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Download Accelerated GWT : building Enterprise Google Web Toolkit by Vipul Gupta PDF

By Vipul Gupta

The Google net Toolkit (GWT) is a key member of Google's well known array of software program improvement ideas, and is well the preferred Ajax framework answer for Java builders. sped up Google internet Toolkit bargains a quick paced but thorough advent to GWT, supplying severe builders not just key insights into the framework's functions, but in addition into how readers can so much successfully contain GWT into their day-by-day improvement routine.

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Type, String, Throwable) Used to branch a new logger under the current logger. The messages that are logged using the branch logger get grouped together under the parent logger. Type is an enum listing the various logging levels that can be used to differentiate the various logged messages. The various types in the enum are DEBUG, ERROR, INFO, SPAM, TRACE, WARN, and ALL. typeinfo package is used to get the information (including metadata information such as comments in the documentation of the class/interface/methods) related to a specific type from a set of source files.

Since the same origin policy does not allow JavaScript to access resources from a different domain, all the files for the GWT application must reside on the same web server. Another important implication is related to making RPC calls (which are explained in Chapter 4). The same origin policy restricts the XMLHttpRequest object to making requests outside the domain from which the page was loaded. Therefore, your GWT application cannot make requests for data to domains different from the one from which the page containing the code was originally loaded.

The GWT compiler performs various code optimization tasks during the compilation process. The following are the most important ones: Dead code elimination: Only classes and those methods that are used in the application are translated into JavaScript. For example, say a type X has five methods and only one of these methods is ever called in the application code. The GWT compiler will remove the four methods when converting the code to its JavaScript equivalent. Method calls inlining: A method call is replaced by the actual code of the method being called.

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