Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

Get in touch with me:

oren@ravendb.net

+972 52-548-6969

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Oct 19 2017

Giving Demeter PTSD

time to read 1 min | 113 words

The law of Demeter goes like this, a method m of an object O may only invoke the methods of the following kinds of objects:

O itself
m's parameters
Any objects created/instantiated within m
O's direct component objects
A global variable, accessible by O, in the scope of m

And then we have this snippet from a 1,741 lines index that was sent to us to diagnose some performance problems.

There are at least two separate leaks of customer data here, by the way, can you spot them?

This is it for this post, I really don’t have anything else left to say.

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humor

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20 Oct 2017
12:34 PM

Laurent Kempé

I had to check the date, I thought we were 1st of April

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FUTURE POSTS

Partial writes, IO_Uring and safety - about one day from now
Configuration values & Escape hatches - 4 days from now
What happens when a sparse file allocation fails? - 6 days from now
NTFS has an emergency stash of disk space - 8 days from now
Challenge: Giving file system developer ulcer - 11 days from now

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Challenge (77):
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22 Jan 2025 - What does this code do?
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