// xmlBlaster/demo/javaclients/Latency.java
package javaclients;
import java.util.logging.Logger;
import java.util.logging.Level;
import org.xmlBlaster.util.*;
import org.xmlBlaster.client.I_Callback;
import org.xmlBlaster.client.key.SubscribeKey;
import org.xmlBlaster.client.key.PublishKey;
import org.xmlBlaster.client.key.UpdateKey;
import org.xmlBlaster.client.qos.ConnectQos;
import org.xmlBlaster.client.qos.DisconnectQos;
import org.xmlBlaster.client.qos.PublishQos;
import org.xmlBlaster.client.qos.SubscribeQos;
import org.xmlBlaster.client.qos.UpdateQos;
import org.xmlBlaster.client.I_XmlBlasterAccess;
import org.xmlBlaster.util.MsgUnit;
/**
* Measure the brutto roundtrip latency of a message publish and update.
* <p />
* Invoke examples (put xmlBlaster.jar in your CLASSPATH):
* <br />
* On localhost:
* <pre>
* java org.xmlBlaster.Main
* java javaclients.Latency -numSend 100
* </pre>
* <br />
* Over the internet with CORBA:
* <pre>
* java javaclients.Latency -numSend 100 -bootstrapHostname server.xmlBlaster.org
* or if you have a dynamic IP:
* java javaclients.Latency -numSend 100 -bootstrapHostname server.xmlBlaster.org -dispatch/callback/plugin/ior/hostname <myCurrentIP>
* </pre>
* <br />
* Over the internet with XmlRpc:
* <pre>
* java javaclients.Latency -numSend 100 -dispatch/connection/protocol XMLRPC -dispatch/connection/plugin/xmlrpc/hostname server.xmlBlaster.org -dispatch/callback/plugin/xmlrpc/hostname <myCurrentIP>
* </pre>
* <p />
* Results, for one round trip including publish -> processing in xmlBlaster -> update -> parsing in client (600 MHz AMD Linux):
* <br />
* <ul>
* <li>CORBA in intranet: ~ 6 milliseconds</li>
* <li>XmlRpc in intranet: ~ 16 milliseconds</li>
* <li>CORBA over internet: ~ 105 milliseconds</li>
* <li>XmlRpc over internet: ~ 320 milliseconds</li>
* </ul>
*/
public class Latency implements I_Callback
{
private long startTime = 0L;
private boolean messageArrived = false;
private static Logger log = Logger.getLogger(Latency.class.getName());
public Latency(Global glob) {
try {
I_XmlBlasterAccess con = glob.getXmlBlasterAccess();
ConnectQos qos = new ConnectQos(glob);
con.connect(qos, this); // Login to xmlBlaster, register for updates
PublishKey pk = new PublishKey(glob, "Latency", "text/xml", "1.0");
PublishQos pq = new PublishQos(glob);
MsgUnit msgUnit = new MsgUnit(pk.toXml(), "Hi".getBytes(), pq.toXml());
SubscribeKey sk = new SubscribeKey(glob, "Latency");
SubscribeQos sq = new SubscribeQos(glob);
con.subscribe(sk.toXml(), sq.toXml()).getSubscriptionId();
int numSend = glob.getProperty().get("numSend", 10);
for (int ii=0; ii<numSend; ii++) {
startTime = System.currentTimeMillis();
con.publish(msgUnit);
while (true) {
try { Thread.sleep(50); } catch( InterruptedException i) {}
if (messageArrived) {
messageArrived = false;
break;
}
}
}
try { Thread.sleep(1000); } catch( InterruptedException i) {} // wait a second to receive update()
DisconnectQos dq = new DisconnectQos(glob);
con.disconnect(dq);
}
catch (Exception e) {
log.severe(e.toString());
}
}
public String update(String cbSessionId, UpdateKey updateKey, byte[] content,
UpdateQos updateQos)
{
long endTime = System.currentTimeMillis();
messageArrived = true;
log.info("Received asynchronous message '" + updateKey.getOid() +
"' from xmlBlaster - latency=" + (endTime - startTime) + " millis");
return "";
}
/**
* Try
* <pre>
* java javaclients.Latency -help
* </pre>
* for usage help
*/
public static void main(String args[]) {
Global glob = new Global();
if (glob.init(args) != 0) { // Get help with -help
System.out.println(glob.usage());
Global.instance().usage();
System.err.println("Example: java javaclients.Latency -loginName Jeff\n");
System.exit(1);
}
new Latency(glob);
}
}