Datasnap is a remoting framework that was formerly known as Midas. It has replaced the DCOM foundation with Indy components and is based on dbExpress. It allows for HTTP Basic authentication and authorization in Delphi XE3 but creates a thread per connection. It builds a remoting framework on top of a SQL framework. Testing showed that Datasnap performance decreases with increased threads while Node.js performance increases with more threads due to its asynchronous model. For small to medium projects, Datasnap may be suitable, but for large REST applications an alternative technology may need to be considered.

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