Lately, with the availability of developer APIs from Web-service giants, such as Google, Yahoo, eBay, and Amazon, Web mashups have gained a lot of attention.
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According to ProgrammableWeb, a Web mashup is "a Web page or application that combines data from two or more external online sources. The external sources are typically other Web sites and their data may be obtained by the mashup developer in various ways, including, but not limited to APIs, XML feeds,and screenscraping.
To build a mashup, you need access to a minimum of two data sources that can be combined to create a service, which is not otherwise available from either source. Popular mashups, such as Housing Maps and Chicago Crime, make use of a geospatial data service, such as Google Maps or Yahoo Maps, as one of those sources. Other mashups offer product listings, ratings, auction prices, and so forth by combining catalog data from Amazon with auction data from eBay.
This article describes how to build a mashup portlet that can aggregate geospatial data from data sources and combine it with an online mapping service based on Asynchronous JavaScript and XML (AJAX) to generate a mashup. Included are the portlet's source code and techniques for deploying the portlet to Sun Java System Portal Server 7 (henceforth, Portal Server). At the end of the article is a list of reference resources.
Because portlets can incorporate mashups, the latter are a natural fit for portals. A portlet can fetch content from various data sources to create a mashup. Subsequently, the portal can personalize that data so that its users can have their own mashups with data sources that suit their individual needs, hence saving a major task in the development cycle.
A portal with business monitoring mashup portlets can act as a dashboard for tracking performance indicators that are grouped together for easy visual representation of early warnings and exceptions. Accordingly, executives can configure their dashboards to monitor performance and create personalized mashups with just a few clicks.
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