2 * Copyright (C) 2022 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: GPL-2.0-only
8 #ifndef LTTNG_TRACE_CLASS_H
9 #define LTTNG_TRACE_CLASS_H
11 #include <common/uuid.hpp>
20 class trace_class_visitor;
22 enum class byte_order {
28 unsigned int bits_per_long;
29 unsigned int long_alignment;
30 unsigned int uint8_t_alignment;
31 unsigned int uint16_t_alignment;
32 unsigned int uint32_t_alignment;
33 unsigned int uint64_t_alignment;
34 enum byte_order byte_order;
37 template <class ValueType>
38 class environment_field {
40 environment_field(const char *in_name, const ValueType& in_value) :
41 name(in_name), value(in_value)
45 const char * const name;
46 const ValueType& value;
52 * Derived classes must implement the _accept_on_*()
53 * to continue the traversal to the trace class' children.
55 virtual void accept(trace_class_visitor& trace_class_visitor) const;
57 virtual ~trace_class() = default;
60 const lttng_uuid uuid;
63 trace_class(const struct abi& abi, const lttng_uuid& trace_uuid);
64 virtual void _accept_on_clock_classes(trace_class_visitor& trace_class_visitor) const = 0;
65 virtual void _visit_environment(trace_class_visitor& trace_class_visitor) const = 0;
66 virtual void _accept_on_stream_classes(trace_class_visitor& trace_class_visitor) const = 0;
69 class trace_class_visitor {
71 using cuptr = std::unique_ptr<trace_class_visitor>;
73 virtual ~trace_class_visitor() = default;
75 /* trace class visitor interface. */
76 virtual void visit(const lttng::sessiond::trace::trace_class& trace_class) = 0;
78 /* clock class visitor interface. */
79 virtual void visit(const lttng::sessiond::trace::clock_class& clock_class) = 0;
81 /* environment visitor interface. */
82 virtual void environment_begin() = 0;
83 virtual void visit(const environment_field<int64_t>& field) = 0;
84 virtual void visit(const environment_field<const char *>& field) = 0;
85 void visit(const environment_field<std::string>& field);
86 virtual void environment_end() = 0;
88 /* stream class visitor interface. */
89 virtual void visit(const lttng::sessiond::trace::stream_class& stream_class) = 0;
91 /* event class visitor interface. */
92 virtual void visit(const lttng::sessiond::trace::event_class& event_class) = 0;
95 } /* namespace trace */
96 } /* namespace sessiond */
97 } /* namespace lttng */
99 #endif /* LTTNG_TRACE_CLASS_H */