Update graph destructor

* Fix graph manager datawriters

Fixes

Fix

Fix destruction

* Revert "Fix graph manager datawriters"

This reverts commit 2847a2ebc3.

* Initial

(cherry picked from commit 646ca52aab)

Co-authored-by: Pablo Garrido <pablogs9@gmail.com>

micro_ros_agent/CMakeLists.txt

@@ -14,6 +14,9 @@
 
 cmake_minimum_required(VERSION 3.5)
 
+option(BUILD_SHARED_LIBS "Control shared/static building." ON)
+option(UBUILD_AGENT_EXECUTABLE "Control shared/static building." ON)
+
 option(UROSAGENT_GENERATE_PROFILE
   "Generates agent.refs according to the .msgs provided in the .repos" OFF
   )
@@ -41,15 +44,26 @@ find_package(ament_cmake_gtest REQUIRED)
 
 find_package(micro_ros_msgs REQUIRED)
 
-add_executable(${PROJECT_NAME}
+include(GNUInstallDirs)
-  src/main.cpp
+set(BIN_INSTALL_DIR     ${CMAKE_INSTALL_BINDIR}     CACHE PATH "Installation directory for binaries")
+set(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR} CACHE PATH "Installation directory for C headers")
+set(LIB_INSTALL_DIR     ${CMAKE_INSTALL_LIBDIR}     CACHE PATH "Installation directory for libraries")
+set(DATA_INSTALL_DIR    ${CMAKE_INSTALL_DATADIR}    CACHE PATH "Installation directory for data")
+
+# Set source files
+set(SRCS
   src/agent/Agent.cpp
   src/agent/graph_manager/graph_manager.cpp
   src/agent/graph_manager/graph_typesupport.cpp
   src/agent/utils/demangle.cpp
   )
 
-target_include_directories(${PROJECT_NAME}
+# Library
+add_library(${PROJECT_NAME} ${SRCS})
+
+target_include_directories(${PROJECT_NAME} BEFORE
+  PUBLIC
+    $<INSTALL_INTERFACE:${INCLUDE_INSTALL_DIR}>
   PRIVATE
     include
   )
@@ -74,27 +88,6 @@ target_link_libraries(${PROJECT_NAME}
   $<$<BOOL:$<PLATFORM_ID:Linux>>:dl>
   )
 
-target_compile_options(${PROJECT_NAME}
-  PRIVATE
-    $<$<C_COMPILER_ID:GNU>:-Wall>
-    $<$<C_COMPILER_ID:GNU>:-Wextra>
-    $<$<C_COMPILER_ID:GNU>:-pedantic>
-  )
-
-set_target_properties(${PROJECT_NAME} PROPERTIES
-  CXX_STANDARD
-    14
-  CXX_STANDARD_REQUIRED
-    YES
-  )
-
-set_target_properties(${PROJECT_NAME} PROPERTIES
-  CXX_STANDARD
-    14
-  CXX_STANDARD_REQUIRED
-    YES
-  )
-
 target_compile_options(${PROJECT_NAME}
   PRIVATE
     $<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>>:-Wall>
@@ -102,23 +95,104 @@ target_compile_options(${PROJECT_NAME}
     $<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>>:-Wpedantic>
   )
 
-ament_export_dependencies(microxrcedds_agent)
+set_target_properties(${PROJECT_NAME} PROPERTIES
-
+  CXX_STANDARD
-ament_package()
+    14
+  CXX_STANDARD_REQUIRED
+    YES
+  )
 
