FairMQ: Rewrite event manager to support multiple subscribers

fairmq/test/event_manager/_event_manager.cxx

@@ -0,0 +1,64 @@
+/********************************************************************************
+ *    Copyright (C) 2017 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include <gtest/gtest.h>
+#include <fairmq/EventManager.h>
+#include <string>
+
+namespace
+{
+
+using namespace std;
+using namespace fair::mq;
+
+struct TestEvent : fair::mq::Event<std::string> {};
+
+TEST(EventManager, Basics)
+{
+    EventManager mgr{};
+    int call_counter = 0;
+    int call_counter2 = 0;
+    int value = 0;
+    string value2;
+
+    EventManager::Callback<TestEvent, int> callback{
+        [&](TestEvent::KeyType& key, int newValue){
+            ++call_counter;
+            if (key == "test") value = newValue;
+        }
+    };
+    EventManager::Callback<TestEvent, string> callback2{
+        [&](TestEvent::KeyType& key, string newValue){
+            ++call_counter2;
+            if (key == "test") value2 = newValue;
+        }
+    };
+
+    mgr.Subscribe<TestEvent, int>("foo_subscriber", callback);
+    // double subscription will automatically unsubscribe first
+    mgr.Subscribe<TestEvent, int>("foo_subscriber", callback);
+    mgr.Emit<TestEvent>(TestEvent::KeyType{"test"}, 42);
+    ASSERT_EQ(call_counter, 1);
+    ASSERT_EQ(value, 42);
+
+    mgr.Unsubscribe<TestEvent, int>("foo_subscriber");
+    mgr.Emit<TestEvent>(TestEvent::KeyType{"test"}, 13);
+    ASSERT_EQ(call_counter, 1);
+
+    mgr.Subscribe<TestEvent, int>("foo_subscriber", callback);
+    mgr.Subscribe<TestEvent, string>("foo_subscriber", callback2);
+    // two different callbacks:
+    mgr.Emit<TestEvent>(TestEvent::KeyType{"test"}, 9000);
+    mgr.Emit<TestEvent>(TestEvent::KeyType{"test"}, string{"over 9000"});
+    ASSERT_EQ(call_counter, 2);
+    ASSERT_EQ(value, 9000);
+    ASSERT_EQ(call_counter2, 1);
+    ASSERT_EQ(value2, "over 9000");
+}
+
+} // namespace