Architecture of Computer Games

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 void Object::SendEvent(StringHash eventType, VariantMap& eventData) {
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     SharedPtr<EventReceiverGroup> group(context->GetEventReceivers(this, eventType));
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     if (group) {
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         group->BeginSendEvent();
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         for (unsigned i = 0; i < group->receivers_.Size(); ++i) {
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             Object* receiver = group->receivers_[i];
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             // Holes may exist if receivers removed during send
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             if (!receiver) continue;
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             receiver->OnEvent(this, eventType, eventData);
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             // If self has been destroyed as a result of event handling, exit
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             if (self.Expired()) {
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                 group->EndSendEvent();
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                 context->EndSendEvent();
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                 return;
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             }
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             processed.Insert(receiver);
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         }
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         group->EndSendEvent();
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     }
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 }

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 public interface ICustomMessageTarget : IEventSystemHandler
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 {
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     // functions that can be called via the messaging system
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     void Message1();
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     void Message2();
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 }
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 public class CustomMessageTarget : MonoBehaviour, ICustomMessageTarget
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 {
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     public void Message1()
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     {
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         // handle message
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     }
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     public void Message2()
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     {
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         // handle message
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     }
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 }
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 // sending message 
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 ExecuteEvents.Execute<ICustomMessageTarget>(target, null, (x,y) => x.Message1());

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 // RocketComponent
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 void OnTriggerEnter2D (Collider2D col) {
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     // If it hits an enemy...
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     if(col.tag == "Enemy") {
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         // ... find the Enemy script and call the Hurt function.
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         col.gameObject.GetComponent<Enemy>().Hurt();
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         // Call the explosion instantiation.
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         OnExplode();
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         // Destroy the rocket.
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         Destroy (gameObject);
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     }
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     // Otherwise if it hits a bomb crate...
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     else if(col.tag == "BombPickup") {
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         // ... find the Bomb script and call the Explode function.
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         col.gameObject.GetComponent<Bomb>().Explode();
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         // Destroy the bomb crate.
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         Destroy (col.transform.root.gameObject);
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         // Destroy the rocket.
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         Destroy (gameObject);
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     }
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 }