+# Install agent lib
 install(
     TARGETS
         ${PROJECT_NAME}
+    EXPORT
+        ${PROJECT_NAME}Targets
+    RUNTIME DESTINATION
+        ${BIN_INSTALL_DIR}
+    LIBRARY DESTINATION
+        ${LIB_INSTALL_DIR}
+    ARCHIVE DESTINATION
+        ${LIB_INSTALL_DIR}
+    COMPONENT
+        libraries
+    )
+
+# Install includes
+install(
+    DIRECTORY
+        ${PROJECT_SOURCE_DIR}/include/agent
+    DESTINATION
+        ${INCLUDE_INSTALL_DIR}
+    FILES_MATCHING
+        PATTERN "*.hpp"
+        PATTERN "*.h"
+    )
+
+# Export library
+install(
+  EXPORT
+      ${PROJECT_NAME}Targets
+  DESTINATION
+      ${DATA_INSTALL_DIR}/${PROJECT_NAME}/cmake
+  )
+
+# Package configuration
+include(CMakePackageConfigHelpers)
+
+configure_package_config_file(
+      ${PROJECT_SOURCE_DIR}/cmake/Config.cmake.in
+        ${PROJECT_BINARY_DIR}/cmake/config/${PROJECT_NAME}Config.cmake
+    INSTALL_DESTINATION
+        ${DATA_INSTALL_DIR}/${PROJECT_NAME}/cmake
+    PATH_VARS
+        BIN_INSTALL_DIR
+        INCLUDE_INSTALL_DIR
+        LIB_INSTALL_DIR
+        DATA_INSTALL_DIR
+    )
+
+install(
+  FILES
+      ${PROJECT_BINARY_DIR}/cmake/config/${PROJECT_NAME}Config.cmake
+  DESTINATION
+      ${DATA_INSTALL_DIR}/${PROJECT_NAME}/cmake
+  )
+
+if(UBUILD_AGENT_EXECUTABLE)
+  add_executable(micro_ros_agent_bin
+    ${SRCS}
+    src/main.cpp
+    )
+
+  target_include_directories(micro_ros_agent_bin
+    PRIVATE
+      $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+    )
+
+  target_link_libraries(micro_ros_agent_bin ${PROJECT_NAME})
+
+  set_target_properties(micro_ros_agent_bin
+      PROPERTIES OUTPUT_NAME ${PROJECT_NAME})
+
+  install(
+    TARGETS
+      micro_ros_agent_bin
     DESTINATION
       lib/${PROJECT_NAME}
     )
 
-install(
+  install(
     DIRECTORY
       launch
     DESTINATION
       share/${PROJECT_NAME}
     )
+endif()
+
+ament_export_dependencies(microxrcedds_agent)
+
+ament_package()
 
 if(UROSAGENT_GENERATE_PROFILE)
   set(_OUTPUT_PATH "${CMAKE_CURRENT_BINARY_DIR}/python")

micro_ros_agent/cmake/Config.cmake.in

@@ -0,0 +1,32 @@
+# Copyright 2016 Proyectos y Sistemas de Mantenimiento SL (eProsima).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set(@PROJECT_NAME@_VERSION @PROJECT_VERSION@)
+
+@PACKAGE_INIT@
+
+if(MSVC OR MSVC_IDE)
+    set_and_check(@PROJECT_NAME@_BIN_DIR "@PACKAGE_BIN_INSTALL_DIR@")
+endif()
+set_and_check(@PROJECT_NAME@_INCLUDE_DIR "@PACKAGE_INCLUDE_INSTALL_DIR@")
+set_and_check(@PROJECT_NAME@_LIB_DIR "@PACKAGE_LIB_INSTALL_DIR@")
+set_and_check(@PROJECT_NAME@_DATA_DIR "@PACKAGE_DATA_INSTALL_DIR@")
+
+foreach(d @_deps@)
+    list(GET d 0 _name)
+    list(GET d 1 _version)
+    find_package(${_name} ${_version} REQUIRED)
+endforeach()
+
+include(${@PROJECT_NAME@_DATA_DIR}/@PROJECT_NAME@/cmake/@PROJECT_NAME@Targets.cmake)

micro_ros_agent/include/agent/Agent.hpp

@@ -26,11 +26,26 @@ namespace agent {
 
 class Agent
 {
-public:
+private:
-
     Agent();
 
-    ~Agent() = default;
+    ~Agent()
+    {
+        stop();
+    }
+    
+    Agent(const Agent &) = delete;
+
+    Agent(Agent &&) = delete;
+
+    Agent& operator =(
+            const Agent &) = delete;
+
+    Agent& operator =(
+            Agent &&) = delete;
+
+public:
+    static Agent& getInstance();
 
     bool create(
             int argc,
@@ -38,12 +53,14 @@ public:
 
     void run();
 
+    void stop();
+
 private:
-
+    bool initialized = false;
     eprosima::uxr::AgentInstance& xrce_dds_agent_instance_;
-    std::map<eprosima::fastdds::dds::DomainId_t, std::shared_ptr<graph_manager::GraphManager>> graph_manager_map_;
+    std::map<eprosima::fastdds::dds::DomainId_t, graph_manager::GraphManager> graph_manager_map_;
 
-    std::shared_ptr<graph_manager::GraphManager> find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t domain_id);
+    graph_manager::GraphManager* find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t domain_id);
 };
 
 }  // namespace agent

micro_ros_agent/include/agent/graph_manager/graph_manager.hpp

@@ -82,6 +82,28 @@ public:
      */
     ~GraphManager() = default;
 
