content: /*
   * Copyright (C) 2018-2025 Lightbend Inc. <https://www.lightbend.com>
   */
  
  package akka.cluster.typed;
  
  import akka.actor.testkit.typed.javadsl.TestProbe;
  import akka.actor.typed.ActorSystem;
  import akka.cluster.ClusterEvent;
  import com.typesafe.config.Config;
  import com.typesafe.config.ConfigFactory;
  import java.util.concurrent.TimeUnit;
  import org.junit.Test;
  import org.scalatestplus.junit.JUnitSuite;
  
  public class ClusterApiTest extends JUnitSuite {
  
    @Test
    public void joinLeaveAndObserve() throws Exception {
      Config config =
          ConfigFactory.parseString(
              "akka.actor.provider = cluster \n"
                  + "akka.remote.artery.canonical.port = 0 \n"
                  + "akka.remote.artery.canonical.hostname = 127.0.0.1 \n"
                  + "akka.cluster.jmx.multi-mbeans-in-same-jvm = on \n"
                  + "akka.coordinated-shutdown.terminate-actor-system = off \n"
                  + "akka.coordinated-shutdown.run-by-actor-system-terminate = off \n");
  
      ActorSystem<?> system1 =
          ActorSystem.wrap(akka.actor.ActorSystem.create("ClusterApiTest", config));
      ActorSystem<?> system2 =
          ActorSystem.wrap(akka.actor.ActorSystem.create("ClusterApiTest", config));
  
      try {
        Cluster cluster1 = Cluster.get(system1);
        Cluster cluster2 = Cluster.get(system2);
  
        TestProbe<ClusterEvent.ClusterDomainEvent> probe1 = TestProbe.create(system1);
  
        cluster1.subscriptions().tell(new Subscribe<>(probe1.ref().narrow(), SelfUp.class));
        cluster1.manager().tell(new Join(cluster1.selfMember().address()));
        probe1.expectMessageClass(SelfUp.class);
  
        TestProbe<ClusterEvent.ClusterDomainEvent> probe2 = TestProbe.create(system2);
        cluster2.subscriptions().tell(new Subscribe<>(probe2.ref().narrow(), SelfUp.class));
        cluster2.manager().tell(new Join(cluster1.selfMember().address()));
        probe2.expectMessageClass(SelfUp.class);
  
        cluster2.subscriptions().tell(new Subscribe<>(probe2.ref().narrow(), SelfRemoved.class));
        cluster2.manager().tell(new Leave(cluster2.selfMember().address()));
  
        probe2.expectMessageClass(SelfRemoved.class);
      } finally {
        system1.terminate();
        system1.getWhenTerminated().toCompletableFuture().get(5, TimeUnit.SECONDS);
        system2.terminate();
        system2.getWhenTerminated().toCompletableFuture().get(5, TimeUnit.SECONDS);
      }
    }
  }
  