Clean source

build.xml

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+<project name="JadeLab2" default="run" basedir=".">
+  <property name="src" location="src"/>
+  <property name="build" location="build"/>
+
+  <target name="init">
+    <mkdir dir="${build}"/>
+  </target>
+
+  <target name="compile" depends="init" description="compile the source " >
+    <javac srcdir="${src}" destdir="${build}">
+      <classpath location="jade/lib/jade.jar" />
+    </javac>
+  </target>
+
+  <target name="clean" description="clean up" >
+    <delete dir="${build}"/>
+    <delete dir="${dist}"/>
+  </target>
+
+  <target name="run" description="create agents" >
+    <java fork="true" classpath="jade/lib/jade.jar;build" classname="jade.Boot">
+      <arg value="-gui" />
+      <arg value="buyer:jadelab2.BookBuyerAgent(10000);seller1:jadelab2.BookSellerAgent;seller2:jadelab2.BookSellerAgent" />
+    </java>
+  </target>
+</project>

src/BookBuyerAgent.java

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+package jadelab2;
+
+import jade.core.Agent;
+import jade.core.AID;
+import jade.core.behaviours.*;
+import jade.lang.acl.ACLMessage;
+import jade.lang.acl.MessageTemplate;
+import jade.domain.DFService;
+import jade.domain.FIPAException;
+import jade.domain.FIPAAgentManagement.DFAgentDescription;
+import jade.domain.FIPAAgentManagement.ServiceDescription;
+
+public class BookBuyerAgent extends Agent {
+  private BookBuyerGui myGui;
+  private String targetBookTitle;
+  
+  //list of found sellers
+  private AID[] sellerAgents;
+  
+	protected void setup() {
+	  targetBookTitle = "";
+	  System.out.println("Hello! " + getAID().getLocalName() + " is ready for the purchase order.");
+	  myGui = new BookBuyerGui(this);
+	  myGui.display();
+		//time interval for buyer for sending subsequent CFP
+		//as a CLI argument
+		int interval = 20000;
+		Object[] args = getArguments();
+		if (args != null && args.length > 0) interval = Integer.parseInt(args[0].toString());
+	  addBehaviour(new TickerBehaviour(this, interval)
+	  {
+		  protected void onTick()
+		  {
+			  //search only if the purchase task was ordered
+			  if (!targetBookTitle.equals(""))
+			  {
+				  System.out.println(getAID().getLocalName() + ": I'm looking for " + targetBookTitle);
+				  //update a list of known sellers (DF)
+				  DFAgentDescription template = new DFAgentDescription();
+				  ServiceDescription sd = new ServiceDescription();
+				  sd.setType("book-selling");
+				  template.addServices(sd);
+				  try
+				  {
+					  DFAgentDescription[] result = DFService.search(myAgent, template);
+					  System.out.println(getAID().getLocalName() + ": the following sellers have been found");
+					  sellerAgents = new AID[result.length];
+					  for (int i = 0; i < result.length; ++i)
+					  {
+						  sellerAgents[i] = result[i].getName();
+						  System.out.println(sellerAgents[i].getLocalName());
+					  }
+				  }
+				  catch (FIPAException fe)
+				  {
+					  fe.printStackTrace();
+				  }
+
+				  myAgent.addBehaviour(new RequestPerformer());
+			  }
+		  }
+	  });
+  }
+
+	//invoked from GUI, when purchase was ordered
+	public void lookForTitle(final String title)
+	{
+		addBehaviour(new OneShotBehaviour()
+		{
+			public void action()
+			{
+				targetBookTitle = title;
+				System.out.println(getAID().getLocalName() + ": purchase order for " + targetBookTitle + " accepted");
+			}
+		});
+	}
+
+    	protected void takeDown() {
+		myGui.dispose();
+		System.out.println("Buyer agent " + getAID().getLocalName() + " terminated.");
+	}
+  
+	private class RequestPerformer extends Behaviour {
+	  private AID bestSeller;
+	  private int bestPrice;
+	  private int repliesCnt = 0;
+	  private MessageTemplate mt;
+	  private int step = 0;
+	
+	  public void action() {
+	    switch (step) {
+	    case 0:
+	      //call for proposal (CFP) to found sellers
+	      ACLMessage cfp = new ACLMessage(ACLMessage.CFP);
+	      for (int i = 0; i < sellerAgents.length; ++i) {
+	        cfp.addReceiver(sellerAgents[i]);
+	      } 
+	      cfp.setContent(targetBookTitle);
+	      cfp.setConversationId("book-trade");
+	      cfp.setReplyWith("cfp"+System.currentTimeMillis()); //unique value
+	      myAgent.send(cfp);
+	      mt = MessageTemplate.and(MessageTemplate.MatchConversationId("book-trade"),
+	                               MessageTemplate.MatchInReplyTo(cfp.getReplyWith()));
+	      step = 1;
+	      break;
+	    case 1:
+	      //collect proposals
+	      ACLMessage reply = myAgent.receive(mt);
+	      if (reply != null) {
+	        if (reply.getPerformative() == ACLMessage.PROPOSE) {
+	          //proposal received
+	          int price = Integer.parseInt(reply.getContent());
+	          if (bestSeller == null || price < bestPrice) {
+	            //the best proposal as for now
+	            bestPrice = price;
+	            bestSeller = reply.getSender();
+	          }
+	        }
+	        repliesCnt++;
+	        if (repliesCnt >= sellerAgents.length) {
+	          //all proposals have been received
+	          step = 2; 
+	        }
+	      }
+	      else {
+	        block();
+	      }
+	      break;
+	    case 2:
+	      //best proposal consumption - purchase
+	      ACLMessage order = new ACLMessage(ACLMessage.ACCEPT_PROPOSAL);
+          order.addReceiver(bestSeller);
+	      order.setContent(targetBookTitle);
+	      order.setConversationId("book-trade");
+	      order.setReplyWith("order"+System.currentTimeMillis());
+	      myAgent.send(order);
+	      mt = MessageTemplate.and(MessageTemplate.MatchConversationId("book-trade"),
+	                               MessageTemplate.MatchInReplyTo(order.getReplyWith()));
+	      step = 3;
+	      break;
+	    case 3:      
+	      //seller confirms the transaction
+	      reply = myAgent.receive(mt);
+	      if (reply != null) {
+	        if (reply.getPerformative() == ACLMessage.INFORM) {
+	          //purchase succeeded
+	          System.out.println(getAID().getLocalName() + ": " + targetBookTitle + " purchased for " + bestPrice + " from " + reply.getSender().getLocalName());
+		  System.out.println(getAID().getLocalName() + ": waiting for the next purchase order.");
+		  targetBookTitle = "";
+	          //myAgent.doDelete();
+	        }
+	        else {
+	          System.out.println(getAID().getLocalName() + ": purchase has failed. " + targetBookTitle + " was sold in the meantime.");
+	        }
+	        step = 4;	//this state ends the purchase process
+	      }
+	      else {
+	        block();
+	      }
+	      break;
+	    }        
+	  }
+	
+	  public boolean done() {
+	  	if (step == 2 && bestSeller == null) {
+	  		System.out.println(getAID().getLocalName() + ": " + targetBookTitle + " is not on sale.");
+	  	}
+	    //process terminates here if purchase has failed (title not on sale) or book was successfully bought 
+	    return ((step == 2 && bestSeller == null) || step == 4);
+	  }
+	}
+
+}

