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<Rectangle Height="50" Width="50" Fill="Crimson"> <Rectangle.RenderTransform> <RotateTransform CenterX="0" CenterY="0" Angle="45"/> </Rectangle.RenderTransform> </Rectangle> Since our center point is at (0,0), the rotation is done around the top-left corner of the rectangle. If you want to rotate the rectangle around its true center, make sure you set CenterX and CenterY appropriately. In this case, we d set the center to the point (25,25). From left to right, Figure 9-8 shows what our rectangle looks like normally, rotated by 45 degrees around its top-left corner, (0,0), and rotated 45 degrees around its true center, (25,25).
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Next to triangles, you can also render lines and points. This involves using the same code; you specify only a different type of primitive. Simply store a vertex for each point you want to render in an array. If you have stored 12 vertices in an array as shown earlier, this is how you render the 12 3D points to the screen: device.DrawUserPrimitives<VertexPositionColor> (PrimitiveType.PointList, vertices, 0, 12); Note that each point will occupy exactly one pixel on your screen, no matter how close/far the camera is from the point. Anyway, you ll need a couple of good eyes to see the pixels.
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every five hours will likely be problematic. That s almost fifteen minutes per day. This measure doesn t usually include planned downtime, for backups and routine maintenance, for example. On the other hand, some environments don t need to be highly available. In many environments, as long as an application is available during business hours, folks are happy. However, as applications become more connected, more global, and more automated, requirements for availability will increase. Failure is inevitable. Hardware fails. Disk drives crash. Networks go down. Accepting this is a given; you provide for availability by adding redundancy to the system. You must add redundancy at each point of failure. Having redundancy at every point of failure is frequently called n+1 reliability. N is a measure of the amount of resources needed to do the job. The plus one provides the availability when failure occurs. Given n+1 reliability isn t cheap; it s only put in place for mission-critical applications. If a company s entire revenue stream is web based, an unavailable website means zero dollars in the revenue stream. Suddenly the expense of n+1 reliability doesn t seem like so much money, after all. ISPs that host the big websites typically have four T4 lines running to the building, one from each direction on the compass. They may have several diesel generators in case the power fails, and then in case a generator (or two) fails. They may also be fortified, to guard against sabotage, like a bank. The company adds capacity for the servers automatically when a spike in traffic occurs. All of this redundancy allows them to guarantee the sites they host will be available. Availability of static pieces of the system can be attained by scaling out, which is a fancy term for throwing more servers at the problem. Since one web server can go down, another is added to the mix, and a load balancer is put in front of them. A single IP now maps to more than one machine. Failover is provided by the load balancer, which will send all traffic to the live machine when one dies. If these machines are not physically colocated, some type of persistent connection needs to be maintained between them. This can be a factor when a failover strategy also needs to account for a disaster recovery scenario. These requirements and the decisions made to meet them can affect the design of the software systems that will be hosted on this physical infrastructure. The introduction of a load balancer means anything stored in the memory of the web server can be in the memory of more than one physical machine. This may be fine for read-only information, where more than one copy is acceptable. But for mutable, or user-specific, information, this situation introduces a definite problem. The web server s memory becomes an unsuitable location to store this information. It must be marshaled out-of-process, and stored in a central location. Failure to account for this means failure of the application when a web server blows a gasket. This problem is accounted for with out-of-process session state available in ASP .NET. State information can be stored either in an out-of-process state server (no redundancy), or SQL Server, which can be made redundant with clustering. This introduces a definite performance hit, but architecture is frequently about trade-offs. You must find a balance. Maybe this hit is not acceptable, and the application will be designed not to use session information at all. It depends. Clustering will actually need to be present in a highly available system, regardless of how session state is being dealt with. Scaling out will not work on the database tier of the application for the same reason it doesn t work with user-specific session information. It changes. There can t be n copies of it, because these copies would start to deviate from one another. Clustering maintains a hot backup of a single server and a mirrored copy of the information written to disk that the system is dependent upon. Drive crashes Switch over to the mirror. Server crashes Switch to the backup. This is also called scaling up. We can scale out at the
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The final data portal method is DataPortal_Delete(). This method is called from two possible sources if immediate deletion is used, the UI will call the static deletion method, which will call DataPortal_Delete(); and if deferred deletion is used, then DataPortal_Delete() is called by DataPortal_DeleteSelf(). A Criteria object is passed as a parameter, identifying the data to be deleted. Then it s just a matter of calling the deleteProject stored procedure as follows: [Transactional(TransactionalTypes.TransactionScope)] private void DataPortal_Delete(Criteria criteria) { using (SqlConnection cn = new SqlConnection(Database.PTrackerConnection)) { cn.Open(); using (SqlCommand cm = cn.CreateCommand()) { cm.CommandType = CommandType.StoredProcedure; cm.CommandText = "deleteProject"; cm.Parameters.AddWithValue("@id", criteria.Id); cm.ExecuteNonQuery(); } } } The method just opens a database connection, configures a SqlCommand object to call the deleteProject stored procedure, and executes the command. In the downloaded code, you ll also see a code region for an Exists command, which I ll discuss later in the chapter.
The IDC file contains two important sets of information: Class definitions for all custom types that are exchanged by the Web service Abstract class definitions for each operation that the Web service supports Listing 3-4 provides the code for an IDC file for the RequestQuote operation and its associated types.
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