+	void stop()
+	{
+		if (microros_graph_publisher_.joinable())
+		{
+			exit = true;
+			cv_.notify_one();
+			microros_graph_publisher_.join();
+		}
+
+		subscriber_->delete_datareader(ros_discovery_datareader_);
+		publisher_->delete_datawriter(ros_to_microros_graph_datawriter_);
+
+		participant_->delete_subscriber(subscriber_);
+		participant_->delete_publisher(publisher_);
+
+		// Delete topics
+		participant_->delete_topic(ros_discovery_topic_);
+		participant_->delete_topic(ros_to_microros_graph_topic_);
+
+		eprosima::fastdds::dds::DomainParticipantFactory::get_instance()->delete_participant(participant_);
+	}
+
     /**
      * @brief   Implementation of the notification logic that updates the micro-ROS graph.
      */
@@ -89,28 +111,22 @@ public:
 
     /**
      * @brief   Adds a DDS participant to the graph tree.
-     * @param   participant Pointer to the participant to be added to the graph.
+     * @param   participant eprosima::fastdds::dds::DomainParticipant to be added.
-     */
+     * @param   from_microros if this participant has been added from micro-ROS.
-    void add_participant(
-            const eprosima::fastdds::dds::DomainParticipant* participant);
-
-    /**
-     * @brief   Adds a DDS participant to the graph tree.
-     * @param   guid rtps::GUID_t of the participant to be added.
-     * @param   node_name Name of the ROS 2 node associated to the given participant.
      * @param   enclave ROS 2 enclave.
      */
     void add_participant(
-            const eprosima::fastrtps::rtps::GUID_t& guid,
+            const eprosima::fastdds::dds::DomainParticipant* participant,
-            const std::string& node_name,
+            bool from_microros = true,
-            const std::string& enclave);
+            const std::string& enclave = "/");
 
     /**
      * @brief   Removes a DDS participant from the graph tree.
-     * @param   guid rtps::GUID_t of the participant to be removed.
+     * @param   participant eprosima::fastdds::dds::DomainParticipant to be removed.
      */
     void remove_participant(
-            const eprosima::fastrtps::rtps::GUID_t& guid);
+        const eprosima::fastdds::dds::DomainParticipant* participant,
+        bool from_microros = true);
 
     /**
      * @brief   Adds a DDS datawriter to the graph tree.
@@ -292,28 +308,46 @@ private:
      */
     void update_node_entities_info();
 
+    /**
+     * @brief   Retrieves node name and namespace from
+     *          participant.
+     * @param   participant_name DDS participant name.
+     * @param   node_name ROS2 Node name.
+     * @param   namespace ROS2 Node namespace.
+     */
+    void get_name_and_namespace(
+            std::string participant_name,
+            std::string& node_name,
+            std::string& node_namespace);
+
     eprosima::fastdds::dds::DomainId_t domain_id_;
     bool graph_changed_;
     bool display_on_change_;
-    const char * enclave_;
     std::thread microros_graph_publisher_;
     std::mutex mtx_;
     std::condition_variable cv_;
+    volatile bool exit = false;
+
+    eprosima::fastdds::dds::DataWriterQos datawriter_qos_;
 
     rmw_dds_common::GraphCache graphCache_;
-    std::unique_ptr<ParticipantListener> participant_listener_;
+    ParticipantListener participant_listener_;
-    std::unique_ptr<DatareaderListener> datareader_listener_;
+    DatareaderListener datareader_listener_;
 
-    std::unique_ptr<eprosima::fastdds::dds::TypeSupport> participant_info_typesupport_;
+    eprosima::fastdds::dds::TypeSupport participant_info_typesupport_;
-    std::unique_ptr<eprosima::fastdds::dds::TypeSupport> microros_graph_info_typesupport_;
+    eprosima::fastdds::dds::TypeSupport microros_graph_info_typesupport_;
-    std::unique_ptr<eprosima::fastdds::dds::DomainParticipant> participant_;
+    eprosima::fastdds::dds::DomainParticipant* participant_;
-    std::unique_ptr<eprosima::fastdds::dds::Publisher> publisher_;
+    eprosima::fastdds::dds::Publisher* publisher_;
-    std::unique_ptr<eprosima::fastdds::dds::Subscriber> subscriber_;
+    eprosima::fastdds::dds::Subscriber* subscriber_;
-    std::unique_ptr<eprosima::fastdds::dds::Topic> ros_discovery_topic_;
+    eprosima::fastdds::dds::Topic* ros_discovery_topic_;
-    std::unique_ptr<eprosima::fastdds::dds::Topic> ros_to_microros_graph_topic_;
+    eprosima::fastdds::dds::Topic* ros_to_microros_graph_topic_;
-    std::unique_ptr<eprosima::fastdds::dds::DataWriter> ros_discovery_datawriter_;
+    eprosima::fastdds::dds::DataWriter* ros_to_microros_graph_datawriter_;
-    std::unique_ptr<eprosima::fastdds::dds::DataWriter> ros_to_microros_graph_datawriter_;
+    eprosima::fastdds::dds::DataReader* ros_discovery_datareader_;
-    std::unique_ptr<eprosima::fastdds::dds::DataReader> ros_discovery_datareader_;
+    // Store a auxiliary publishers and datawriter for each participant created in micro-ROS
+    std::map<
+        const eprosima::fastdds::dds::DomainParticipant*,
+        eprosima::fastdds::dds::DataWriter*
+    > micro_ros_graph_datawriters_;
 };
 
