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class, we will have to perform all these things by hand The majority of the items in the code in Listing 832 are self-explanatory based on knowledge you have gained throughout this chapter, but there are a few things that require a more detailed explanation The JSON data that is placed into the body of the request requires a certain format The data must be in the format of parameterName:ParameterData, with the parameter name being the name of the of the parameter in the web service operation, and the parameter data being the JSON representation of the data expected The role of the onCompleted callback function and the parameters passed into it is a new concept introduced with this class and a sign of how close we are getting to the executor that handles the request The onComplete function takes two arguments: an executor and event arguments The executor is of most interest to us because it contains all the information about the request that was made The executor, unless overridden, will be the default XML HttpExecutor class, which handles calling the XMLHttp object directly This class contains a rich set of properties that contain a wealth of information about the request including the status of the request, whether it timed out or was aborted, and the response data, just to name a few (see Table 810) The amount of work required to properly process a request is substantial, with the majority of the work devoted to guring out what the response really is The fact that a result was returned does not mean the result is actually valid Checks to determine whether the header contains a jsonerror entry, if the status code returned is in a valid range, and whether the request timed out or was aborted are needed to ensure the request is processed correctly If we are successful and get a result that was converted to JSON correctly by calling the get_object method on the executor, we can work with the result to populate the form The one catch to the result is the format it is in If you recall from Listing 828, the JSON returned is composed of a d parameter that contains the JSON data from the web service When assigning values to the form, we have to drill into the ProductDetail properties, which are contained in the d parameter.

private void setState(PermissionState state) { permissionState = state; }

public void claimedBy(SystemAdmin admin) {

<!-- businessService structure --> <element name="businessService" type="uddi:businessService"/> <complexType name="businessService"> <sequence> <element ref="uddi:name" maxOccurs="unbounded"/> <element ref="uddi:description" minOccurs="0" maxOccurs="unbounded"/>

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// Call WebRequest CallServiceWithWebRequest(); // WebRequest Wrapper function CallServiceWithWebRequest() { var searchCriteria = new ProductLookupDemoSearchCriteria(); searchCriteriaProductNumber = "200"; searchCriteriaDescription = "Black XBox Controller"; searchCriteriaPrice = 50; var searchCriteriaJSON = SysSerializationJavaScriptSerializerserialize( searchCriteria); var request = new SysNetWebRequest(); requestget_headers()['Content-Type'] = 'application/json; charset=utf-8'; requestset_url("Productsvc/AdvancedLookup"); requestset_body("{\"criteria\":" + searchCriteriaJSON + "}"); requestset_httpVerb("POST"); requestadd_completed(onCompleted); requestinvoke(); } // Completion Handler function onCompleted(executor, eventArgs) { if (executorget_responseAvailable()) { var statusCode = executorget_statusCode(); var result = null; try { result = executorget_object(); } catch (ex) {} var error = executorgetResponseHeader("jsonerror"); var errorObj = (error === "true"); if (errorObj) { //display error var errorMessage = Stringformat("An error occurred with a message of {0} with a stact trace of {1} and an execption type of {2}",resultMessage, resultStackTrace, resultExceptionType); alert(errorMessage); } if (((statusCode < 200) || (statusCode >= 300)) || errorObj)

if (!getState()equals(PermissionStateREQUESTED) && !getState()equals(PermissionStateUNIX_REQUESTED)) return;

{ var error; if (result && errorObj) { //display error var errorMessage = Stringformat("An error of type {0} occurred with a message of {1}",resultget_exceptionType(), resultget_message()); alert(errorMessage); } else { //display error alert(executorget_responseData()); } } else { //update the UI $get("productDescription")value = resultdDescription; $get("productPrice")value = resultdPrice; } } else { var errorMessage; if (executorget_timedOut()) { //display error errorMessage = "Request timed out"; } else if(executorget_aborted()) { errorMessage = "Request was aborted"; } else { //display error errorMessage = "Error occurred no result returned"; } } }

<element ref="uddi:bindingTemplates"/> <element ref="uddi:categoryBag" minOccurs="0"/> </sequence> <attribute name="serviceKey" use="required" type="uddi:serviceKey"/> <attribute name="businessKey" use="optional" type="uddi:businessKey"/> </complexType>

2 PermissionState now contains six constants, all of which are instances ofPermissionState To make each of these constants an instance of a subclass of PermissionState, I apply Extract Subclass [F] six times to produce the result shown in the following diagram

Web Request Core The web request core components make up the underlying plumbing that supports the asynchronous communication model in the Microsoft AJAX

[View full size image]

<!-- bindingTemplate structure --> <element name="bindingTemplate" type="uddi:bindingTemplate"/> <complexType name="bindingTemplate"> <sequence> <element ref="uddi:description" minOccurs="0" maxOccurs="unbounded"/> <choice> <element ref="uddi:accessPoint" minOccurs="0"/> <element ref="uddi:hostingRedirector" minOccurs="0"/> </choice> <element ref="uddi:tModelInstanceDetails"/> </sequence> <attribute name="serviceKey" use="optional" type="uddi:serviceKey"/> <attribute name="bindingKey" use="required" type="uddi:bindingKey"/> </complexType>

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