Action at a distance

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Andrew Solomon

How action at a distance appears in software engineering - and why to avoid it like the plague!

Software

Andrew Solomon London Perl Meetup #1 2018 @ Zoopla Version 1.0
Action
at a
distance
What’s that got to do with me?

Action at a distance
Gravitational Field

Action at a distance
Gravitational Field
Quantum Entanglement

Action at a distance
Gravitational Field
Quantum Entanglement
Mason Web Framework

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

The Goal
I provide a url
I get content in return

The Data we give Mason
Green = has a handler

The Action Mason takes
Find the handler
descend(X,for-sale/edgeware-rd) , handler(X).

The data...
child(for-sale,for-sale/oxford).
child(for-sale,for-sale/london).
child(for-sale/london,for-sale/w10).
child(for-sale/w10,for-sale/edgeware-rd).
child(to-rent,to-rent/london).
handler(for-sale).
handler(for-sale/london).

… in Prolog
descend(X,Y) :- child(X,Y).
descend(X,Y) :- child(X,Z),
descend(Z,Y).

The problem
1
We determine the content of the page from
the url by database + logic

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

Example - The Doppelganger of Ingleton
https://www.telegraph.co.uk/news/features/10905575/Britains-doppelganger-place-names.html

Mojo
Passing controller objects into the model

PSGI
Performing path modifications in outer
layers

Everywhere
Doing things outside the appropriate
context

Code reviewer
The Ultimatum
Just because you can...

Code reviewer
The Ultimatum
Just because you can…
Doesn’t mean you should.

Code reviewer
The Ultimatum
Just because you can…
Doesn’t mean you should.
End action at a distance

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Action at a distance

1. Andrew Solomon London Perl Meetup #1 2018 @ Zoopla Version 1.0 Action at a distance What’s 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).

9. meta-Perl implementation...

10. The data... child(for-sale,for-sale/oxford). child(for-sale,for-sale/london). child(for-sale/london,for-sale/w10). child(for-sale/w10,for-sale/edgeware-rd). child(to-rent,to-rent/london). handler(for-sale). handler(for-sale/london).

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

18.

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… Doesn’t mean you should.

25. Code reviewer The Ultimatum Just because you can… Doesn’t mean you should. End action at a distance

26. Raiden - Turning over a new leaf at Zoopla

27. Thank you.