 }  // namespace graph_manager

micro_ros_agent/launch/micro_ros_agent_launch.py

@@ -7,6 +7,6 @@ def generate_launch_description():
             package='micro_ros_agent',
             executable='micro_ros_agent',
             name='micro_ros_agent',
-            arguments={'udp4 --port 8888 -v6'}
+            arguments={"udp4", "-p", "8888", "-v6"}
         )
     ])

micro_ros_agent/src/agent/Agent.cpp

@@ -25,13 +25,22 @@ Agent::Agent()
 {
 }
 
+Agent& Agent::getInstance()
+{
+    static Agent instance;
+    return instance;
+}
+
 bool Agent::create(
         int argc,
         char** argv)
 {
     bool result = xrce_dds_agent_instance_.create(argc, argv);
-    if (result)
+
+    if (result && !initialized)
     {
+        initialized = true;
+
         /**
          * Add CREATE_PARTICIPANT callback.
          */
@@ -40,12 +49,7 @@ bool Agent::create(
             ([&](
                 const eprosima::fastdds::dds::DomainParticipant* participant) -> void
             {
-                auto graph_manager_ =
+                auto graph_manager_ = find_or_create_graph_manager(participant->get_domain_id());
-                    find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t(
-                        participant->get_domain_id()
-                    )
-                );
-
                 graph_manager_->add_participant(participant);
             });
         xrce_dds_agent_instance_.add_middleware_callback(
@@ -61,13 +65,8 @@ bool Agent::create(
             ([&](
                 const eprosima::fastdds::dds::DomainParticipant* participant) -> void
             {
-                auto graph_manager_ =
+                auto graph_manager_ = find_or_create_graph_manager(participant->get_domain_id());
-                    find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t(
+                graph_manager_->remove_participant(participant);
-                        participant->get_domain_id()
-                    )
-                );
-
-                graph_manager_->remove_participant(participant->guid());
             });
         xrce_dds_agent_instance_.add_middleware_callback(
             eprosima::uxr::Middleware::Kind::FASTDDS,
@@ -84,11 +83,7 @@ bool Agent::create(
                 const eprosima::fastdds::dds::DomainParticipant* participant,
                 const eprosima::fastdds::dds::DataWriter* datawriter) -> void
             {
-                auto graph_manager_ =
+                auto graph_manager_ = find_or_create_graph_manager(participant->get_domain_id());
-                    find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t(
-                        participant->get_domain_id()
-                    )
-                );
 
                 // TODO(jamoralp): Workaround for Fast-DDS bug #9977. Remove when fixed
                 const eprosima::fastrtps::rtps::InstanceHandle_t instance_handle =
@@ -115,11 +110,7 @@ bool Agent::create(
                 const eprosima::fastdds::dds::DataWriter* datawriter) -> void
             {
 
-                auto graph_manager_ =
+                auto graph_manager_ = find_or_create_graph_manager(participant->get_domain_id());
-                    find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t(
-                        participant->get_domain_id()
-                    )
-                );
 
                 // TODO(jamoralp): Workaround for Fast-DDS bug #9977. Remove when fixed
                 const eprosima::fastrtps::rtps::InstanceHandle_t instance_handle =
@@ -144,11 +135,7 @@ bool Agent::create(
                 const eprosima::fastdds::dds::DomainParticipant* participant,
                 const eprosima::fastdds::dds::DataReader* datareader) -> void
             {
-                auto graph_manager_ =
+                auto graph_manager_ = find_or_create_graph_manager(participant->get_domain_id());
-                    find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t(
-                        participant->get_domain_id()
-                    )
-                );
 
                 // TODO(jamoralp): Workaround for Fast-DDS bug #9977. Remove when fixed
                 const eprosima::fastrtps::rtps::InstanceHandle_t instance_handle =
@@ -174,11 +161,7 @@ bool Agent::create(
                 const eprosima::fastdds::dds::DomainParticipant* participant,
                 const eprosima::fastdds::dds::DataReader* datareader) -> void
             {
-                auto graph_manager_ =
+                auto graph_manager_ = find_or_create_graph_manager(participant->get_domain_id());
-                    find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t(
-                        participant->get_domain_id()
-                    )
-                );
 
