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There are several kinds of proxies, the most common of which are: Virtual proxies Hands the creation of an object over to another object (useful if the creation process might be slow or might prove unnecessary) Authentication proxies Checks that the access permissions for a request are correct Remote proxies Encodes requests and send them across a network Smart proxies Adds to or change requests before sending them on Within the scope of the social networking system mentioned earlier, these map as follows: Delaying the creation of a rich environment (virtual proxy) Logging in users (authentication proxy) Sending requests across the network (remote proxy) Performing actions on friends books (smart proxy

You can use the Properties window to set the properties of the currently selected item. So, for example, you can change the label on the button from Button to Get by finding the Text entry in the Properties window and using it to set the button text to Get (see Figure 2-20). You can also change the name of a button using the ID property.

T HIS BOOK IS FOR SOFTWARE developers and designers who develop Java applications for portals. We cover version 1.0 of the Java portlet API, also known as Java Specification Request (JSR) 168. Portlets are the individual components that provide content for a portal. Portals aggregate one or more portlets into web pages, which are usually personalized or customized for individual users or groups of users. Some portals also support mobile devices and voice support. Before the release of this portlet API, each portal had a different API for developing portlets. Most Java portal vendors will support the JSR 168 standard in addition to their existing proprietary API. If you develop your portlets to the new portlet API standard, you can deploy them on any JSR 168-compatible server, just as any compatible servlet container can deploy servlets. You may use the open source portal server Apache Pluto to run the portlets we write in this book. You are able to deploy your portlets on any other portals that support the standard, because none of the portlets will use any proprietary features. We use several open source software components to provide additional functionality beyond the portlet API. Some of the problems we provide solutions for in later chapters are personalization, portal deployment, Single Sign-On (SSO), content syndication, and the porting of an existing application into a portal infrastructure. In this chapter, we discuss portals, information architecture, and background on the portlet API.

Usually, the decision to build a portal environment is made at a high level within an organization after users become frustrated with using applications that are not integrated and are not immediately visible. Other times, a project involving an extranet for suppliers and customers gets started, and the easiest way to aggregate security for all of these new users is through a portal s SSO feature. In this book, we do not discuss the business case for a portal within an organization. We wrote this book for developers and architects who have chosen to use a portal server that implements the Java portlet API and need to solve technical problems.

A major aim of this book is to introduce interesting features of C# and show how they can make writing patterns easier, clearer, and more secure. As each new feature finds a place in a pattern, I will introduce it via a sidebar. This example illustrates the use of some of C# s access modifiers the focus of our first sidebar.

For the stock quote application you are creating, set the properties of the three controls as follows: TextBox: Change the ID to txtTicker. Button: Change the ID to btnGet, and change the text to Get. Label: Change the ID to lblQuote, and change the text to '' (an empty string). The page will now look something like what you see in Listing 2-1.

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:TextBox ID="txtTicker" runat="server"></asp:TextBox> <asp:Button ID="btnGet" runat="server" Text="Get" /> <asp:Label ID="lblQuote" runat="server"></asp:Label></div> </form> </body> </html>