code128 barcode generator vb.net 8: Messaging in Java

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8: Messaging
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FIGURE 8-5
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Publish/subscribe (pub/sub) model
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How the Publish/Subscribe Message Model Works
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The pub/sub message model allows an application to publish messages on a one-tomany or a many-to-many basis. Figure 8-5 is a diagram depicting the pub/sub model. Following are some examples of a pub/sub implementation:
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n Sending sales forecasts to various people in an organization n Sending news items to interested parties n Sending stock prices to traders on the trading floor
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Messages are published to a topic (or subject). One or more publishers can publish messages to the same topic. Any client application that wants to receive messages on this topic must first subscribe to the topic. Multiple clients can subscribe to the topic and subsequently receive a copy of the message. In the nondurable subscription model, the subscriber must be connected at the time a message is published to receive that message. If no subscribers are online, the messages will be published and destroyed soon thereafter. The subscriber can also use a durable subscription model, in which case the messages will be received when the subscriber is reconnected to the topic. Durable subscriptions come with greater overhead because they require additional resources to persist the messages until they can be delivered to all of the known durable subscribers. The following is a list of the steps and interface classes required for the pub/sub model of communication: 1. Obtain the TopicConnectionFactory object via a JNDI lookup (the JNDI name will vary depending on the messaging vendor and site naming conventions). 2. Obtain a TopicConnection to the provider via the TopicConnectionFactory. (If security is enabled, pass a user ID and password to the createTopic Connection method.)
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3. Obtain a TopicSession with the provider via the TopicConnection. 4. Obtain the topic via a JNDI lookup. (The JNDI name will vary depending on the messaging vendor and site naming conventions.) 5. Create either a TopicPublisher or a TopicSubscriber via the TopicSession for the required topic. 6. Publish and/or receive messages. 7. Close the TopicPublisher or TopicSubscriber, the session, and the connection. In this example, the publishing client publishes text and object messages to the topic. The subscribing client receives the text and object messages from the topic. The text messages are displayed, and the object messages are executed. Note that the JNDI name for the connection factory and the queue will differ according to the messaging vendor and site naming convention. Here is the code for the publishing client:
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package javaee.architect; import java.io.*; import java.util.*; import javax.naming.*; import javax.jms.*; public class PSPublish { private static final String THIS = "PSPublish"; public static final String JMS_FACTORY = "myTopicConnectionFactory"; public static final String TOPIC = "myTopic1"; public static void main(String[] args) throws Exception { // get the initial context InitialContext ctx = new InitialContext(System.getProperties()); // lookup the topic connection factory TopicConnectionFactory tconnf = (TopicConnectionFactory) ctx.lookup(JMS_FACTORY); // create a topic connection TopicConnection tconn = tconnf.createTopicConnection(); //tconn.setClientID(THIS); // create a topic session TopicSession tsess = tconn.createTopicSession(false, Session.AUTO_ACKNOWLEDGE); // lookup the topic object Topic topic = (Topic) ctx.lookup(TOPIC); // create a topic publisher TopicPublisher tpublish = tsess.createPublisher(topic); tpublish.setDeliveryMode(DeliveryMode.PERSISTENT); // start the connection
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8: Messaging
tconn.start(); log("Started."); ObjectMessage omsg = tsess.createObjectMessage(); TextMessage tmsg = tsess.createTextMessage(); publishText(tpublish, tmsg, "Market open."); publishObject(tpublish, omsg, new PSOrder("BUY", "200", "UCNY")); publishObject(tpublish, omsg, new PSOrder("BUY", "100", "UCUS")); publishObject(tpublish, omsg, new PSOrder("SELL", "50", "UC")); publishText(tpublish, tmsg, "Market closed."); publishText(tpublish, tmsg, "After hours market open."); publishObject(tpublish, omsg, new PSOrder("SELL", "25", "UC")); publishObject(tpublish, omsg, new PSOrder("BUY", "150", "UCUS")); publishText(tpublish, tmsg, "After hours market closed."); publishText(tpublish, tmsg, "***CLOSE***"); // Close message // close up tpublish.close(); tsess.close(); tconn.close(); ctx.close(); log("Finished."); } public static void publishObject(TopicPublisher tpublish, ObjectMessage omsg, Serializable obj) { try { log(obj.toString()); omsg.setObject(obj); tpublish.publish(omsg); sleep(1000); } catch (Exception e) { log("Can't publish message: " + e); } } public static void publishText(TopicPublisher tpublish, TextMessage tmsg, String s) { try { log(s.toString()); tmsg.setText(s); tpublish.publish(tmsg); sleep(1000); } catch (Exception e) { log("Can't publish message: " + e); } } private static void log(String msg) { System.out.println(new java.util.Date()+" "+THIS+" "+msg); } private static void sleep(int m) { try { Thread.currentThread().sleep( m ); } catch (Exception e) {} } }
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