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* This class is a Java application that receives messages from the * Operations Center * This application is a JMS Pub/Sub client that receives JMS messages * with tickets and updates a venue graphical display It also * supports ticket selling by using the <tt>TicketServicesSL</tt> bean * <pre> * usage: Java -Djswserver=host jswcO reservationClient matchNumber * </pre> * @see jswcOVTicketServicesSL */ public class Client implements ActionListener { /** * This is the application's entry point * It retrieves the parameters from the environment and from the * calling arguments and starts execution */ public static void main(String args[]) { if (argslength != 1) { Systemerrprintln ( "usage: Java -Djswserver=host jswcOVreservationClient matchNumber"}; return; } Client client = new Client(); try { clientmatchNumber = LongparseLong(args[0]); clienturl = "t3://" + SystemgetProperty("jswserver", "localhost") + " :7001" ; } catch(Exception e) { Systemerrprintln(e); return ; } clientrun(); }
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The run () method first calls the ereatedFrame () method, which conducts the Swing elements and presents a view of the venue as shown here:
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Every little green box is an available seat The actual basketball court is where the logo of E-Pizza is The buttons at the bottom provide the basic operational functionality The operator can:
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Buy a seat (or seats)
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Q Cancel a purchased seat (not implemented in this experiment) Q Update the screen by reading all the purchased seats from the database Q Clear a selected seat (or seats) Q Quit the application Next, the run () method will start the listener and subscribe to the topic with a selector that will choose the desired match:
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* The application main loop * The application will receive "ticket messages" and will update * the venue display */ public void run() ( createFrame(); try { ticketReceiver = new TicketReceiver[); Context context = Util getlnitialContext (url) ,-ticketReceiverinit(context,
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TicketReceiverTOPIC, "matchHuihber = " + matchKumber);
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Then the loadSeats () method is called to bring all (he existing sold seats from the database Nole the order of the sequence You need to activate the listener and subscribe to the topic before loading the sold seats so that you don't lose any real-time information loadSeatsO; while(true) {
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synchronized I ticketReceiver) ( try { ticketReceiverwait{) ; if (ticketReceiverquit) break; else ( int status = 0; if (ticketReceivertypeequals("cancelled")) status = SeatAVAILABLE; if {ticketReceivertypeequals!"sold"})
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status = SeatSOLD; etAvailsetText{"Available: " + ticketReceiveravailable); venueupdateSeatsIticketReceivertickets,
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) catch {}}) (InterruptedException ie)
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status); )
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The following figure presents the view of the venue after it has loaded the sold seats In reality you will not actually see the screen as presented previously This is because the operation is so fast that you will only really see the screen as shown here
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Now comes the tricky part The next diagram shows how all these things interrelate It might not be an accurate picture as far as the internal workings of the JVM goes, but it will provide a good understanding of the scenario
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Thread number 1, denoted by the arrows Cl, C2 and C3, is started by the main () method of the client Arrow C2 of the main thread is where it synchronizes with the JMS Listener and then waits for a message to arrive This thread ia now blocked at the Listener Liberation comes when the following statement is executed in the onMessage () method of the listener: synchronized(this) thisnotifyAll(); I {
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Thread number 2 is from the JMS world It is denoted by arrows Jl andJ2 When arrow Jl gets a message gets to the listener, a hand over occurs in the oriMessage () method:
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* This is a call-back method * This method is called when a message is received with tickets */ public void onMessage(Message msg) { String msgText = " ,-quit = false; try { matchNumber = msggetLongProperty("matchNumber"); if (msg instanceoE MapMessage) ( available = ((MapMessage)msg)getlnt("availableSeats"); tickets = ((MapMessage)msg)getString("tickets"); type = ((MapMessage)msg)getstring("type"); } else { msgText = msg,toStringi);