src/cpp-common/bt2/graph.hpp

   1 /*
   2  * Copyright (c) 2024 EfficiOS, Inc.
   3  *
   4  * SPDX-License-Identifier: MIT
   5  */
   6
   7 #ifndef BABELTRACE_CPP_COMMON_BT2_GRAPH_HPP
   8 #define BABELTRACE_CPP_COMMON_BT2_GRAPH_HPP
   9
  10 #include <cstdint>
  11
  12 #include <babeltrace2/babeltrace.h>
  13
  14 #include "borrowed-object.hpp"
  15 #include "component-class.hpp"
  16 #include "exc.hpp"
  17 #include "shared-object.hpp"
  18
  19 namespace bt2 {
  20 namespace internal {
  21
  22 struct GraphRefFuncs final
  23 {
  24     static void get(const bt_graph * const libObjPtr) noexcept
  25     {
  26         bt_graph_get_ref(libObjPtr);
  27     }
  28
  29     static void put(const bt_graph * const libObjPtr) noexcept
  30     {
  31         bt_graph_put_ref(libObjPtr);
  32     }
  33 };
  34
  35 } /* namespace internal */
  36
  37 class Graph final : public BorrowedObject<bt_graph>
  38 {
  39 public:
  40     using Shared = SharedObject<Graph, bt_graph, internal::GraphRefFuncs>;
  41
  42     explicit Graph(const LibObjPtr libObjPtr) noexcept : _ThisBorrowedObject {libObjPtr}
  43     {
  44     }
  45
  46     static Shared create(const std::uint64_t mipVersion)
  47     {
  48         const auto libObjPtr = bt_graph_create(mipVersion);
  49
  50         if (!libObjPtr) {
  51             throw MemoryError {};
  52         }
  53
  54         return Shared::createWithoutRef(libObjPtr);
  55     }
  56
  57     ConstSourceComponent addComponent(const ConstSourceComponentClass componentClass,
  58                                       const bt2c::CStringView name,
  59                                       const OptionalBorrowedObject<ConstMapValue> params = {},
  60                                       const LoggingLevel loggingLevel = LoggingLevel::None) const
  61     {
  62         return this->_addComponent<ConstSourceComponent>(
  63             componentClass, name, params, static_cast<void *>(nullptr), loggingLevel,
  64             bt_graph_add_source_component_with_initialize_method_data);
  65     }
  66
  67     template <typename InitDataT>
  68     ConstSourceComponent addComponent(const ConstSourceComponentClass componentClass,
  69                                       const bt2c::CStringView name, InitDataT&& initData,
  70                                       const OptionalBorrowedObject<ConstMapValue> params = {},
  71                                       const LoggingLevel loggingLevel = LoggingLevel::None) const
  72     {
  73         return this->_addComponent<ConstSourceComponent>(
  74             componentClass, name, params, &initData, loggingLevel,
  75             bt_graph_add_source_component_with_initialize_method_data);
  76     }
  77
  78     ConstFilterComponent addComponent(const ConstFilterComponentClass componentClass,
  79                                       const bt2c::CStringView name,
  80                                       const OptionalBorrowedObject<ConstMapValue> params = {},
  81                                       const LoggingLevel loggingLevel = LoggingLevel::None) const
  82     {
  83         return this->_addComponent<ConstFilterComponent>(
  84             componentClass, name, params, static_cast<void *>(nullptr), loggingLevel,
  85             bt_graph_add_filter_component_with_initialize_method_data);
  86     }
  87
  88     template <typename InitDataT>
  89     ConstFilterComponent addComponent(const ConstFilterComponentClass componentClass,
  90                                       const bt2c::CStringView name, InitDataT&& initData,
  91                                       const OptionalBorrowedObject<ConstMapValue> params = {},
  92                                       const LoggingLevel loggingLevel = LoggingLevel::None) const
  93     {
  94         return this->_addComponent<ConstFilterComponent>(
  95             componentClass, name, params, &initData, loggingLevel,
  96             bt_graph_add_filter_component_with_initialize_method_data);
  97     }
  98
  99     ConstSinkComponent addComponent(const ConstSinkComponentClass componentClass,
