src/bin/lttng-sessiond/tsdl-trace-class-visitor.hpp

   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_TSDL_TRACE_CLASS_VISITOR_H
   9 #define LTTNG_TSDL_TRACE_CLASS_VISITOR_H
  10
  11 #include "trace-class.hpp"
  12 #include "stream-class.hpp"
  13 #include "event-class.hpp"
  14
  15 #include <vendor/optional.hpp>
  16
  17 #include <functional>
  18
  19 namespace lttng {
  20 namespace sessiond {
  21 namespace tsdl {
  22
  23 using append_metadata_fragment_function = std::function<void(const std::string& fragment)>;
  24
  25 class trace_class_visitor : public lttng::sessiond::trace::trace_class_visitor {
  26 public:
  27         trace_class_visitor(const lttng::sessiond::trace::abi& trace_abi,
  28                         append_metadata_fragment_function append_metadata);
  29
  30         /* trace class visitor interface. */
  31         virtual void visit(const lttng::sessiond::trace::trace_class& trace_class) override final;
  32
  33         /* clock class visitor interface. */
  34         virtual void visit(const lttng::sessiond::trace::clock_class& clock_class) override final;
  35
  36         /* environment visitor interface. */
  37         virtual void environment_begin() override final;
  38         virtual void visit(const lttng::sessiond::trace::environment_field<int64_t>& field) override final;
  39         virtual void visit(const lttng::sessiond::trace::environment_field<const char *>& field) override final;
  40         virtual void environment_end() override final;
  41
  42         /* stream class visitor interface. */
  43         virtual void visit(const lttng::sessiond::trace::stream_class& stream_class) override final;
  44
  45         /* event class visitor interface. */
  46         virtual void visit(const lttng::sessiond::trace::event_class& event_class) override final;
  47
  48 private:
  49         /* Coherent (parseable) fragments must be appended. */
  50         void append_metadata_fragment(const std::string& fragment) const;
  51
  52         const lttng::sessiond::trace::abi& _trace_abi;
  53         const append_metadata_fragment_function _append_metadata_fragment;
  54         std::string _environment;
  55 };
  56
  57 } /* namespace tsdl */
  58 } /* namespace sessiond */
  59 } /* namespace lttng */
  60
  61 #endif /* LTTNG_TSDL_TRACE_CLASS_VISITOR_H */