Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Swift warm up NSUUID
Search
Johnlin
September 04, 2018
Programming
0
110
Swift warm up NSUUID
Johnlin
September 04, 2018
Tweet
Share
More Decks by Johnlin
See All by Johnlin
用 MLIR 實作 一個 Ruby IR (intermediate representation)
johnlinvc
0
160
Unearth Ruby builtin Gems 發掘 Ruby 的內建 Gems
johnlinvc
0
280
Ruby 型別檢查工具簡介
johnlinvc
0
500
Swift Actor 實作探索
johnlinvc
0
160
用 mruby 來寫跨平台工具
johnlinvc
0
85
Actor model 簡介
johnlinvc
0
200
一起玩 Helm 3
johnlinvc
1
120
為什麼 App 卡卡的
johnlinvc
2
1.2k
如何使用 byebug 來除錯 Ruby 程式
johnlinvc
0
220
Other Decks in Programming
See All in Programming
『毎日の移動』を支えるGoバックエンド内製開発
yutautsugi
2
290
Cursorハンズオン実践!
eltociear
2
1.2k
なぜGoのジェネリクスはこの形なのか? - Featherweight Goが明かす設計の核心
qualiarts
0
260
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
490
kiroとCodexで最高のSpec駆動開発を!!数時間で web3ネイティブなミニゲームを作ってみたよ!
mashharuki
0
930
When Dependencies Fail: Building Antifragile Applications in a Fragile World
selcukusta
0
110
O Que É e Como Funciona o PHP-FPM?
marcelgsantos
0
200
TFLintカスタムプラグインで始める Terraformコード品質管理
bells17
2
450
CSC509 Lecture 07
javiergs
PRO
0
250
Developer Joy - The New Paradigm
hollycummins
1
370
bootcamp2025_バックエンド研修_WebAPIサーバ作成.pdf
geniee_inc
0
130
組込みだけじゃない!TinyGo で始める無料クラウド開発入門
otakakot
2
380
Featured
See All Featured
Java REST API Framework Comparison - PWX 2021
mraible
34
8.9k
Thoughts on Productivity
jonyablonski
70
4.9k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
127
54k
Imperfection Machines: The Place of Print at Facebook
scottboms
269
13k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
23
1.5k
How To Stay Up To Date on Web Technology
chriscoyier
791
250k
Mobile First: as difficult as doing things right
swwweet
225
10k
Typedesign – Prime Four
hannesfritz
42
2.8k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
Done Done
chrislema
185
16k
Art, The Web, and Tiny UX
lynnandtonic
303
21k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
48
9.7k
Transcript
Swift ఔࣜখ NSUUID John Lin
ॄኄੋ UUID • ௨༻།Ұࣝผᛰ(Universally Unique Identifier) • 550e8400-e29b-41d4-a716-446655440000 • 32
ݸ16 ਐҐᏐ= 16byte = 128 bitɼ༗ 3.4 * 10 ^ 38 छ߹
UUID ֨ࣜ • xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx • ࣈᏐత֨ࣜੋ 8-4-4-4-12 • ଖதၷݸํੋ༻ိදࣔ൛ຊతɻ
UUID ൛ຊ • લ༗ޒݸ൛ຊɼၷछᏓᱪɻ • ࠷ৗ༻తੋ 1 4
UUID1 • timestamp (60 bit) + clock_seq(14bit) + version(6bit) +
MAC address(48bit) = 128bit • ࣌ؒੋኺ 1582/10/15T00:00 ։࢝ࢉʢެ㑕։࢝)ɼ 㑌100 ns ࢉҰݸᄸҐ
UUID 䉰 • timestamp (60 bit) + clock_seq(14bit) + version(6bit)
+ MAC address(48bit) = 128bit • ࡏಉҰػث্ɼ100 ಸඵ㚎ᬋػతൣᅴ༗ 14 bit ༗త࣌ީ။㗞ੜҰᒬతUUIDɼҝ䉰
ੜዬ • Ұݸ൝্༗ࡾेݸਓɼ༗ࢸগၷݸਓಉҰఱੜతػ ੋଟগ䏆ʁ • (1/365)^30 ?
ੜዬ • Ұݸ൝্༗ࡾेݸਓɼ༗ࢸগၷݸਓಉҰఱੜతػ ੋଟগ䏆ʁ • ਖ਼֬తࢉ๏ੋ༻ 1 ݮᎃશᔒ༗ॏෳతػɻब ੋ •
ࡏ 30 ݸਓతگԼେੋ 70 %
UUID1 䉰 • timestamp (60 bit) + clock_seq(14bit) + version(6bit)
+ MAC address(48bit) = 128bit • ࡏಉҰػث্ɼ100 ಸඵ㚎ᬋػతൣᅴ༗ 14 bit ༗త࣌ީ။㗞ੜҰᒬతUUIDɼҝ䉰 • ༻ੜዬɼ100 ಸඵ㚎㗞ੜ 18 ݸ UUID ब༗ 1 % తػ။䉰ɼෆଠద߹շ༻
UUID4 • Swift 㚎ݐత NSUUID & UUID ༗ UUID4 •
random (122 bit) + version (6bit) = 128 bit • 䉰తػখଟ • 㗞ੜ 103 ஹݸ UUID4 ။༗ 10ԯ೭Ұతػ။䉰
NSUUID
UUID • ޭೳ NSUUID Ұᒬɼෆաੋ Struct ൛తɻ • ݐٞ༻Ṝݸൺֱ҆શɻ
݁ • UUID 4 䉰తػᕝత • ༗धཁᘐಛ ID త࣌ީब༻㠧ɼൺࣗݾrandom ؆
ᄸɻ
Q&A
፮ᐔػ • http://slot.miario.com/machines/150067