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The VEMap control contains all the code necessary to handle mouse interaction. If you hold the mouse button down on the map, you can drag the map in any direction with the map being updated in a completely AJAX manner. This is an excellent showcase of AJAX and its importance in web applications, namely that asynchronous updates can significantly improve the user experience. In this case, the map you are viewing consists of a number of tiles. As you are viewing the map surface, the tiles for the surrounding areas are downloaded and cached. If you drag the map around, another download for these tiles isn t necessary. However, if you drag really fast to see areas that are far away, you ll see that VE is working to catch up, caching the tiles as it goes. During this time, you often notice blank tiles or sometimes tiles with an icon. See Figure 9-3 for an example of this.

The implementation for the Web service requires the following four steps: Step 1: Configure the Web service to use WSE 2.0. Verify that the web.config file includes the standard WSE elements for the WebServicesConfiguration and WebServicesExtension classes. Remember to use the WSE 2.0 Configuration Settings Editor to avoid having to manually type these entries. Step 2: Configure the security token service provider in the web.config file. The WSE class framework provides a ready-to-use handler for implementing the STS provider. All you have to do is register it correctly in the web.config file, as outlined in more detail later in this chapter. The handler will automatically generate a security token for use in the secure conversation. Step 3: Create a custom token manager. This step is required in order to process the signature of the client request that initiates the secure conversation. If the client s signature cannot be verified, then the rest of the workflow cannot proceed. Recall that this signature will later be used to sign the security context token. Step 4: Implement policy verification. In the Web service itself, implement code to verify policy requirements programmatically, including digital signature and encryption requirements. Alternatively, you can create a policy framework file.

The implementation code for the SOAPService RequestQuote method is shown in Listing 8-12. The most important aspect of this code listing is the SoapActor attribute, which decorates the Web service class (shown in bold). This attribute designates the specific recipient of the message response, in this case the SOAP router, which will in turn pass the response back to the original sender. If the SoapActor attribute is not provided, the Web service request will generate an addressing error upon receipt, because the most recent sender of the request (the SOAP router) will not match the first sender and ultimate recipient of the response (the SOAP sender). The SoapActor attribute allows for messages to be accepted by services after passing through intermediaries. If you ever need to drop the SOAPRouter, and wish instead to call the StockTrader Web service directly, make sure to change the SoapActor attribute value to the URL of the Web service itself, in this case: http://localhost/SOAPService/StockTrader.asmx. Listing 8-12. The SOAPService RequestQuote Method using Microsoft.Web.Services3; using Microsoft.Web.Services3.Messaging; [SoapActor("http://localhost/SOAPRouter/StockTrader.asmx")] public class StockTraderService : Microsoft.Web.Services3.WebService { public Quote RequestQuote(string Symbol) { // Step 1: Instance a new Quote object Quote q = new Quote();

If you look at an HTTP trace (using any HTTP tracing utility) of what is happening as you run this application, you ll see the following. (Much of this has been removed for brevity.) Take note that the VE service implements the mapping functionality, returning the correct map tiles upon requests from this client library. First the browser issues the initial request to a page:

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The client application requires a fair amount of custom code, although it shares many similarities with what you have seen in previous chapters The biggest difference from before is that the client now implements the workflow for initiating the request to the security token service provider This code is in addition to any code that the client already implements for interfacing with the target Web service The implementation for the client requires the following six steps: Step 1: Generate a security token for signing the upcoming service token request This security token has nothing to do with the security context token that you will ultimately use to secure the conversation between service and client Instead, this security token is only used by the client to generate a signed request to receive a security context token from the STS provider.

#1 10:34:27.328 127.0.0.1:4611 GET /chapter9/Default.aspx HTTP/1.1 Accept: */* Accept-Language: en-us Accept-Encoding: gzip, deflate Connection: Keep-Alive

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