Ticket System

A ticket system allows us to signal triggers inside a single class/object to notify certain operations that change has happened. For example you tell some operation to recalculate something when that ticket has been changed.

We create a primitive value like Integer as a property. Every operation that should result a downstream draw call or other changes increments the value of the ticket.

Downstream we detect if the ticket integer has changed.

We also then can use different tickets to track different changes.