IPEndPoint& NextServer(); |
+ |
+ // Return the timeout for the next transaction. |
+ base::TimeDelta NextTimeout(int attempt); |
+ |
+ private: |
+ friend class base::RefCounted<DnsSession>; |
+ ~DnsSession(); |
+ |
+ const DnsConfig config_; |
+ scoped_ptr<ClientSocketFactory> socket_factory_; |
+ RandCallback rand_callback_; |
+ NetLog* net_log_; |
+ |
+ // Current index into |config_.nameservers|. |
+ int server_index_; |
+ |
+ // TODO(szym): add current RTT estimate |
+ // TODO(szym): add flag to indicate DNSSEC is supported |
+ // TODO(szym): add TCP connection pool to support DNS over TCP |
+ // TODO(szym): add UDP socket pool ? |
+ |
+ DISALLOW_COPY_AND_ASSIGN(DnsSession); |
+}; |
+ |
+} // namespace net |
+ |
+#endif // NET_DNS_DNS_SESSION_H_ |
+ |