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value for the UsernameToken security token. When the service receives a request message, it can extract the nonce value from the security token and cache the value for the duration of the request message. These ID values are part of the message signature and cannot be spoofed. And because they are nonce values, it is highly unlikely that two request messages will coincidentally share the same ID values. However, this could happen if you choose to rely on the auto-generated ID value for the security token. Again, the burden remains on the service to cache information on incoming request messages. But if you need to take this approach, then a nonce value is the simplest way to do so. Listing 6-15 shows how the client can assign a nonce value to a UsernameToken security token.
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2. Click Enable running application out of the browser, as I have done in Figure 13-12.
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<WebMethod(Description="A sample method")> _ <SoapHeader("Credentials")> _ Public Sub SampleMethod() ' user credentials required. Security.Login(Credentials) ' Web method implementation code goes here End Sub Web methods that don t require authentication simply don t use the <SoapHeader()> attribute or call Security.Login(). Instead they call a different method, Security.UseAnonymous(): Public Sub UseAnonymous() ProjectTracker.Library.Security.PTPrincipal.Logout() End Sub Remember from 8 that PTPrincipal.Logout() sets the current principal value to an unauthenticated PTPrincipal. A remote data portal will only accept a principal object that inherits from Csla.Security.BusinessPrincipalBase, and so this code ensures that the current principal is such a principal object. With the authentication scheme covered, let s move on to discuss the implementation of actual web methods.
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his chapter will discuss, in detail, how to implement business objects based on the CSLA .NET framework. To a large degree, this chapter will tie together everything in the book so far; it will illustrate how to write code to create business objects, and make the most of the thought, design, and coding that s been covered. 8 will implement the objects for the sample application designed in 6. But before jumping headlong into implementing actual business objects, it is important to have a solid understanding of how to use each of the base classes provided by the framework implemented in s 3 through 5. This chapter will cover the life cycle of each type of business object in general terms. Then I ll get into code, creating a basic template showing the structure of each type of object: Editable root Editable child Editable, switchable (i.e., root or child) object Editable root collection Editable child collection Read-only object Read-only collection Command object Name/value list Though the templates are not complete business object implementations, each one illustrates the basic structure you need to follow when creating that type of business object. You can use this information to create class templates or code snippets for use in Visual Studio to make your development experience more productive.
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CHAPTER 6: Multiplatform Game Development: iPhone Games for Linux and Windows
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The preceding output indicates that no time was lost during the parse or execute calls, that the plan for the SQL statement was already present in the library cache, and that the SQL statement was optimized with the ALL_ROWS optimizer mode (indicating that Oracle attempted to optimize the SQL statement so that all rows of the SQL statement would be retrieved as quickly as possible, rather than optimizing so that just the first couple of rows would be retrieved as quickly as possible). The interesting statistics are present in the fetch line. The 739 rows were retrieved in eight fetches, indicating that the array fetch size was at least 93 rows. The client did not fetch a single row at a time, which might cause some of the long query execution time if the client were connected over a high-latency network connection (a satellite link with a 1000ms ping time would likely require approximately 14 minutes to transfer the rows, one row at a time). The elapsed time for the query is reported as 2,859 seconds, with
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ops$tkyte@ORA11GR2> alter table SYS_SQLLDR_X_EXT_DEPT 2 project column referenced 3 / Table altered. ops$tkyte@ORA11GR2> select dname 2 from SYS_SQLLDR_X_EXT_DEPT 3 /
the application if the user base changes). This concept of free or nearly free is important software engineering is already a challenging endeavor, and if making software cross-platform is difficult to implement, it requires either significantly more development time for a single code base, or a second code base for a different platform that replicates the functionality of the first (not to mention a third or fourth code base if other platforms must be supported). Without question, this means more time, more money, and more development resources are needed. Optimally, we want a relatively easy way to create cross-platform applications. Fortunately, a number of frameworks and platforms (including Microsoft Silverlight) have attempted to make the creation of cross-platform applications free or nearly free.
