// Try to find at least two RestoPeers (an arbitrary number)        // RestoPeers are found by their pipe advertisements        while (count-- >0) {            try {                // Check if we already have restaurant advertisements                // in our local peer cache                Enumeration ae =                    disco.getLocalAdvertisements(DiscoveryService.ADV,                                     "name", "RestoNet:RestoPipe:*");                // If we found some advertisements in the cache,                // add them to the list                if (ae != null && ae.hasMoreElements()) {                    // Reset count and RestoPeerAdvs as we have                    // just retrieved all advertisements, including                    // previously cached ones                    found = 0;                    restoPeerAdvs.removeAllElements();                    while (ae.hasMoreElements()) {                        restoPeerAdvs.addElement(ae.nextElement());                        ++found;                    }                    if (found > 1)                        break;     // Want to find at least two                }                // Did not find enough advertisement in the cache.                // Send a remote discovery request to search for                // more RestoPeer advertisements                disco.getRemoteAdvertisements(null,                             DiscoveryService.ADV,                             "name", "RestoNet:RestoPipe:*", 5, null);                // Give the peers a chance to respond                try {                    Thread.sleep(timeout);                } catch (InterruptedException e) {}            } catch (IOException e){                // Found nothing! Move on            }        }        // Completed RestoPeer Discovery        System.out.println("Found " + found + " RestoPeers(s)");    }    // Method to connect and open output pipes to all the    // RestoPeers that we have discovered. Each RestoPeer is    // identified by its unique RestoPeer pipe advertisement.    private void connectToRestoPeers() {        // Enumerate all the RestoPeer pipe advertisments we have discovered        // and attempt to connect a pipe which each of them        for (Enumeration en = restoPeerAdvs.elements();             en.hasMoreElements();) {            PipeAdvertisement padv = (PipeAdvertisement) en.nextElement();            try {                System.out.println(                    "Attempting to connect to discovered RestoPeer");                // Create an output pipe connection to the RestoPeer                OutputPipe pipeOut = pipes.createOutputPipe(padv,                                                            rtimeout);                // Check if we have a connected pipe                if (pipeOut == null) {                    // Failed; go to next RestoPeer                    System.out.println(                        "Failure to connect to RestoPeer Pipe:" +                        padv.getName());                    continue;                }                // Save the output pipe                restoPeerPipes.addElement(pipeOut);                System.out.println("Connected pipe to " + padv.getName());            } catch (Exception e) {                // Error during connection go to next RestoPeer                System.out.println("RestoPeer may not be there anymore:" +                                    padv.getName());                 continue;            }        }    }    // Send an auction request for French Fries to all the RestoPeer    // pipes we have successfully connected    private void sendFriesAuctionRequests() {        // Enumerate all the RestoPeer pipe connections we have successfully        // connected to        for (Enumeration en = restoPeerPipes.elements();            en.hasMoreElements();) {            OutputPipe op = (OutputPipe) en.nextElement();            try {                // Construct the request document                StructuredDocument request  =                    StructuredDocumentFactory.newStructuredDocument(mimeType,                    "RestoNet:Request");                // Fill up the Fries auction request argument                Element re;                re = request.createElement("Name", myIdentity);                request.appendChild(re);                re = request.createElement("Fries", friesRequest);                request.appendChild(re);                // Create the pipe message to send                Message msg = pipes.createMessage();                // Fill the first message element which is the HungryPeer                // pipe advertisement return address. We need this                // so RestoPeers can respond to us                msg.addElement(msg.newMessageElement("HungryPeerPipe",                         mimeType, myAdv.getDocument(mimeType).getStream()));                // Fill the second message element, which is                // the fries request. Insert the document                // in the message                msg.addElement(msg.newMessageElement("Request",                         mimeType, request.getStream()));                // Send the auction message to the RestoPeer                op.send(msg);                System.out.println("Sent Fries Auction Request ("                    + friesRequest + ") to connected peers");            } catch (Exception ex) {                // Error sending auction request                System.out.println(                    "Failed to send auction request to RestoPeer");            }        }    }    // Receive bid requests from RestoPeers on the    // HungryPeer listening pipe    private void receiveFriesBids() {        // Continue until we get all answers        while (true) {            Message msg = null;      // Pipe message received            String price = null;     // Fries price bid            String brand = null;     // RestoPeer name which offers the bid            String specials = null;  // Specials offer bid            InputStream ip = null;   // Input stream to read message element            StructuredDocument bid = null; //Bid document received            try {                // Wait for a bid message to arrive from a RestoPeer                // Will block until a message arrive                msg = myPipe.waitForMessage();                // Check if the message is valid                if (msg == null) {                    if (Thread.interrupted()) {                        // We have been asked to stop                        System.out.println(                            "Abort Receiving bid loop interrupted");                        myPipe.close(); // Close the Pipe                        return;                    }                }            } catch (Exception ex) {                // Error in receiving message                myPipe.close();                System.out.println("Abort Receiving Error receiving bids");                return;            }            // We got a message from a RestoPeer.            // Extract and display infomation about the bid received.            try {                // Extract the Bid document from the message                ip = msg.getElement("Bid").getStream();                bid = StructuredDocumentFactory.newStructuredDocument(                            mimeType, ip);                // Parse the document to extract bid information                Enumeration enum = bid.getChildren();                while (enum.hasMoreElements()) {                    Element element = (Element) enum.nextElement();                    String attr = (String) element.getKey();                    String value = (String) element.getValue();                    if (attr.equals("Price")) {                        price = value;                        continue;                    }                    if (attr.equals("Brand")) {                        brand = value;                        continue;                    }                    if (attr.equals("Specials")) {                        specials = value;                        continue;                    }                }                // We got a valid bid. Print it.                System.out.println("Received Fries Bid from RestoPeers (" +                           brand + ") at a Price ($" + price +                           ") \nRestoPeers Special (" + specials + ")");            } catch (Exception e) {                // Broken content                System.out.println("Error extracting bid from the message");                continue;            }        }    }}