/*
* Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
*
* The Sun Project JXTA(TM) Software License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by Sun Microsystems, Inc. for JXTA(TM) technology."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
* not be used to endorse or promote products derived from this software
* without prior written permission. For written permission, please contact
* Project JXTA at http://www.jxta.org.
*
* 5. Products derived from this software may not be called "JXTA", nor may
* "JXTA" appear in their name, without prior written permission of Sun.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SUN
* MICROSYSTEMS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* States and other countries.
*
* Please see the license information page at :
* <http://www.jxta.org/project/www/license.html> for instructions on use of
* the license in source files.
*
* ====================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of Project JXTA. For more information on Project JXTA, please see
* http://www.jxta.org.
*
* This license is based on the BSD license adopted by the Apache Foundation.
*/
/**
* ServiceClient Application: This is the client side of the EX1 example that
* looks for the JXTA-EX1 service and connects to its advertised pipe. The
* Service advertisement is published in the NetPeerGroup
* by the server application. The client discovers the service
* advertisement and create an output pipe to connect to the service input
* pipe. The server application creates an input pipe that waits to receive
* messages. Each message receive is displayed to the screen. The client
* sends an hello message.
*/
package tutorial.service;
import net.jxta.discovery.DiscoveryService;
import net.jxta.document.MimeMediaType;
import net.jxta.document.StructuredTextDocument;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.StringMessageElement;
import net.jxta.peergroup.PeerGroup;
import net.jxta.pipe.OutputPipe;
import net.jxta.pipe.PipeService;
import net.jxta.protocol.ModuleSpecAdvertisement;
import net.jxta.protocol.PeerGroupAdvertisement;
import net.jxta.protocol.PipeAdvertisement;
import net.jxta.platform.NetworkManager;
import java.io.IOException;
import java.io.StringWriter;
import java.io.File;
import java.util.Enumeration;
/**
* ServiceClient Side: This is the client side of the JXTA-EX1
* application. The client application is a simple example on how to
* start a client, connect to a JXTA enabled service, and invoke the
* service via a pipe advertised by the service. The
* client searches for the module specification advertisement
* associated with the service, extracts the pipe information to
* connect to the service, creates a new output to connect to the
* service and sends a message to the service.
* The client just sends a string to the service no response
* is expected from the service.
*/
public class ServiceClient {
static PeerGroup netPeerGroup = null;
static PeerGroupAdvertisement groupAdvertisement = null;
private DiscoveryService discovery;
private PipeService pipeService;
private NetworkManager manager;
public static void main(String args[]) {
ServiceClient myapp = new ServiceClient();
System.out.println("Starting ServiceClient peer ....");
myapp.startJxta();
System.out.println("Good Bye ....");
System.exit(0);
}
private void startJxta() {
try {
manager = new NetworkManager(NetworkManager.ConfigMode.ADHOC, "ServiceClient",
new File(new File(".cache"), "ServiceClient").toURI());
manager.startNetwork();
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
netPeerGroup = manager.getNetPeerGroup();
// this is how to obtain the netPeerGroup advertisement
groupAdvertisement = netPeerGroup.getPeerGroupAdvertisement();
// get the discovery, and pipe service
System.out.println("Getting DiscoveryService");
discovery = netPeerGroup.getDiscoveryService();
System.out.println("Getting PipeService");
pipeService = netPeerGroup.getPipeService();
startClient();
}
// start the client
private void startClient() {
// Let's initialize the client
System.out.println("Start the ServiceClient");
// Let's try to locate the service advertisement we will loop until we find it!
System.out.println("searching for the JXTA-EX1 Service advertisement");
Enumeration en;
while (true) {
try {
// let's look first in our local cache to see if we have it! We try to discover an adverisement
// which as the (Name, JXTA-EX1) tag value
en = discovery.getLocalAdvertisements(DiscoveryService.ADV, "Name", "JXTASPEC:JXTA-EX1");
// Ok we got something in our local cache does not need to go further!
if ((en != null) && en.hasMoreElements()) {
break;
}
// We could not find anything in our local cache, so let's send a
// remote discovery request searching for the service advertisement.
discovery.getRemoteAdvertisements(null, DiscoveryService.ADV, "Name", "JXTASPEC:JXTA-EX1", 1, null);
// The discovery is asynchronous as we do not know how long is going to take
try {
// sleep as much as we want. Yes we should implement asynchronous listener pipe...
Thread.sleep(2000);
} catch (Exception e) {
// ignored
}
} catch (IOException e) {
// found nothing! move on
}
System.out.print(".");
}
System.out.println("we found the service advertisement");
// Ok get the service advertisement as a Spec Advertisement
ModuleSpecAdvertisement mdsadv = (ModuleSpecAdvertisement) en.nextElement();
try {
// let's print the advertisement as a plain text document
StructuredTextDocument doc = (StructuredTextDocument) mdsadv.getDocument(MimeMediaType.TEXT_DEFAULTENCODING);
StringWriter out = new StringWriter();
doc.sendToWriter(out);
System.out.println(out.toString());
out.close();
// we can find the pipe to connect to the service
// in the advertisement.
PipeAdvertisement pipeadv = mdsadv.getPipeAdvertisement();
// Ok we have our pipe advertiseemnt to talk to the service
// create the output pipe endpoint to connect
// to the server, try 3 times to bind the pipe endpoint to
// the listening endpoint pipe of the service
OutputPipe outputPipe = pipeService.createOutputPipe(pipeadv, 10000);
// create the data string to send to the server
String data = "Hello my friend!";
// create the pipe message
Message msg = new Message();
StringMessageElement sme = new StringMessageElement("DataTag", data, null);
msg.addMessageElement(null, sme);
// send the message to the service pipe
outputPipe.send(msg);
System.out.println("message \"" + data + "\" sent to the ServiceServer");
} catch (Exception ex) {
ex.printStackTrace();
System.out.println("ServiceClient: Error sending message to the service");
}
}
}