Post on 23-Mar-2020
Node.jsLuis Ackermann
25. November 2014
Seminar: Open-Source-Softwareentwicklung HS2014, Universität Basel
JavaScript• Dynamic type-checking
• Wert bestimmt Datentyp, nicht Variable
• Ermöglicht sehr flexibles Entwickeln
• Weakly typed
• Funktionen sind typ-ungebunden
• Objekte lassen sich dynamisch erweitern
• Truthy & Falsy Variablen
Node.js
• JavaScript Laufzeit-Umgebung
• JIT-Kompilierung mit V8
• Single-threaded, easily scalable
Node.js
“Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.”
— nodejs.org
Blocking I/O
Request Handler
Request Thread
Thread
Thread
Request Handler
Request Thread
Thread
Thread
Blocking I/O
Request Handler
Thread
Thread
ThreadRequest
Request
Blocking I/O
Request Handler
Thread
Thread
Thread
Response
Blocking I/O
Request Handler
Request Thread
Thread
Thread
Blocking I/O
Request Handler
Thread
Thread
Thread
Request
Request
🕑
🕑
Blocking I/O
Non-blocking I/O
Event Loop
Request
Request
Request
Non-blocking I/O
Event Loop IO
IO
IORequest
Request
Request
Non-blocking I/O
Event Loop IO
IO
IO
Response
Non-blocking I/O
Event Loop IO
IO
Non-blocking I/O
Event Loop IO
IO
IO
Request
Request
Non-blocking I/O
Event Loop IO
IO
IO
IO
IO
Request
Request
Non-blocking I/O
Event Loop IO
IO
IO
IO
IO
Request
Request
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
Beispiel
Danke für die Aufmerksamkeit