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The Memento class keeps the state of the Originator but does not allow other classes to access that state. It therefore preserves encapsulation boundaries, relieving the Originator of this responsibility. In sum, the roles in the pattern are:

5

PortletContext portletContext = getPortletContext(); PortletRequestDispatcher prd = PortletContext.getRequestDispatcher("/jsp/homePage.jsp personalize=NONE"); prd.include(request,response);

This XMLHttpRequest ActiveX control is the heart of Ajax Oddly enough, although it was released to the wild in 2000, it didn t really pick up until nearly five years later There are a number of possible reasons for this, including browser support initially, XMLHttpRequest was Internet Explorer only Another reason was likely the availability of broadband Increasing broadband penetration over that five-year period lead to a greater demand for richer web applications and more incentive for web sites to provide richer experiences The first Ajax application that I used was Google Maps with mapping being the perfect sweet spot for consumer-oriented rich applications Consider your workflow when using a mapping application you enter an address and receive a map showing the area around your address You then likely want to inspect the area around that address, for example, to plot routes to that address.

To test whether you understand the Memento pattern, cover the lefthand column of the table below and see if you can identify its players among the items from the illustrative example (Figure 10-7), as shown in the righthand column. Then check your answers against the lefthand column.

the request object. This can be useful for providing temporary overrides of parameters for one JSP page, while keeping the portlet s parameters intact for use on other JSP pages and servlets. If you would like to load a servlet through a request dispatcher, map the servlet to a path in your portlet application s web.xml deployment descriptor. Use the <servlet-mapping> element in the web.xml file, just as you would for a normal web application. Here is a snippet of code that includes a servlet with a request dispatcher:

Before Ajax was used, you would pan around the map using North, South, East, and West buttons The Ajax implementation used XMLHttpRequest to download the surrounding areas of the map in the background while you were inspecting the map You would then drag the mouse around the map, and they would appear Of course, if you dragged quickly, the tiles may not have been in place yet, and you would get a blank map while they downloaded but the experience was still vastly superior to full page refreshes The improvement in the user experience and the reduced amount of bandwidth that needed to be served to provide it created an irresistible new design pattern for web sites and experiences, and it wasn t long before use of XMLHttpRequest became commonplace At the same time, the concept of Web 20 was emerging.

The chessboard with pieces on it The program that saves the state of the board A checkpoint of the state of the game Playing chess on the electronic chessboard

PortletContext portletContext = getPortletContext(); PortletRequestDispatcher prd = portletContext.getRequestDispatcher("/patents"); prd.include(request,response);

This concept, invented by Tim O Reilly, described the next phase of the Web, built around services that allowed users, not just web developers, to be contributors of information Effective collaboration from novice users requires an enhanced experience, and Ajax was there to provide it As such, in developer terms, Ajax is pretty synonymous with Web 20 In the next section, we ll take a look at getting started with Ajax programming and some of the neat things that you can do with it!.

A named dispatcher is useful for loading servlets or JSP pages that have been given a name in the portlet application s web deployment descriptor. It also returns a PortletRequestDispatcher object. One important difference is that it is impossible to pass a query string to a servlet or JSP that is called through a named dispatcher. If we have a servlet named SingleSignOnServlet, we could include it when we render the portlet, using code like the following: