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Client client = new Client(); try { clientoutletNumber = LongparseLong(args[0]); clienturl = SystemgetProperty("jswserverURL", "t3://localhost:7001"); } catch(Exception e) { Systemerrprintln(e); return; } clientrun(); } /**
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* The application main loop * The application will receive orders and print them out */ public void run() { try { orderReceiver = new OrderReceiver(); Context context = UtilgetlnitialContext(url); orderReceiverini t(context, OrderReceiverQUEUE, "outletNumber = " + outletNumber);
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The next step is critical A synchronized block is started on the order receiver When the orderReceiver wait () method is called, the main thread of execution is blocked waiting for the order receiver to return control When it does so, and it is not a quit, it retrieves the objects from the message and calls the saveOrder () method:
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while (true) { synchronized(orderReceiver) { try { orderReceiverwait(); if (orderReceiverquit) break; else { Systemoutprintln( "New order received in jswc07faxClient"); Customer customer = (Customer)orderReceiverhashTableget("customer"); OrderMaster orderMaster = (OrderMaster)orderReceiverhashTableget("orderMaster"); Vector orderDetails = (Vector)orderReceiverhashTableget("orderDetail"); saveOrder(customer, orderMaster, orderDetails); } } catch (InterruptedException ie) { Systemerrprintln(ie); } } }
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The second method is saveOrder ( ) For the purposes of this experiment, this method only displays the objects that make up the order on the console where the WebLogic server was started For any practical application this method should contain the logic to handle the actual order
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The Order Receiver
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This class is similar to the order producer The init () method defines the connection factory, creates the connection and the session, and verifies that there is a queue to listen to Then it creates the actual receiver and starts to listen:
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package jswc07fax;
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import javarmiRemoteException; import j avaxnaming*; import j avaxjms*; import javautil*; /** * This class implements the MessageListener Interface to asynchronously * receive JMS messages with orders * * @see jswcOVfaxClient */ public class OrderReceiver implements MessageListener { /** * The name of the JMS queue connection factory */ public final static String JMS_FACTORY = "javaxjmsQueueConnectionFactory"; /** * The name of the "order" queue */ public final static String QUEUE = "jsworderQueue"; protected QueueConnectionFactory queueConnectionFactory = null; protected QueueConnection queueConnection = null; protected QueueSession queueSession = null; protected Queue queue = null; protected QueueReceiver receiver = null; public boolean quit = false; public Hashtable hashTable = null; /** * This method initializes all the objects */ public void init(Context ctx, String queueName, String selector) throws NamingException, JMSException, RemoteException { queueConnectionFactory = (QueueConnectionFactory) ctxlookup(JMS_FACTORY) ; queueConnection = queueConnectionFactorycreateQueueConnection(); queueSession = queueConnectioncreateQueueSession(false SessionAUTO_ACKNOWLEDGE);
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try {
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queue = (Queue) ctxlookup(queueName); } catch(NamingException ne){ queue = queueSessioncreateQueue(queueName); ctxbind(queueName, queue); } receiver = queueSessioncreateReceiver(queue, selector); receiversetMessageListener(this); queueConnectionstart() ; Systemoutprintln("OrderReceiver: JMS conection opened"); } /** * This method closes all the objects */ public void close() throws JMSException { receiverclose(); queueSessionclose(); queueConnectionclose(); Systemoutprintln("OrderReceiver: JMS conection closed"); }
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Once the message has arrived, the onMessage () method is called: /**
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* This is a call-back method * This method is called when a message is received with an order */ public void onMessage(Message msg) { String msgText = ""; quit = false; try { if (msg instanceof ObjectMessage) { hashTable = (Hashtable)((ObjectMessage)msg)getObjectO; Systemoutprintlnt"msg received!"); } else { msgText = msg toStringO ; } } catch(Exception e){ Systemerrprintln(e); } if (msgTextequalsIgnoreCase("quit")) { synchronized (this) { quit = true; } } synchronized(this) { thisnotifyAll(); } }
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The body of the message is retrieved into a hash table and a message is displayed The synchronized call returns the control to the main thread
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As the WebLogic server uses a relational database for persistency, some special tables have to be created to store the messages This has already been done within the script setDB cmd provided and executed in 2 In this script a call is made to the program supplied by WebLogic called utils Schema As the Troops are using Oracle, the command line to use is:
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C:\jdkl3\bin\java utilsSchema jdbc:weblogicroracle \ weblogicjdbcociDriver \ -s %DBSERVER% -u %DBUSER% -p %DBPASS% -verbose \c:\weblogic\classes\weblogic\jms\ddl\jms_oracleddl
In the weblogic properties file, aJDBC connection pool is defined for JMS use, as well as the queue for the orders: