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a56fcf0b | 1 | /* |
77b1029d | 2 | * Copyright (C) 1996-2020 The Squid Software Foundation and contributors |
a56fcf0b CT |
3 | * |
4 | * Squid software is distributed under GPLv2+ license and includes | |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
7 | */ | |
8 | ||
9 | #ifndef _SQUID_SRC_HELPER_RESERVATIONID_H | |
10 | #define _SQUID_SRC_HELPER_RESERVATIONID_H | |
11 | ||
12 | #include <ostream> | |
13 | ||
14 | namespace Helper | |
15 | { | |
16 | /// a (temporary) lock on a (stateful) helper channel | |
17 | class ReservationId | |
18 | { | |
19 | public: | |
20 | static ReservationId Next(); | |
21 | ||
22 | bool reserved() const { return id > 0; } | |
23 | ||
24 | explicit operator bool() const { return reserved(); } | |
25 | bool operator !() const { return !reserved(); } | |
26 | bool operator ==(const Helper::ReservationId &other) const { return id == other.id; } | |
27 | bool operator !=(const Helper::ReservationId &other) const { return !(*this == other); } | |
28 | ||
29 | void clear() { id = 0; } | |
30 | uint64_t value() const {return id;} | |
31 | ||
32 | /// dumps the reservation info for debugging | |
33 | std::ostream &print(std::ostream &os) const; | |
34 | ||
35 | private: | |
36 | uint64_t id = 0; ///< uniquely identifies this reservation | |
37 | }; | |
38 | ||
39 | }; // namespace Helper | |
40 | ||
41 | inline std::ostream & | |
42 | operator <<(std::ostream &os, const Helper::ReservationId &id) | |
43 | { | |
44 | return id.print(os); | |
45 | } | |
46 | ||
47 | namespace std { | |
48 | /// default hash functor to support std::unordered_map<HelperReservationId, *> | |
49 | template <> | |
50 | struct hash<Helper::ReservationId> | |
51 | { | |
52 | typedef Helper::ReservationId argument_type; | |
53 | typedef std::size_t result_type; | |
54 | result_type operator()(const argument_type &reservation) const noexcept | |
55 | { | |
56 | std::hash<uint64_t> aHash; | |
57 | return aHash(reservation.value()); | |
58 | } | |
59 | }; | |
60 | } | |
61 | ||
62 | #endif | |
8baed639 | 63 |