, , "" - behaviours. , jade.core.behaviours.Behaviour. () addBehaviour() Agen t. , ( setup()).
Behaviour : action() done(). action() , , . done() boolean value, , ().
. , (pre-emptive (as for Java threads)), . , , , action() . .. , . , , , :
Java ( , , , );
, Java;
( ), .. Java;
( ) ( ).
3.3.
setup(), . . , , , , . (, ) ( ). takeDown().
, , , , .. action() .
public class OverbearingBehaviour extends Behaviour {
public void action() {
while (true) {
// do something}
}
public boolean done() {
return true; } }
.
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1) (one-shot) , action () , . jade.core.behaviours.OneShotBehaviour done(), true, .
public class MyOneShotBehaviour extends OneShotBehaviour {
public void action() {
// perform operation X
}}
.
2) (yclic) , . action() , . jade.core.behaviours.CyclicBehaviour done(), false, .
public class MyCyclicBehaviour extends CyclicBehaviour {
public void action() {
// perform operation Y
} }
Y , , .
3) (generic) , . , , done().
public class MyThreeStepBehaviour extends Behaviour {
private int step = 0;
public void action() {
switch (step) {
case 0:
// perform operation X
step++;
break;
case 1:
// perform operation Y
step++;
break;
case 2:
// perform operation Z
step++;
break;
}
public boolean done() {
return step == 3;
}}
X, Y Z , .
JADE , .
JADE ( jade.core.behaviours), , .
1) WakerBehaviour, action() done() , handleElapsedTimeout() ( ). handleElapsedTimeout() .
public class MyAgent extends Agent {
protected void setup() {
System.out.println(Adding waker behaviour);
addBehaviour(new WakerBehaviour(this, 10000) {
protected void handleElapsedTimeout() {
// perform operation X
}
});
}
X 10 Adding waker behaviour.
2) TickerBehaviour, action() done() , onTick() , ( ). TickerBehaviour .
public class MyAgent extends Agent {
protected void setup() {
addBehaviour(new TickerBehaviour(this, 10000) {
protected void onTick() {
// perform operation Y
}
});
}
Y 10 .
3.6.
, Book-buyer Book-seller .
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3.6.1. Book-buyer
Book-buyer , . , TickerBehaviour , , -. setup() BookBuyerAgent .
protected void setup() {
// Printout a welcome message
System.out.println(Hello! Buyer-agent +getAID().getName()+ is ready.);
// Get the title of the book to buy as a start-up argument
Object[] args = getArguments();
if (args!= null && args.length > 0) {//
targetBookTitle = (String) args[0];
System.out.println(Trying to buy +targetBookTitle);
// TickerBehaviour,
addBehaviour(new TickerBehaviour(this, 60000) {
protected void onTick() {
myAgent. addBehaviour(new RequestPerformer());
}
});
}
else {
// Make the agent terminate
System.out.println(No target book title specified);
doDelete();
}
myAgent: () , . RequestPerformer, -, й3 - , .
3.6.2. Book-seller
Book-seller . :
(OfferRequestsServer).
(PurchaseOrdersServer).
.
.
Book-seller : , .
, Book-seller , , , GUI. BookSellerAgent ( OfferRequestsServer PurchaseOrdersServer й3 ).
import jade.core.Agent;
import jade.core.behaviours.*;
import java.util.*;
public class BookSellerAgent extends Agent {
// The catalogue of books for sale (maps the title of a book to its price)
private Hashtable catalogue;
// The GUI by means of which the user can add books in the catalogue
private BookSellerGui myGui;
protected void setup()
{
// Create the catalogue
catalogue = new Hashtable();
// Create and show the GUI
myGui = new BookSellerGui(this);
myGui.show();
// Add the behaviour serving requests for offer from buyer agents
addBehaviour(new OfferRequestsServer());
// Add the behaviour serving purchase orders from buyer agents
addBehaviour(new PurchaseOrdersServer());
}
protected void takeDown() {
myGui.dispose();
System.out.println(Seller-agent +getAID().getName()+ terminating.);
}
/**
This is invoked by the GUI when the user adds a new book for sale
*/
public void updateCatalogue(final String title, final int price) {
addBehaviour(new OneShotBehaviour() {
public void action() {
catalogue.put(title, new Integer(price));
}
});
}
:
1. (, bookTrading), 3- : BookSellerAgent, BookByerAgent, BookSellerGui JADE\src\examples\bookTrading.
2. , : -gui agents seller:< >.BookSellerAgent; byer:< >.BookBuyerAgent1(Java_programming)
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3. -:
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4. - . , ,
Arguments:
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3. .
3. .
: BookTrading - - .