It s important to note that the more sophisticated applications were disconnected applications. Office productivity suites, desktop-publishing applications, games, and the like, were all distributed, installed, and run on the client via a fixed medium such as a floppy disk or CD. In other words, they weren t connected in any way. The other breed of application, which was evolving much more slowly, was the connected application, where a graphical front end wrapped a basic, text-based communication back end for online applications such as email. CompuServe was one of the largest online providers, and despite the innovative abstraction of its simple back end to make for a more user-centric, graphical experience along the lines of the heavy desktop applications, its underlying old-school model was still apparent. Remember the old Go commands Despite the buttons on the screen that allowed a user to enter communities, these simply issued a Go <communityname> command behind the scenes on your behalf. Although this approach was excellent and provided a rich online experience, it had to be written and maintained specifically for each platform, so for a multiplatform experience, the vendor had to write a client application for Windows, Unix, Apple, and all other operating systems and variants. But in the early 1990s, a huge innovation happened: the web browser. This innovation began the slow merger of these two application types (connected and disconnected) a merger that still continues today. We all know the web browser by now, and it is arguably the most ubiquitous application used on modern computers, displacing solitaire and the word processor for this storied achievement! But the web browser ultimately became much more than just a new means for abstracting the textual nature of the client/server network. It became an abstraction on top of the operating system on which applications could be written and executed (see Figure 1-5). This was, and is, important. As long as applications are written to the specification defined by that abstraction, they should be able to run anywhere without further intervention or installation on behalf of the application developer. Of course, the browser would have to be present on the system, but the value proposition of having a web browser available to the operating system was extremely important and ultimately launched many well-known legal battles. The problem, of course, with this abstraction was that it was relatively simple and not originally designed or implemented for anything more complex than laying out and formatting text and graphics. I am, of course, referring to Hypertext Markup Language (HTML). This specification, implemented by a browser, meant that simple text could be placed on a server, transferred from a server, interpreted by a browser, and laid out in a far more pleasing way than simple green-on-black on a page, giving the user a better experience. More important, however, it could generate a whole new breed of application developers; all a developer had to do for an online, connected application to have a graphical experience was to generate it as HTML, and the browser would do the rest. You wouldn t need the resources of a CompuServe or an America Online to build an application that rendered the text for you! All you had to do was generate HTML, either by coding it directly or writing a server-side application (in C) that would generate it for you. Although the Internet had been around for a long time, only at this point was it really being born.
Figure 11-3. The three forms of the catch clause The general catch clause can accept any exception, but can t determine the type of exception that caused it. This allows only general processing and cleanup for whatever exception might occur. The specific catch clause form takes the name of an exception class as a parameter. It matches exceptions of the specified class or exception classes derived from it. The specific catch clause with object form gives you the most information about the exception. It matches exceptions of the specified class, or exception classes derived from it. It also gives you an exception instance, called the exception variable, which is a reference to the exception object created by the CLR. You can access the exception variable s properties within the block of the catch clause to get specific information about the exception raised. For example, the following code handles exceptions of type IndexOutOfRangeException. When one occurs, a reference to the actual exception object is passed into the code with parameter name e. The three WriteLine statements each read a string field from the exception object. Exception type Exception variable catch ( IndexOutOfRangeException e ) { Accessing the exception variable Console.WriteLine( "Message: {0}", e.Message ); Console.WriteLine( "Source: {0}", e.Source ); Console.WriteLine( "Stack: {0}", e.StackTrace );
The following are some examples: bool bVal; bVal = (1 == 1) && (2 == 2); bVal = (1 == 1) && (1 == 2); bVal = (1 == 1) || (2 == 2); bVal = (1 == 1) || (1 == 2); bVal = (1 == 2) || (2 == 3); bVal = true; bVal = !bVal;
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