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Presentation layer: Translates the data from the network into something that the user can understand and vice versa, translating user input into the language used by the network to communicate For example, when you use a browser to access a page, you type the address of that page This address gets translated for you into an HTTP-GET command by the browser Session layer: Used to establish communication between applications running on different nodes of the network For example, your request from the browser sets up a session that is used to communicate with the server that serves up the page The lower levels are used to discover that server and facilitate the flow, but at this level you have a communication session storing all the data needed to manage the flow of data to the presentation tier for representation on the client.

First Portlet 12 Building the Portlet Application 15 Packaging 19 Deploying 19 Running 21 Portlet Programming 101 21 GenericPortlet 21 Portlet Requests 22 Portlet Response 23 Enhancing the Portlet 25 Webxml Deployment Descriptor 37.

XML was approved as a recommendation by the World Wide Web Consortium (W3C) in February 1998. Naturally, this very fact contributed a lot to such a wide acceptance and support of XML in the software industry. Now that you have brief idea about XML, let s see a simple XML document, as illustrated in Listing 1-1. Listing 1-1. A Simple XML Document < xml version="1.0" > <customers> <customer ID="C001"> <name>Acme Inc.</name> <phone>12345</phone> </customer> <customer ID="C002"> <name>Star Wars Inc.</name> <phone>23456</phone> </customer> </customers> Many rules govern the creation of such XML documents. But we will save them for later discussion.

Lucene is a powerful, open source search engine. We show you how to create an index with Lucene, and then how to build a portlet that searches content in that index.

Transport layer: Handles the task of managing message delivery and flow between nodes on the network Networks are fundamentally unreliable because packets of data can be lost or received out of sync Thus, a network protocol has to ensure delivery in a timely manner or trigger an action upon nondelivery It also works to ensure that the messages are routed, assembled, and delivered correctly For example, when using an Internet browsing session, your message is broken down into small packets as part of the TCP/IP protocol The TCP/IP stack manages sending these packets to the server and assembling them correctly once they reach it Network layer: Used to standardize the way that addressing is accomplished between different linked networks For data to flow from A to B, the locations and paths between A and B need to be known This address awareness and routing is achieved by the network layer.

Why did XML become so popular Well, this question has many answers, and I will present some of the important ones in this section.

This chapter examines the information available to personalize portlets for the current user, and we describe the limited but useful facility for persisting user data. We discuss the use of a rules engine to govern portlet content decisions.

There is almost never a direct connection between a client and a server Instead, the traffic has to be routed across a number of networks through connections that involve changes of addresses between them For example, a server might have the Internet protocol (IP) address 19216801 on its internal network, but that internal network faces the world using a different IP A client calling the server calls the external IP and has traffic on the web port routed to 19216801 This is all , handled by the network layer Data link layer: Defines how the physical layer is accessed that is, what protocols are used to talk to it, how the data is broken up into packets and frames, and how the addressing is managed on the physical layer In the example just described, TCP/IP is the protocol.

We discuss the Web Services for Remote Portlets (WSRP) specification, and then tie WSRP into the broader problem of application syndication.

As you learned previously, XML is a W3C recommendation. This means it is an industry standard governed by a vendor-independent body. History shows that vendor-specific proprietary standards don t get massive acceptance in the software industry. This nonacceptance affects overall cross-platform data sharing and integration. Being an industry standard has helped XML gain huge acceptance.

This chapter demonstrates how an existing real-world application, the YAZD forum software, can swiftly be converted into a portlet application using the techniques described in earlier chapters.