QRetailerpublic class QRetailer extends Object implements javax.jms.MessageListener
| Fields Summary |
|---|
| private javax.jms.QueueConnection | qConnect | | private javax.jms.QueueSession | qSession | | private javax.jms.QueueSender | qSender | | private javax.jms.TopicConnection | tConnect | | private javax.jms.TopicSession | tSession | | private javax.jms.Topic | hotDealsTopic | | private javax.jms.TopicSubscriber | tsubscriber | | private static String | uname |
| Constructors Summary |
|---|
public QRetailer(String broker, String username, String password)
try{
TopicConnectionFactory tFactory = null;
QueueConnectionFactory qFactory = null;
InitialContext jndi = null;
uname = username;
Properties env = new Properties();
// ... specify the JNDI properties specific to the JNDI SPI being used
env.put("BROKER", broker);
jndi = new InitialContext(env);
tFactory =
(TopicConnectionFactory)jndi.lookup("TopicConnectionFactory");
qFactory =
(QueueConnectionFactory)jndi.lookup("QueueConnectionFactory");
tConnect =
tFactory.createTopicConnection (username, password);
qConnect =
qFactory.createQueueConnection (username, password);
tConnect.setClientID(username);
qConnect.setClientID(username);
tSession =
tConnect.createTopicSession(false,
Session.AUTO_ACKNOWLEDGE);
qSession =
qConnect.createQueueSession(false,
javax.jms.Session.AUTO_ACKNOWLEDGE);
hotDealsTopic = (Topic)jndi.lookup("Hot Deals");
hotDealsTopic = tSession.createTopic ("Hot Deals");
tsubscriber = tSession.createDurableSubscriber(hotDealsTopic,
"Hot Deals Subscription");
tsubscriber.setMessageListener(this);
tConnect.start();
}catch (javax.jms.JMSException jmse){
jmse.printStackTrace();
System.exit(1);
}catch(javax.naming.NamingException jne){
jne.printStackTrace(); System.exit(1);
}
|
| Methods Summary |
|---|
| private void | autoBuy(javax.jms.Message message)
try{
StreamMessage strmMsg = (StreamMessage)message;
String dealDesc = strmMsg.readString();
String itemDesc = strmMsg.readString();
float oldPrice = strmMsg.readFloat();
float newPrice = strmMsg.readFloat();
System.out.println("Received Hot Buy :"+dealDesc);
// if price reduction greater than 10 percent, buy
if (newPrice == 0 || oldPrice / newPrice > 1.1){
int count = (int)(java.lang.Math.random() * (double)1000);
System.out.println ("\nBuying " + count + " " + itemDesc);
TextMessage textMsg = tSession.createTextMessage();
textMsg.setText(count + " " + itemDesc );
textMsg.setIntProperty("QTY", count);
textMsg.setJMSCorrelationID(uname);
Queue buyQueue = (Queue)message.getJMSReplyTo();
qSender = qSession.createSender(buyQueue);
qSender.send( textMsg,
javax.jms.DeliveryMode.PERSISTENT,
javax.jms.Message.DEFAULT_PRIORITY,
1800000);
}else{
System.out.println ("\nBad Deal. Not buying");
}
}catch (javax.jms.JMSException jmse){
jmse.printStackTrace();
}
| | private void | exit(java.lang.String s)
try {
if ( s != null &&
s.equalsIgnoreCase("unsubscribe"))
{
tsubscriber.close();
tSession.unsubscribe("Hot Deals Subscription");
}
tConnect.close();
qConnect.close();
}catch (javax.jms.JMSException jmse){
jmse.printStackTrace();
}
System.exit(0);
| | public static void | main(java.lang.String[] argv)
String broker, username, password;
if(argv.length == 3){
broker = argv[0];
username = argv[1];
password = argv[2];
}else{
System.out.println("Invalid arguments. Should be: ");
System.out.println
("java QRetailer broker username password");
return;
}
QRetailer retailer = new QRetailer(broker, username, password);
try{
System.out.println("\nRetailer application started.\n");
// Read all standard input and send it as a message.
java.io.BufferedReader stdin =
new java.io.BufferedReader
( new java.io.InputStreamReader( System.in ) );
while ( true ){
String s = stdin.readLine();
if ( s == null )retailer.exit(null);
else if ( s.equalsIgnoreCase("unsubscribe") )
retailer.exit ( s );
}
}catch ( java.io.IOException ioe ){
ioe.printStackTrace();
}
| | public void | onMessage(javax.jms.Message aMessage)
try{
autoBuy(aMessage);
}catch (java.lang.RuntimeException rte){
rte.printStackTrace();
}
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