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Spring Cloud Function is a project with the following high-level goals:

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    Promote the implementation of business logic via functions.

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    Decouple the development lifecycle of business logic from any specific runtime target so that the same code can run as a web endpoint, a stream processor, or a task.

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    Support a uniform programming model across serverless providers, as well as the ability to run standalone (locally or in a PaaS).

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    Enable Spring Boot features (auto-configuration, dependency injection, metrics) on serverless providers.

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It abstracts away all of the transport details and infrastructure, allowing the developer to keep all the familiar tools and processes, and focus firmly on business logic.

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Features

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Spring Cloud Function features:

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    Wrappers for @Beans of type Function, Consumer and +Supplier, exposing them to the outside world as either HTTP +endpoints and/or message stream listeners/publishers with RabbitMQ, Kafka etc.

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    Compiling strings which are Java function bodies into bytecode, and +then turning them into @Beans that can be wrapped as above.

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    Deploying a JAR file containing such an application context with an +isolated classloader, so that you can pack them together in a single +JVM.

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    Adapters for AWS Lambda, Microsoft Azure, Apache OpenWhisk and possibly other "serverless" service providers.

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Here’s a complete, executable, testable Spring Boot application (implementing a simple string manipulation):

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@SpringBootApplication
+public class Application {
+  public static void main(String[] args) {
+    SpringApplication.run(Application.class, args);
+  }
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+  @Bean
+  public Function<Flux<String>, Flux<String>> uppercase() {
+    return flux -> flux.map(value -> value.toUpperCase());
+  }
+}
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Sample Projects

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