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// Copyright (c) 2015 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.
// A map manages packets which are transmitted across multiple paths.
// For example, a packet is originally transmitted on path 1 with packet number
// 1. Then this packet is retransmitted on path 2 with packet number 1. (1, 1)
// and (2, 1) are inserted into this map. Suppose (2, 1) is detected lost and
// gets retransmitted on path 2 with packet 2. (2, 2) will not be inserted
// because this transmission does not "across" path compared to (2, 1).
#ifndef NET_QUIC_QUIC_MULTIPATH_TRANSMISSIONS_MAP_H_
#define NET_QUIC_QUIC_MULTIPATH_TRANSMISSIONS_MAP_H_
#include <deque>
#include <unordered_map>
#include "base/containers/hash_tables.h"
#include "base/macros.h"
#include "net/quic/quic_protocol.h"
#include "net/quic/quic_utils.h"
namespace net {
typedef std::pair<QuicPathId, QuicPacketNumber> QuicPathIdPacketNumber;
class NET_EXPORT_PRIVATE QuicMultipathTransmissionsMap {
public:
struct QuicPathIdPacketNumberHash {
size_t operator()(std::pair<QuicPathId, QuicPacketNumber> value) const {
return QuicUtils::PackPathIdAndPacketNumber(value.first, value.second);
}
};
typedef std::deque<QuicPathIdPacketNumber> MultipathTransmissionsList;
typedef std::unordered_map<QuicPathIdPacketNumber,
MultipathTransmissionsList*,
QuicPathIdPacketNumberHash>
MultipathTransmissionsMap;
QuicMultipathTransmissionsMap();
~QuicMultipathTransmissionsMap();
// Called when a packet is retransmitted on a different path. Adds both
// |original_path_id_packet_number| (if not exists) and
// |path_id_packet_number| to |transmission_map_|.
void OnPacketRetransmittedOnDifferentPath(
QuicPathIdPacketNumber original_path_id_packet_number,
QuicPathIdPacketNumber path_id_packet_number);
// Returns all multipath transmissions list if |path_id_packet_number| has
// been transmitted across multiple paths, nullptr otherwise.
const MultipathTransmissionsList* MaybeGetTransmissionsOnOtherPaths(
QuicPathIdPacketNumber path_id_packet_number) const;
// Called after packet |path_id_packet_number| is received.
// If |path_id_packet_number| has been transmitted across multiple paths,
// clears all multipath transmissions list and removes each transmission from
// |transmission_map_|, does nothing otherwise.
void OnPacketHandled(QuicPathIdPacketNumber path_id_packet_number);
private:
// Keys of the map are QuicPathIdPacketNumber, and values are pointers to
// lists of multipath transmissions of the same packet. For example, if a
// packet has been transmitted as (1, 1) and (2, 1), two entries are added
// to this map and both values point to the same list: {(1, 1), (2, 1)}.
// The MultipathTransmissionsList is owned by the transmission which is
// received first (on any path).
MultipathTransmissionsMap transmission_map_;
};
} // namespace net
#endif // NET_QUIC_QUIC_MULTIPATH_TRANSMISSIONS_MAP_H_
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