io.scalecube.services.examples.helloworld.Example1 Maven / Gradle / Ivy
package io.scalecube.services.examples.helloworld;
import io.scalecube.services.Address;
import io.scalecube.services.Microservices;
import io.scalecube.services.Microservices.Context;
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;
import io.scalecube.transport.netty.websocket.WebsocketTransportFactory;
/**
* 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 with no members
Microservices seed =
Microservices.start(
new Context()
.discovery(
serviceEndpoint ->
new ScalecubeServiceDiscovery()
.transport(cfg -> cfg.transportFactory(new WebsocketTransportFactory()))
.options(opts -> opts.metadata(serviceEndpoint)))
.transport(RSocketServiceTransport::new));
final Address seedAddress = seed.discoveryAddress();
// Construct a ScaleCube node which joins the cluster hosting the Greeting Service
Microservices ms =
Microservices.start(
new Context()
.discovery(
endpoint ->
new ScalecubeServiceDiscovery()
.transport(cfg -> cfg.transportFactory(new WebsocketTransportFactory()))
.options(opts -> opts.metadata(endpoint))
.membership(cfg -> cfg.seedMembers(seedAddress.toString())))
.transport(RSocketServiceTransport::new)
.services(new GreetingServiceImpl()));
// 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.close();
ms.close();
}
}