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Introduction to Portals and Portlets
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Providing Technical Solutions with Portals
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Portal implementations usually involve a wide variety of interesting technical problems. Because they are generally systems for integrating a range of business systems, content stores, and web applications, the goals for the portal project are usually specific to the installation. Some of the goals that typically come up are integrating a search engine with the portal and providing an SSO interface for security. Other common development tasks for portal projects include extending personalization across all of the portal s applications, integrating content management systems, and creating portlets for systems that were not designed for portals. In this book, we discuss all of these problems, plus several others, and provide solutions that work within a portal environment. Our hope is that you will be able to take our solutions and make them work for your problems.
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The portlet API has a basic security model based on the servlet security model. Security is an area that is going to depend heavily either on the proprietary features of your chosen portal, or on leveraging a third-party product that can handle a unified security model. Single Sign-On is a key requirement for most portal projects, and we cover the different strategies that can be used for SSO projects. We cover SSO in 8.
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One common requirement for a portal deployment is to implement content syndication on the portal for multiple sources of content. This content could be from a content management system; from an internal groupware application; or from external sources like Reuters, Yahoo!, or CNN. In this book, we discuss using the RSS format for syndicating content on channels. The RSS portlet can consume RSS feeds that other sites publish. We also discuss the mechanics of publishing an RSS feed for an existing content store. Our search engine integrates with RSS, so a content feed constantly updates a list of the top hits for a given search. This is useful for creating ad hoc knowledge management systems within your organization. We will discuss RSS and content syndication in more detail in 9.
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Searching Content from the Portal
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In this book, we use the open source search engine Lucene from the Jakarta Apache project to create a portlet for searching content in a Lucene index. Our Lucene
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search portlet is compatible with any content indexed with Lucene. We demonstrate how to create a simple index from content on the file system. We also deliver the content for the search results inside the portlet. We create the Lucene search portlet in 10.
Portals and Web Services
Portals are a natural fit for a services-oriented architecture. Portlets contain the user interface and controller logic, and call out to a service to retrieve information or execute a transaction. These services run on any platform that supports a Simple Object Access Protocol (SOAP) web services API, and the portlet calls out to them using a Java SOAP toolkit like Axis from the Web Services Apache project, or Glue from webMethods. These services can interface with existing mainframe or client server applications, and new enterprise applications should expose a SOAP web services API. Figure 1-1 shows an example of a portal and web services architecture for a school or university. The enterprise systems for student information and course scheduling have a web services layer that exposes core functionality to the portlets. The web-based courseware service acts as a stand-alone service that can supply content to users of the portal. A desktop application uses SOAP to access the course scheduling system.
Portal Course Add/Drop Portlet Available Classes Portlet
Desktop Application
Student Info Portlet
Student Service
Course Schedule Service
Web-Based Course Service
Mainframe Application
AS/400 Application
Figure 1-1. Example web services and portal architecture
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Introduction to Portals and Portlets
Web Services for Remote Portlets (WSRP)
Another approach is to create a distributed portal infrastructure. A portal that supports the Web Services for Remote Portlets (WSRP) standard can display portlets from other WSRP-enabled portals. The producer portal publishes its available portlets to a registry, and a consumer portal can display a remote portlet from the registry. The protocols for displaying a portlet from a remote location were standardized with the WSRP specification from the Organization for the Advancement of Structured Information Standards (OASIS). We will cover WSRP in 12.
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