Found some interesting reading on autonomic computing.
Catching up on my Kevlin Henney:
- Agility ≠ Speed – Kevlin Henney
- Refactoring to Immutability – Kevlin Henney
- Talking Architecture With Kevlin Henney
- ‘Declarative Thinking, Declarative Practice’ – Kevlin Henney [ ACCU 2016 ]
In Database Design 25 – Surrogate Key and Natural Key the presenter Caleb Curry agrees with my view that if you expose your surrogate keys they become natural keys. See around t=5:00.
I’m reading RESTful Web Services Cookbook and on page 17 the author gives this example:
# Request POST /user/smith HTTP/1.1 Host: www.example.org Content-Type: application/xml;charset=UTF-8 Slug: Home Address <address><street>1, Main Street</street><city>Some City</city></address> # Response HTTP/1.1 201 Created Location: http://www.example.org/user/smith/address/home_address ...
There are two problems with this: the first is that “POST /user/smith” has the semantics “register address”, so it would be better if that was clear; the second is that some of the input to the business process is in the XML payload, while some of it is in the HTTP headers (viz Slug). It would be better if all the input was in the payload.
So how would I design this service?
# Request POST /api/v1/processor HTTP/1.1 Host: www.example.org Content-Type: application/x-www-form-urlencoded action=register_address&user=smith&street=Main+Street&city=Some+City&type=home_address # Response HTTP/1.1 303 See Other Location: http://www.example.org/user/smith#home_address
Actually in my designs the /api/v1/processor could be anything, including /user/smith, because the business process is indicated in the request ‘action’ with is submitted with POST. Just like God intended. Idempotency, optimistic concurrency control, authentication, authorisation, auditing, version control, all that good stuff implemented with business logic via business process for ‘register_address’.
A well designed website: Nielsen Norman Group… :)
Today via Hacker News: 136 facts every web dev should know before they burn out and turn to landscape painting or nude modelling.
Server-routed sites aren’t perfect, but there’s a lot less that can go wrong.
Today via r/programming: CSS Grid or Flexbox? How to pick between the two CSS layout systems.
Today via r/programming: JSON Schema bundling finally formalised.
This is a neat CSS technique: Axiomatic CSS and Lobotomized Owls.