TODO

• Replace gear with program in kafka introduction

Practical examples

Web app: Login

This could be the insurance form.

Events:

• User clicks "login"
• Request is made
• Request failed
• Login approved
• Login rejected

States:

• Requesting
• Retry (number)
• Disconnected
• Logged in
• Invalid credentials

Effects:

• Render
  • Invalid credentials
  • Logged in
  • Retrying
  • Disconnected
• HTTP Request (fetch)
  • POST /login

Server side: shipping information for shopping cart

This is refurnishing the house.

Events:

• Add Item
• Remove Item

States:

• Order Id
• Items

Effects:

• Kafka push:
  • Shipping not available
  • Shipping available
  • Shipping free
  • Shipping price is standard rate

Last slide

• Redux Heat

• Event Sourcing

• Martin Fowler’s Memory Image