Concepts

• Workflow - manages all orchestration activities
• Activity - single well defined action, should be retryable
• Idempotency Keys
• Deterministic constraints
  • Replayability
  • Event sourcing
• Workers

Worker

A Worker

• can execute only code that has been registered to it.
• knows which piece of code to execute from Tasks that it gets from the Task Queue.
• listens only to the Task Queue that it is registered to.

Sample

• Workflow: Transfer Money
  • Activity: Withdraw Money
  • Activity: Deposit Money
    • if fail refund