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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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Using an HTTP Client Library to Execute a Query An HTTP request is not complicated to create, but there are some things that need to be accounted for. For example, when making a request by using the query Newest Applications, the query has to be URL-encoded to Newest+Applications. If you do not URL-encode the query string, problems will occur because the server will most likely be unable to process the request. Therefore, when making HTTP requests, use a client library that manages URL encodings, HTTP cookies, and anything associated with the technical details of using the HTTP protocol. The examples in this book use Java and the library HttpClient, which is an Apache Jakarta Commons library (http://Jakarta.apache.org). Following is the Java source code used to prepare the request: HttpClient client = new HttpClient(); HttpMethod method = new GetMethod( _endpoint); String timeStamp = Signature.generateTimestamp(); String signature; String operation = "WebSearch"; try { signature = Signature.generateSignature(operation, timeStamp, _secretAccessKey); } catch (SignatureException e) { return; }
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E B V N method defines the parameters of the HTTP request. The Amazon.com search request requires
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an HTTP GET, which is possible by instantiating the GetMethod class. The signature and operation variables contain the values used to define the associated URL variables. The variable _endpoint contains a value from the configuration file that is the HTTP URL used to call the Amazon.com web service. The method Signature.generateSignature converts the configuration-defined Amazon.com secret access key (_secretAccessKey) into a hash-encoded value. To call the Amazon.com REST web service, the variables are assembled and form an HTTP request: NameValuePair[] items = new NameValuePair[] { new NameValuePair( "Service", "AlexaWebInfoService"), new NameValuePair( "Operation", operation), new NameValuePair( "AWSAccessKeyId", _accessKey), new NameValuePair( "Signature", signature), new NameValuePair( "Timestamp", timeStamp), new NameValuePair( "ResponseGroup", "Results"), new NameValuePair( "Query", _request.getQueryString()) }; method.setQueryString( items); try { client.executeMethod(method); if( method.getStatusCode() == 200) { processResults( _request.getQueryIdentifier(), method.getResponseBodyAsStream()); }
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The variable client is the top-level variable used to make an HTTP request. The variable
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CHAPTER 11 REST-BASED MODEL VIEW CONTROLLER PATTERN
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} catch (IOException e) { System.out.println( "oop error (" + e.getMessage() + ")"); } The type NameValuePair defines an array of key value pairs that are assembled and URLencoded into a query string. The method setQueryString converts the array into a query string. To execute the HTTP request, the method executeMethod is called. If the return code is 200, the request was successful. Because the HTTP request was successful does not mean that the response will contain any data. To know if there are any results, a parser will need to inspect the response. The undefined method processResults converts the response from an XML stream into a result that is added to the controller (further details of this method are beyond the scope of this chapter). The method getQueryIdentifier is used to identify which query identifier the result is associated with. The query identifier is part of the Persistent Communications pattern and is used to identify which query a result belongs to.
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Using Google to Search for Something
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Google allows outside developers to access their search engine technologies by using the SOAP web service API. In the example, the Java-based Axis 1.x engine was used to convert a Web Services Description Language (WSDL) file into a client stub. The client stub performs an automatic serialization of the XML data. In essence, a WSDL file does the same thing as an XML schema file used to generate a serialization stub. The serialization stub contains a number of E B V N types that are used to serialize and deserialize XML. For reference purposes, a WSDL file does contain an XML schema file. The following source code illustrates how to call the Google search engine web service: String queryIdentifier = _parent.getQueryIdentifier(); GoogleSearch searchRequest = new GoogleSearch(); if( _endPoint.length() > 0) { searchRequest.setSoapServiceURL( _endPoint); } searchRequest.setKey( _key); searchRequest.setQueryString( _request.getQueryString()); try { GoogleSearchResult searchResult = searchRequest.doSearch(); if( searchResult != null) { GoogleSearchResultElement[] results = searchResult.getResultElements(); for( int c1 = 0; c1 < results.length; c1 ++) { _parent.addResult( new SearchResult( results[ c1].getURL(), results[ c1].getTitle(), results[ c1].getSnippet(), transactionIdentifier)); } } } catch (GoogleSearchFault e) { return; }
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