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public class Login extends BaseServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String userId = reqgetParameter("userId"); String password = reqgetParameter("password"); // handle direct navigation if (empty(userId) || empty(password)) { if (empty(getSessionCookie(req))) { reqgetRequestDispatcher("indexjsp")forward(req, resp); } else { // redirect for the logged in respsendRedirect("tasks"); } return; } // login try { TaskWorkspace workspace = applogIn(userId, password); setCookies(resp, workspacegetSessionId(), userId); respsendRedirect("tasks"); } catch (AuthenticationFailure af) { reqsetAttribute("message", "Invalid Credentials"); reqgetRequestDispatcher("indexjsp")forward(req, resp); } catch (Exception e) { eprintStackTrace(); reqsetAttribute("message", "Error: " + egetClass()getName()); reqgetRequestDispatcher("indexjsp")forward(req, resp); } } }

while (!flag( neighbor(ID))){ // wait to see if neighbor is done #pragma omp flush(flag) // required to see any changes to flag }

In addition to methods, the HttpResponse class defines integer static constants for each of the HTTP/11 status codes Table 10-5 lists these status codes and their values An example of a servlet that modifies response settings is offered below

import javaio*; import javaxservlet*; import javaxservlethttp*;

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The real purpose of this class is to authenticate users who are coming from the login JSP, and redirect them to the main part of the applicationThat happens in the lone method in this class, but not until the end; some other things need to be handled first It is possible that a user arrives at this URL from direct navigation, for whatever reason, and does not have a username and password in the request If this is the case, but a cookie has been set, they can be sent to the main application If the cookie is missing too, the only alternative is to send them to the logon page If we get past that part of the code, we know there is a username and password, so go ahead: Put the workspace to good use, and log inThe result of the login is the actual workspace object Because the password hash is stored right in the SimpleDB workspace

The flush operation in OpenMP only affects the thread visible variables for the calling thread If another thread writes a shared variable and forces it to be available to the other threads by using a flush, the thread reading the variable still needs to execute a flush to make sure it picks up the new value Hence, the body of the while loop must include a flush (flag) construct to make sure the thread sees any new values in the flag array As we mentioned earlier, knowing when a flush is needed and when it is not can be challenging In most cases, the flush is built into the synchronization construct But when the standard constructs aren't adequate and custom synchronization is required, placing memory fences in the right locations is essential

// 10, Listing 3 public class ResponseExample extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException { PrintWriter pw = new PrintWriter ( new BufferedWriter ( new OutputStreamWriter ( resgetOutputStream() ) ) ); StringBuffer buf=new StringBuffer(); bufappend("Output from servlet:\n"); bufappend("200 A-OK\n"); // Set status code to 200 OK ressetStatus(HttpServletResponseSC_OK); ressetContentType("text/plain"); ressetContentLength(buflength()); pwprint(buftoString()); pwflush(); } }

Java does not provide an explicit flush construct as in OpenMP In fact, the Java memory model[3] is not defined in terms of flush operations, but in terms of constraints on visibility and ordering with respect to locking operations The details are complicated, but the general idea is not: Suppose thread 1 performs some operations while holding lock L and then releases the lock, and then thread 2 acquires lock L The rule is that all writes that occurred in thread 1 before thread 1 released the lock are visible in thread 2 after it acquires the lock Further, when a thread is started by invoking its start method, the started thread sees all writes visible to the caller at the call point Similarly, when a thread calls join, the caller will see all writes performed by the terminating thread

item, it is convenient to return it from the login so we can prepare and store the authentication cookie Listing 12-6 shows the indexjsp page that collects that login data in the first place

After compiling and installing RequestDisplay in your preferred servlet engine, or servletrunner for testing purposes, you'll see that output of this servlet is actually rendered as text by your browser instead of HTML This is because the MIME content type was modified to accommodate text/plain, instead of text/html output We could just as easily have modified the response code from 200 to something more exotic, such as the more advanced HTTP/11 codes available; however, few browsers support the entire range of status codes

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