                 // TODO(jamoralp): Workaround for Fast-DDS bug #9977. Remove when fixed
                 const eprosima::fastrtps::rtps::InstanceHandle_t instance_handle =
@@ -199,25 +182,29 @@ bool Agent::create(
 
 void Agent::run()
 {
-    return xrce_dds_agent_instance_.run();
+    xrce_dds_agent_instance_.run();
 }
 
-std::shared_ptr<graph_manager::GraphManager> Agent::find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t domain_id)
+void Agent::stop()
+{
+    xrce_dds_agent_instance_.stop();
+
+    for (auto & element : graph_manager_map_)
+    {
+        element.second.stop();
+    }
+
+    graph_manager_map_.clear();
+}
+
+graph_manager::GraphManager* Agent::find_or_create_graph_manager(eprosima::fastdds::dds::DomainId_t domain_id)
 {
     auto it = graph_manager_map_.find(domain_id);
 
     if (it != graph_manager_map_.end()) {
-        return it->second;
+        return &it->second;
     }else{
-        return graph_manager_map_.insert(
+        return &graph_manager_map_.emplace(domain_id, domain_id).first->second;
-            std::pair<
-                eprosima::fastdds::dds::DomainId_t,
-                std::shared_ptr<graph_manager::GraphManager>
-            >(
-                domain_id,
-                std::make_shared<graph_manager::GraphManager>(domain_id)
-            )
-        ).first->second;
     }
 }
 

micro_ros_agent/src/agent/graph_manager/graph_manager.cpp

@@ -22,83 +22,83 @@ namespace agent {
 namespace graph_manager {
 
 GraphManager::GraphManager(eprosima::fastdds::dds::DomainId_t domain_id)
-    // : eprosima::fastrtps::ParticipantListener()
     : domain_id_(domain_id)
     , graph_changed_(false)
     , display_on_change_(false)
-    , enclave_("/")
     , mtx_()
     , cv_()
     , graphCache_()
-    , participant_listener_(std::make_unique<ParticipantListener>(this))
+    , participant_listener_(this)
-    , datareader_listener_(std::make_unique<DatareaderListener>(this))
+    , datareader_listener_(this)
-    , participant_info_typesupport_(std::make_unique<
+    , participant_info_typesupport_()
-        eprosima::fastdds::dds::TypeSupport>(new graph_manager::ParticipantEntitiesInfoTypeSupport()))
+    , microros_graph_info_typesupport_()
-    , microros_graph_info_typesupport_(std::make_unique<
-        eprosima::fastdds::dds::TypeSupport>(new graph_manager::MicrorosGraphInfoTypeSupport()))
 {
+    eprosima::fastdds::dds::DomainParticipantFactory::get_instance()->load_profiles();
+    participant_info_typesupport_ = (eprosima::fastdds::dds::TypeSupport) new graph_manager::ParticipantEntitiesInfoTypeSupport();
+    microros_graph_info_typesupport_ = (eprosima::fastdds::dds::TypeSupport) new graph_manager::MicrorosGraphInfoTypeSupport();
+
     // Create DomainParticipant
     eprosima::fastdds::dds::DomainParticipantQos participant_qos =
         eprosima::fastdds::dds::DomainParticipantFactory::get_instance()->get_default_participant_qos();
 
-    size_t length = snprintf(nullptr, 0, "enclave=%s;", enclave_) + 1;
+    const char * enclave = "/";
+    size_t length = snprintf(nullptr, 0, "enclave=%s;", enclave) + 1;
     participant_qos.user_data().resize(length);
     snprintf(reinterpret_cast<char *>(participant_qos.user_data().data_vec().data()),
-        length, "enclave=%s;", enclave_);
+        length, "enclave=%s;", enclave);
 
-    participant_qos.name(enclave_);
+    participant_qos.name(enclave);
     participant_qos.wire_protocol().builtin.readerHistoryMemoryPolicy =
         eprosima::fastrtps::rtps::PREALLOCATED_WITH_REALLOC_MEMORY_MODE;
     participant_qos.wire_protocol().builtin.writerHistoryMemoryPolicy =
         eprosima::fastrtps::rtps::PREALLOCATED_WITH_REALLOC_MEMORY_MODE;
 
