Simple .NET/ASP.NET PDF document editor web control SDK

The proxy class is generated at runtime rather than being directly configured as with most of the Spring beans you have used so far. Although the bean is not something you will normally interact with directly, it does become visible under certain circumstances. First, you will encounter it when working with your classes under an interactive debugger. Method calls that would otherwise call directly into your service implementation will first disappear into the runtime proxy. The other place you will encounter these generated proxy classes is when looking through the stack trace of thrown exceptions. Listing 5-9 shows some excerpts from a stack trace generated when an error occurs in the timesheet service implementation s transactional createTimesheet method. If no other classes were involved, the onSubmit method would call directly into the createTimesheet method, but because there are, the proxy object is clearly visible along with some additional lines.

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Using any color other than white in this last parameter draws the image with a composition of its original colors and color tone.

com.apress...TimesheetServiceImpl.createTimesheet(...) ... $Proxy64.createTimesheet(...) com.apress...TimesheetCreateController.onSubmit(...) ... Note that you can end up with multiple AOP proxies around the same target class in some circumstances, so you may see entries similar to Listing 5-9 appearing multiple times within the same call stack. The additional elided lines between the proxied createTimesheet method and our createTimesheet implementation in Listing 5-9 are merely method calls in the reflection API used by the proxy to invoke the service.

XNA 3.0 SpriteBatch.Draw method (http://msdn.microsoft.com/en-us/library/microsoft. xna.framework.graphics.spritebatch.draw.aspx). For example, If you want to rotate your image, look for the overloads that expect the rotation parameter, or use the SpriteEffects parameter, if you just want to flip the sprite horizontally or vertically. Overloads with a scale parameter allow you to change the size of the sprite, which can be used in many ways, such as to create a zoom effect.

Now let s adjust the Game1 class. A new Windows Game project already creates a SpriteBatch object for you, so you ll start by creating a clsSprite object in the Game1 class. Include this definition at the beginning of the class, just after the device and SpriteBatch objects that were automatically created for you. You ll see something like the next code fragment: public class Game1 : Microsoft.Xna.Framework.Game { GraphicsDeviceManager graphics; // The device SpriteBatch spriteBatch; // The sprite renderer clsSprite mySprite1; // My sprite class

You may have noted that I have described the transaction as rolling back for unchecked exceptions only. Checked exceptions will not automatically cause a rollback, but the annotation can be parameterized to require this.

Obviously, you need to create these objects with valid values before using them. You do so in the LoadContent method, which is where you include graphics initialization (as discussed in the previous chapter). Because the project already creates the SpriteBatch object, all you need to do is create the clsSprite object: protected override void LoadContent() { // Load a 2D texture sprite mySprite1 = new clsSprite(Content.Load<Texture2D>("ball"), new Vector2(0f, 0f), new Vector2(64f, 64f)); // Create a new SpriteBatch, which can be used to draw textures spriteBatch = new SpriteBatch(GraphicsDevice); }

Caution The exception does not have to leave the boundary of the service class itself for the transaction logic to apply. A service method that throws a runtime exception will cause a rollback even if the calling method was within the same service class and caught and quashed the transaction.

Note The previous code sample uses Vector2(0f, 0f) to define a zeroed 2D vector, but you could use

There are other details of the transaction that can be configured, such as its isolation level and a fixed time-out period after which the transaction will be deemed to have failed. Table 5-1 shows the various properties that can be used to configure these details.

the Vector2.Zero static property as well. The XNA Framework offers such properties to improve the code s readability.

Isolation (enum)