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complex message pathways because of its infrastructure-level support for addressing and routing specifications Finally, the diagram makes no mention of a specific transport channel This implicitly emphasizes WCF s most important advantage of not having to factor in the transport and messaging infrastructure into the application design In contrast, today s ASPNET Web services that leverage WSE 30 still require the developer to write manual code that is specific to alternate transport channels, such as TCP In WCF, the service is the basic component of an application, and it supports a special kind of object called a typed channel that is equivalent to today s proxy objects for Web service clients The typed channel provides an interface for sending and receiving messages between service components WCF provides a utility called WSDLgenexe, which is similar to today s wsdl.

Menu attributes (http://drupal.org/project/menu_attributes) allows you to specify additional attributes for menu items, such as id, name, class, style, and rel. This module is perfect in a number of situations:

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The check box is then unchecked to indicate to the user that the automatic refreshing has been temporarily disabled The updateStockQuote function is the function that actually performs the Ajax request Like the previous examples from this chapter, it uses the Taconite JavaScript client to do the dirty work of creating the XMLHttpRequest object, adding the desired parameters to the query string, and sending the request The startUpdateStockQuoteInterval function uses the windowsetInterval method to start automatic refreshing of the stock quotes The first parameter in the call to windowsetInterval is a string representing the startUpdateStockQuoteInterval function, and the second parameter is an integer representing the time delay, in milliseconds, between calls to the specified function Notice how the windowsetInterval method returns a unique ID of this particular interval, which is stored in the stockTickerUpdateIntervalID variable that is used later when clearing the interval.

exe utility, and allows you to generate proxy class files for clients to use for accessing your service Typed channels are independent of the actual objects that process the service request WCF employs Service Manager objects that are responsible for mapping typed channels to their associated business objects, including the DialogManager and ListenerManager objects The WCF service layer automatically handles the receiving, processing, and sending of messages, including all of the serialization work that is required to build and process a message This is very similar to the way that the ASP NET infrastructure processes messages that are received and sent via an asmx Web page WCF provides the Service object for its services, which is conceptually equivalent to the ASP NET WebService object The Service object provides you with programmatic access to the underlying messaging and transport infrastructure.

Figure 2-17. Site information and the main administrator account are entered when configuring your site. Server settings and update notifications must be configured, as shown in Figure 2-18. Select your default country and time zone. This can be any time zone of your choosing; it is used by a number of modules, so I usually pick the time zone in which the client is located. You can also enable both Check for updates automatically and Receive e-mail notifications to receive e-mails to the main administrator account when either core Drupal or a contributed module has an update (in other words, Drupal 7-1 to 7-2).

After Drupal has been successfully installed and configured, you now need to fix the orange message by changing the permissions of a few folders and files. Using SSH Secure Client, navigate to the foundationdrupal7.com folder, right-click, and select Properties; then set the permission to 755, as shown in Figure 2-19.

Finally, the handleTrackFlagClick function handles the check box s onclick event If the check box becomes checked, it immediately refreshes the stock quotes by calling the updateStockQuote function, and then it initiates the automatic refreshing by calling the.

The WCF service layer also supports a special kind of service called RemoteObjects, which is functionally equivalent to today s NET Remoting enabled solutions in that it allows you to invoke remote distributed objects while preserving object type fidelity during transport RemoteObjects uses RPC-style communications, and like NET Remoting, it can be used for both interprocess communications and Internet communications that operate across different application domains..

Figure 2-19. The site configuration directory s permissions must be reset to 755 after install. You also need to change the permissions of settings.php back to 644, as shown in Figure 2-20.

startUpdateStockQuoteInterval function. If the check box becomes unchecked in response to a user s click, then the automatic refreshing is disabled by calling the clearStockTickerUpdateInterval function. The implementation for automatically refreshing the weather forecast and headline news components is similar to what was described for the stock quote component. As you can see, the automatic refreshing is not terribly difficult to implement. The key is breaking tasks out into small, reusable functions and then building on top of those reusable functions. The entire file is less than 40 lines long. Better yet, thanks to the Taconite framework, only five lines of JavaScript are necessary to perform the Ajax request!

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