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Mobile Agents

Mobile Agents. In Distributed Systems. Luk Stoops VUB - programming laboratory. What is a Software Agent User View. An agent is a program that assists people and act on their behalf Agents function by allowing people to delegate work to them. What is a Software Agent System View.

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Mobile Agents

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  1. Mobile Agents In Distributed Systems Luk Stoops VUB - programming laboratory

  2. What is a Software AgentUser View • An agent is a program that assists people and act on their behalf • Agents function by allowing people to delegate work to them

  3. What is a Software AgentSystem View • Software object situated in an execution environment • mandatory properties • Reactive • Autonomous (control over its own actions) • Goal driven (pro-active) • Temporally continuous

  4. What is a Software AgentSystem View • Possible properties • Communicative • can communicate with other agents • Mobile • can travel from one host to an other • Learning • adapts in accordance with previous experience • Believable • appears believable to the end-user

  5. Stationary Agent • Executes only on the system where it begins execution • Gets information from other resources via • Remote Procedure Call • Object Request Broker (CORBA)

  6. Mobile Agent • Not bound to the system where it begins execution • Ability to transport itself form one system to another • Ability to travel allows him to move to a system that contains an object with which the agent wants to interact

  7. Reduce the Network Load

  8. Example Aglets

  9. Finger

  10. Overcome Network Latency • Critical real-time systems • robots in manufacturing processes • Agents dispatched from central controller • Act locally

  11. Encapsulate Protocols • Protocols that implement the input /output conversions are hard-coded in the host • As protocols evolve (security, efficiency) they become a legacy problem • Mobile Agents can move to remote hosts in order to establish “channels” based on proprietary protocols

  12. Execute Asynchronously and Autonomously

  13. x y u v (x+y) * (u+v) Adapt Dynamically • Sense their execution environment and react autonomously to changes • Multiple mobile agents can distribute themselves among the hosts to form the optimal configuration for solving a particular problem

  14. Naturally Heterogeneous • Network computing is fundamentally heterogeneous • hardware • software • Mobile agents are computer- and transport layer independent • Optimal conditions for seamless system integration

  15. Robust and Fault-tolerant • Able to react dynamically to unfavorable situations and events • If a host is being shut down, all agents executing on that machine will be warned and give time to dispatch and continue their operation on another host in the network

  16. Applications • Electronic commerce • agent to agent negotiation • Personal Assistance • schedule a meeting • Secure brokering • involved parties are invited on a secure host • Distributed information retrieval • search engine to remote sources

  17. Applications • Telecommunication networks services • dynamic network reconfiguration • Workflow applications and groupware • Monitoring and notification • Information dissemination • internet “push” model • Parallel processing • mobile agent can clone themselves

  18. Literature • http://www.acm.org/~danny • http://www.trl.ibm.co.jp/aglets • http://www.meitca.com/hsl/projects/concordia • http://www.objectspace.com/voyager • http://www.cs.dartmouth.edu/~agent • http://www.uni-kl.de/ag-nehmer/ara • http://www.cs.uit.no/dos/tacoma

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