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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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out.println( "<URL>" + result.getURL() + "</URL>"); out.println( "<Title>" + result.getTitle() + "</Title>"); out.println( "<Snippet><![CDATA[" + result.getSnippet() + "]]></Snippet>"); out.println( "</result></results>"); } } return; } In the implementation of doGet, the first step is to retrieve the session by using getSession, which is then used to retrieve the AsynchronousParent instance by using getAttribute. The return value of getAttribute is assigned to an Object type because if the value of obj is null and a typecast is attempted, an exception will arise. If the value of obj is not null, it is possible to perform a typecast to AsynchronousParent. The cast value is assigned to parent, which retrieves a value by using the method getResult. If there is a result, the retrieved value will be non-null, allowing the appropriate XML content to be generated. Notice how the query identifier is assigned to an HTTP header, which the client will need to process. Based on the query identifier, the client would know whether the result is stale or to which query the result belongs. If the result is valid, it can be manipulated by the client and transformed to HTML or parsed to fill some HTML.
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E B V N Handling a Synchronous Search
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The other way of calling the REST-Based Model View Controller pattern implementation is to use the synchronous interface. A web browser, HTTP client, or even another REST-Based Model View Controller pattern implementation can call the synchronous interface. As the synchronous interface is a standard HTTP GET, the Permutations pattern is applicable. Implementing the Servlet-Based Permutations Pattern In the Permutations pattern, the example illustrated how to implement the pattern by using an HTTP filter or module. The Permutations pattern is implemented in the Java servlet or ASP.NET handler to reduce the number of redirections. However, when a Java servlet or ASP.NET handler implements the Permutations pattern, an object redirection (instead of a URL redirection or rewriting) occurs. The object redirection is illustrated in Figure 11-9. In Figure 11-9, the Handler class receives an HTTP request. In the implementation of the method doGet, the Permutations pattern is implemented. The URL along with the HTTP headers would be read in the doGet method. Like the original Permutations pattern, the acceptable types would be iterated for which a new URL could be rewritten or redirected to. In this implementation of the Permutations pattern, the acceptable types would be iterated and matched to an object instance that could process the acceptable type. The object instances implement the Representation interface. For Handler, there are two appropriate Representations: XML and HTML. The cross-referencing of the acceptable type and object instance is based on the getType method that returns the MIME type that it can process. The idea of the outlined architecture is to mimic a redirection infrastructure of Java Servlet or ASP.NET handlers.
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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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E B V N Figure 11-9. Object redirection architecture
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Implementing the architecture requires a servlet that manages the various representation implementations and reacts appropriately to an HTTP request. Following is the implementation of the class PermutationsServlet, with some parts missing for clarity: public abstract class PermutationsServlet extends HttpServlet { List _representations = new LinkedList(); public PermutationsServlet() { } protected Representation getRepresentationInternal( String mimetype, HttpServletRequest request) { Iterator repIter = _representations.iterator(); while( repIter.hasNext()) { Representation representation = (Representation)repIter.next(); if( representation.canProcess( mimetype, request)) { return representation; } } return null; }
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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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protected Representation getRepresentation(HttpServletRequest request) { ArrayList elements = parseHeaders( request.getHeader( "Accept")); Iterator iter = elements.iterator(); while( iter.hasNext()) { StringTokenizer tokenizer = new StringTokenizer( (String)iter.next(), ";"); Representation representation = getRepresentationInternal( tokenizer.nextToken(), request); if( representation != null) { return representation; } } return getRepresentationInternal( "*/*", request); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Representation representation = getRepresentation( request); if( representation != null) { representation.doGet( request, response); } return; } The data member _representations represents a list that contains all of the representations. PermutationsServlet implements the method doGet, which will be called whenever an HTTP GET request is received. In the doGet method implementation, getRepresentation is called, and that is the implementation of the Permutations pattern. The method getRepresentation is responsible for cross-referencing the acceptable types sent by the client, with a representation from the list of representations. In the implementation of getRepresentation, the Accept HTTP header is parsed for the individual MIME types that are acceptable by using the method parseHeaders. For better clarity, the method parseHeaders is not illustrated. To see an actual implementation, please see the Permutations pattern chapter. After the MIME types have been ordered, each value is iterated and attempted to be matched with a representation by using the method getRepresentationInternal. In the implementation of getRepresentationInternal, the method representation.canProcess is called. The canProcess method requires two parameters: the MIME type and HTTP request. It is important to realize that not only the MIME type determines whether a representation can process the request, but also the request parameters. If a match is made, getRepresentation will return immediately and stop iterating. If a match cannot be made, the catch-all MIME type (*/*) is queried for a representation. Getting back to the doGet implementation, if a representation is found, the method representation.doGet is called with the HTTP request and response types.
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