code: package io.ray.api.concurrencygroup.annotations;
  
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Inherited;
  import java.lang.annotation.Repeatable;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  
  @Target(ElementType.TYPE)
  @Inherited
  @Repeatable(DefConcurrencyGroups.class)
  @Retention(RetentionPolicy.RUNTIME)
  public @interface DefConcurrencyGroup {
  
    public String name() default "";
  
    public int maxConcurrency() default 1;
  }
  