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d7bfb9b0 JG |
1 | /* |
2 | * Copyright (C) 2022 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #ifndef LTTNG_UST_REGISTRY_CHANNEL_H | |
9 | #define LTTNG_UST_REGISTRY_CHANNEL_H | |
10 | ||
11 | #include "stream-class.hpp" | |
12 | ||
13 | #include <common/hashtable/hashtable.hpp> | |
14 | ||
15 | #include <lttng/lttng.h> | |
16 | ||
17 | #include <urcu.h> | |
18 | #include <functional> | |
19 | ||
20 | struct ust_app; | |
21 | ||
22 | namespace lttng { | |
23 | namespace sessiond { | |
24 | namespace ust { | |
25 | ||
26 | class registry_event; | |
27 | ||
28 | class registry_channel : public lttng::sessiond::trace::stream_class { | |
29 | public: | |
30 | using registered_listener_fn = std::function<void(const registry_channel&)>; | |
31 | using event_added_listener_fn = std::function<void(const registry_channel&, const registry_event &)>; | |
32 | ||
33 | registry_channel(uint32_t channel_id, | |
34 | registered_listener_fn channel_registered_listener, | |
35 | event_added_listener_fn new_event_listener); | |
36 | void add_event(int session_objd, | |
37 | int channel_objd, | |
38 | std::string name, | |
39 | std::string signature, | |
40 | std::vector<lttng::sessiond::trace::field::cuptr> event_fields, | |
41 | int loglevel_value, | |
42 | nonstd::optional<std::string> model_emf_uri, | |
43 | lttng_buffer_type buffer_type, | |
44 | const ust_app& app, | |
45 | uint32_t& out_event_id); | |
46 | virtual ~registry_channel(); | |
47 | ||
48 | virtual const lttng::sessiond::trace::type& get_context() const override final; | |
49 | void set_context(lttng::sessiond::trace::type::cuptr context); | |
50 | ||
51 | /* Channel was registered to at least one application. */ | |
52 | bool is_registered() const; | |
53 | void set_as_registered(); | |
54 | ||
55 | uint64_t _key; | |
56 | uint64_t _consumer_key; | |
57 | ||
58 | /* | |
59 | * Flag for this channel if the metadata was dumped once during | |
60 | * registration. 0 means no, 1 yes. | |
61 | */ | |
62 | unsigned int _metadata_dumped; | |
63 | ||
64 | /* | |
65 | * Hash table containing events sent by the UST tracer. MUST be accessed | |
66 | * with a RCU read side lock acquired. | |
67 | */ | |
68 | struct lttng_ht *_events; | |
69 | struct lttng_ht_node_u64 _node; | |
70 | /* For delayed reclaim */ | |
71 | struct rcu_head _rcu_head; | |
72 | /* Once this value reaches UINT32_MAX, no more id can be allocated. */ | |
73 | uint32_t _next_event_id; | |
74 | ||
75 | private: | |
76 | virtual void _accept_on_event_classes( | |
77 | lttng::sessiond::trace::trace_class_visitor& trace_class_visitor) const override final; | |
78 | ||
79 | registered_listener_fn _is_registered_listener; | |
80 | event_added_listener_fn _event_added_listener; | |
81 | /* Indicates if this channel registry has already been registered. */ | |
82 | bool _is_registered; | |
83 | }; | |
84 | ||
85 | } /* namespace ust */ | |
86 | } /* namespace sessiond */ | |
87 | } /* namespace lttng */ | |
88 | ||
89 | #endif /* LTTNG_UST_REGISTRY_CHANNEL_H */ |