Progress Monitoring in Java

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Progress Monitoring
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The progress and progressMax variables allow a task to periodically report how much of an operation has been performed If a task chooses to report progress, the Task class will maintain a third variable percentDone that represents the proportion of the operation that has been completed In the case of an operation that has just begun and not yet
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Tasks and Progress Monitoring
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made any progress, the percentDone variable would be 0, while for one that has succeeded it would have the value 1 It is important to note the following if you plan to use these variables:
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Task implementations are not required to report progress at all In this case, all three variables will have the value -1, which is conventionally interpreted to mean that the amount of progress made is unknown A task that reports progress must set both the progress and progressMax variables before the value of the percentDone variable will be set If either of these variables is subsequently changed (which is very likely in the case of progress but less likely for progressMax), the value of percentDone will be recalculated accordingly
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A State Monitoring Example
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The HttpRequest class correctly maintains the state variables that it inherits from the Task class and also reports progress as it reads or writes dataThe code in Listing 27-13 creates an HttpRequest to read a PDF version of the Java Language Specification from Sun Microsystems website and a simple user interface that monitors that lets you see the progress that is reported It also reports the state of the started, stopped, succeeded, failed, and done variables on the consoleYou ll find this code in the file javafxdata/TaskExample1fx
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Listing 27-13
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Displaying the State of an HttpRequest Operation
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var r:HttpRequest = HttpRequest { location: "http://javasuncom/docs/books/jls/download/" "langspec-30pdf"; sink: new ByteArrayOutputStream() }; Stage { var scene:Scene; title : "Task Example #1" scene: scene = Scene { width: 350 height: 200 content: [ VBox { width: bind scenewidth height: bind sceneheight spacing: 16 vpos: VPosCENTER hpos: HPosCENTER nodeHPos: HPosCENTER content: [ Text { content: bind "Read {rprogress} of {rmaxProgress} "
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"({100 * rpercentDone}%)" } ProgressBar { progress: bind if (rpercentDone == -1) -0 else rpercentDone; } Text { wrappingWidth: bind scenewidth content: bind if (rstopped) "Stopped" else if (rsucceeded) "Complete" else rcauseOfFailuretoString() } Button { text: "Press to start" disable: bind rstarted action: function() { rstart(); } } Button { text: "Press to stop" disable: bind not rstarted or rdone action: function() { rstop(); } } ] } ] } } var started = bind rstarted on replace { println("started: {started}") }; var stopped = bind rstopped on replace { println("stopped: {stopped}") }; var succeeded = bind rsucceeded on replace { println("succeeded: {succeeded}") }; var failed = bind rfailed on replace { println("failed: {failed}") }; var done = bind rdone on replace { println("done: {done}") }; var causeOfFailure = bind rcauseOfFailure on replace { println("causeOfFailure: {causeOfFailure}");
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The result of running this code is shown in Figure 27-6
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Tasks and Progress Monitoring
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Figure 27-6
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Tracking the progress of a task
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The values of the progress, progressMax, and percentDone variables are shown in the Text node created on lines 20 to 24 of Listing 27-13You can see that the value of progressMax has been set to the total length of the PDF file, while the progress variable is being updated to reflect how much has been read so farThe percentDone value is automatically recalculated as the value of the progress variable changesWhen the application starts, these variables all have the value -1 The value of the percentDone variable is also reflected in the progress bar, which gives a visual representation of how much of the document remains to be read The two buttons that appear below the progress bar enable you to start and stop the operation by calling respectively the start() and stop() functions of the HttpRequest The start buttons is enabled only when the operation has not yet been started, while the stop button is enabled only while it is in progressThis is done by linking the disable variable of each button with the state variables of the HttpRequest Here s the expression that is used to determine the value for the disable variable of the start button is controlled:
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