![]() Because everything involved are strongly typed Java objects, everything is enforced at compile time. ![]() And, of course, it has to be represented as a strongly typed object in Java that requires all of the dynamic data (like "Raymond" and "4" above) to be supplied in order for it to be used. The contract is then implemented in each language supported by a particular application/page/component. There may also be multiple variations for gender and cardinality. For example, a particular unit may need an integer and a string in English (like "Raymond has 4 cars"), but requires two integers and a string in another language. Contracts define what kind of data is needed to create any variation of a piece (unit) of content. The choice of the word contract is intentional. ![]() It uses its own XML-based language to create content contracts. What about the hardest problem of them all: content? V4's content system is unique and powerful. Instead, the actual HTML DOM is represented in the Java language, so you can wire together CSS and JavaScript on the server. V4 does not use servlets or JSPs to create HTML. The same can also be said for links, CSS, and JavaScript. If you want to delete that image, it's as simple or as complex as deleting any other Java class. Does your page use an image? Then there is a Java object for that image. The first article describes the evolution of eBay's presentation architecture from its early Perl roots to the current Java version, known as version 4: "The V4 architecture took the approach of representing everything that was going to be used on the front end with strongly typed Java objects on the back end. ![]() Java ebay watcher code#EBay insider Michael Galpin has written a two part article on IBM's Developer Works site describing eBay's extensive use of Eclipse plug-ins and code generators to improve the developer experience and code quality. ![]()
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