1. Mobile Agent Systems

2. Mobility

3. Mobile Agents A Mobile Agent is a software agent that exists in a software Environment and can migrate from machine to machine in a heterogeneous network. Characteristics: –Agency –Autonomy –Intelligence –Mobility

4. Mobile Agents (What?)

5. Mobile Agent Model (How?) Agent Model Life-cycle Model Computational Model Security Model Communication Model Navigation Model

6. Why? Reduce the network load Overcome network latency Encapsulate protocols Execute asynchronously & autonomously Adapt dynamically Naturally heterogeneous Robust and Fault-tolerance

7. Challenges Security Transactional Management Communication costs Where and when to move agents? How do mobile agents collaborate? Control Structures

8. Jini An OO middleware for network-centric computing Enables plugging together the distributed system components into a federation. Provides users access to resources located anywhere on the network

9. Jini

10. Jini Architecture Client Service Lookup Service

11. Jini Process New services joining the network –A service must register at LookupService by using the Discovery and Join protocol Locating the service –Client locates the service through LookupService and get a proxy object Interacting with services –Client interacts with the service by its proxy

12. Example

13. LookupService Join LookupServvice ServiceImpl si = new ServiceImpl(); LookupDiscoveryManager mgr = new LookupDiscoveryManager(groups, null, null); JoinManager m = new JoinManager (si, null, si, mgr, null); ServiceFinder ServiceFinder sf = new ServiceFinder(Service.class); Service ser = (Service) sf.getObject();