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ShopSavvy is a longtime favorite free app (Figure 14 13). It debuted on the Android and really showed off the potential of the phone. It uses your camera to scan in bar codes and comparison shop with both local and online items. Local shopping results are sometimes limited.

Implementing the local clients means implementing a search client, which is called by both the synchronous and asynchronous interfaces. The Amazon.com and Google search engines were chosen as examples because each one uses a different web service technology. For the Amazon.com search engine, the local client will use client-side REST technologies. For the Google search engine, the local client will use client-side SOAP technologies. For each of the local client implementations, the implementation must be thread-safe and scalable. Of course, most of the client technologies in .NET and Java are thread-safe and scalable.

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A phenomenon of the SharePoint ecosystem is the explosion of third-party web parts. This is very similar to the situation after Visual Basic 5 was introduced, when Microsoft made available a well-documented API for creating add-on components. It was the vast array of add-on components that made Visual Basic the platform of choice for corporate developers. I believe the large and growing number of off-the-shelf components for SharePoint will have the same impact on this platform. However, it s early in this process, and many of the add-on web parts are still rudimentary. In addition, the choice of whether to build or buy a new web part (ideally) should not be based on whether you have the knowledge or skills to build it, but what will be the best use of your scarcest resource: time. With that in mind, we spent a large part of the book looking at how to work with the SharePoint object model to build our own web parts and other components. Depending on the size of your firm, number of application development resources, and availability of off-the-shelf components to meet your needs, you might choose to buy rather than build most if not all your components. Having the ability to build your own, however, will allow you to make more informed build/buy decisions. Let s now review the components we created earlier in this book.

You can set price alerts, tweet about your scans (although this gets obnoxious), view your history, create a wish list, and more. If you re searching for an item that either doesn t have a bar code or has a store sticker over the bar code, you can also enter your search terms by hand. Best of all, ShopSavvy supports QR codes, so if you download this app first, you can scan any of the QR codes you see in the rest of the book.

To make a REST request, two technologies are needed: an XML processor and an HTTP client library. In the explanation of the Infinite Data pattern, I illustrated the concept of using XML schema to generate stubs that are used to read and write XML. The same XML strategy is used here, and the details are beyond the scope of this chapter. If you want to see the details, please refer to the Being Aware of Multiple Types section in the chapter about the Infinite Data pattern, which explains how to read and write XML. The Details of the REST Request Executing a query by using the Amazon.com REST interface is identical to calling another Ajaxtype web service. The Amazon.com REST request is an HTTP request that is illustrated as follows and is executed on the server awis.amazonawis.com:

GET /onca/xml Service=AlexaWebInfoService& Operation=WebSearch& AWSAccessKeyId=[REPLACED]& Signature=FQTh4DvvIwVB1QrVcUrgSqFXgNo%3D& Timestamp=2005-10-31T19%3A44%3A24516Z& ResponseGroup=Results& Query=Applications HTTP/11 Content-Type: text/html; charset=UTF-8 User-Agent: Jakarta Commons-HttpClient/30-rc3 Host: awisamazonawscom:80 The indented code in the preceding example is part of a single line but has been separated for better clarity The text [REPLACED] is pseudo-text for the Amazoncom access key, which you need to perform a search For a search, there are multiple variables: Service, Operation, AWSAccessKeyId, Signature, Timestamp, ResponseGroup, and Query The purpose of the variables is beyond the scope of this chapter and is best explained by the Amazoncom documentation What this does is highlight that to perform a search by using the Amazoncom search engine, there are a number of variables to define that are not available in the necessary data passed to the local client from the client.

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