Osservazioni sul funzionamento di DataSnap.

1. DATASNAP

2. DATASNAP
• Formerly MIDAS.
• Rimossa la fondazione DCOM (sconsigliata da Microsoft)
• Sostituita con i Component Indy.
• Si basa su dbExpress.

3. LIMITI
• Autenticazione e autorizzazione in Delphi XE3, solo HTTP
Basic.
• Indy crea un thread per connessione.
• Framework di remoting costruito sopra un framework SQL.

4. LIMITI
Remoting Framework
SQL Framework

5. LIMITI
SQL Framework
Remoting Framework

6. TEST
http://192.168.10.14:8090/datasnap/rest/
TServerMethods/EchoString/A%20B%20C

7. TEST - 1 THREAD

8. TEST - 1 THREAD

9. TEST - 10 THREAD

10. LATENZA
30
22,5
15
22
DataSnap 1 thread
7,5 14 14 DataSnap 10 thread
BBox 1 thread
0 2 3
BBox 200 thread
Node.js 200 thread

11. THROUGHPUT
7000
6.196
5250
3500
5.340
1750 DataSnap 1 thread
DataSnap 10 thread
BBox 1 thread
BBox 200 thread
0 63 45 360 Node.js 200 thread

12. MARCO CANTÙ
DELPHI PRODUCT MANAGER
I think that if you want to build a very large REST
application architecture you should roll out your own
technology or use one of these prototypical
architectures. For a small to medium size effort, on the
other hand, you can probably benefit from the native
DataSnap support.
Delphi 2010 Handbook

13. FONTI
• http://en.wikipedia.org/wiki/DataSnap
• http://www.sandon.it/?q=node/57
• http://robertocschneiders.wordpress.com/2012/11/22/
datasnap-analysis-based-on-speed-stability-test

14. TROVIAMO UN'ALTERNATIVA!
• mORMot: client-server ORM and SOA for Delphi
• Java con Apache CXF e librerie native
• Node.js con librerie native