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Now that you have some sense of what kind of information is normally being tracked by the system, you can begin to supplement this information with metrics specific to your application. We begin with what we consider the essential basic information that should be logged.

Figure 4 29. The Logout link The minimum that you need to do is to remove the User object from the UserHolder web bean. However, a better way is to delete the session altogether (including the shopping cart, for example) because it will free up the memory. To do that, modify catalog. xhtml as shown in Listing 4-45. Note that you re not setting the outcome (action) so that it remains on the catalog page after logging out. In addition, you will create the action listener to remove the session. Why not specify a method in the action attribute You could do that, but removing the session is a UI-specific task, not a business task. So, an action listener is better.

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The TopMenu.jsp module is trivial. Essentially, it consists of the following element: <a class="link2" href="<%=base%> action=showCart">Show Cart <img src="<%=imageURL%>/cart.gif" border="0"/></a> where the two variables are obtained from the application scope: String base = (String)application.getAttribute("base"); String imageURL = (String)application.getAttribute("imageURL"); The action parameter set to showCart causes the doPost method of ShopServlet to forward the request to /jsp/ShoppingCart.jsp. The LeftMenu.jsp module has to do more. It displays a search field and a list of selectable book categories. The code to accept a search request is as follows: <p>Book Title/Author:</p> <form style="border: 0px solid; padding: 0; margin: 0;"> <input type="hidden" name="action" value="search"/> <input id="text" type="text" name="keyword" size="15"/> <input id="submit" type="submit" value="Search"/> </form> Notice the presence of the hidden parameter named action with the value search, which causes ShopServlet to forward the request to /jsp/SearchOutcome.jsp when the user clicks on the Search button to perform a book search. Here s the code that lists the book categories: <% Hashtable categories = dataManager.getCategories(); Enumeration categoryIds = categories.keys(); while (categoryIds.hasMoreElements()) { Object categoryId = categoryIds.nextElement(); out.println("<p><a href=" + base + " action=selectCatalog&id=" + categoryId.toString() + ">" + categories.get(categoryId) + "</a></p>" ); } %> The DataManager method getCategories only executes another method of the data model: public Hashtable getCategories() { return CategoryPeer.getAllCategories(this); } which interrogates the database to obtain identifiers and names of the available categories (see Listing 8-3).

We list here the various pieces of basic information that we recommend you always track in your logging application: Session ID: Perhaps the single most important piece of information to include is the session ID Because sessions are authenticated at the application level, the underlying system logs will have no real way of knowing which users are carrying out which actions Indeed, as far as the system is concerned, all interactions in a web application are carried out by the webserver daemon user In order to overcome this limitation, application logs must be keyed on the session identity Even anonymous users are usually tracked using a session cookie, a fact that can allow administrators to trace a logged-in session back to the anonymous requests made before it was authenticated.

n this chapter, you ll learn how to use forms to get input from users and store it in a web bean for processing.

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