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We should note that this performance issue is completely insignificant for most real-world applications, where the complexity of the aspects and the business layer make the overhead insignificant in comparison For instance, the generic retry aspect presented earlier creates an insignificant overhead in comparison to the remote call, which is done to invoke the facade s service For an optimal aspect-oriented design, both typed and generic AOP techniques should be used in a judicious way, so that the advantages of each can be realized when possible..

like to mention a third approach to selecting and moving them as a unit. Marquee the object, and select Modify Group. Now, when you click the object, it is regarded as a single entity and can be dragged at will. You can use the Selection tool for more than simply dragging objects around the stage. You can also use it to modify the shape of an object. The square on the stage, as you know, is composed of two vector objects a stroke and a fill. This means not only can they be moved around the stage, but they also be reshaped and still retain their crisp strokes and fills.

the tip of the mouse pointer on one of the strokes around the square. Do you see the little quarter circle, as in Figure 2-5, below the arrow That symbol indicates you can reshape the stroke.

HTML Validator1 is a Firefox extension that finds and flags errors on an HTML page. HTML Validator is based on Tidy, a tool originally developed by the W3C to validate HTML code. HTML Validator embeds the Tidy tool into Firefox and allows the source code of a page to be validated locally within the browser without sending the code off to a third party. Tidy finds HTML errors and classifies them into three categories: Errors: Problems that Tidy cannot fix or understand Warnings: Errors that Tidy can fix automatically Accessibility warnings: HTML warnings for the three priority levels defined by the W3C Web Accessibility Initiative (WAI) HTML Validator displays the status of the page and the number of errors in the lower-right corner of the browser, providing fast feedback during the development cycle (see Figure 5-2). HTML Validator provides even more help when you view the source of a Web page by accessing the View Page Source menu item. The Firefox view-source window opens as normal, but with HTML Validator enabled, the window includes two new panes (see Figure 5-3). The HTML Errors and Warnings pane lists all the errors found on the page. Clicking any of the items in the list jumps the main source Figure 5-2. HTML Validator window to the location of the problem in the HTML source. summarizes the errors on The Help pane fully describes the problem and offers suga page using an icon on gestions on how you can fix the problem. the status bar.

stroke is anchored, and, as in Illustrator CS5 or Fireworks CS5, if you drag a point on a line between two anchor points, the line changes its shape. The stroke uses the location of the point where you released the mouse as the apex of the curve. The other thing you may have noticed is, as shown in Figure 2-6, the fill also updates to reflect the new shape.

8. Select the Subselection tool, or press the A key to switch to this tool. Double-click one of the

The ultimate goal of AOP is to provide better separation of concerns This goal is reached with aspects since they allow the modularization of concerns that are not clearly modularized using regular programming techniques However, with the separation of concerns into different modules, another kind of dependency appears when different modules are integrated This dependency, which we can refer to as association coupling, is particularly important when using statically typed AOP For instance, with the statically typed retry aspect, a change in the method signature captured by the pointcut invalidates this pointcut definition, as well as the associated advice codes Any evolution of the application can then become tedious in the long run It is a paradox in the sense that separation of concerns makes the application more understandable and, at the same time, more difficult to maintain This is the separation of concerns paradox.

corner points for the curve you have just created. The points and the handles, as shown in Figure 2-7, become visible. You can further adjust the curve by moving either the handles or the points. These handles are available only on curves.

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