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{ description = string; } public void setPriority(int i) { priority = i; } public boolean getStatus() { return status; } public void setStatus(boolean b) { status = b; } public Date getSubmittedDate() { return submittedDate; } public void setSubmittedDate(Date date) { submittedDate = date; } }

This technique and methodology will prove very useful when you re building your applications. It also introduces a whole new way of thinking about the user experience. Forward caching changes the way in which many applications (e.g., maps) can be presented to the user. If you are building an application that could make the most of this, it s well worth thinking it through and building it into your site.

The portlet application has only one portlet class: ToDoListPortlet. Let s discuss the action request handling first, and then move on to the render request handling. The portlet stores a collection of ToDoItemBean objects in an ArrayList object for each user. This ArrayList object is placed in the user s session as an attribute called ToDoList. Because the portlet and the JSP pages share the same session attributes, if we store the list in the session as application scope, we can access it from either the portlet or the JSP pages. If we had used the portlet scope, the list object s name would be obscured by a namespace. You should store any session

Represents Boolean values (true or false) Represents an 8-bit signed integer (byte) Represents the date and time Represents a decimal number Represents a double precision number Represents a single precision floating number Represents a 4-byte signed integer Represents an 8-byte signed integer Represents string data

Summary

5

attributes you need in a servlet or JSP in application scope. Because we store the ArrayList in the session, if there is more than one instance of the to-do list portlet from the same portlet application on the portal page, they will share the same data.

In this chapter, you took a look at Ajax, seeing some examples of applications where Ajax greatly improves the overall user experience, such as MSN MoneyCentral and Google Maps. You looked at the history of dynamic, partial page refresh technologies, leading up to the XMLHttpRequest object, for which the technique of Ajax was coined. You looked into the architecture of Ajax and how you can use the XMLHttpRequest object in code, before delving into a couple of examples. The first example, though very simple, demonstrated straightaway that the instant-feedback nature of Ajax (as opposed to the traditional delayed-via-postback feedback of a web application) can improve your end users experience. You then looked into another major technique used by Ajax programmers: forward caching. This technique is used by applications such as mapping applications to allow users to get what seems to be instant access to data. Applications using this technique are smart enough to download and cache data that would likely be requested next. When

To create any XSD schema, you first need to think about the simple types, complex types, elements, and attributes going into it. Let s do this exercise for the Employees.xml file. We will create three simple types for Employees.xml: NameSimpleType: This simple type represents names used in our XML document (first name and last name). It puts restrictions on the names: the minimum length must be three, and the maximum length must be less than 255. PhoneSimpleType: This simple type represents phone numbers (the <homephone> element of our XML document). It restricts the phone numbers to no more than 20 characters. NotesSimpleType: This simple type represents notes (the <notes> element of our document). It restricts the notes entered to no greater than 500 characters in length. These three simple types will make a complex type called EmployeeType. The EmployeeType complex type consists of the following: An element called <firstname>, which is of simple type NameSimpleType An element called <lastname>, which is of simple type NameSimpleType An element called <homephone>, which is of simple type PhoneSimpleType An element called <notes>, which is of simple type NotesSimpleType A required attribute called employeeid, which is of type int Finally, we will have an element called <employees> that will contain zero or more subelements named <employee>. The <employee> subelements will be of complex type EmployeeType. Listing 5-3 shows the complete XSD schema containing all the preceding types, elements, and attributes.