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Figure 2-3. Dependency inversion between an application and a nonfunctional API Figure 2-3 illustrates the direction of dependency in OOP and how this changes in AOP. The left side shows that, in OOP, the application uses and thus depends on the nonfunctional service. The situation is the same with procedural programming.

Developers at the University of Kansas wrote a text-based browser called Lynx in 1993 that became the standard for character terminals. A team in Oslo, Norway, in 1994 developed Opera, which was made widely available in 1996. In December 1994, Netscape released the 1.0 version of Mozilla, and the first for-profit browser was born. In 2002, an open-source version was released that grew into the popular Firefox browser, released in November 2004. When Microsoft released Windows 95, it included Internet Explorer 1.0 as part of its Microsoft Plus! pack. Despite its integration with the operating system, most people stuck with Netscape, Lynx, or Opera. Version 2.0 made significant strides by adding support for cookies, Secure Socket Layer (SSL), and other emerging standards. The second version was also available for the Macintosh, making it the first cross-platform browser from Microsoft. Still, most users stuck with what they were using. However, in the summer of 1996, Microsoft released version 3.0. Virtually overnight, people flocked to Internet Explorer. Of course, it didn t hurt that Netscape charged money for its browser and Microsoft offered Internet Explorer for free. The Internet community was polarized on the issue of browser dominance, as many feared Microsoft would do to the Web what it did to the desktop. Some were concerned about security, and sure enough, nine days after it was released, the first security problem was reported. By 1999 s release of Internet Explorer 5, it was the most widely used browser.

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The authors want to thank Phoebe Boswell for letting us use her student project The Girl With Stories In Her Hair in this exercise and her instructor, Birgitta Hosea, at Central Saint Martins College of Art and Design in London, UK, for introducing us to Phoebe. Phoebe did all of the work on this amazing video including the animation, writing, and narration. Every now and then we bump into students who make us stop in our tracks and say, Wow. Phoebe is one of those students.

The right side shows the situation in AOP. An aspect uses the nonfunctional service and integrates it into an application. Contrary to OOP, the application no longer depends on the service it is the aspect that depends on the application. This change in the direction of the links between the service and the application is not specific to AOP; it is sometimes the case for frameworks, as well. The principal advantage of this inversion is that it makes the work of the application developer easier. With AOP, the application developer does not need to worry about the nonfunctional services. It is the aspect developer who, in addition to writing the code of the service itself, manages the integration of that service into the application. The advantage is that the specialized aspect developer has a better understanding of the service than the application developer, who is only a user of this API. This lowers the risk of a service being used incorrectly. In particular, the aspect developer can make sure that the service integration is correct by implementing some constraints on the way the service can be used.