public void AddSystem(ISystem system)
{
systems.Add(system);
var systemType = system.GetType();
var messageTypes = system.HearsMessages();
messageTypes.ForEach(t => MessageHub.Register(systemType, t));
var requiredTypes = system.RequiredTypes();
FamilyManager.Register(requiredTypes);
var nodeType = system.NodeType();
if (nodeType != null)
{
FamilyManager.RegisterNodeFamily(nodeType);
}
if (system is IKnowsEngine)
{
(system as IKnowsEngine).Engine = this;
}
}