NEMO

1
NEMO

• Lightweight Mobile Agent Technology

2
Outline

• Mobile Agents
• What are they ?
• Advantages and Applications
• NEMO
• Architecture
• Details
• Demo Mobile ePlazza
• Demo Virtual NEMO

3
What are Mobile Agents

• Agent an entity which performs a task on behalf
  of someone
• Mobile agent program data moving between
  heterogeneous hosts performing specific tasks

4
Visualization Example
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Advantages Applications

• Advantages
• Move computation to data
• Asynchronous execution
• Dynamic adaptation, fault tolerant
• Flexible maintenance

• Applications
• Service availability, discovery, monitoring
• Information retrieval
• Network management, security
• Dynamic software deployment

6
NEMO

• Agent Language

Variables (Agent, Node) Movement Forking Conditionals Function calls System calls
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Heterogeneous Environment
ePlazza
valentia
Printer
ePlazza
haro
bridge LAN
bridge BT
ePlazza
iuli
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Detailed Architecture
User
Application Threads
System Call Handler
Interpreter
Executor
System Call Dispatcher
Sectors Visitor
Rules Visitor
Parser
Heart Thread
Wave (Agent)
Communication Thread
Network
Abstract Net Communicator
Bluetooth Communicator
LAN Communicator
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DEMO mobile ePlazza
1. Profile Matching
Dari Age 22 Search 31-35
match !
match !
Rad Age 34 Search 20-25
Loba Age 33 Search 20-25, 36-40
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DEMO mobile ePlazza
2. Multi-user Chat
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Virtual NEMO
Visualization / Development
Virtual Host Switch
Host iuli
Host finite
Host vasi
Host n55
console
console
console
console
chat
chat
Virtual Net Communicator
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DEMO Virtual NEMO
1. Chat2. Resource Discovery
13
Questions
14
Language exampleSearch for printer and return

• // VARIABLE INIT
• Ntemp32920000. // holds prev node on path,
  this is base
• FpC. // holds name of node
  prior to jump
• // PROCEDURES
• // pass check - pass only once by each node,
  record path
• Fpcheck
• Ntemp3292 Nonexistent. Ntemp3292 Fp. FpC.
  '.
• // Printer check
• Fgo
• IF( NprinterNonexistent,
• Fbranchout, // if no known printer then
  look onward
• FprinterDataNprinterData.
  Fhopback.). '. // we are path to printer, take
  data back to sender
• // branch outward and find printer
• Fbranchout