-    participant_.reset(eprosima::fastdds::dds::DomainParticipantFactory::get_instance()->
+    eprosima::fastdds::dds::StatusMask par_mask = eprosima::fastdds::dds::StatusMask::none();
-        create_participant(domain_id_, participant_qos, participant_listener_.get()));
+    participant_ = eprosima::fastdds::dds::DomainParticipantFactory::get_instance()->
+        create_participant(domain_id_, participant_qos, &participant_listener_, par_mask);
 
     // Register participant within typesupport
-    participant_->register_type(*participant_info_typesupport_);
+    participant_->register_type(participant_info_typesupport_);
-    participant_->register_type(*microros_graph_info_typesupport_);
+    participant_->register_type(microros_graph_info_typesupport_);
 
     // Create publisher
-    publisher_.reset(participant_->create_publisher(
+    publisher_ = participant_->create_publisher(
-        eprosima::fastdds::dds::PUBLISHER_QOS_DEFAULT));
+        eprosima::fastdds::dds::PUBLISHER_QOS_DEFAULT);
 
     // Create subscriber
-    subscriber_.reset(participant_->create_subscriber(
+    subscriber_ = participant_->create_subscriber(
-        eprosima::fastdds::dds::SUBSCRIBER_QOS_DEFAULT));
+        eprosima::fastdds::dds::SUBSCRIBER_QOS_DEFAULT);
 
     // Create topics
-    ros_discovery_topic_.reset(participant_->create_topic("ros_discovery_info",
+    ros_discovery_topic_ = participant_->create_topic("ros_discovery_info",
-        participant_info_typesupport_->get_type_name(),
+        participant_info_typesupport_.get_type_name(),
-        eprosima::fastdds::dds::TOPIC_QOS_DEFAULT));
+        eprosima::fastdds::dds::TOPIC_QOS_DEFAULT);
 
-    ros_to_microros_graph_topic_.reset(participant_->create_topic("ros_to_microros_graph",
+    ros_to_microros_graph_topic_ = participant_->create_topic("ros_to_microros_graph",
-        microros_graph_info_typesupport_->get_type_name(),
+        microros_graph_info_typesupport_.get_type_name(),
-        eprosima::fastdds::dds::TOPIC_QOS_DEFAULT));
+        eprosima::fastdds::dds::TOPIC_QOS_DEFAULT);
 
     // Create datawriters
-    eprosima::fastdds::dds::DataWriterQos datawriter_qos =
+    datawriter_qos_ =
         eprosima::fastdds::dds::DATAWRITER_QOS_DEFAULT;
 
-    datawriter_qos.history().kind =
+    datawriter_qos_.history().kind =
         eprosima::fastdds::dds::HistoryQosPolicyKind::KEEP_LAST_HISTORY_QOS;
-    datawriter_qos.history().depth = 1;
+    datawriter_qos_.history().depth = 1;
-    datawriter_qos.endpoint().history_memory_policy =
+    datawriter_qos_.endpoint().history_memory_policy =
         eprosima::fastrtps::rtps::MemoryManagementPolicy::PREALLOCATED_WITH_REALLOC_MEMORY_MODE;
-    datawriter_qos.publish_mode().kind =
+    datawriter_qos_.publish_mode().kind =
         eprosima::fastdds::dds::PublishModeQosPolicyKind::ASYNCHRONOUS_PUBLISH_MODE;
-    datawriter_qos.reliability().kind =
+    datawriter_qos_.reliability().kind =
         eprosima::fastdds::dds::ReliabilityQosPolicyKind::RELIABLE_RELIABILITY_QOS;
-    datawriter_qos.durability().kind =
+    datawriter_qos_.durability().kind =
         eprosima::fastdds::dds::DurabilityQosPolicyKind::TRANSIENT_LOCAL_DURABILITY_QOS;
 
-    ros_discovery_datawriter_.reset(
+    eprosima::fastdds::dds::DataWriterQos ros_to_microros_datawriter_qos_ = datawriter_qos_;
-        publisher_->create_datawriter(ros_discovery_topic_.get(), datawriter_qos));
+    ros_to_microros_datawriter_qos_.history().kind =
-
-    datawriter_qos.history().kind =
         eprosima::fastdds::dds::HistoryQosPolicyKind::KEEP_ALL_HISTORY_QOS;
-    ros_to_microros_graph_datawriter_.reset(
+    ros_to_microros_graph_datawriter_ = 
-        publisher_->create_datawriter(ros_to_microros_graph_topic_.get(), datawriter_qos));
+        publisher_->create_datawriter(ros_to_microros_graph_topic_, ros_to_microros_datawriter_qos_);
 
     // Create datareaders
 
@@ -114,9 +114,9 @@ GraphManager::GraphManager(eprosima::fastdds::dds::DomainId_t domain_id)
     datareader_qos.durability().kind =
         eprosima::fastdds::dds::DurabilityQosPolicyKind::TRANSIENT_LOCAL_DURABILITY_QOS;
 
