io.scalecube.services.examples.helloworld.Example3 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of scalecube-services-examples Show documentation
The newest version!
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.BidiGreetingImpl;
import io.scalecube.services.examples.helloworld.service.api.BidiGreetingService;
import io.scalecube.services.transport.rsocket.RSocketServiceTransport;
import io.scalecube.transport.netty.websocket.WebsocketTransportFactory;
import reactor.core.publisher.Flux;

/**
 * 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 BidiGreetingService instance.
 */
public class Example3 {

  /**
   * 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 BidiGreetingImpl()));

    // Create service proxy
    BidiGreetingService service = seed.call().api(BidiGreetingService.class);

    // Execute the services and subscribe to service events
    service
        .greeting(Flux.fromArray(new String[] {"joe", "dan", "roni"}))
        .doOnNext(System.out::println)
        .blockLast();

    seed.close();
    ms.close();
  }
}