src/BookBuyerGui.java

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+package jadelab2;
+
+import jade.core.AID;
+
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+class BookBuyerGui extends JFrame {	
+	private BookBuyerAgent myAgent;
+	
+	private JTextField titleField;
+	
+	BookBuyerGui(BookBuyerAgent a) {
+		super(a.getLocalName());
+		
+		myAgent = a;
+		
+		JPanel p = new JPanel();
+		p.setLayout(new GridLayout(2, 2));
+		p.add(new JLabel("Title:"));
+		titleField = new JTextField(15);
+		p.add(titleField);
+		getContentPane().add(p, BorderLayout.CENTER);
+		
+		JButton addButton = new JButton("Search");
+		addButton.addActionListener( new ActionListener() {
+			public void actionPerformed(ActionEvent ev) {
+				try {
+					String title = titleField.getText().trim();
+					myAgent.lookForTitle(title);
+					titleField.setText("");
+				}
+				catch (Exception e) {
+					JOptionPane.showMessageDialog(BookBuyerGui.this, "Invalid values. " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE); 
+				}
+			}
+		} );
+		p = new JPanel();
+		p.add(addButton);
+		getContentPane().add(p, BorderLayout.SOUTH);
+		
+		addWindowListener(new	WindowAdapter() {
+			public void windowClosing(WindowEvent e) {
+				myAgent.doDelete();
+			}
+		} );
+		
+		setResizable(false);
+	}
+	
+	public void display() {
+		pack();
+		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+		int centerX = (int)screenSize.getWidth() / 2;
+		int centerY = (int)screenSize.getHeight() / 2;
+		setLocation(centerX - getWidth() / 2, centerY - getHeight() / 2);
+		setVisible(true);
+	}	
+}

