io.scalecube.services.examples.helloworld.Example1 Maven / Gradle / Ivy
package io.scalecube.services.examples.helloworld;
import io.scalecube.services.Microservices;
import io.scalecube.services.discovery.ScalecubeServiceDiscovery;
import io.scalecube.services.examples.helloworld.service.GreetingServiceImpl;
import io.scalecube.services.examples.helloworld.service.api.GreetingsService;
import io.scalecube.services.transport.rsocket.RSocketServiceTransport;
/**
* The Hello World project is a time-honored tradition in computer programming. It is a simple
* exercise that gets you started when learning something new. Let’s get started with ScaleCube!
*
* the example starts 2 cluster member nodes. 1. seed is a member node and holds no services of
* its own. 2. The microservices variable is a member that joins seed member and
* provision GreetingService instance.
*/
public class Example1 {
/**
* Start the example.
*
* @param args ignored
*/
public static void main(String[] args) {
// ScaleCube Node node with no members
Microservices seed =
Microservices.builder()
.discovery(ScalecubeServiceDiscovery::new)
.transport(RSocketServiceTransport::new)
.startAwait();
// Construct a ScaleCube node which joins the cluster hosting the Greeting Service
Microservices ms =
Microservices.builder()
.discovery(
serviceEndpoint ->
new ScalecubeServiceDiscovery(serviceEndpoint)
.options(
opts ->
opts.membership(
cfg -> cfg.seedMembers(seed.discovery().address()))))
.transport(RSocketServiceTransport::new)
.services(new GreetingServiceImpl())
.startAwait();
// Create service proxy
GreetingsService service = seed.call().api(GreetingsService.class);
// Execute the services and subscribe to service events
service.sayHello("joe").subscribe(consumer -> System.out.println(consumer.message()));
seed.onShutdown().block();
ms.onShutdown().block();
}
}