Google, Amazon, and Beyond: Creating and Consuming Web by Alexander Nakhimovsky, Tom Myers

By Alexander Nakhimovsky, Tom Myers

Whereas many books are fascinated with the underlying applied sciences of net prone and others are devoted to delivering net companies, few books exhibit the right way to devour internet companies. This new ebook, Google, Amazon and past: developing and eating net prone, presents an intensive evaluate of the applied sciences and methods for connecting shopper purposes to companies of all types. utilizing a decidedly hands-on process, the authors exhibit broad examples of programming with XML, cleaning soap, WSDL, and UDDI in quite a few programming languages. expertise concerned: Java, Perl, XML, XSLT, WSDL, cleaning soap, XML-RPC, UDDI, JavaScript, .NET, JSP, RSS.

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Additional resources for Google, Amazon, and Beyond: Creating and Consuming Web Services

Example text

If a SOAP error occurs, env:Body may have any number of env:Fault elements. These are SOAP-level error messages that diagnose specifically SOAP-level problems, as distinct from problems reported by the underlying protocols. The env:Fault element has two mandatory children and two optional ones. The mandatory children are faultcode and faultstring, both in no namespace. The optional children are faultfactor and detail, also in no namespace. Their use is as follows: 40 *1313_Ch02_FINAL 10/27/03 11:55 AM Page 41 The Plumbing: DOM and SOAP • faultcode elements are used by software.

This function extracts the hit count from the response to a SOAP Google query. It is called from gsGetCount() as follows: var hitCount=getMessageData(msg,"estimatedTotalResultsCount"); The method takes two arguments: a DOM tree and an element’s name. The DOM tree can be any XML, not necessarily a SOAP message. The element is assumed to contain text rather than child elements. A slightly simplified version of getMessageData() is in Listing 2-2. Listing 2-2. getElementsByTagName(name)[0]; This line uses getElementsByTagName() to obtain an array of all nodes in the tree that have the given tag name.

GsGetCount() uses the doSearch() method of the Google API but ignores its results except for the hit count. The search is done by the doGoogleSearch() method that is invoked from gsGetCount() and itself invokes doGoogleSearchEnvelope() to construct the SOAP request message. Once the message is constructed, doGoogleSearch() invokes doGoogle() to do the actual SOAP exchange and process the result. The dependencies between functions, files, and technologies are summarized in Table 1-1, in the depth-first, top-down order of invocation: Table 1-1.

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