Lambda Function – Implementing Business Logic
You can create AWS Lambda functions that can be triggered from your Amazon Lex bot. As we discussed in Chapter 2, Analyzing Documents and Text with Natural Language Processing, serverless computing and Lambda functions are a good match for implementing the fulfillment and validation functions in your Lex bot. The Lambda functions integrate better and faster and scale better than returning the intent to a backend application for every step, such as validation. Once the intent has been validated and you are satisfied with the parameters, you can call a backend API to fulfill the request. You can implement simple fulfillment requests as Lambda functions, thereby making your bot responsive and scalable.
In the next exercise, you will learn how to implement the business logic behind the bot as a Lambda function in AWS and call a real-world REST API to get information that you can return to the user from an external service.
