public string GetCollapserPropertiesCacheKey(IHystrixCollapserKey collapserKey, HystrixCollapserPropertiesSetter setter)
 {
     return null;
 }
 public IHystrixCollapserProperties GetCollapserProperties(IHystrixCollapserKey collapserKey, HystrixCollapserPropertiesSetter setter)
 {
     throw new InvalidOperationException();
 }