Create a State Machine with a Callback Pattern
Explore how to create a state machine in AWS Step Functions using the callback pattern. Understand how waitForTaskToken enables workflows to pause and resume with external task completions, and practice integrating Lambda functions and asynchronous processes to build efficient workflows.
We'll cover the following...
In this lesson, we will focus on creating a state machine with the callback pattern.
The callback pattern
The callback pattern in AWS Step Functions is like a delivery service that requires signature confirmation. When a delivery arrives, the recipient is notified and must provide their signature to confirm receipt. Similarly, in Step Functions, the callback pattern is a way for a state to wait for an external process to complete and provide a token to confirm that it has finished.
Let's break it down using an analogy and then provide an advanced example.
Analogy: Imagine we are running an art event, and we have several tasks to complete before the event can begin:
Set up the venue.
Arrange catering. ...