FIX: fixed empty bug

One feature added to EventManager has been disconnecting
a participant at runtime. Unfortunatly, then the
manager of this participant is set to nullptr using
the setManager method. But this method also subscribes to the
shutdown event afterwords. This commit checks if the manager
is nullptr and ignore subscribing in that case.

.drone.yml

@@ -0,0 +1,48 @@
+kind: pipeline
+type: kubernetes
+name: build-amd64
+platform:
+  arch: amd64
+node_selector:
+  kubernetes.io/arch: amd64
+
+steps:
+  - name: submodules
+    image: alpine/git
+    commands:
+      - git submodule update --init --recursive
+
+  - name: build-amd64
+    image: debian:bookworm-slim
+    commands:
+        - apt-get update
+        - apt-get -qy install gcc-12 cmake make build-essential 
+        - mkdir build
+        - cd build; cmake ..
+        - make -j 4 
+        - make test
+
+--- 
+kind: pipeline
+type: kubernetes
+name: build-arm64
+platform:
+  arch: arm64
+node_selector:
+  kubernetes.io/arch: arm64
+
+steps:
+  - name: submodules
+    image: alpine/git
+    commands:
+      - git submodule update --init --recursive
+
+  - name: build-arm64
+    image: debian:bookworm-slim
+    commands:
+        - apt-get update
+        - apt-get -qy install gcc-12 cmake make build-essential
+        - mkdir build
+        - cd build; cmake ..
+        - make -j 4 
+        - make test

include/EventManager/Event.hpp

@@ -42,7 +42,7 @@
       std::uint64_t responseId_;
 
       /// identifies if this event is a response to another event
-      std::atomic<bool> isResponse_;
+      bool isResponse_;
 
       /// emitter of the event
       std::shared_ptr<EventManager::Participant> emitter_;

include/EventManager/Participant.hpp

@@ -181,7 +181,13 @@
        *
        * @param manager - the manager to set
        */
-      void setManager(std::shared_ptr<EventManager::Manager> manager) { manager_=manager;_subscribe(EVENT_TYPE_SHUTDOWN);}
+      void setManager(std::shared_ptr<EventManager::Manager> manager) 
+        {   manager_=manager; 
+            if (manager_!=nullptr)
+            {
+              _subscribe(EVENT_TYPE_SHUTDOWN);
+            }
+        }
 
       /**
        * @brief Method to set the unique id of the participant

src/EventManager/Manager.cpp

@@ -88,7 +88,10 @@
      throw std::runtime_error("can not stop main thread");
    }
 
-   mainThread_->join();
+    if (mainThread_->joinable())
+    {
+      mainThread_->join();
+    }
  }
 
  void EventManager::Manager::stopScheduling_()
@@ -107,8 +110,11 @@
      throw std::runtime_error("can not stop scheduling thread");
    }
 
-   schedulingThread_->join();
+    if (schedulingThread_->joinable())
- }
+    {
+      schedulingThread_->join();
+    }
+}
 
  void EventManager::Manager::start()
  {
@@ -288,6 +294,11 @@
  bool EventManager::Manager::empty() const
  {
    bool isEmpty=true;
+  
+   while(!commandQueue_.empty())
+   {
+     std::this_thread::sleep_for(std::chrono::milliseconds(100));
+   }
 
    for (auto it = eventMap_.begin(); it != eventMap_.end(); ++it)
    {
@@ -383,6 +394,9 @@ void EventManager::Manager::processDisconnect_( std::shared_ptr<EventManager::Pa
   // before the participant gets disconnected it has to be unscheduled
   processDisableScheduling_( participant ); 
 
+  // unsubscribe plugin from all events
+  unsubscribe(participant);
+
   std::lock_guard<std::mutex> guard(mutexParticipants_);
   auto it = std::find( participants_.begin(), participants_.end(), participant );
   if( it != participants_.end() )

tests/test_basic.cpp

@@ -87,6 +87,11 @@ SCENARIO("Basic Usage of EventManager", "[Manager]")
       manager = std::make_shared<EventManager::Manager>();
     }());
 
+    REQUIRE_NOTHROW([&]()
+    {
+      manager->start();
+    }());
+
     REQUIRE(manager->empty() == true);
 
     std::shared_ptr<myParticipant> participant0;
@@ -107,11 +112,6 @@ SCENARIO("Basic Usage of EventManager", "[Manager]")
 
     REQUIRE(manager->empty() == false);
 
-    REQUIRE_NOTHROW([&]()
-    {
-      manager->start();
-    }());
-
     REQUIRE(manager->isRunning() == true);
 
     WHEN("emitting shutdown event")