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- // Copyright (c) 2012 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_
- #include <stdint.h>
- #include "base/memory/raw_ptr.h"
- #include "base/memory/ref_counted.h"
- #include "base/memory/weak_ptr.h"
- #include "net/base/net_export.h"
- #include "net/base/rand_callback.h"
- #include "net/dns/dns_config.h"
- #include "net/dns/dns_udp_tracker.h"
- namespace net {
- class NetLog;
- // Session parameters and state shared between DnsTransactions for a specific
- // instance/version of a DnsConfig. Also may be used as a key handle for
- // per-session state stored elsewhere, e.g. in ResolveContext. A new DnsSession
- // should be created for each new DnsConfig for DnsTransactions to be based on
- // that new configuration.
- //
- // Ref-counted so that DnsTransactions can keep working in absence of
- // DnsClient or continue operating on the same session after DnsClient has moved
- // to a new DnsConfig/DnsSession.
- class NET_EXPORT_PRIVATE DnsSession : public base::RefCounted<DnsSession> {
- public:
- typedef base::RepeatingCallback<int()> RandCallback;
- DnsSession(const DnsConfig& config,
- const RandIntCallback& rand_int_callback,
- NetLog* net_log);
- DnsSession(const DnsSession&) = delete;
- DnsSession& operator=(const DnsSession&) = delete;
- const DnsConfig& config() const { return config_; }
- DnsUdpTracker* udp_tracker() { return &udp_tracker_; }
- NetLog* net_log() const { return net_log_; }
- // Return the next random query ID.
- uint16_t NextQueryId() const;
- base::WeakPtr<DnsSession> GetWeakPtr() {
- return weak_ptr_factory_.GetWeakPtr();
- }
- base::WeakPtr<const DnsSession> GetWeakPtr() const {
- return weak_ptr_factory_.GetWeakPtr();
- }
- void InvalidateWeakPtrsForTesting();
- private:
- friend class base::RefCounted<DnsSession>;
- ~DnsSession();
- const DnsConfig config_;
- DnsUdpTracker udp_tracker_;
- RandCallback rand_callback_;
- raw_ptr<NetLog> net_log_;
- mutable base::WeakPtrFactory<DnsSession> weak_ptr_factory_{this};
- };
- } // namespace net
- #endif // NET_DNS_DNS_SESSION_H_
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