Action at a distance
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This document discusses the concept of "action at a distance" as it relates to web application frameworks. It gives examples of how Mason, a Perl web framework, retrieves and passes data between distant parts of the application. Specifically, it notes that Mason sometimes stores data in global variables or retrieves it in non-obvious places as it traverses the application tree. It warns that just because a framework allows distant actions, it does not mean those actions should be used, and advocates ending the practice of distant actions in code.
Action at a distance
- 1. Andrew Solomon London Perl Meetup #1 2018 @ Zoopla Version 1.0 Action at a distance Whats that got to do with me?
- 2. Action at a distance Gravitational Field
- 3. Action at a distance Gravitational Field Quantum Entanglement
- 4. Action at a distance Gravitational Field Quantum Entanglement Mason Web Framework
- 5. Confidential Customized for Lorem Ipsum LLC Version 1.0 Summary The goal The data The action The code The problem Examples The manifestations The ultimatum
- 6. The Goal I provide a url I get content in return
- 7. The Data we give Mason Green = has a handler
- 8. The Action Mason takes Find the handler descend(X,for-sale/edgeware-rd) , handler(X).
- 11. in Prolog descend(X,Y) :- child(X,Y). descend(X,Y) :- child(X,Z), descend(Z,Y).
- 12. The problem 1 We determine the content of the page from the url by database + logic
- 13. The problem 1 We determine the content of the page from the url by database + logic 2 The same data is required for multiple descendents of a Mason node
- 14. The problem 1 We determine the content of the page from the url by database + logic 2 The same data is required for multiple descendents of a Mason node 3 We wind up storing this data in global variables as we traverse the Mason tree
- 15. The problem 1 We determine the content of the page from the url by database + logic 2 The same data is required for multiple descendents of a Mason node 3 We wind up storing this data in global variables as we traverse the Mason tree 4 Data retrieved and munged in several non- obvious places before arriving at the template.
- 16. Action at a distance The problem
- 17. Example - The Doppelganger of Ingleton https://www.telegraph.co.uk/news/features/10905575/Britains-doppelganger-place-names.html
- 19. Manifestations
- 20. Mojo Passing controller objects into the model
- 21. PSGI Performing path modifications in outer layers
- 22. Everywhere Doing things outside the appropriate context
- 23. Code reviewer The Ultimatum Just because you can...
- 24. Code reviewer The Ultimatum Just because you can Doesnt mean you should.
- 25. Code reviewer The Ultimatum Just because you can Doesnt mean you should. End action at a distance
- 26. Raiden - Turning over a new leaf at Zoopla
- 27. Thank you.
Editor's Notes
- http://thelifeofpsi.com/wp-content/uploads/2013/09/Schr%C3%B6dingers-Cat-3.jpg
- http://miriadna.com/desctopwalls/images/max/Rising-gold-sun.jpg