void OnEnable()
        {
            // subscription.
            _bus.Subscribe <TestEvent1> (OnEvent11);
            _bus.Subscribe <TestEvent1> (OnEvent12);
            _bus.Subscribe <TestEvent1> (d => {
                // This callback should not be called due OnEvent2 interrupted execution flow.
                Debug.Log("[EVENT1-SUBSCRIBER3] => " + d);
                return(false);
            });

            _bus.Subscribe <TestEvent2> (OnEvent21);

            _bus.Subscribe <TestEvent3> (OnEvent31);

            _bus.Subscribe <float> (OnEventFloat);

            // test data.
            // class 1
            var data1 = new TestEvent1
            {
                IntValue    = 1,
                StringValue = "123"
            };
            // class 2
            var data2 = new TestEvent2
            {
                FloatValue  = 123.456f,
                ObjectValue = "String as object"
            };
            // struct
            var data3 = new TestEvent3()
            {
                StringValue = "String inside struct"
            };

            // publishing.
            _bus.Publish <TestEvent1> (data1);

            _bus.Publish <TestEvent2> (data2);

            _bus.Publish <TestEvent3> (data3);
            // test simple typed value
            _bus.Publish <float> (1f + 0.2345f);
        }
        void OnEnable()
        {
            // subscription.
            _bus.Subscribe <TestEvent1> (OnEvent11);
            _bus.Subscribe <TestEvent1> (OnEvent12);
            _bus.Subscribe <TestEvent1> (d => {
                // As lambda.
                Debug.Log("[EVENT1-SUBSCRIBER3] => " + d);
            });

            _bus.Subscribe <TestEvent2> (OnEvent21);

            _bus.Subscribe <TestEvent3> (OnEvent31);

            _bus.Subscribe <float> (OnEventFloat);

            // test data.
            // class 1
            var data1 = new TestEvent1 {
                IntValue    = 1,
                StringValue = "123"
            };

            // class 2
            var data2 = new TestEvent2 {
                FloatValue  = 123.456f,
                ObjectValue = "String as object"
            };

            // struct
            var data3 = new TestEvent3 {
                StringValue = "String inside struct"
            };

            // publishing.
            _bus.Publish <TestEvent1> (data1);

            _bus.Publish <TestEvent2> (data2);

            _bus.Publish <TestEvent3> (data3);

            // test simple typed value
            _bus.Publish <float> (1f + 0.2345f);
        }
 bool OnEvent31(TestEvent3 msg)
 {
     Debug.Log("[EVENT3-SUBSCRIBER] => " + msg.StringValue);
     return(false);
 }
 void OnEvent31(TestEvent3 msg)
 {
     Debug.Log("[EVENT3-SUBSCRIBER] => " + msg.StringValue);
 }