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OReilly/Chap5/QRetailer.java

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		/*
		* Copyright (C) 2000, O'Reilly & Associates, Inc.
		* The code in this file may be copied, distributed, and reused,
		* provided that you do not remove this copyright notice.
		* O'Reilly & Associates assumes no responsibility for damages
		* resulting from the use of this code.
		*/

		package chap5.b2b;

		import java.util.StringTokenizer;
		import java.util.Properties;
		import javax.naming.*;
		import javax.jms.TopicConnectionFactory;
		import javax.jms.QueueConnectionFactory;
		import javax.jms.Topic;
		import javax.jms.Queue;
		import javax.jms.Session;
		import javax.jms.StreamMessage;
		import javax.jms.TextMessage;

		public class QRetailer implements javax.jms.MessageListener{

		private javax.jms.QueueConnection qConnect = null;
		private javax.jms.QueueSession qSession = null;
		private javax.jms.QueueSender qSender = null;

		private javax.jms.TopicConnection tConnect = null;
		private javax.jms.TopicSession tSession = null;

		private javax.jms.Topic hotDealsTopic = null;
		private javax.jms.TopicSubscriber tsubscriber = null;
		private static String uname = null;

		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);
		}
		}
		public void onMessage(javax.jms.Message aMessage){
		try{
		autoBuy(aMessage);
		}catch (java.lang.RuntimeException rte){
		rte.printStackTrace();
		}
		}
		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(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(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();
		}
		}
		}

		class InitialContext
		{
		String mBroker = null;

		public InitialContext (Properties env)
		{
		mBroker = env.getProperty("BROKER");
		return;
		}

		public Object lookup(String str) throws javax.naming.NamingException,
		javax.jms.JMSException
		{
		if ( str.equalsIgnoreCase("Hot Deals") )
		return (new progress.message.jclient.Topic(str));
		else if ( str.equalsIgnoreCase("Buy Order") )
		return (new progress.message.jclient.Topic(str));
		else if ( str.equalsIgnoreCase("Reply Q") )
		return (new progress.message.jclient.Queue("SampleQ1"));
		else if( str.equalsIgnoreCase("TopicConnectionFactory") )
		return (new progress.message.jclient.TopicConnectionFactory (mBroker));
		else if( str.equalsIgnoreCase("QueueConnectionFactory") )
		return (new progress.message.jclient.QueueConnectionFactory (mBroker));
		else // its whatever "Chat" topic was passed in on the command line
		return (new progress.message.jclient.Topic(str));
		}
		}
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OReilly/Chap5/QWBrowser.java

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		/*
		* Copyright (C) 2000, O'Reilly & Associates, Inc.
		* The code in this file may be copied, distributed, and reused,
		* provided that you do not remove this copyright notice.
		* O'Reilly & Associates assumes no responsibility for damages
		* resulting from the use of this code.
		*/

		package chap5.b2b;

		import java.util.StringTokenizer;
		import java.util.Properties;
		//import javax.naming.InitialContext;
		import javax.jms.TopicConnectionFactory;
		import javax.jms.QueueConnectionFactory;
		import javax.jms.Topic;
		import javax.jms.Queue;
		import javax.jms.QueueReceiver;
		import javax.jms.Session;
		import javax.jms.TextMessage;

		public class QWBrowser implements javax.jms.MessageListener{

		private javax.jms.TopicConnection tConnect = null;
		private javax.jms.TopicSession tSession = null;
		private javax.jms.TopicPublisher tPublisher = null;

		private javax.jms.QueueConnection qConnect = null;
		private javax.jms.QueueSession qSession = null;
		private javax.jms.QueueReceiver qReceiver = null;
		private javax.jms.Queue receiveQueue = null;

		private javax.jms.Topic hotDealsTopic = null;
		private javax.jms.TemporaryTopic buyOrdersTopic = null;
		private String uname = null;

		public QWBrowser (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 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);

		tSession =
		tConnect.createTopicSession(false,Session.AUTO_ACKNOWLEDGE);
		qSession =
		qConnect.createQueueSession(false,Session.AUTO_ACKNOWLEDGE);

		hotDealsTopic = (Topic)jndi.lookup("Hot Deals");
		receiveQueue = (Queue)jndi.lookup("Reply Q");

		tPublisher = tSession.createPublisher(hotDealsTopic);

		qReceiver = qSession.createReceiver(receiveQueue);
		((progress.message.jclient.QueueReceiver)qReceiver).setPrefetchThreshold(0);
		((progress.message.jclient.QueueReceiver)qReceiver).setPrefetchCount(1);