-    ros_discovery_datareader_.reset(
+    ros_discovery_datareader_ = 
-        subscriber_->create_datareader(ros_discovery_topic_.get(),
+        subscriber_->create_datareader(ros_discovery_topic_,
-            datareader_qos, datareader_listener_.get()));
+            datareader_qos, &datareader_listener_);
 
     // Set graph cache on change callback function
     graphCache_.set_on_change_callback([this]()
@@ -137,10 +137,15 @@ inline void GraphManager::publish_microros_graph()
             std::unique_lock<std::mutex> lock(mtx_);
             cv_.wait(lock, [this]()
             {
-                return this->graph_changed_;
+                return this->graph_changed_ || exit;
             });
         }
 
+        if (exit)
+        {
+            break;
+        }
+
         if (display_on_change_)
         {
             std::cout << "Updated uros Graph: graph changed" << std::endl;
@@ -292,34 +297,57 @@ inline void GraphManager::publish_microros_graph()
 }
 
 void GraphManager::add_participant(
-        const eprosima::fastdds::dds::DomainParticipant* participant)
+        const eprosima::fastdds::dds::DomainParticipant* participant,
-{
+        bool from_microros,
-    const eprosima::fastdds::dds::DomainParticipantQos qos = participant->get_qos();
-    this->add_participant(participant->guid(), qos.name().to_string(), enclave_);
-}
-
-void GraphManager::add_participant(
-        const eprosima::fastrtps::rtps::GUID_t& guid,
-        const std::string& node_name,
         const std::string& enclave)
 {
-    const rmw_gid_t gid = rmw_fastrtps_shared_cpp::create_rmw_gid("rmw_fastrtps_cpp", guid);
+    const eprosima::fastdds::dds::DomainParticipantQos qos = participant->get_qos();
+    const rmw_gid_t gid = rmw_fastrtps_shared_cpp::create_rmw_gid("rmw_fastrtps_cpp", participant->guid());
 
     graphCache_.add_participant(gid, enclave);
 
-    if (node_name != enclave) // Do not add root node
+    // Do not add root node and
+    // do not announce non-micro-ROS participants
+    if (qos.name().to_string() != "/" && from_microros)
     {
+        std::string isolated_node_name, isolated_namespace;
+        get_name_and_namespace(qos.name().to_string(), isolated_node_name, isolated_namespace);
+
         rmw_dds_common::msg::ParticipantEntitiesInfo info =
-            graphCache_.add_node(gid, node_name, enclave_);
+            graphCache_.add_node(gid, isolated_node_name, isolated_namespace);
-        ros_discovery_datawriter_->write(static_cast<void *>(&info));
+
+        auto it = micro_ros_graph_datawriters_.find(participant);
+        if (it == micro_ros_graph_datawriters_.end())
+        {
+            // Create datawriter
+            eprosima::fastdds::dds::DataWriter* datawriter;
+            datawriter = publisher_->create_datawriter(ros_discovery_topic_, datawriter_qos_);
+
+            it = micro_ros_graph_datawriters_.insert(
+                std::make_pair(participant, std::move(datawriter))).first;
+        }
+
+        it->second->write(static_cast<void *>(&info));
     }
 }
 
 void GraphManager::remove_participant(
-        const eprosima::fastrtps::rtps::GUID_t& guid)
+        const eprosima::fastdds::dds::DomainParticipant* participant,
+        bool from_microros)
 {
-    const rmw_gid_t gid = rmw_fastrtps_shared_cpp::create_rmw_gid("rmw_fastrtps_cpp", guid);
+    const rmw_gid_t gid = rmw_fastrtps_shared_cpp::create_rmw_gid("rmw_fastrtps_cpp", participant->guid());
     graphCache_.remove_participant(gid);
+
+    if (from_microros)
+    {
+        rmw_dds_common::msg::ParticipantEntitiesInfo info;
+        rmw_dds_common::convert_gid_to_msg(&gid, &info.gid);
+        auto it = micro_ros_graph_datawriters_.find(participant);
+        it->second->write(static_cast<void *>(&info));
+
+        publisher_->delete_datawriter(it->second);
+        micro_ros_graph_datawriters_.erase(participant);
+    }
 }
 
