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This makes sense, because the button should be enabled only when the operation has not yet been startedTurning this the other way up, it should be disabled when the operation has been startedThe expression required to assign the correct state to the stop button is slightly more complex:
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The easiest way to understand this is to work out when the button should be enabled and then invert the condition it should be possible to stop an operation if it has been started and it is not yet done Inverting this, we get the condition shown above for disabling the button The triggers on lines 57 to 67 of Listing 27-13 let you see the changes to the started, stopped, failed, succeeded, done, and causeOfFailure variables as they occur Here s the output that results from the normal completion of the HttpRequest:
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started: true done: true succeeded: true
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If the operation failed because the document you are trying to fetch does not exist, you would see the following:
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started: true failed: true causeOfFailure: javaioFileNotFoundException: (file name not shown) done: true
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Most nontrivial applications are likely to need to perform an operation that would take long enough to complete that it could not be allowed to execute in the application s main thread, because to do so would block user interaction and make the application appear to be unresponsiveThe classes that you have seen so far in this chapter let you access resources on the Internet without blocking the user interface, but there is (at least at the time of this writing) no prepackaged solution for asynchronous access to other information sources that are not capable of delivering data immediately, such as databases In this section, you ll see how to create a JavaFX application that populates a ListView control from the values in a database tableThe focus will be on the data access part of the application, which we will perform in a background thread, rather than on how we display the results to the user If you want to look at the code that creates the user interface, you ll find it in the file javafxdata/TaskExample2fxThe result of running this code is shown on the left of Figure 27-7 As you can see, the ListView control is initially empty If you click the Fetch Customers button, there will be a small delay, and then the ListView will be populated with a set of customer names obtained from a database tableThe reported progress will also change from 0 to 100, as shown on the right of Figure 27-7
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Figure 27-7
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A JavaFX database application
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To run this example, you need to be running a database server that has a table containing the customer data to be displayed in the ListViewThe easiest way to achieve this is to install the GlassFish application server, the JavaDB database, and the NetBeans IDE plug-ins needed to access them, as described in the PrefaceAs part of this installation, a sample database containing the data used by this example will be added to the JavaDB database serverTo start the server from with NetBeans, display the Services tab in the IDE and open the Databases nodeYou should see an entry for a JavaDB database server on your machine, as shown in Figure 27-8To start the database server, right-click its node, and select Connect from the context menuAfter a few seconds, the database will be running and, if you now expand the database node, you ll find the CUSTOMERS table, which will be the source of the data for the example application
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Figure 27-8
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Viewing the sample database in the NetBeans IDE
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To access the database, we need to create a class that can be configured with the information needed to locate and connect to a database server, will read the content of the CUSTOMERS table in a background thread, and will finally deliver the data that we need to a callback function in the application s main thread Here s a sketch of what this class might look like11:
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