public BlockCallbackDescriptor(String method, String classname, String file, int line) {
   this.method = method;
   this.classname = classname;
   this.callbackName = InvocationMethodFactory.getBlockCallbackName(classname, method);
   this.file = file;
   this.line = line;
 }
 public InvokerDescriptor(
     String rubyName,
     String javaName,
     String classname,
     Arity arity,
     StaticScope scope,
     CallConfiguration callConfig,
     String file,
     int line) {
   this.rubyName = rubyName;
   this.javaName = javaName;
   this.classname = classname;
   this.invokerName = InvocationMethodFactory.getCompiledCallbackName(classname, javaName);
   this.arity = arity;
   this.scope = scope;
   this.callConfig = callConfig;
   this.file = file;
   this.line = line;
 }