Intro to Node.js (German)
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This document discusses Node.js and digital transformation. It notes that Node.js is used by companies like Netflix, Tinder, and NASA. Node.js complements existing systems and its uses include authentication, authorization, data transformation, and presentation of HTML. Node.js is well-suited for modern web applications that need to gather and push real-time data from different sources to many clients. Its advantages include using JavaScript, asynchronous and non-blocking I/O, and the V8 JavaScript engine. However, it is not suitable for CPU-intensive tasks.
Intro to Node.js (German)
- 1. @dkhan Netflix, Tinder, NASA – Node.js und die Digitale Transformation Daniel Khan Node.js Technology Lead
- 2. Daniel Khan • @dkhan • daniel.khan@dynatrace.com • Node.js Technology Lead
- 4. @dkhan Gegründet in Linz 2006 210 Mitarbeiter in Linz Weltweit ca. 2.000 #2 Arbeitgeber Ranking
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- 15. Complete Transaction Coverage Browser / Native Mobile Java/ .NET Performance Warehouse PurePath Collector Dynatrace Server Dynatrace Client Sessions Store Exported Session Offline Session Analysis Web Server/ PHP C++, VB, ADK CICS Mainframe z/OS MQ/ESB Database
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- 21. @dkhan Quelle: Indeed Job Trends
- 22. @dkhan Relativ! Quelle: Indeed Job Trends
- 23. @dkhan Node@Dynatrace | März 2015
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- 38. @dkhan Bestehende Kunden Nicht unbedingt Startups
- 39. Node Foundation
- 42. We see ourselves as a technology company with a banking licenseMichael Corbat PDG de Citi
- 43. Nike has many more software developers in Oregon than apparel designers.* *from Dynatrace Perform 2015
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- 46. @dkhan November 2016 “Wir sehen Node.js überall in den USA’
- 48. @dkhan Node.js komplementiert bestehende Systeme
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- 55. @dkhan Aber warum ausgerechnet Node.js?
- 56. @dkhan JavaScript • Easy to learn / easy to find developers • No language boundaries between frontend and backend • Easy to deploy and rollback • Fast development cycles PayPal built a web app side by side in Node and Java and the Node version was: • Built almost twice as fast with fewer people • Written in 33% fewer lines of code • Constructed with 40% fewer files Source: https://www.paypal-engineering.com/2013/11/22/node-js-at-paypal/
- 57. @dkhan Performance • Google V8 JavaScript Engine • Non-Blocking I/O • Asynchronous event based execution Node.js shines in modern web-connected applications where it needs to gather data from different sources, consolidate it and push it to many clients in real-time. Never(!) use it for CPU-bound tasks!
- 58. Source: PayPal Double the requests per second vs. the Java application. 35% decrease in the average response time
- 59. @dkhan Usecases • Authentifizierung / Autorisierung • Proxy / Vermittler • Datentransformation • Präsentation (HTML)
- 60. Node.js in a Nutshell
- 61. @dkhan Node Standard Library Node Bindings V8 Thread Pool Event Loop JavaScript C++
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- 65. DatabaseBrowser Java Application Traditional approach
- 66. DatabaseBrowser Node.js Application IO Threads Nodes approach
- 67. @dkhan “Node.js ist Single Threaded”
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- 77. @dkhan Erste Schritte zu einer Node.js Applikation
- 78. @dkhan Über 350.000 Module auf npm
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- 84. @dkhan • JavaScript ist einfach • Dynamisch typisiert • Einfache API für asynchrone Tasks • Erstklassige I/O Performance • Einfaches Deployment • JavaScript ist einfach • Dynamisch typisiert • Nicht geeignet für CPU-Aufwändige Aufgaben • Events und Callbacks führen zu komplizierten Strukturen (Callback Hell) Contra:Pro:
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- 86. @dkhan If all you have is a hammer, everything looks like a nail Abraham Maslow, 1966
- 87. @dkhan Thank You! | Daniel Khan | @dkhan | daniel.khan@dynatrace.com
Editor's Notes
- #16: Automatic Browser Injection for UEM Eliminate guesswork across the lifecycle No averages 100% all Transactions Low maintenance Private and Public cloud environments
- #19: Server-side JavaScript Built on Google V8 Evented non-blocking IO 8.000 Lines of C/C++ Code, 2.000 Lines of JavaScript
- #38: Those are NOT startups. Those are big brands. This is unique.
- #59: Node.js has not invented parallel asynchronous programming – it just provides a simple way to do it
- #62: Node Standard Library: JavaScript functions Node Bindings: c++ functions that bind to the underlying system (Native part) V8 (Google) Thread Pool and Event Loop – we will talk about that later
- #63: What V8 does: It translates JavaScript into machine code and runs it.
- #66: Show blocking times Problems: 1 thread per request If number of app threads is exhausted -> waiting Blocking time on app threads Context switches of threads
- #67: Show blocking times Problems: 1 thread per request If number of app threads is exhausted -> waiting Blocking time on app threads Context switches of threads