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1. The community in the SpaceBook application (Example 2-4) was created as static. Rework SpaceBook as a Singleton class. 2. Consider an international airline with a number of servers situated all over the world that are used to process reservations. At different times of the 24-hour clock, some will be heavily loaded and some lightly loaded. Each server can apply to a load balancer to be added to or removed from the system temporarily as time goes by. Model this system with the load balancer as a singleton.

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Next, be sure to use the Properties window to give your controls some friendly names. The names used in this example are shown in Table 3-1. You ll see what they look like in HTML in Listing 3-3.

package com.portalbook.forums.tags; import java.io.IOException; import javax.portlet.PortletRequest; import javax.portlet.PortletResponse; import javax.servlet.jsp.JspException; import javax.servlet.jsp.tagext.TagSupport; public class HrefTag extends TagSupport { /** * Getter for the attribute used to dictate * the path to be rewritten * * @param path The path to be rewritten as an absolute URL */ public void setPath(String path) { this.path = path; } /** * Retrieves the attribute used to dictate * the path to be rewritten * * @return The path to be rewritten */ public String getPath() { return this.path; } /** * Ignores the body of the tag (there shouldn't be one) * and generates an absolute URL for the provided path * attribute relative to the context in which this * portlet is running. * * @return SKIP_BODY * @throws JspException if the output stream cannot be written */ public int doStartTag() throws JspException

There is a symbiosis between patterns and languages, and it is dynamic. As this book has shown, the new features of C# 3.0 have made implementing patterns easier. (A quick comparison of the code in this book with standard C# pattern code will confirm this statement.) Two of the patterns discussed in this chapter the Prototype and Singleton patterns raise some interesting points about pattern language features. Implementing the Prototype pattern was quite a challenge 10 years ago, when obtaining a deep copy of an arbitrary data structure meant creating a graph traversal algorithm from scratch. Now, it can all be done with one method call to Serialize, plus some associated setup of streams. This facility is available to all languages in .NET, and Java has a similar mechanism. Thus, the implementation of the pattern as it was originally envisaged has almost disappeared. Nevertheless, its intent remains, and managing prototypes is still very much part of the developer s task. Considering the Singleton pattern, is there any way in which the language might help to make it reusable * One solution for achieving reusability is to use C# generics, as shown in Example 5-6.

{ try { String contextPath = ((PortletRequest) pageContext .getRequest()).getContextPath(); String absolutePath = ((PortletResponse) pageContext .getResponse()).encodeURL(contextPath + "/" + getPath()); pageContext.getServletContext().log("Path: " + path); pageContext.getServletContext().log( "Context path: " + contextPath); pageContext.getServletContext().log( "Absolute path: " + absolutePath); pageContext.getOut().print(absolutePath); return SKIP_BODY; } catch (IOException e) { throw new JspException( "Could not write to the page buffer while expanding an href custom tag", e); } } // The field to store the path attribute private String path; }

First Number TextBox Second Number TextBox First radio button (Add) Second radio button (Subtract) Submit button Result TextBox

1 using System; 2 3 // Singleton Pattern Judith Bishop Nov 2007 4 // Generic version 5 6 public class Singleton <T> where T : class, new( ){

The tag s TLD entry follows:

txtFirst txtSecond optOption optOption (using the same name groups the radio buttons) btnSubmit txtResult

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<tag> <name>href</name> <tagclass>com.portalbook.forums.tags.HrefTag</tagclass> <bodycontent>NONE</bodycontent> <info> Rewrite a relative URL so that it refers to the position in the page relative to the portlet (this will remove any path information donated by the portal to manage the portlet's state). </info> <attribute> <name>path</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag>

If you aren t familiar with HTML forms code, a few things may seem a little quirky, particularly when dealing with the radio buttons. To create a group of radio buttons where only one is selectable, use the name property and set each one to the same value. So, as you can see in Listing 3-3, each radio button is called optOperation. You distinguish them from each other using the value property. In this listing, you can see that they contain the values Add and Subtract, respectively.

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