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Efficient Google Web Toolkit (GWT) Overview for Streamlined App Coding

The Google Web Toolkit (GWT) simplifies the app coding process with easy management of large apps and optimized JavaScript. It offers simple server-client communication, IDE debugging features, and supports history and localization. GWT enables the creation of client-server applications and provides browser-specific optimizations. The GWT Eclipse add-on and IDE implementation make debugging and testing easy. Code is deployed separately per user profile to reduce client download size. Other benefits include reusable UI components, code splitting, and browser history support.

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Efficient Google Web Toolkit (GWT) Overview for Streamlined App Coding

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  1. Matthew Keeney Google Web Toolkit

  2. Overview • Simplifies the App coding process • Easily manage Large Apps • Streamlined compiled code • Easy Debugging in an IDE

  3. Features • Simple server-client communication • Optimized Javascript • Reusable UI components • Mix premade JavaScript libraries and code with Java. • Easy History support • Easy Localization • JUnit testing

  4. Set-up • GWT Download • Gwt.google.com • Windows, OSX,Linux • Basic command line compiler • GWT Eclipse add-on • Easy IDE implementation • Updates automatically • Allows for debugging

  5. Server-Client Communication • Remote Procedure Calls • Clients ask for new data instead of new HTML pages • Create Client-Server applications instead of web pages • GWT protocol support • JSON • XMP • GWT RPC

  6. JavaScript Optimization • Browser specific Optimizations • Firefox 1.0, 1.5, 2.0 and 3.0 • Internet Explorer 6 and 7 • Safari 2 and 3 • Opera 9.0 • Chrome • Code is deployed separately per user profile • For example: separate code is compiled for “Firefox in English” or “IE in French” • Greatly Reduces client download size

  7. JavaScript Optimization • Universal Optimizations • Obfuscation • Inlining • String Interning

  8. Obfuscation example function(){varO=K.slice();for(var Q=0,P=arguments.length;Q<P;++Q){O.push(arguments[Q])}return N.apply(L,O)}

  9. Inlining example Shape s = new Circle(aRadius); widget.setText(“area: “ + s.getArea()); becomes: Circle s = new Circle(aRadius); widget.setText(“area: “ + s.getArea()); then becomes: Circle s = new Circle(aRadius); widget.element.textContent = “area: “ + (s.r * s.r * PI);

  10. String Interning Java: void assignStyles() { Style style = this.getElement().getStyle(); style.setProperty(“color”, “red”); style.setProperty(“border”, “1px solid black”); } JavaScript: var a = ‘color’, b = ‘red’, c = ‘border’, d = ‘1px solid black’; ... function assignStyles() { var style = this.element.style; style[a] = b; style[c] = d; }

  11. Non-JavaScript Optimizations • Content Bundles • Code Splitting

  12. Content Bundles • Combine JavaScript, CSS, images and any other static data into one bundle • Eliminates http requests • No need to download each file separately. • Reduces CSS size with the same techniques as JavaScript • Allows for Per-Browser CSS

  13. Bundle Example

  14. Code Splitting • Asynchronous Calls for new code • Send the user only what they are going to use initially then send further JavaScript when needed. • Users never download code they don’t use.

  15. Code Splitting Example

  16. Other Benefits to GWT • Reusable UI components • History support • IDE Debugging • JUnit Testing

  17. UI Components • http://gwt.google.com/samples/Showcase/Showcase.html

  18. History support • Reliably control the browser’s history • Provide feedback to the user • “Bookmarkable” • Uses url history tokens to “save” the state of the application

  19. IDE debug support • Hosted Mode – key to productive development • Java debugging • Fast edit refreshes • Improved for GWT 2.0 • Adds plug-in for all major browsers • Allows ide debugging on each browser not just the hosted mode browser.

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