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Here is the code for the object that is published:
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package javaee.architect; import java.io.Serializable; // The object implements 'Runnable' so that the receiver // can call the run() method. This is not a typical use // of messaging nor of runnable objects. public class PSOrder implements Runnable, Serializable { String side; String security; String quantity; /* constructor methods */ public PSOrder() { setSide("<side not set>"); setQuantity("<quantity not set>"); setSecurity("<security not set>"); } public PSOrder(String t, String q, String s) { setSide(t); setQuantity(q); setSecurity(s); } /* run method */ public void run() { System.out.println(new java.util.Date()+" PSOrder "+this.toString()); } /* toString method */ public String toString() { return getSide()+" "+getQuantity()+" "+getSecurity(); } /* get/set methods */ public String getSide() { return side; } public void setSide(String t) { side = t; } public String getSecurity() { return security; } public void setSecurity(String s) { security = s; }
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8: Messaging
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public String getQuantity() { return quantity; } public void setQuantity(String s) { quantity = s; } }
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Here is the code for the subscribing client. Note that the subscribing client has been coded by implementing a message listener:
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package javaee.architect; import java.util.*; import javax.naming.*; import javax.jms.*; public class PSSubscribe implements MessageListener { private static String THIS = "PSSubscribe"; public static final String JMS_FACTORY = "myTopicConnectionFactory"; public static final String TOPIC = "myTopic1"; private InitialContext ctx; private TopicConnectionFactory tconnf; private TopicConnection tconn; private TopicSession tsess; private TopicSubscriber tsubscribe; private Topic topic; private boolean quit = false; public boolean ready; public static void main(String[] args) { PSSubscribe sub = new PSSubscribe(args.length>0 args[0]:""); if (!sub.ready) { log("Not ready to subscribe to messages."); System.exit(-1); } log("Started."); sub.run(); sub.close(); log("Finished."); } public PSSubscribe(String durable) { THIS = THIS+durable; try { ctx = new InitialContext(System.getProperties()); tconnf = (TopicConnectionFactory) ctx.lookup(JMS_FACTORY); tconn = tconnf.createTopicConnection(); tconn.setClientID(THIS);
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tsess = tconn.createTopicSession(false, Session.AUTO_ACKNOWLEDGE); topic = (Topic) ctx.lookup(TOPIC); // Create a durable or non-durable based on argument if (durable.equalsIgnoreCase("durable")) tsubscribe = tsess.createDurableSubscriber(topic, tconn.getClientID()); else tsubscribe = tsess.createSubscriber(topic); tsubscribe.setMessageListener(this); // start the connection tconn.start(); ready = true; } catch (Exception e) { ready = false; log("Initialization failed. "+e); close(); } } public void run() { if (!ready) return; synchronized (this) { while (!quit) { try { wait(); } catch (InterruptedException ie) { } } } } public void onMessage(Message msg) { if (!ready) return; // Declare a reference for the 'Runnable' object messages Runnable obj = null; try { if (msg instanceof ObjectMessage) { try { obj = (Runnable) ((ObjectMessage) msg).getObject(); } catch (Exception e) { log("Message is not an object!"); return; } // The object messages implement 'Runnable'. This is not // a typical use of messaging nor of runnable objects. try { if (obj != null) { obj.run(); } } catch (Exception e) { log("Can't run the object."); }
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8: Messaging
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} else if (msg instanceof TextMessage) { String text = ((TextMessage) msg).getText(); log(text); if (text.equals("***CLOSE***")) { synchronized (this) { quit = true; notifyAll(); } } } else { log("Message must be ObjectMessage or TextMessage."); log(msg.toString()); } } catch (Exception e) { log("Can't receive message: " + e); } } public void close() { try { if (tsubscribe != null) tsubscribe.close(); if (tsess != null) tsess.close(); if (tconn != null) tconn.close(); if (ctx != null) ctx.close(); } catch (Exception e) { log("Can't close up. "+e); } } private static void log(String msg) { System.out.println(new java.util.Date()+" "+THIS+" "+msg); } }
When executed, here is the output from the publishing client:
Sun Sun Sun Sun Sun Sun Sun Sun Sun Sun Sun Sun Oct Oct Oct Oct Oct Oct Oct Oct Oct Oct Oct Oct 01 01 01 01 01 01 01 01 01 01 01 01 17:25:25 17:25:25 17:25:27 17:25:28 17:25:29 17:25:30 17:25:31 17:25:32 17:25:34 17:25:35 17:25:36 17:25:37 EDT EDT EDT EDT EDT EDT EDT EDT EDT EDT EDT EDT 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 PSPublish PSPublish PSPublish PSPublish PSPublish PSPublish PSPublish PSPublish PSPublish PSPublish PSPublish PSPublish Started. Market open. BUY 200 UCNY BUY 100 UCUS SELL 50 UC Market closed. After hours market open. SELL 25 UC BUY 150 UCUS After hours market closed. ***CLOSE*** Finished.
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