 void GraphManager::add_datawriter(
@@ -449,14 +477,18 @@ void GraphManager::associate_entity(
     {
         case dds::xrce::OBJK_DATAWRITER:
         {
+            std::string isolated_node_name, isolated_namespace;
+            get_name_and_namespace(qos.name().c_str(), isolated_node_name, isolated_namespace);
             info = graphCache_.associate_writer(
-                entity_gid, participant_gid, qos.name().c_str(), enclave_);
+                entity_gid, participant_gid, isolated_node_name, isolated_namespace);
             break;
         }
         case dds::xrce::OBJK_DATAREADER:
         {
+            std::string isolated_node_name, isolated_namespace;
+            get_name_and_namespace(qos.name().c_str(), isolated_node_name, isolated_namespace);
             info = graphCache_.associate_reader(
-                entity_gid, participant_gid, qos.name().c_str(), enclave_);
+                entity_gid, participant_gid, isolated_node_name, isolated_namespace);
             break;
         }
         default:
@@ -464,7 +496,9 @@ void GraphManager::associate_entity(
             break;
         }
     }
-    ros_discovery_datawriter_->write(static_cast<void *>(&info));
+
+    auto it = micro_ros_graph_datawriters_.find(participant);
+    it->second->write(static_cast<void *>(&info));
 }
 
 
@@ -556,6 +590,43 @@ void GraphManager::update_node_entities_info()
     }
 }
 
+void GraphManager::get_name_and_namespace(
+    std::string participant_name,
+    std::string& node_name,
+    std::string& node_namespace)
+{
+    // Remove first / if exists
+    if (participant_name.rfind("/", 0) == 0)
+    {
+        participant_name.erase(participant_name.begin());
+    }
+
+    // Split node name in domain and node name
+    std::istringstream iss(participant_name);
+    std::vector<std::string> result;
+    std::string token;
+
+    while(std::getline(iss, token, '/'))
+    {
+        result.push_back(token);
+    }
+
+    if (result.size() > 1)
+    {
+        node_namespace = "/" + result[0];
+        for (size_t i = 1; i < result.size(); i++)
+        {
+            node_name.append(result[i] + "/");
+        }
+        node_name.pop_back();
+    }
+    else
+    {
+        node_name = participant_name;
+        node_namespace = "/";
+    }
+}
+
 GraphManager::ParticipantListener::ParticipantListener(
         GraphManager* graph_manager)
     : eprosima::fastdds::dds::DomainParticipantListener()
@@ -581,13 +652,13 @@ void GraphManager::ParticipantListener::on_participant_discovery(
             const std::string enclave =
                 std::string(name_found->second.begin(), name_found->second.end());
 
-            graphManager_from_->add_participant(participant->guid(), info.info.m_participantName.to_string(), enclave);
+            graphManager_from_->add_participant(participant, false, enclave);
             break;
         }
         case eprosima::fastrtps::rtps::ParticipantDiscoveryInfo::REMOVED_PARTICIPANT:
         case eprosima::fastrtps::rtps::ParticipantDiscoveryInfo::DROPPED_PARTICIPANT:
         {
-            graphManager_from_->remove_participant(info.info.m_guid);
+            graphManager_from_->remove_participant(participant, false);
             break;
         }
         default:
@@ -656,7 +727,6 @@ void GraphManager::ParticipantListener::on_subscriber_discovery(
         eprosima::fastrtps::rtps::ReaderDiscoveryInfo&& info)
 {
     process_discovery_info<eprosima::fastrtps::rtps::ReaderDiscoveryInfo>(info);
-    // graphManager_from_->associate_entity(info.info.guid(), participant, dds::xrce::OBJK_DATAREADER);
 }
 
 void GraphManager::ParticipantListener::on_publisher_discovery(
@@ -664,7 +734,6 @@ void GraphManager::ParticipantListener::on_publisher_discovery(
         eprosima::fastrtps::rtps::WriterDiscoveryInfo&& info)
 {
     process_discovery_info<eprosima::fastrtps::rtps::WriterDiscoveryInfo>(info);
-    // graphManager_from_->associate_entity(info.info.guid(), participant, dds::xrce::OBJK_DATAWRITER);
 }
 
 GraphManager::DatareaderListener::DatareaderListener(

micro_ros_agent/src/main.cpp

@@ -16,7 +16,7 @@
 
 int main(int argc, char** argv)
 {
-    uros::agent::Agent micro_ros_agent;
+    uros::agent::Agent& micro_ros_agent = micro_ros_agent.getInstance();
 
     /** Bypass '--ros-args' flag, as we use our own CLI parser.
       * As a workaround for launch files, arguments will be passed from
@@ -27,6 +27,11 @@ int main(int argc, char** argv)
     std::vector<std::string> params;
     for (int i = 0; i < argc; ++i)
     {
+        if(strcmp("--ros-args", argv[i]) == 0)
+        {
+            argc = i;
+            break;
+        }
         params.emplace_back(std::string(argv[i]));
     }