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The WS-Secure Conversation specification allows Web services and clients to establish a token-based secure conversation for the duration of a session It is analogous to the SSL protocol that provides on-demand secure communications over the HTTP transport channel Secure conversations are essentially an efficiency mechanism to optimize the secure communication between a service and a client after the initial exchange of security credentials is over; this is known as the handshake Secure conversations reduce the need for frequent authentication between client and service In previous chapters, you saw how the WS-Security and WS-Policy family of specifications combine to provide a comprehensive approach to securing Web services Together these specifications provide an assortment of security options, including digital signatures, encryption algorithms, and custom authorization schemes We discussed these technologies in the context of protective security, meaning that they protect messages in transit and keep unwanted eyes from discovering sensitive information.

Although a BusinessListBase(Of T, C) is both a business object and an editable object, it is also a collection. It turns out that collections need one extra behavior beyond a simple editable object, so the IEditableCollection interface adds that extra method: Public Interface IEditableCollection Inherits IUndoableObject Sub RemoveChild(ByVal child As Core.BusinessBase) End Interface

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SQLite provides a way to defer collation registration until it is actually needed. So if you are not sure your application is going to need something like the length_first collation, you can use the sqlite3_collation_needed() function to defer registration to the last possible moment (perhaps as the result of some secret last-minute food renaming). You simply provide sqlite3_collation_needed() with a callback function, which SQLite can rely on to register unknown collation sequences as needed, given their name. This acts like a callback for a callback, so to speak. It s like saying to SQLite, Here, if you are ever asked to use a collation that you don t recognize, call this function, and it will register the unknown sequence; then you can continue your work. The sqlite3_collation_needed() function is declared as follows: int sqlite3_collation_needed( sqlite3* db, /* connection handle */ void* data, /* application data */ void(*crf)(void*,sqlite3*,int eTextRep,const char*) ); The crf argument (the collation registration function as we call it) points to the function that will register the unknown collation. For clarity, it is defined as follows: void crf( void* data, sqlite3* db, int eTextRep, const char*) /* /* /* /* application data */ database handle */ encoding */ collation name */

The RemoveChild() method will be important later in the chapter during the implementation of BusinessBase and BusinessListBase, and specifically for the implementation of the System. ComponentModel.IEditableObject interface. This interface has some tricky requirements for interaction between a child object in a collection and the collection itself.

This is certainly an important application of these technologies and it needs no further explanation But for the purpose of this chapter, we need to expand the context within which to view these technologies They are no longer needed just for protective security; in a broader context, they are needed for establishing trusted communications In the discussions so far, we have made the big assumption that the client and the Web service automatically trust each other By this, we mean the assumption that they both have an equivalent confidence in the integrity of the security tokens they are using to sign, encrypt, and otherwise secure their communications For example, if a client and a Web service agree to encrypt their messages using a digital X.

The db and data arguments of crf() are the values passed into the first and second arguments of sqlite3_collation_needed(), respectively.

In the same way that IBusinessObject provides a form of polymorphism and commonality across all business objects, IReadOnlyObject does the same thing for read-only business objects specifically those that inherit from ReadOnlyBase(Of T). It turns out that all read-only objects support a method for authorization: CanReadProperty(). This method is defined in the interface as follows: Public Interface IReadOnlyObject Inherits IBusinessObject Function CanReadProperty(ByVal propertyName As String) As Boolean End Interface The CanReadProperty() method is discussed in 12 when I discuss authorization.

Single-tier configurations are good for stand-alone environments, but they don t scale well. To support multiple users, it is common to use 2-tier configurations. I ve seen 2-tier configurations support more than 350 concurrent users against SQL Server with very acceptable performance.

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