java barcode generator library Point-to-Point (PTP) model in Java

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Point-to-Point (PTP) model
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2. Obtain a QueueConnection to the provider via the QueueConnectionFactory. (If security is enabled, pass a user ID and password to the createQueue Connection method.) 3. Obtain a QueueSession with the provider via the QueueConnection. 4. Obtain the queue via a JNDI lookup (the JNDI name will vary depending on the messaging vendor and site naming conventions). 5. Create either a QueueSender or a QueueReceiver via the QueueSession for the required queue. 6. Send and/or receive messages. 7. Close the QueueConnection (this will also close the QueueSender or Queue Receiver, and the QueueSession). In the following example code, a JMS client sends a variety of TextMessages and ObjectMessages to a queue. Some of these messages are marked with a property called Interesting that is set to true. The sending client finishes up by sending text messages containing the text finish to indicate to the receiver that it can stop processing. The receiving JMS client is started with or without a command-line argument, and it will process the messages in the queue according to this argument setting. The JNDI name for the connection factory and the queue will differ across messaging vendor implementations and also depend on your site s naming conventions. Here is the code for the sending client:
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package javaee.architect; import java.util.*; import javax.naming.*; import javax.jms.*; public class PTPSend { private static final String THIS = "PTPSend"; public static final String JMS_FACTORY = "myQueueConnectionFactory"; public static final String QUEUE = "myQueue1"; public static void main(String[] args) throws Exception { // get the initial context InitialContext ctx = new InitialContext(System.getProperties()); // lookup the queue connection factory QueueConnectionFactory qconnf = (QueueConnectionFactory) ctx.lookup(JMS_FACTORY);
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// create a queue connection QueueConnection qconn = qconnf.createQueueConnection(); // create a queue session QueueSession qsess = qconn.createQueueSession( false, Session.AUTO_ACKNOWLEDGE); // lookup the queue object Queue queue = (Queue) ctx.lookup(QUEUE); // create a queue sender QueueSender qsend = qsess.createSender(queue); qsend.setDeliveryMode(DeliveryMode.NON_PERSISTENT); // start the connection qconn.start(); // get the number of messages to send int numMsgs = (args.length > 0) new Integer(args[0]).intValue() : 10; // create messages Message msg = qsess.createMessage(); TextMessage tmsg = qsess.createTextMessage(); ObjectMessage omsg = qsess.createObjectMessage(); Hashtable hTable = new Hashtable(); log("Started."); // send the messages for (int i=0,j=0,k=0; i < numMsgs; i++) { j++;k++; //Increment counters if (k == 1) { tmsg.setText("News item #"+(i+1)); // randomly set the Interesting property to true or false tmsg.setBooleanProperty("Interesting",((j==3) true:false)); log(tmsg.getText()+((j==3) " (Interesting)":"")); qsend.send(tmsg); } else { hTable.clear(); hTable.put("symbol","ucny"); hTable.put("bid",new String(""+(100+i))); hTable.put("ask",new String(""+(100+i+1))); omsg.setObject(hTable); // randomly set the Interesting property to true or false omsg.setBooleanProperty("Interesting",((j==3) true:false)); log(hTable+((j==3) " (Interesting)":"")); qsend.send(omsg); k=0; //reset counter } if (j==3) j=0; } // create a couple of close messages tmsg.setText("***CLOSE***");
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// set the Interesting property to true on this one tmsg.setBooleanProperty("Interesting", true); log(tmsg.getText()+" (Interesting)"); qsend.send(tmsg); // set the Interesting property to false on this one tmsg.setBooleanProperty("Interesting", false); log(tmsg.getText()); qsend.send(tmsg); // close up qsend.close(); qsess.close(); qconn.close(); ctx.close(); log("Finished."); } private static void log(String msg) { System.out.println(new java.util.Date()+" "+THIS+" "+msg); } }
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Here is the code for the receiving client. Note that the receiving client has been coded by implementing a message listener:
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package javaee.architect; import javax.naming.*; import javax.jms.*; public class PTPReceive implements MessageListener { private static final String THIS = "PTPReceive"; public static final String JMS_FACTORY = "myQueueConnectionFactory"; public static final String QUEUE = "myQueue1"; private InitialContext ctx; protected QueueConnectionFactory qconnf; protected QueueConnection qconn; protected QueueSession qsess; protected Queue queue; protected QueueReceiver qrecv; private boolean quit = false; public boolean ready; public static void main(String[] args) throws Exception { // instantiate the receiver, if there is no argument // pass a null to the constructor. PTPReceive rec = new PTPReceive(args.length>0 args[0]:null); // if constructor code does not initialize, we exit. if (!rec.ready) { log("Not ready to receive messages.");
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