src/bin/lttng-sessiond/stream-class.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_STREAM_CLASS_H
   9 #define LTTNG_STREAM_CLASS_H
  10
  11 #include "field.hpp"
  12
  13 #include <vector>
  14
  15 namespace lttng {
  16 namespace sessiond {
  17 namespace trace {
  18
  19 class trace_class_visitor;
  20
  21 class stream_class {
  22 public:
  23         enum class header_type { COMPACT, LARGE };
  24
  25         /*
  26          * Derived classes must implement _accept_on_event_classes()
  27          * to continue the traversal to the stream class' event classes.
  28          */
  29         void accept(trace_class_visitor& visitor) const;
  30         virtual ~stream_class() = default;
  31
  32         virtual const lttng::sessiond::trace::type& get_context() const;
  33
  34         const unsigned int id;
  35         /*
  36          * header_type is suffixed with '_' to work-around a bug in older
  37          * GCCs (before 6) that do not recognize hidden/shadowed enumeration as valid
  38          * nested-name-specifiers.
  39          */
  40         const header_type header_type_;
  41
  42 protected:
  43         stream_class(unsigned int id, enum header_type header_type);
  44         virtual void _accept_on_event_classes(trace_class_visitor& trace_class_visitor) const = 0;
  45
  46         lttng::sessiond::trace::type::cuptr _context;
  47 };
  48
  49 } /* namespace trace */
  50 } /* namespace sessiond */
  51 } /* namespace lttng */
  52
  53 #endif /* LTTNG_STREAM_CLASS_H */