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this by declaring an event of type ProgressChangedEventHandler (or a derivative thereof given support for variance in C# 40) and naming the event ProgressChanged This, however, would push the EAP class into the saving state To avoid this, developers could also pass a progress listener into the Async method Here are a couple of final points to note about Listing 1920 First, PiCalculation is an instance class rather than a static class Given that the implementation relies on coordinating between events and the initial Async member call, using an instance class lends toward a pattern in which the complexity associated with having multiple invocations and multiple listeners to the same events is avoided Without the instance approach, for example, it would be suboptimal (synchronization would be required at a minimum) to support a CancelAsync(object state) member because it would be necessary to look up the state associated invocation Even worse, progress change notifications (using the standard signature) would be impossible Second, PiCalculation is thread-safe since it doesn t store any state information If support for CancelAsync() or progress monitoring was added such that state was required, care should be taken to keep the thread-safe nature of the class

The decorator must also notify label listeners when the decoration for an element has changed In this case, whenever an element has been added to or removed from the Favorites view, notify listeners that the state of associated resources has changed This entails registering for change events from the FavoritesManager and then rebroadcasting those events to all registered ILabelProviderListener instances

Another pattern that provides operation status and the possibility of cancellation is the background worker pattern, a specific implementation of EAP The NET Framework 20 (or later) includes a BackgroundWorker class for programming this type of pattern Listing 1921 is an example of this pattern again calculating pi to the number of digits specified

using using using using System; SystemThreading; SystemComponentModel; SystemText;

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private final List<ILabelProviderListener> listenerList = new ArrayList<ILabelProviderListener>(); public FavoritesLightweightDecorator() { // Make sure that the Favorites are loaded managergetFavorites(); manageraddFavoritesManagerListener(this); } public void dispose() { managerremoveFavoritesManagerListener(this); } public void addListener(ILabelProviderListener listener) { if (!listenerListcontains(listener)) listenerListadd(listener); } public void removeListener(ILabelProviderListener listener) { listenerListremove(listener); } public void favoritesChanged(FavoritesManagerEvent event) { Collection<Object> elements = new HashSet<Object>(); addResourcesTo(eventgetItemsAdded(), elements); addResourcesTo(eEventgetItemsRemoved(), elements); LabelProviderChangedEvent labelEvent = new LabelProviderChangedEvent(this, elementstoArray()); Iterator<ILabelProviderListener> iter = listenerListiterator(); while (iterhasNext()) iternext()labelProviderChanged(labelEvent); } private void addResourcesTo( IFavoriteItem[] items, Collection<Object> elements) { for (int i = 0; i < itemslength; i++) { IFavoriteItem item = items[i]; Object res = itemgetAdapter(IResourceclass); if (res != null) elementsadd(res); } } public boolean isLabelProperty(Object element, String property) { return false; }

{ public static BackgroundWorker calculationWorker = new BackgroundWorker(); public static AutoResetEvent resetEvent = new AutoResetEvent(false); public static void Main() { int digitCount; ConsoleWrite( "Enter the number of digits to calculate:"); if (intTryParse(ConsoleReadLine(), out digitCount)) { ConsoleWriteLine("ENTER to cancel"); // C# 20 Syntax for registering delegates calculationWorkerDoWork += CalculatePi; // Register the ProgressChanged callback calculationWorkerProgressChanged += UpdateDisplayWithMoreDigits; calculationWorkerWorkerReportsProgress = true; // Register a callback for when the // calculation completes calculationWorkerRunWorkerCompleted += new RunWorkerCompletedEventHandler( Complete); calculationWorker WorkerSupportsCancellation = true; // Begin calculating pi for up to // digitCount digits calculationWorkerRunWorkerAsync( digitCount); ConsoleReadLine(); // If cancel is called after the calculation // has completed it doesn't matter calculationWorkerCancelAsync(); // Wait for Complete() to run resetEventWaitOne(); } else { ConsoleWriteLine( "The value entered is an invalid integer"); } }

When this behavior is in place, any elements added to the Favorites view will have a small F overlay and the suffix [favorite] in the Navigator view (see Figure 21 4)

With Java's fine grained access control, it is possible to configure security in even more detail You can define a security policy which accepts classes from a number of trusted codebases, but allows classes from each codebase a different set of permissions a different security profile Security management for RMI is discussed in 8

should be constant (the same value), even if the object s data changes In many cases, you should cache the method return to enforce this

If you simply want to decorate a label by adding a static image in one of the quadrants without any text modifications, then you can specify the icon attribute instead of the class attribute If the class attribute is not specified, Eclipse places the image specified by the icon attribute in the quadrant specified by the location attribute In this case, there is no need to create a class that implements ILightweightLabelDecorator because Eclipse provides this behavior for you A read-only file decorator is one example of a decorative label decorator

Required: GetHashCode() should not throw any exceptions; GetHashCode() must always successfully return a value Performance: Hash codes should be unique whenever possible How-

<decorator lightweight="true" location="BOTTOM_LEFT" label="Locked" icon="icons/locked_overlaygif" state="true" id="comqualityeclipsefavoriteslocked"> <description> Indicates whether a file is locked </description> <enablement> <and> <objectClass name="orgeclipsecoreresourcesIResource"/> <objectState name="readOnly" value="true"/> </and> </enablement> </decorator>

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