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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 #ifndef NET_DNS_ADDRESS_SORTER_H_ | |
| 6 #define NET_DNS_ADDRESS_SORTER_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/callback.h" | |
| 10 #include "base/memory/scoped_ptr.h" | |
| 11 #include "net/base/net_export.h" | |
| 12 | |
| 13 namespace net { | |
| 14 | |
| 15 class AddressList; | |
| 16 | |
| 17 // Sorts AddressList according to RFC3484, by likelihood of successful | |
| 18 // connection. Depending on the platform, the sort could be performed | |
| 19 // asynchronously by the OS, or synchronously by local implementation. | |
| 20 // AddressSorter does not necessarily preserve port numbers on the sorted list. | |
| 21 class NET_EXPORT AddressSorter { | |
| 22 public: | |
| 23 typedef base::Callback<void(bool success, | |
| 24 const AddressList& list)> CallbackType; | |
| 25 | |
| 26 virtual ~AddressSorter() {} | |
| 27 | |
| 28 // Sorts |list|, which must include at least one IPv6 address. | |
| 29 // Calls |callback| upon completion. Could complete synchronously. Could | |
| 30 // complete after this AddressSorter is destroyed. | |
| 31 virtual void Sort(const AddressList& list, | |
| 32 const CallbackType& callback) const = 0; | |
| 33 | |
| 34 // Creates platform-dependent AddressSorter. | |
| 35 static scoped_ptr<AddressSorter> CreateAddressSorter(); | |
| 36 | |
| 37 protected: | |
| 38 AddressSorter() {} | |
| 39 | |
| 40 private: | |
| 41 DISALLOW_COPY_AND_ASSIGN(AddressSorter); | |
| 42 }; | |
| 43 | |
| 44 } // namespace net | |
| 45 | |
| 46 #endif // NET_DNS_ADDRESS_SORTER_H_ | |
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