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
710
Programming flying robots with JavaScript
felixge
2
890
Programming flying robots with JavaScript
felixge
0
540
Programming an AR Drone Firmware with JS (de)
felixge
1
570
Faster than C?
felixge
1
1.2k
Flying robots over a 10.000 mile distance with JavaScript.
felixge
0
440
Faster than C?
felixge
1
570
The power of node.js (with quadcopters)
felixge
0
450
Faster than C?
felixge
0
370
Other Decks in Technology
See All in Technology
一休.comレストランにおけるRustの活用
kymmt90
3
640
プロダクトエンジニアが活躍する環境を作りたくて 事業責任者になった話 ~プロダクトエンジニアの行き着く先~
gimupop
1
560
Datachain会社紹介資料(2024年11月) / Company Deck
datachain
4
17k
AI長期記憶システム構築のための LLMマルチエージェントの取り組み / Awarefy-LLM-Multi-Agent
iktakahiro
2
250
ジョブマッチングサービスにおける相互推薦システムの応用事例と課題
hakubishin3
3
550
徹底比較!HA Kubernetes ClusterにおけるControl Plane LoadBalancerの選択肢
logica0419
2
110
AWS re:Invent 2024 Kansai Standby
hiroramos4
PRO
0
130
Forget efficiency – Become more productive without the stress
ufried
0
210
マルチモーダルRAGやってみた
tanimon
0
110
What to do after `laravel new`
mattstauffer
0
120
LINEヤフー株式会社における音声言語情報処理AI研究開発@SP/SLP研究会 2024.10.22
lycorptech_jp
PRO
2
240
株式会社ドクターズプライム 会社紹介資料 - エンジニア向け
drsprime
0
190
Featured
See All Featured
GraphQLの誤解/rethinking-graphql
sonatard
67
10k
Testing 201, or: Great Expectations
jmmastey
38
7.1k
Unsuck your backbone
ammeep
668
57k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
25
1.8k
How GitHub (no longer) Works
holman
310
140k
Embracing the Ebb and Flow
colly
84
4.5k
Building Your Own Lightsaber
phodgson
102
6.1k
Why You Should Never Use an ORM
jnunemaker
PRO
53
9k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
228
52k
10 Git Anti Patterns You Should be Aware of
lemiorhan
654
59k
Java REST API Framework Comparison - PWX 2021
mraible
PRO
28
8.1k
The Invisible Side of Design
smashingmag
297
50k
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