1. The SPOSAD Architectural Style
for Multi-tenant Software Applications
Heiko Koziolek
Industrial Software Systems
ABB Corporate Research
1

2. Source: salesforce.com
2

3. 28.04.2008:
„SAPs new SME software
‚Business By Design‘ jammed“
25.10.2008:
„SAP will part with
outsourcing partner“
19.02.2009:
„SAP denies sales stop
for ‚Business by Design‘“
Source: heise.de
3

4. Single-Tenancy Multi-Tenancy
Tenant1 Tenant2 Tenant3 Tenant1 Tenant2 Tenant3
App App App App
Database Database Database Database
OS OS OS OS
Hardware Hardware Hardware Hardware
4

5. Challenges
Lack of Ad-hoc Technology
Documentation Solutions Focus
5

6. Architectural Styles
An architectural /style is a coordinated set of
 Client Server  Blackboard
architectural constraints that restricts
 Pipe-and-Filter  C2
the roles / features of architectural elements
and the  Peer-to-Peer
allowed relationshipsREST (WWW)
 among those elements
within any architecture that conforms to that style.
 Mobile Code  SPIAR (AJAX) [Fielding2000]
Idea: Multi-tenancy Style
6

7. Resource Sharing Elasticity
Architectural
Architectural
Properties
Properties
Maintainability Customizability
7

8. SPOSAD Style for Multi-Tenancy
 Shared
 Polymorphic
 Scalable
 Application and
 Data

9. SPOSAD Style for Multi-Tenancy
Client Tier Application Tier Data Tier
Application Multi-tenant
Browser Cache (optional)
Load Balancer
Threads Database
REST
Asynch,
Customization Synch Data
REST Transfer
Meta-Data Meta-Data
Rich Client
Manager
9

10. SPOSAD Style for Multi-Tenancy
Client Tier Application Tier Data Tier
Elasticity Maintainability
Application Multi-tenant
Browser Cache (optional)
Load Balancer
Threads Database
REST
Asynch,
Customization Synch Data
REST Transfer
Meta-Data Meta-Data
Rich Client
Manager
Customizability Resource Sharing 10

11. Multi-tenant Database
Private Table Layout Extension Table Layout Universal Table Layout
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12. Multi-tenant Database
Private Table Layout Extension Table Layout Universal Table Layout
Account27
AID Name Robot Speed Account33
1 ABC X 20 AID Name
2 DEF Y 50 1 GHI
Account46
AID Name Lines
1 JKM 12
12

13. Multi-tenant Database
Private Table Layout Extension Table Layout Universal Table Layout
Industrial-Account
Tenant ID Row Robot Speed
Account-Extension
27 0 X 20
Tenant ID Row AID Name
27 1 Y 50
27 0 1 ABC
27 1 2 DEF Telecommunication-Account
33 0 1 GHI Tenant ID Row Lines
46 0 1 JKM 46 0 12
13

14. Multi-tenant Database
Private Table Layout Extension Table Layout Universal Table Layout
Universal
Tenant ID Table Col1 Col2 Col3 Col4 Col5 Col6
27 0 1 ABC X 20 - -
27 0 2 DEF Y 50 - -
33 1 1 GHI - - - -
46 2 1 JKM 12 - - -
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15. Shared
Single Code Base
Architectural
Architectural Data Resources
Constraints
Properties
STATE
Customization Component Stateless Application Tier
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16. Architectural Trade-offs
Resource Sharing
vs. Security / Availability
Complexity
vs. Time to market
Customizability
vs. Maintainability
16

17. Evaluation?
17

18. Client Tier Application Tier Data Tier
Virtual Application Customized
Components Oracle RAC
Application Multi-tenant
Browser Cache (optional)
Load Balancer
Threads Database
REST
Asynch,
Customization Synch Data
REST Transfer
Meta-Data Meta-Data
Rich Client
Manager
Universal Table
Runtime Engine
Layout
18

19. Client Tier Application Tier Data Tier
Web / Worker Blobs, Tables,
Roles SQL Azure
Application Multi-tenant
Browser Cache (optional)
Load Balancer
Threads Database
REST
Asynch,
Customization Synch Data
REST Transfer
Meta-Data Meta-Data
Rich Client
Manager
Worker Role
19

20. Client Tier Application Tier Data Tier
JSP / Servlet,
Google Big Table
Python
Application Multi-tenant
Browser Cache (optional)
Load Balancer
Threads Database
REST
Asynch,
Customization Synch Data
REST Transfer
Meta-Data Meta-Data
Rich Client
Manager
App Engine
Services
20

21. …and SAP? ?
27.01.2010
„With feature pack 2.5,
appearing in summer this year,
Business ByDesign
gets a multi-tenant architecture“
Peter Lorenz
Chief SME Solutions SAP
Source: isreport.de
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22. Conclusions
Multi-tenancy as an Architectural Style
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