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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