src/BookSellerAgent.java

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+package jadelab2;
+
+import jade.core.Agent;
+import jade.core.behaviours.*;
+import jade.lang.acl.ACLMessage;
+import jade.lang.acl.MessageTemplate;
+import jade.domain.DFService;
+import jade.domain.FIPAException;
+import jade.domain.FIPAAgentManagement.DFAgentDescription;
+import jade.domain.FIPAAgentManagement.ServiceDescription;
+
+import java.util.*;
+
+public class BookSellerAgent extends Agent {
+  private Hashtable catalogue;
+  private BookSellerGui myGui;
+
+  protected void setup() {
+    catalogue = new Hashtable();
+    myGui = new BookSellerGui(this);
+    myGui.display();
+
+    //book selling service registration at DF
+    DFAgentDescription dfd = new DFAgentDescription();
+    dfd.setName(getAID());
+    ServiceDescription sd = new ServiceDescription();
+    sd.setType("book-selling");
+    sd.setName("JADE-book-trading");
+    dfd.addServices(sd);
+    try {
+      DFService.register(this, dfd);
+    }
+    catch (FIPAException fe) {
+      fe.printStackTrace();
+    }
+    
+    addBehaviour(new OfferRequestsServer());
+
+    addBehaviour(new PurchaseOrdersServer());
+  }
+
+  protected void takeDown() {
+    //book selling service deregistration at DF
+    try {
+      DFService.deregister(this);
+    }
+    catch (FIPAException fe) {
+      fe.printStackTrace();
+    }
+  	myGui.dispose();
+    System.out.println("Seller agent " + getAID().getName() + " terminated.");
+  }
+
+  //invoked from GUI, when a new book is added to the catalogue
+  public void updateCatalogue(final String title, final int price) {
+    addBehaviour(new OneShotBehaviour() {
+      public void action() {
+		catalogue.put(title, new Integer(price));
+		System.out.println(getAID().getLocalName() + ": " + title + " put into the catalogue. Price = " + price);
+      }
+    } );
+  }
+  
+	private class OfferRequestsServer extends CyclicBehaviour {
+	  public void action() {
+	    //proposals only template
+		MessageTemplate mt = MessageTemplate.MatchPerformative(ACLMessage.CFP);
+		ACLMessage msg = myAgent.receive(mt);
+	    if (msg != null) {
+	      String title = msg.getContent();
+	      ACLMessage reply = msg.createReply();
+	      Integer price = (Integer) catalogue.get(title);
+	      if (price != null) {
+	        //title found in the catalogue, respond with its price as a proposal
+	        reply.setPerformative(ACLMessage.PROPOSE);
+	        reply.setContent(String.valueOf(price.intValue()));
+	      }
+	      else {
+	        //title not found in the catalogue
+	        reply.setPerformative(ACLMessage.REFUSE);
+	        reply.setContent("not-available");
+	      }
+	      myAgent.send(reply);
+	    }
+	    else {
+	      block();
+	    }
+	  }
+	}
+
+	
+	private class PurchaseOrdersServer extends CyclicBehaviour {
+	  public void action() {
+	    //purchase order as proposal acceptance only template
+		MessageTemplate mt = MessageTemplate.MatchPerformative(ACLMessage.ACCEPT_PROPOSAL);
+		ACLMessage msg = myAgent.receive(mt);
+	    if (msg != null) {
+	      String title = msg.getContent();
+	      ACLMessage reply = msg.createReply();
+	      Integer price = (Integer) catalogue.remove(title);
+	      if (price != null) {
+	        reply.setPerformative(ACLMessage.INFORM);
+	        System.out.println(getAID().getLocalName() + ": " + title + " sold to " + msg.getSender().getLocalName());
+	      }
+	      else {
+	        //title not found in the catalogue, sold to another agent in the meantime (after proposal submission)
+	        reply.setPerformative(ACLMessage.FAILURE);
+	        reply.setContent("not-available");
+	      }
+	      myAgent.send(reply);
+	    }
+	    else {
+		  block();
+		}
+	  }
+	}
+
+}

src/BookSellerGui.java

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+package jadelab2;
+
+import jade.core.AID;
+
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+class BookSellerGui extends JFrame {	
+	private BookSellerAgent myAgent;
+	
+	private JTextField titleField, priceField;
+	
+	BookSellerGui(BookSellerAgent a) {
+		super(a.getLocalName());
+		
+		myAgent = a;
+		
+		JPanel p = new JPanel();
+		p.setLayout(new GridLayout(2, 2));
+		p.add(new JLabel("Title:"));
+		titleField = new JTextField(15);
+		p.add(titleField);
+		p.add(new JLabel("Price:"));
+		priceField = new JTextField(15);
+		p.add(priceField);
+		getContentPane().add(p, BorderLayout.CENTER);
+		
+		JButton addButton = new JButton("Add");
+		addButton.addActionListener( new ActionListener() {
+			public void actionPerformed(ActionEvent ev) {
+				try {
+					String title = titleField.getText().trim();
+					String price = priceField.getText().trim();
+					myAgent.updateCatalogue(title, Integer.parseInt(price));
+					titleField.setText("");
+					priceField.setText("");
+				}
+				catch (Exception e) {
+					JOptionPane.showMessageDialog(BookSellerGui.this, "Invalid values. " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE); 
+				}
+			}
+		} );
+		p = new JPanel();
+		p.add(addButton);
+		getContentPane().add(p, BorderLayout.SOUTH);
+		
+		addWindowListener(new	WindowAdapter() {
+			public void windowClosing(WindowEvent e) {
+				myAgent.doDelete();
+			}
+		} );
+		
+		setResizable(false);
+	}
+	
+	public void display() {
+		pack();
+		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+		int centerX = (int)screenSize.getWidth() / 2;
+		int centerY = (int)screenSize.getHeight() / 2;
+		setLocation(centerX - getWidth() / 2, centerY - getHeight() / 2);
+		setVisible(true);
+	}	
+}