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The Java Authorization Contract for Containers (ACC) is a Java Community Process (JCP) set of extensions to the standard methods already discussed in this chapter. It codifies a system that makes more comprehensive use of Principals than that currently available with the servlet API. Although this specification is not yet commonly implemented in servlet containers, you should expect it to become more prevalent. It is likely that portlets will adopt this system of necessity since they rely on the servlet API for most of their services. The details of the specification can be obtained from the JCP home page at www.jcp.org.

Some alternative implementations of the Fa ade pattern are: Transparent fa ades The fa ade described in the preceding example is opaque, in that the subsystems cannot be accessed except via the Fa ade object. This requirement might be too stringent. Suppose some users want to get at the individual operations of particular subsystems. We can change all the internal modifiers to public, which will make the fa ade optional, or transparent. That is, as well as being able to go through the Fa ade, the client will be able to instantiate SubsystemA directly, for example, and then call A1.

Bevel: This shaves the edges off the join, thus smoothing it. Miter: This keeps the default edging. Round: This rounds off the edges of the join.

Summary

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This chapter has discussed the methods that are available to portlets to identify the user. We have described how they relate to the corresponding methods in servlets, and how they can be used to authenticate the user against external services. We have also covered some of the techniques available for assigning and determining the roles of users. We used the Kerberos v5 protocol to demonstrate SSO authentication using JAAS, and we also used the GSS-API to authenticate a user on another system. The GSS-API is a standard for authenticating users in enterprise applications to a wide range of security mechanisms and protocols. In the next chapter, we cover syndication of information into and out of your portlets using the RSS protocols.

Earlier, you saw several of the common visual elements that are used in XAML, including Canvas.Top and Canvas.Left. There are a number of other properties that many XAML elements have in common. In this section, you ll take a look at these, and from there you ll be able to understand the subsequent sections a little better!

Static fa ades In most cases, there will only be one instance of a fa ade in the client for a set of subsystems, so its operations could more appropriately be called on the user s side as members of the class itself, as in:

IN THIS CHAPTER, we describe how portlets can aggregate links to content on external web sites using the group of standards known as RSS. We also discuss how the content of your own portal could be syndicated for convenient inclusion in external sites using the same mechanism.

You ll typically use the Height and Width properties to set the dimensions of an item. These take a double value so, for example, to create a 50!100 rectangle, you define its XAML as follows:

RSS is not a single standard. It is several standards, some closely related, and others more loosely so. The versions of RSS that are most commonly used are 0.9 and 0.91, both of which were released by Netscape to allow content from external web sites to be aggregated into its My Netscape portal. Since 0.91, two groups have produced new versions of RSS with varying degrees of backward compatibility. The company UserLand Software carried out early development of RSS for Netscape and has subsequently released versions 0.92, 0.93, 0.94, and 2.0. The RSS-DEV working group (an independent group of developers) released the 1.0 version of RSS stemming from the 0.91 version.

public void ClientMain ( ) { Fa ade.Operation1( ); Fa ade.Operation2( ); }