https://spring.io/serverless/

Serverless workloads are “event-driven workloads that aren’t concerned with aspects normally handled by server infrastructure.” Concerns like “how many instances to run” and “what operating system to use” are all managed by a Function as a Service platform (or FaaS), leaving developers free to focus on business logic.
Serverless applications have a number of specific characteristics, including:
The Spring portfolio provides a robust collection of functionality for use within serverless applications. Whether accessing data with Spring Data, using the enterprise integration patterns with Spring Integration, or using the latest in reactive programming with Spring Framework and Project Reactor, Spring lets developers be productive in a serverless environment from day one.
Spring also helps your functions avoid vendor lock-in. The adapters provided by Spring Cloud Function let you decouple from vendor-specific APIs when running your code on their platform.
Spring Cloud Function provides capabilities that lets Spring developers take advantage of serverless or FaaS platforms.
The java.util.function package from core Java serves as the foundation of the programming model used by Spring Cloud Function. In a nutshell, Spring Cloud Function provides:
Spring Cloud Function provides adaptors so that you can run your functions on the most common FaaS services including Amazon Lambda, Apache OpenWhisk, Microsoft Azure, and Project Riff.
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