		// Now that setup is complete, start the Connection
		tConnect.start();
		}catch (javax.jms.JMSException jmse){
		jmse.printStackTrace(); System.exit(1);
		}catch(javax.naming.NamingException jne){
		jne.printStackTrace(); System.exit(1);
		}
		}
		private void publishPriceQuotes(String dealDesc, String username,
		String itemDesc, float oldPrice,
		float newPrice){
		try{
		javax.jms.StreamMessage message = tSession.createStreamMessage();
		message.writeString(dealDesc);
		message.writeString(itemDesc);
		message.writeFloat(oldPrice);
		message.writeFloat(newPrice);

		message.setStringProperty("Username", username);
		message.setStringProperty("itemDesc", itemDesc);

		message.setJMSReplyTo(receiveQueue);

		tPublisher.publish(
		message,
		javax.jms.DeliveryMode.PERSISTENT,
		javax.jms.Message.DEFAULT_PRIORITY,
		1800000);
		}catch ( javax.jms.JMSException jmse ){
		jmse.printStackTrace();
		}
		}
		public void onMessage( javax.jms.Message message){
		try{
		TextMessage textMessage = (TextMessage) message;
		String text = textMessage.getText();
		System.out.println("Order received - "+text+
		" from " + message.getJMSCorrelationID());
		}catch (java.lang.Exception rte){
		rte.printStackTrace();
		}
		}
		private int examineQueue(int inStockQty)
		{
		int cnt = 0;
		int bestQty = 0;
		try{
		// qConnect.start();
		System.out.println("In Stock QTY: " + inStockQty);
		System.out.print ( "Creating QueueBrowser..." );
		javax.jms.QueueBrowser browser
		= qSession.createBrowser(receiveQueue);
		System.out.println ("[done]");

		java.util.Enumeration e = browser.getEnumeration();
		while(e.hasMoreElements()){
		System.out.print(" --> getting message "
		+ String.valueOf(++cnt) + "...");
		javax.jms.TextMessage message =
		(javax.jms.TextMessage) e.nextElement();
		System.out.println("[" + message.getText() + "]");
		if (message != null){
		int orderQty = message.getIntProperty("QTY");
		if( orderQty > bestQty && orderQty <= inStockQty)
		bestQty = orderQty;
		}
		}
		// Free any resources in the browser.
		browser.close();
		}catch( javax.jms.JMSException jmse ){
		jmse.printStackTrace();
		}
		System.out.println("\nBestQty: " + bestQty);
		return bestQty;
		}
		public void processInput(){
		try{
		// 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 ){
		System.out.println ("Enter: Item, Old Price, New Price ");
		System.out.println("\ne.g. Bowling Shoes, 100.00, 55.00");
		String dealDesc = stdin.readLine();
		if(dealDesc != null && dealDesc.length() > 0){
		// parse the deal description
		StringTokenizer tokenizer =
		new StringTokenizer(dealDesc,",") ;
		String itemDesc = tokenizer.nextToken();
		String temp = tokenizer.nextToken();
		float oldPrice =
		Float.valueOf(temp.trim()).floatValue();
		temp = tokenizer.nextToken();
		float newPrice =
		Float.valueOf(temp.trim()).floatValue();

		publishPriceQuotes(dealDesc,uname,
		itemDesc, oldPrice,newPrice);
		int inStockQty =
		(int)(java.lang.Math.random() * (double)1000);
		int bestQty = examineQueue(inStockQty);
		qConnect.start();
		javax.jms.TextMessage textMessage = null;
		while( true )
		{
		textMessage =
		(javax.jms.TextMessage)qReceiver.receive(1000);
		if ( textMessage == null ){
		qConnect.stop();
		break; // no more messages to get
		}

		String text = textMessage.getText();
		int qty = textMessage.getIntProperty("QTY");
		System.out.println("\nOrder received - "+text+
		" from " + textMessage.getJMSCorrelationID());

		// could have missed the first one
		if( qty > bestQty && qty <= inStockQty)
		bestQty = qty;
		if (qty == bestQty){
		System.out.println("Fulfilling order");
		// Do some processing to fulfill order
		}else{
		System.out.println("Placing in BACK-ORDER status");
		// Do some processing to create BACK-ORDER status
		}
		}
		}else{
		this.exit();
		}
		}
		}catch (javax.jms.JMSException jmse){
		jmse.printStackTrace();
		}catch( java.io.IOException ioe ){
		ioe.printStackTrace();
		//}catch( java.lang.InterruptedException ie ){
		// ie.printStackTrace();
		}
		}
		public void exit(){
		try{
		tConnect.close();
		qConnect.close();
		}catch (javax.jms.JMSException jmse){
		jmse.printStackTrace();
		}
		System.exit(0);
		}
		public static void main(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 QWholesaler broker username password");
		return;
		}

		QWBrowser wholesaler = new QWBrowser(broker, username, password);
		wholesaler.processInput();
		}
		}

		class InitialContext
		{
		String mBroker = null;

		public InitialContext (Properties env)
		{
		mBroker = env.getProperty("BROKER");
		return;
		}

		public Object lookup(String str) throws javax.naming.NamingException,
		javax.jms.JMSException
		{
		if ( str.equalsIgnoreCase("Hot Deals") )
		return (new progress.message.jclient.Topic(str));
		else if ( str.equalsIgnoreCase("Buy Order") )
		return (new progress.message.jclient.Topic(str));
		else if ( str.equalsIgnoreCase("Reply Q") )
		return (new progress.message.jclient.Queue("SampleQ1"));
		else if( str.equalsIgnoreCase("TopicConnectionFactory") )
		return (new progress.message.jclient.TopicConnectionFactory (mBroker));
		else if( str.equalsIgnoreCase("QueueConnectionFactory") )
		return (new progress.message.jclient.QueueConnectionFactory (mBroker));
		else // its whatever "Chat" topic was passed in on the command line
		return (new progress.message.jclient.Topic(str));
		}
		}
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OReilly/Chap5/QWholesaler.java

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OReilly/Chap6/QRetailer.java

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