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public void init(javax.servlet.ServletConfig config) throws javax.servlet.ServletException { _baseDirectory = config.getInitParameter("base-url"); try { _userIdentification = (UserIdentificationResolver)ServerPush.class. getClassLoader().loadClass( config.getInitParameter("user-identification")).newInstance(); } catch (Exception e) { throw new ServletException( "Could not instantiate _userIdentification", e); } } protected void service( javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException { } protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws javax.servlet.ServletException, java.io.IOException { // Do something with the URL } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } } Looking at the code, you can see that scattered throughout are pieces of bolded new functionality. With respect to data members, the array list _users is newly added. The array list specifies the state of each individual user. In a real-life application, this is not what you would probably do because there could be literally thousands of users. In real-life, though, you would associate the user identifier with a key. The user identifier is the trailing end of the resource URL, and need not be a username but could be an alphanumeric number or sequence of characters. The other new data member is _baseDirectory, which represents the root resource URL. A root resource definition URL is needed because the servlet has to be able to distinguish between a generic URL (/ajax/chap06/serverpush) and a specific URL (/ajax/chap06/serverpush/ username). The data member _baseDirectory is assigned in the init method implementation and represents a reference point for all URLs that will be processed by ServerPush. The modified service method is implemented as follows:
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protected void service( javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException { String user = request.getRequestURI().substring( _baseDirectory.length()); if(user.length() == 0) { UserIdentification userid = _userIdentification.identifyUser(request); if(userid.isIdentified()) { response.sendRedirect(request.getRequestURI() + "/" + userid.getIdentifier()); return; } else { response.setStatus(500, "User could not be identified"); return; } } super.service(request, response); } The new bolded code in the service method illustrates the extraction of the user identifier from the called URL that is assigned the user variable. If the user variable has no length, the root resource URL has been called and therefore a redirect is appropriate. In Java servletspeak, a redirection is performed by using the method sendRedirect, which results in an HTTP 302 code being generated. If no redirection is made, a specific URL is being requested and hence processing can continue as usual. The modified implementation of the method doPost is as follows: protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws javax.servlet.ServletException, java.io.IOException // Do something with the URL }
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What is new in the implementation of the method doPost is that there is no implementation. This is because the implementation of doPost is completely specific to the application. In the case of the server push, it means receiving data on the writing stream that is used to update a specific resource. In the case of the example, that means processing the sent data and assigning it to the UserState object instance.
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As a side note, remember that the HTTP server handles authentication. Therefore, if the methods doGet, doPost, and so on are reached, the programmer can be assured that the user has been authenticated and allowed access to that URL. Most web servers, such as Apache and Tomcat, allow a great deal of fine-tuning of the authentication. If that is not enough, or your HTTP server does not support such fine-tuning, you will need to write an authentication filter. The authentication code should under no circumstances be added to the ServerCommunicator. The modified implementation of doGet is as follows: private int getSentVersion(HttpServletRequest request, String user) { Cookie[] cookies = request.getCookies(); String cookieIdentifier = "VersionId" + user; if(cookies != null) { for(int c1 = 0; c1 < cookies.length; c1 ++) { if(cookies[ c1].getName().compareTo( cookieIdentifier) == 0) { return Integer.parseInt(cookies[cl].getValue()) } } } return 0; } private UserState getUser(String user) { EBVN Iterator iter = _users.iterator(); while(iter.hasNext()) { UserState userstate = (UserState)iter.next(); if(userstate.getUserIdentifier().compareTo(user) == 0) { return userstate; } } return null; } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { UserState userstate = getUser( request.getRequestURI().substring( _baseDirectory.length())); if(userstate != null) { int sentVersion = getSentVersion( request, userstate.getUserIdentifier()); int waitCount = 0; while(waitCount < 10) { if(sentVersion < userstate.getVersion()) { PrintWriter out = response.getWriter(); out.println("User (" + userstate.toString() + ")");
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