Microsoft Azure Functions

@Component (1)
public class MyAzureFunction {

	// Plain Spring bean - not a Spring Cloud Functions!
	@Autowired private Function<String, String> uppercase; (2)

	// The FunctionCatalog leverages the Spring Cloud Function framework.
	@Autowired private FunctionCatalog functionCatalog; (2)

	@FunctionName("spring") (3)
	public String plainBean( (4)
			@HttpTrigger(name = "req",
				methods = { HttpMethod.POST },
				authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
				ExecutionContext context) {

		return this.uppercase.apply(request.getBody().get());
	}

	@FunctionName("scf") (3)
	public String springCloudFunction( (5)
			@HttpTrigger(name = "req",
			methods = { HttpMethod.POST },
			authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
			ExecutionContext context) {

		// Use SCF composition. Composed functions are not just spring beans but SCF such.
		Function composed = this.functionCatalog.lookup("reverse|uppercase"); (6)

		return (String) composed.apply(request.getBody().get());
	}
}

@SpringBootApplication (1)
public class HttpTriggerDemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(HttpTriggerDemoApplication.class, args);
	}

	@Bean
	public Function<String, String> uppercase() { (2)
		return payload -> payload.toUpperCase();
	}

	@Bean
	public Function<String, String> reverse() { (2)
		return payload -> new StringBuilder(payload).reverse().toString();
	}
}

@FunctionName("myfunction")
public String execute(
	@HttpTrigger(name = "req",
		methods = { HttpMethod.POST },
		authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
		ExecutionContext context) {

	Message message =
		(Message) AzureFunctionUtil.enhanceInputIfNecessary(request.getBody().get(), context); (1)

	return this.uppercase.apply(message);
}

@Bean
public Function<Message<String>, String> uppercase(JsonMapper mapper) {
	return message -> {
		String value = message.getPayload();
		ExecutionContext context =
			(ExecutionContext) message.getHeaders().get(AzureFunctionUtil.EXECUTION_CONTEXT); (1)
		. . .
	}
}

<plugin>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-maven-plugin</artifactId>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot.experimental</groupId>
			<artifactId>spring-boot-thin-layout</artifactId>
		</dependency>
	</dependencies>
</plugin>

{
	"version": "2.0",
	"extensionBundle": {
		"id": "Microsoft.Azure.Functions.ExtensionBundle",
		"version": "[4.*, 5.0.0)"
	}
}