code: static InvocationStub from(SPFServiceDescriptor descriptor, Target target) {
  		Utils.notNull(target, "target must not be null");
  		Utils.notNull(descriptor, "descriptor must not be null");
  
  		return new InvocationStub(descriptor, target);
  	}
docs: Creates an invocation stub to send service invocation requests to a
  target {@link Target} providing the name and the parameter list. The
  object is created from a {@link ServiceDescriptor} containing the
  required details.
  
  @param target
  - the target who the service invocation requests will be
  dispatched to.
  @param descriptor
  - the {@link ServiceDescriptor} of the service whose methods
  to invoke.
  @return a {@link InvocationStub} to perform invocations of remote
  services.