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Java is one of the first languages where an attempt was made to specify its memory model precisely The original specification has been criticized for imprecision as well as for not supporting certain synchronization idioms while at the same time disallowing some reasonable compiler optimizations A new specification for Java 2 15 is described in [JSRa] In this book, we assume the new specification Java allows variables to be declared as volatile When a variable is marked volatile, all writes to the variable are guaranteed to be immediately visible, and all reads are guaranteed to obtain the last value written Thus, the compiler takes care of memory synchronization issues for volatiles[4] In a Java version of a program containing the fragment (where done is expected to be set by another thread)

As a servlet developer, you can take advantage of the ability to specify configuration parameters This makes your software more flexible and eliminates the need to hardwire specific parameters into your code An example of this could be the username and password for a database connection, or the filepath to a local directory where data is stored To allow access to these parameters, you need to obtain a reference to the ServletConfig instance that is associated with your servlet This can be done by using the following code:

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<%@ page pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://javasuncom/jsp/jstl/core"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 401 Transitional//EN" "http://wwww3org/TR/html4/loosedtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Login to Task List</title> </head> <body> <form action="login" method="post" name="Login"> <div><c:if test="${not empty requestScopemessage}"> <div><c:out value="${requestScopemessage}" /></div> </c:if> <div>Username <input type="text" name="userId" size="14" maxlength="20" /></div> <div>Password <input type="password" name="password" size="14" maxlength="32" /></div> <div><input type="submit" name="Login" title="Login" value="Login" /></div> </div> </form> </body> </html>

From the point of view of the rule stated previously, reading a volatile variable is defined to have the same effect with regard to memory synchronization as acquiring a lock associated with the variable, whereas writing has the same effect as releasing a lock

ServletConfig sconf = thisgetServletConfig();

There is not much special going on here, other than a simple HTML formAt the top of the form, a message is conditionally written into the outputWhen present, this is the error message you may have noticed being set in the first catch block of Listing 12-5, surrounding the appearance of an AuthenticationFailure

while (!done) {/*do something but don't change done*/}

Once this reference is obtained, you have access to the parameters by calling the getInitParameter method and specifying a parameter name In cases in which you do not know the names of the parameters, you can call getInitParameterNames( ), which returns an enumeration of available parameters The following code prints the names of parameters out to a servlet's output stream:

public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException {

Logging out of the application is a simple matter, as shown in Listing 12-7The browser cookie is deleted, the client is redirected to the logon page, and an attempt is made to clear the sessionId stored in the SimpleDB workspace item

we would mark done to be volatile when the variable is declared, as follows, and then ignore memory synchronization issues related to this variable in the rest of the program

ServletConfig sconf = thisgetServletConfig(); OutputStream out = resgetOutputStream(); PrintWriter pw = new PrintWriter ( new BufferedWriter ( new OutputStreamWriter ( out ) ) );

volatile boolean done = false;

package comsimpledbbookservlet; import javaioIOException; import javaxservletServletException; import javaxservlethttp*; import comsimpledbbooktasklistAuthenticationFailure; public class Logout extends BaseServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { deleteSessionCookie(response); responsesendRedirect("/"); try { applogOut(getUserCookie(request), getSessionCookie(request)); } catch (AuthenticationFailure af) { } // ignore } }

pwprintln ("<html><body><pre>"); for(Enumeration enum = sconfgetInitParameterNames(); enumhasMoreElements();) { pwprintln(enumnextElement()); } pwprintln ("</pre></body></html>"); pwflush(); pwclose(); }

Because the volatile keyword can be applied only to references to an array and not to the individual elements, the javautil concurrent atomic package introduced in Java 2 15 adds a notion of atomic arrays where the individual elements are accessed with volatile semantics For example, in a Java version of the OpenMP example shown in Fig 62, we would declare the flag array to be of type AtomicIntegerArray and update and read with that class's set and get methods Another technique for ensuring proper memory synchronization is synchronized blocks A synchronized block appears as follows:

Another important class is the ServletContext This class allows access to servlets that can pose a potential security risk but at times may be necessary, and offers other useful functions Sun provides a convenient way to access this context, through the getServletContext(), as shown below:

Now we come to the heart of the user interface: the code that fetches the tasks in Listing 12-8The first thing that happens in the doGet() method is a check to verify that the session cookie is setAll that really remains after that is to pull today s tasks and set them in the request object where the JSP page can pick them up

synchronized(some_object){/*do something with shared variables*/}

ServletContext scont = thisgetServletContext();

package comsimpledbbookservlet; import javaioIOException; import javautilList;

The ServletContext provides a variety of information that is useful for debugging (such as logging an error condition to a server log), as well as for diagnostic purposes These methods are shown in Table 10-6 The logging methods allow entries to be made in the server-wide servlet log file You can provide a simple message, or a message with an exception, such as this:

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