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complete (flash.events.Event.COMPLETE): Dispatched when the data is decoded and assigned to the data property of the URLLoader object. This is a good time to start using the loaded resource. httpStatus (flash.events.HTTPStatusEvent.HTTP_STATUS): Dispatched if the load method invokes a call over HTTP. URLLoader is not restricted to making HTTP calls, although it s a popular choice. This event is triggered on an HTTP request, not a response, and it s triggered before the complete and error events. ioError (flash.events.IOErrorEvent.IO_ERROR): Dispatched if the request encounters a fatal I/O error and terminates the request. open (flash.events.Event.OPEN): Dispatched when the request starts on invocation of the load method. progress (flash.events.ProgressEvent.PROGRESS): Dispatched as the resource gets downloaded. This event is most relevant when the resource is large, say a huge image file, and it downloads incrementally. A progress event is fired on each chunk of bytes getting downloaded. securityError (flash.events.SecurityErrorEvent.SECURITY_ERROR): Dispatched if the security sandbox is violated.

public class LibrarianBuilder { public static Librarian create(String rootPath) throws InstantiationException { LibrarianSaveToFile.setRootPath(rootPath); return new LibrarianSaveToFile(new LibrarianSaveToStorage()); } } The Builder pattern is an extension of the Factory pattern. It is used to instantiate multiple instances of different types that are arranged in a specific configuration. In the case of our example class LibrarianBuilder, that would mean assigning the root directory by using the method setRootPath, instantiating LibrarianSaveToFile, instantiating LibrarianSaveToStorage, and wiring the two Librarian instances together. The returned Librarian instances would appear to the caller to be a single Librarian instance. However, when a Librarian method is called, two different instances are called.

Whereas the HTTPService class defines the following:

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

result (mx.rpc.events.ResultEvent.RESULT): Dispatched when the HTTP call returns. fault (mx.rpc.events.FaultEvent.FAULT): Dispatched if the call ends in an error. Interestingly, trying to access a binary resource, say an image file, using HTTPService also ends up in an error. invoke (mx.rpc.events.InvokeEvent.INVOKE): Dispatched when the call is initiated and no error has shown up yet.

The last step to implementing static HTTP validation is to put the entire solution together to build a web application. The following example uses Java servlets, but other implementations such as ASP.NET could have easily been used: public class LibrarianServlet extends HttpServlet { protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws javax.servlet.ServletException, java.io.IOException { EBVN if(req.getContentType().compareTo( "application/x-www-form-urlencoded") == 0) { String operation = req.getParameter("operation"); if(operation != null && operation.compareTo("addBook") == 0) { Librarian librarian = LibrarianBuilder.create( getServletContext().getInitParameter("generatepath")); try { Book book = new Book(); String isbn = req.getParameter("isbn"); if(isbn != null) { try { book = librarian.checkOutBook(isbn); } catch(Exception ex) { book.setISBN(isbn); } } String author = req.getParameter("author"); if(author != null) { book.setAuthor(author); }

Therefore, there is little event-driven control to monitor progress in HTTPService. The assumption is that fetching data is going to be quick and simple, so monitoring progress is not relevant. Error handling and HTTP status propagation is better and more fine-grained in URLLoader.

The HTTPService class is simply incapable of handling binary resources. Try out the following simple code, which attempts to download an image:

}, }, }, }, }, }, }, }, }, }, }, }, }, }, }, },

String title = reqgetParameter("title"); if(title != null) { booksetTitle(title); } respsetContentType("text/html"); PrintWriter out = respgetWriter(); librariancheckInBook(book); outprintln( ~ "<html><body>Did update</body></html>"); } catch(Exception ex) { throw new ServletException( "LibrarianServlet generated error", ex); } } } } } The servlet LibrarianServlet has implemented the method doPost, meaning that the servlet will react to only HTTP POST requests As per the Architecture section, when implementing the static HTTP validation, the servlet is used to only update data and not to retrieve data The servlet will process only those requests that post the content as being the type EBVN application/x-www-form-urlencoded Other data types could have been processed, but for the scope of this example only CGI-encoded data is supported It is important that the server check which content type is sent because the Permutations pattern calls for the server to be able to react to different types.

< xml version="1.0" encoding="utf-8" > <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768"> <fx:Script> <![CDATA[ import mx.controls.Image; import mx.controls.Alert; import mx.rpc.events.FaultEvent;

import mx.rpc.events.ResultEvent; import flash.utils.describeType; function faultHandler(event:FaultEvent):void { Alert.show('Oops there is a problem!....' + event.fault.faultString); } function resultHandler(event:ResultEvent):void { trace(describeType(event.result)); var img:Image = new Image(); var byteLoader:Loader=new Loader(); var byteArray:ByteArray=new ByteArray(); byteArray.writeUTFBytes(event.result as String); byteLoader.loadBytes(byteArray); var bitMap:Bitmap=Bitmap(byteLoader.content); img.source = bitMap; myVBox.addChild(img); Alert.show('It Works!....' + event.result); } ]]> </fx:Script> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> <mx:HTTPService id="myHTTPService" url="http://localhost:8080/ NBAScorers/treasury_of_ideas_logo.png" fault="faultHandler(event)" result="resultHandler(event)"/> </fx:Declarations> <s:SkinnableContainer> <s:layout> <s:VerticalLayout horizontalAlign="center" paddingLeft="40" paddingTop="40" /> </s:layout> <mx:VBox id="myVBox" width="100%" height="100%" /> <mx:Button label="Invoke HTTPService" click="myHTTPService.send()"/> </s:SkinnableContainer> </s:Application>