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
150
Unearth Ruby builtin Gems 發掘 Ruby 的內建 Gems
johnlinvc
0
270
Ruby 型別檢查工具簡介
johnlinvc
0
490
Swift Actor 實作探索
johnlinvc
0
160
用 mruby 來寫跨平台工具
johnlinvc
0
82
Actor model 簡介
johnlinvc
0
190
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
210
Other Decks in Programming
See All in Programming
MCPとデザインシステムに立脚したデザインと実装の融合
yukukotani
4
1.4k
今だからこそ入門する Server-Sent Events (SSE)
nearme_tech
PRO
3
190
AWS発のAIエディタKiroを使ってみた
iriikeita
1
180
Rancher と Terraform
fufuhu
2
400
基礎から学ぶ大画面対応(Learning Large-Screen Support from the Ground Up)
tomoya0x00
0
430
print("Hello, World")
eddie
2
530
Performance for Conversion! 分散トレーシングでボトルネックを 特定せよ
inetand
0
140
Design Foundational Data Engineering Observability
sucitw
3
190
AIコーディングAgentとの向き合い方
eycjur
0
270
パッケージ設計の黒魔術/Kyoto.go#63
lufia
3
430
私の後悔をAWS DMSで解決した話
hiramax
4
210
Testing Trophyは叫ばない
toms74209200
0
870
Featured
See All Featured
It's Worth the Effort
3n
187
28k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
4 Signs Your Business is Dying
shpigford
184
22k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.6k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3.1k
How to train your dragon (web standard)
notwaldorf
96
6.2k
Embracing the Ebb and Flow
colly
87
4.8k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
23
1.4k
Into the Great Unknown - MozCon
thekraken
40
2k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.5k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
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