code: package io.ray.api.call;
  
  import io.ray.api.ActorHandle;
  import io.ray.api.Ray;
  import io.ray.api.function.RayFuncVoid;
  import io.ray.api.options.CallOptions;
  
  /** A helper to call java actor method which doesn't have a return value. */
  public class VoidActorTaskCaller {
    private final ActorHandle actor;
    private final RayFuncVoid func;
    private final Object[] args;
    private CallOptions.Builder builder = new CallOptions.Builder();
  
    public VoidActorTaskCaller(ActorHandle actor, RayFuncVoid func, Object[] args) {
      this.actor = actor;
      this.func = func;
      this.args = args;
    }
  
    public VoidActorTaskCaller setConcurrencyGroup(String name) {
      builder.setConcurrencyGroupName(name);
      return self();
    }
  
    private VoidActorTaskCaller self() {
      return this;
    }
  
    /** Execute a function remotely. */
    public void remote() {
      Ray.internal().callActor(actor, func, args, builder.build());
    }
  }
  