spring-cloud-function/spring-cloud-function-deployer

Spring Cloud Function Deployer is an library for building apps that can deploy functions packaged as jars. It can deploy a basic Spring Cloud Function app from a jar with locally cached dependencies in about 500ms (compared to 1500ms for the same application launched from cold). It can be used in a pool as a "warm" JVM to deploy functions quicker than they could be started from scratch. Example usage:

@SpringBootApplication
@EnableFunctionDeployer
public class FunctionApplication {

	public static void main(String[] args) throws IOException {
		new ApplicationBootstrap().run(FunctionApplication.class, args);
	}

}

There is a main class in the jar that alread looks like this. You can use it like that or you can create your own copy if you want to customize it. The ApplicationBootstrap is a utility that replaces SpringApplication, creating a class loader hierarchy that works with the function configuration. It needs to be launched with configuration for the FunctionProperties:

Option	Description
function.location	Mandatory archive location(s) for building the classpath of the function.
function.bean	Mandatory bean class or name (if function.main is provided) to create the function. If multi-valued, the function is composed (outputs piped to inputs)
function.main	The main @SpringBootApplication to launch (optional).