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Most manuals state that pageContext is an instance of the javax.servlet.jsp.PageContext class to access all objects and attributes of a JSP page. Similar to what we said concerning JspWriter, this is only partly true, because this class, like JspWriter, is also abstract. In reality, pageContext is an instance of the nonabstract class org.apache.jasper.runtime. PageContextImpl, which extends PageContext. The PageContext class defines several fields, including PAGE_SCOPE, REQUEST_SCOPE, SESSION_SCOPE, and APPLICATION_SCOPE, which identify the four scopes. It also supports more than 40 methods, about half of which are inherited from the javax.servlet.jsp. JspContext class. You have to pay particular attention when using the removeAttribute method, which accepts either one or two arguments. For example, pageContext.removeAttribute ("attrName") removes the attribute from all scopes, while the following code only removes it from the page scope: pageContext.removeAttribute("attrName", PAGE_SCOPE)

We have discussed how to set up a queue, and how to pull jobs off that queue for execution We turn now to the third part of the picture Your web application requires some means of tracking the progress of any batch jobs it creates, and picking up the results when processing is completed For jobs that will take less than a few minutes to make their way up the queue and be executed, the session ID is a viable tracking device, and it is the obvious way to identify the results and make them available to the web application after processing As long as your web application can keep the user around while the job is processed in the background, the results can be picked up directly But with heavy-duty processing tasks or large queues, it may be several minutes or longer before processing is complete.

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The request variable gives you access within your JSP page to the HTTP request sent to it by the client. It s an instance of the org.apache.catalina.connector.RequestFacade class, which Tomcat defines to implement the javax.servlet.http.HttpServletRequest and javax.servlet.ServletRequest interfaces.

When you run the application now, you ll see the Testing message appear in a box. Now it should be clear why you need to put the foo.taglib.xml file and the source XHTML files into the classpath instead of WebContent or WEB-INF: they were designed to be packed into a JAR file for reuse.

Since it is not very realistic to expect a user to maintain an active session for even 15 seconds when nothing is (apparently) happening, it is likely that your application will need something more permanent than a session ID for tracking background tasks If users leave your site to go do something else, it may be hours or even days before they return, by which time their sessions will have long since expired You may also need to account for the fact that the results of a background task started from a computer at work might be expected to be available later on when the user checks in from a computer at home.

s Caution You cannot mix methods that handle parameters with methods that handle the request content.

To handle these situations, you will need to build some sort of ticketing system that assigns a unique key, or ticket, to each job in the queue, and then presents that ticket to the user so that he can redeem it later for the results of the job It may sound complicated, but it s really not To continue our previous example, let s suppose that a user submits an audio file to your busy web application for encoding as an MP3 file Because the MP3 encoder is a CPU hog, your application employs a queue so that only one audio file can be processed at a time Each file in the queue is assigned a unique ID using PHP s uniqid() function.

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