1. Distributed Systems Seminars
Adapter-Logic Application:
a JGroups based integration framework
for heterogeneous environments
Flavio Bertini

2. Roadmap
1) Introduction to group communication
2) Group communication issues
3) The JGroups solution
4) A case study: Adapter-Logic Application
✔ Why introduce an adapter?
✔ How A.L.A. works
✔ Operational modes
✔ The clustering subsystem
✔ How JGroups helped A.L.A.
5) Other application areas of JGroups
2

3. Group communication
Every Distributed Systems need to communicate
through a reliable layer.
All nodes cooperating for a unique target may
have the necessity to rely on a complex
communication architecture to merge/compare
data (e.g. SETI@home, Clustering, etc.) 3

4. Group Communication issues
The most common problems in group
communication are:
✔ Keep consistence between replicas
✔ Prevent data corruptions
✔ Ensure a message is delivered to recipients
✔ many more...
4

5. Group Communication issues
The most common problems in group
communication are:
✔ Keep consistence between replicas
✔ Prevent data corruptions
✔ Ensure a message is delivered to recipients
✔ many more...
5

6. Group Communication issues
The most common problems in group
communication are:
✔ Keep consistence between replicas
✔ Prevent data corruptions
✔ Ensure a message is delivered to recipients
✔ many more...
6

7. The JGroups solution
JGroups is a multi platform toolkit for a reliable
group communication
7

8. The JGroups solution
JGroups is a multi platform toolkit for a reliable
group communication
8

9. A case study:
Adapter-Logic Application
A.L.A. is:
✔ a JGroups success story
✔ an integration framework (adapter) for
heterogeneous environments and architectures.
✔ a solution to integrate legacy systems in SOA
flows
9

10. A case study:
Adapter-Logic Application
A.L.A. is:
✔ a JGroups success story
✔ an integration framework (adapter) for
heterogeneous environments and architectures.
✔ a solution to integrate legacy systems in SOA
flows
Only one platform to manage several
architectures!
10

11. Why introduce an adapter?
Overcome the barriers due to the lack of a common
language between heterogeneous systems
11

12. How A.L.A. works
A.L.A. works through a very scalable plugins
system called Controllers and Connectors
12

13. How A.L.A. works
A.L.A. works through a very scalable plugins
system called Controllers and Connectors
13

14. A.L.A. operational modes
Two operational modes:
✔ Active/Active
hot standby sparing: two or more A.L.A.
instances run in parallel.
→ High Availability and Load Balancing
✔ Active/Passive
cold standby sparing: two or more A.L.A.
instances but only one is running.
14

15. High Availability and Load Balancing
Active/Active:
15

16. High Availability only
Active/Passive:
16

17. The Clustering subsystem (internals)
A single point of failure 17

18. The Clustering subsystem (internals)
The fault tolerant adapter model 18

19. The Activation Queue
19

20. The Activation Queue
20

21. The Activation Queue
The Activation Queue is reorganized 21

22. How JGroups helped A.L.A.
The Cluster events propagate through the 22
Network thanks to the JGroups API

23. Another JGroups utilization example
JBoss Clustering modular stack 23

24. All A.L.A. related images are property of Sunnyvale. I wish to thank Denis Maggiorotto, 24
who is the CEO and founder. All rights reserved.