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In this example, the client sends a message to the DatagramListener and the DatagramListener responds with a message of its own When the client finishes running, it closes the connections and the application exits The DatagramListener, however, continues running and waits for another message Shutting down the listener thread As with the SocketListener, DatagramListener is implemented on its own thread and therefore must support the ability for an external object to shut it down In our example, MsgListener makes the call to shutdown() when the MsgListener application exits Since the shutdown() method is invoked by a thread different from the one that our socket listening code is running, all we can really do is set a flag so that the thread within the listen-respond loop can check the status of this flag periodically during execution and take appropriate action The same problem that existed with SocketListener applies to the DatagramListener.

At the point shutdown() is called the DatagramListener is most likely to be waiting for an incoming message As a result, the listening thread is unavailable to check the status of the shutdown flag The only events that allow the listener to stop listening for incoming messages and inspect the shutdown status are if a datagram connection is made or a timeout occurs To take advantage of this situation, the listener requests to be notified of timeouts when the Datagram connection is opened If a timeout occurs, an InterruptedIOException exception is thrown By catching this exception and checking the status of the shutdown flag the DatagramListener can respond appropriately Enhancing the MessageListener The next step is to enhance the MessageListener created during the socket example to be able to listen for datagrams as well.

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Listing 3-5. The OFFERINGS Table create table ( course , begindate , trainer , location OFFERINGS varchar2(6) date number(4) varchar2(8) not null not null );

The Control Panel is a centralized panel where the administrator can jump to the most common parts of the site. This page is essentially the home page of the Administrator interface. While at first glance the page may reveal only a number of navigation buttons,

The following lines of code are required to create a DatagramListener instance when the datagram option is selected from the menu The following method was intentionally left blank on the previous exercise Now that we have a DatagramListener, we can fill in the details..

Listing 3-6. The REGISTRATIONS Table create table ( attendee , course , begindate , evaluation REGISTRATIONS number(4) not null varchar2(6) not null date not null number(1) );

CHAPTER 5 s ADMINISTERING JOOMLA!

private datagramListener() { if (datagramListener == null) { datagramListener = new DatagramListener(outputForm); datagramListener.start(); } }

Listing 3-7. The HISTORY Table create table ( empno , beginyear , begindate , enddate , deptno , msal , comments HISTORY number(4) number(4) date date number(2) number(6,2) varchar2(60) not null not null not null not null not null );

We will also need to add a member variable to hold onto the DatagramListener reference. The following line of code needs to be added to the top of the MessageListener class.

there are three useful items on the right side of the Control Panel that are often overlooked by Joomla webmasters the Preview button, introductory text removal instructions, and the administrative panels. As you can see in Figure 5-10, the Preview button is available on the toolbar (and active from most locations in the Administrator interface). It provides a hyperlink to the Frontpage of the Joomla site for quick access. You can use this Preview hyperlink to open the home page in another window so that any changes made through the Administrator interface can be quickly evaluated.

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