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Flexibility and extensibility Shortsighted is the architect who believes he can predict the future requirements placed on his or her system. The migration path from a closed e-commerce site to an integrated supply chain is far shorter in the business world than it is in the technical one. A key design goal for all distributed systems is to maximize system flexibility and make extending functionality as painless as possible. Unfortunately, it is difficult to mandate the ways in which this is accomplished. One way to face this challenge is to do a good object-oriented analysis of your functional requirements. Study each requirement intently and try to abstract it into a more general class of problem. Then, by building functionality that addresses the more general class of problem, your system will be better prepared to handle modifications and extensions to its capabilities in the future. When functionality needs to be changed or extended, you will be able to reuse existing components rather than building from scratch. For example, just because your company repairs vacuum cleaners does not mean that you build a vacuum cleaner tracking system. You build a workflow engine that can track the states of things, send notifications, and route messages. Then you apply your engine to the task of tracking vacuum cleaner repair jobs. And next month, when your company expands into toasters and microwave ovens, you go on vacation to reflect on your genius. This book discusses numerous strategies you can implement with J2EE and XML to generalize your system and maximize its flexibility. In chapter 3, we take a general approach to creating interfaces between components. In chapter 4, we discuss general mechanisms for integrating your application with its

You should never give IUSR_machinename any more permissions than the default ones. If, for example, you add IUSR_machinename to the Administrators group, you may be able to fix security problems and perform certain tasks, but doing so compromises the security of your web server.

The XAttribute class represents the attributes of an element within an XML document. The Attribute method returns the value of the attribute whose name is specified as its argument.

if (theNote is ICompressible) { ICompressible myCompressible = theNote as ICompressible; myCompressible.Compress( ); } else { Console.WriteLine("This storable object is not compressible."); }

for ( i=0; i<kMaxArraySize; i++ ) { *c = 0; c++; }

In general, the design of an extender follows three phases:

Query sqlQuery = session.createSQLQuery("select {u.*} from USERS {u}") .addEntity("u", User.class); sqlQuery.setFirstResult(40); sqlQuery.setMaxResults(20);

-(void)emitButtonDown { particles.emit = YES; }

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Note that the RSS feed uses several XML namespaces: http://purl.org/dc/elements/1.1/, http://purl.org/rss/1.09/modules/slash/, and http://wellformedweb.org/commentapi/. Listing 9.6 shows the code for using the DOM to select values out of elements that use a namespace prefix for the aforementioned namespaces.

Figure 1.8 Code scattering caused by the need to place nearly identical code blocks in multiple modules to implement a functionality. In this banking system, many modules in the system must embed the code to ensure that only authorized users access the services.

public String toString() { StringBuffer buffer = new StringBuffer(); buffer.append(getClass().getName()) .append("@") .append( Integer.toHexString(hashCode()) ) .append(" ["); .append("text").append("='").append(getText()).append("' "); .append("]"); return buffer.toString(); }

Listing 12.9 Domain-specific implementations of Where and Select (DomainSpecificOperators.cs)

Once you have saved Ein1Controller, select N to open a new window in your Classes folder to open up the New File dialog window. Select the Cocoa Touch icon in the

Listing 8.9 GalleryView.fx (part 2)

if (modeLock!=lockToRotation) { float scale = pinch/lastPinch; CGRect bounds = self.bounds; bounds.size.width *= scale; bounds.size.height *= scale; self.bounds = bounds; }

Now let s build a Silverlight web search application that uses Yahoo s Search API to search the internet.

The two RGB functions allow you to set a color using values from 0 to 1 for each of red, green, blue, and alpha transparency (opacity). We saw an example of this in listing 19.2:

Public Class SingleOrDefaultExample Private Shared Function singleFunc(ByVal n As Integer) As Boolean Return (n > 9) End Function

Once the upload mode and schedules are defined for each collection set, SQL Server Agent jobs are used to execute the collection and upload to the MDW. For a cached mode collection set, two agent jobs will be used: one for the collection and another

result = original++;

OK, now you can run the test. To do this you just need to build the project (press use Build Build, though you can choose Build and Run if you prefer.

Let s pick up where we left off on our order processing system. We built the OrderRequestSender, picked the best message type, and then dialed in the right amount of reliability. It s high time we designed the consumer of OrderRequest messages. We could choose to create the consumer as a stand-alone JMS client. However, we want to scale our application to handle many OrderRequest messages concurrently. So, in the spirit of this book, and because we already have an investment in an EJB server, we ll design the message consumer as a message-driven bean (MDB).

Interestingly enough, if neither the _bitmap nor the _invalidImageBitmap variables has been initialized, then this comparison will generate both Bitmap objects in order to compare them This handles any possible exception our code might encounter when creating a bitmap from a given file name One other subtle but very important change we need to make is how Photograph objects are compared We will take this up next 542 OVERRIDING METHODS IN THE OBJECT CLASS As we have repeatedly indicated, all classes in C# implicitly inherit from the object class, which is the same as SystemObject class In this section we look at the Object class in some detail, and override some of the methods inherited from this class in our Photograph class You may wonder why there is both an object and an Object, and the answer is both simple and confusing.

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