 100                                     const bt2c::CStringView name,
 101                                     const OptionalBorrowedObject<ConstMapValue> params = {},
 102                                     const LoggingLevel loggingLevel = LoggingLevel::None) const
 103     {
 104         return this->_addComponent<ConstSinkComponent>(
 105             componentClass, name, params, static_cast<void *>(nullptr), loggingLevel,
 106             bt_graph_add_sink_component_with_initialize_method_data);
 107     }
 108
 109     template <typename InitDataT>
 110     ConstSinkComponent addComponent(const ConstSinkComponentClass componentClass,
 111                                     const bt2c::CStringView name, InitDataT&& initData,
 112                                     const OptionalBorrowedObject<ConstMapValue> params = {},
 113                                     const LoggingLevel loggingLevel = LoggingLevel::None) const
 114     {
 115         return this->_addComponent<ConstSinkComponent>(
 116             componentClass, name, params, &initData, loggingLevel,
 117             bt_graph_add_sink_component_with_initialize_method_data);
 118     }
 119
 120     Graph connectPorts(const ConstOutputPort outputPort, const ConstInputPort inputPort) const
 121     {
 122         const auto status = bt_graph_connect_ports(this->libObjPtr(), outputPort.libObjPtr(),
 123                                                    inputPort.libObjPtr(), nullptr);
 124
 125         if (status == BT_GRAPH_CONNECT_PORTS_STATUS_ERROR) {
 126             throw Error {};
 127         } else if (status == BT_GRAPH_CONNECT_PORTS_STATUS_MEMORY_ERROR) {
 128             throw MemoryError {};
 129         }
 130
 131         return *this;
 132     }
 133
 134     Graph runOnce() const
 135     {
 136         const auto status = bt_graph_run_once(this->libObjPtr());
 137
 138         if (status == BT_GRAPH_RUN_ONCE_STATUS_ERROR) {
 139             throw Error {};
 140         } else if (status == BT_GRAPH_RUN_ONCE_STATUS_MEMORY_ERROR) {
 141             throw MemoryError {};
 142         } else if (status == BT_GRAPH_RUN_ONCE_STATUS_AGAIN) {
 143             throw TryAgain {};
 144         }
 145
 146         return *this;
 147     }
 148
 149     Graph run() const
 150     {
 151         const auto status = bt_graph_run(this->libObjPtr());
 152
 153         if (status == BT_GRAPH_RUN_STATUS_ERROR) {
 154             throw Error {};
 155         } else if (status == BT_GRAPH_RUN_STATUS_MEMORY_ERROR) {
 156             throw MemoryError {};
 157         } else if (status == BT_GRAPH_RUN_STATUS_AGAIN) {
 158             throw TryAgain {};
 159         }
 160
 161         return *this;
 162     }
 163
 164 private:
 165     template <typename ConstComponentT, typename ConstComponentClassT, typename InitDataT,
 166               typename AddFuncT>
 167     ConstComponentT
 168     _addComponent(const ConstComponentClassT componentClass, const bt2c::CStringView name,
 169                   const OptionalBorrowedObject<ConstMapValue> params, InitDataT * const initData,
 170                   const LoggingLevel loggingLevel, AddFuncT&& addFunc) const
 171     {
 172         typename ConstComponentT::LibObjPtr libObjPtr = nullptr;
 173
 174         const auto status = addFunc(this->libObjPtr(), componentClass.libObjPtr(), name,
 175                                     params ? params->libObjPtr() : nullptr,
 176                                     const_cast<void *>(static_cast<const void *>(initData)),
 177                                     static_cast<bt_logging_level>(loggingLevel), &libObjPtr);
 178
 179         if (status == BT_GRAPH_ADD_COMPONENT_STATUS_ERROR) {
 180             throw Error {};
 181         } else if (status == BT_GRAPH_ADD_COMPONENT_STATUS_MEMORY_ERROR) {
 182             throw MemoryError {};
 183         }
 184
 185         return ConstComponentT {libObjPtr};
 186     }
 187 };
 188
 189 } /* namespace bt2 */
 190
 191 #endif /* BABELTRACE_CPP_COMMON_BT2_GRAPH_HPP */