NEMOLightweight Mobile Agent Technology

Outline Mobile Agents

What are they ? Advantages and Applications

NEMO Architecture Details

Demo: Mobile ePlazza Demo: Virtual NEMO

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

Visualization Example

Advantages & Applications Advantages

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

ApplicationsService availability, discovery, monitoringInformation retrievalNetwork management, securityDynamic software deployment

NEMO Agent Language

Variables (Agent, Node)MovementForking

ConditionalsFunction callsSystem calls

General ArchitectureApplications

Network

N E M O

Abstract Network

static

Environment

N

N

Heterogeneous Environment

valentia

ePlazza

Printer

Nharo

ePlazza

bridge LAN

bridge BT

Niuli

ePlazza

TailFrontal Variables

User Application Threads

Interpreter

Detailed Architecture

Incoming Wave QueueIncoming

Wave QueueIncoming

Wave Queue

Communication Thread

Abstract Net Communicator

Bluetooth Communicator LAN Communicator

Sectors Visitor

Rules Visitor

Executor

Network

System Call Dispatcher

System Call Handler

Parser Heart Thread

Wave (Agent)

Nodal Variables

Head .

DEMO: mobile ePlazza

match ! match !

1. Profile Matching

Dari

Age: 22

Search: 31-35

Rad

Age: 34

Search: 20-25

Loba

Age: 33

Search: 20-25, 36-40

DEMO: mobile ePlazza2. Multi-user Chat

Visualization /

Development

Virtual NEMO

N

Virtual Net Communicator

console

N

console

N

console

N

console

Host iuli

chat chat

Host finite Host vasi Host n55

Virtual Host Switch

DEMO: Virtual NEMO1. Chat

2. Resource Discovery

Questions

Language example:Search for printer and return

// VARIABLE INIT

Ntemp3292=0000. // holds prev node on path, this is baseFp=C. // holds name of node prior to jump

// PROCEDURES

// pass check - pass only once by each node, record pathFpcheck = `

Ntemp3292 == Nonexistent. Ntemp3292 = Fp. Fp=C. '.

// Printer checkFgo=`

IF( Nprinter==Nonexistent, ^Fbranchout, // if no known printer then look onward

FprinterData=NprinterData. ^Fhopback.). '. // we are path to printer, take data back to sender // branch outward and find printerFbranchout=`

link#. ^Fpcheck. ^Fgo. '. // recprintinfo - as wave passes hosts on the way back, it stores print infoFrecprintinfo = `

(Nprinter/=Nonexistent. T=rknown. ), // already know about printer, stop. (Nprinter==Nonexistent. Nprinter=Fp. NprinterData=FprinterData. ^Fhopback). // store way to printer & data in node'.

// hop back - either stop or hop back and record pathFhopback = `

(Ntemp3292 == 0000. x?print_scanreturned), (Ntemp3292 /= 0000. T=hoppingback. Fp=C. link#Ntemp3292. ^Frecprintinfo. )'.

// LAUNCH

^Fgo.