Summary:
Changelog: [internal]
# What is Teller?
Teller is a bank's employee who deals with the customer on behalf of the bank. In Fabric's scenario it is a class that on behalf of the view deals with State.
# Why do we need it?
Dealing with `ConcreteState` can be complicated and patterns are often repeated among different component views. `ConcreteStateTeller` aims to resolve these issues. Examples:
- You can call teller's methods without checking for nullptr (we have had crashes because of this before).
- Methods are save to be called on any thread.
- Mechanism to retry state update if it fails is built in.
It is designed to be used from ComponentView so views don't have to talk directly to `ConcreteState`.
Reviewed By: JoshuaGross, shergin
Differential Revision: D23216865
fbshipit-source-id: 90a50702e036eac084f89743ebab687a67182dc0
Samuel SuslaandFacebook GitHub Bot
2bc8ce1549