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The first and most important component of GWT is the Java-to-JavaScript compiler It takes your Java 15 code and produces distinct equivalent JavaScript versions that can be run on all supported browsers: At the time of writing, all versions of Safari and Firefox, Opera (at least up to versions 9x), and versions 6 to 8 of Internet Explorer Google Chrome, being based on the same layout engine (WebKit) as Safari, is also supported and runs Safari s code9 (Actually, the number of generated versions of the JavaScript code can be far larger, if your application uses i18n internationalization as we ll study in 12, Internationalization and Localization ) Code can be minimized for size, for faster downloads; there are also facilities for code splitting, which lets you download the required JavaScript code in smaller pieces, on a when-required basis; see 15, Deploying Your Application, for more on this The compiler does several code optimizing tasks during the compilation run, with the stated goal of producing high-quality code, ideally besting code developed by hand by experienced programmers (Usually, code is obfuscated, but you can also ask for Pretty or even Detailed output to better understand what the compiler does The desired option can be chosen when compiling, as we ll see in 15) Among the many optimizations applied, the following are most significant:10 Dead Code Elimination: Code that never gets called isn t included in the output file If you develop a class with ten methods, but only use a couple of them, the compiler won t generate code for the rest of them Similarly, if you inherit a module with several dozen methods, output code will be generated only for the actually required methods; you won t incur in any size penalty because of methods you don t need

Determines if an object is a String Determines if an object is an Array Determines if an object is a Function Determines if a reference is to an Object Determines if a reference is to something that behaves like an Array Determines if a reference is to a Function that does not properly identify itself as a Function Adds all the properties and methods from one object to another object Adds all the properties and methods from one object to the prototype of another object Assigns a specific scope to a function so that the function always executes with that scope Assigns no scope to a function to force the scope to default to the execution context when the function runs Makes a copy of an object with all its children Trims whitespace from the beginning and end of a string

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Contrary to the other apartment types, the TNA is only available for objects configured with COM+ Services STA and MTA apartments are also available for COM objects that are not registered as serviced components Similar to the other apartments, the COM object specifies that it wants to live in a TNA This is done with the registry entry ThreadingModel=Neutral The registry configuration ThreadingModel=Both means that the object can live either in an STA, MTA, or TNA Now the configuration Both means one of three This might sound silly; however, the reason for this name derives from the history when Both was really just one of two: STA or MTA The main difference from the TNA to the other apartments is that a thread never specifies to enter a TNA Instead, the thread enters the apartment during the method call and leaves it when the method call is finished This has a big performance advantage, because a thread switch does not occur for entering a TNA; just some variables for the apartment context are changed Saying that a thread lives either in an STA or an MTA, it is valid to say that a thread just visits a TNA What about thread-safe access to COM objects living in a TNA This is an important aspect with this apartment type: The synchronization feature moved out from the apartment to the COM+ activity With the help of an activity, it can be guaranteed that only one thread accesses an object within a TNA at the same time The difference from STA is that with single-threaded apartments, it is always the same thread accessing the object, but with TNA, it can be a different one

8 This in browser mode was, at least for a while, called OOPHM, standing for Out Of Process Hosted Mode 9 There are many other browsers (some for cell phones) that are also based on WebKit and thus could run GWT applications; check http://webkitorg/ for more details 10 See http://codegooglecom/p/google-web-toolkit/wiki/AdvancedCompilerOptimizations for planned future optimizations

dojoisString() dojoisArray() dojoisFunction() dojoisObject() dojoisArrayLike() dojoisAlien() dojomixin() dojoextend() dojohitch() dojopartial() dojoclone() dojotrim()

Nowadays, the STA model is only needed for objects that have a thread-affinity (for example, if a user interface element is accessed; window handles do have thread affinity) With COM+ Services or NET Enterprise Services, the preferred apartment type is TNA In case you are using serviced components directly on the client system as a library application where user interface elements are accessed, STA is the option to use

Now you have learned quite a lot about the history of COM apartments and are ready to step into the NET Enterprise Services-specific features

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