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
Domains in node 0.8
Search
Felix Geisendörfer
June 29, 2012
Technology
8
5.4k
Domains in node 0.8
A quick presentation I gave at HolidayExtras on using the new domain feature in node.js 0.8.
Felix Geisendörfer
June 29, 2012
Tweet
Share
More Decks by Felix Geisendörfer
See All by Felix Geisendörfer
tus.io - Resumable File Uploads (Lightning Talk)
felixge
2
730
Programming flying robots with JavaScript
felixge
2
910
Programming flying robots with JavaScript
felixge
0
550
Programming an AR Drone Firmware with JS (de)
felixge
1
580
Faster than C?
felixge
1
1.2k
Flying robots over a 10.000 mile distance with JavaScript.
felixge
0
450
Faster than C?
felixge
1
590
The power of node.js (with quadcopters)
felixge
0
460
Faster than C?
felixge
0
380
Other Decks in Technology
See All in Technology
「完全に理解したTalk」完全に理解した
segavvy
1
270
SpiderPlus & Co. エンジニア向け会社紹介資料
spiderplus_cb
0
270
MasterMemory v3 最速確認会
yucchiy
0
290
I could be Wrong!! - Learning from Agile Experts
kawaguti
PRO
8
1.5k
組織に自動テストを書く文化を根付かせる戦略(2024冬版) / Building Automated Test Culture 2024 Winter Edition
twada
PRO
25
6.9k
スケールし続ける事業とサービスを支える組織とアーキテクチャの生き残り戦略 / The survival strategy for Money Forward’s engineering.
moneyforward
0
210
[JAWS-UG新潟#20] re:Invent2024 -CloudOperationsアップデートについて-
shintaro_fukatsu
0
140
Agentic RAG with LangGraph
atsushii
0
110
Denoで作るチーム開発生産性向上のためのCLIツール
sansantech
PRO
0
120
生成AIによるテスト設計支援プロセスの構築とプロセス内のボトルネック解消の取り組み / 20241220 Suguru Ishii
shift_evolve
0
160
シフトライトなテスト活動を適切に行うことで、無理な開発をせず、過剰にテストせず、顧客をビックリさせないプロダクトを作り上げているお話 / Shift Right
nihonbuson
2
730
株式会社ログラス − エンジニア向け会社説明資料 / Loglass Comapany Deck for Engineer
loglass2019
3
33k
Featured
See All Featured
A designer walks into a library…
pauljervisheath
205
24k
Designing for Performance
lara
604
68k
Raft: Consensus for Rubyists
vanstee
137
6.7k
Designing for humans not robots
tammielis
250
25k
Building Adaptive Systems
keathley
38
2.3k
The Power of CSS Pseudo Elements
geoffreycrofte
73
5.4k
Being A Developer After 40
akosma
89
590k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
59k
Music & Morning Musume
bryan
46
6.3k
Building Better People: How to give real-time feedback that sticks.
wjessup
366
19k
Building a Scalable Design System with Sketch
lauravandoore
460
33k
Reflections from 52 weeks, 52 projects
jeffersonlam
348
20k
Transcript
Domains in node 0.8 A quick introduction Freitag, 29. Juni
12
1 var app = require('express')(); 2 3 app.get('/search', function(req, res,
next) { 4 doSearch(req.params, function(err, result) { 5 if (err) return next(err); 6 7 // trying to access non-existing property 8 if (result.foo.bar) { 9 console.log('does not work'); 10 } 11 }); 12 }); 13 14 app.listen(8080); Freitag, 29. Juni 12
/Users/Felix/Desktop/domains/example.js:14 if (result.foo.bar) { ^ TypeError: Cannot read property 'bar'
of undefined at /Users/Felix/Desktop/domains/example.js:14:19 at doSearch (/Users/Felix/Desktop/domains/example.js:3:5) at process.startup.processNextTick.process._tickCallback (node.js:244:9) Freitag, 29. Juni 12
1 process.on('uncaughtException', function(err) { 2 // Keeps the process from
crashing 3 // But does not let you find out which `req` 4 // was causing the `err` 5 }); Freitag, 29. Juni 12
Domains to the rescue! Freitag, 29. Juni 12
1 var createDomain = require('domain').create; 2 3 app.use(function(req, res, next)
{ 4 var domain = createDomain(); 5 6 domain.on('error', function(err) { 7 // alternative: next(err) 8 res.statusCode = 500; 9 res.end(err.message + '\n'); 10 11 domain.dispose(); 12 }); 13 14 domain.enter(); 15 next(); 16 }); Freitag, 29. Juni 12
$ curl -i localhost:8080/search HTTP/1.1 500 Internal Server Error X-Powered-By:
Express Date: Fri, 29 Jun 2012 10:50:18 GMT Connection: keep-alive Transfer-Encoding: chunked Cannot read property 'bar' of undefined Freitag, 29. Juni 12
Questions? Freitag, 29. Juni 12
Hiring node.js developers @ marcgreenstock @dan_jenkins Freitag, 29. Juni 12