@Override
    public Builder retryer(final Retryer retryer) {
      this.retryer = checkNotNull(retryer, "Argument retryer must be not null");
      return this;
    }
Sets retryer.

@param retryer retryer
@return this builder
vertx/feign-vertx/src/main/java/feign/VertxFeign.java