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The primary reason for refactoring to the State pattern [DP] is to tame overly complex state-altering conditional logic Such logic, which tends to spread itself throughout a class, controls an object's state, including how states transition to other states When you implement the State pattern, you create classes that represent specific states of an object and the transitions between those states The object that has its state changed is known in Design Patterns [DP] as the context A context delegates state-dependent behavior to a state object State objects make state transitions at runtime by making the context point to a different state object Moving state-altering conditional logic out of one class and into a family of classes that represent different states can yield a simpler design that provides a better bird's-eye view of the transitions between states On the other hand, if you can easily understand the state transition logic in a class, you likely don't need to refactor to the State pattern (unless you plan to add many more state transitions in the future) The Example section for this refactoring shows a case where state-altering conditional logic is no longer easy to follow or extend and where the State pattern can make a real difference Before refactoring to State, it's always a good idea to see if simpler refactorings, such as Extract Method [F], can help clean up the state-changing conditional logic If they can't, refactoring to State can help remove or reduce many lines of conditional logic, yielding simpler code that's easier to understand and extend This Replace State-Altering Conditionals with State refactoring is different from Martin Fowler's Replace Type Code with State/Strategy [F] for the following reasons Differences between State and Strategy: The State pattern is useful for a class that must easily transition between instances of a family of state classes, while the Strategy pattern is useful for allowing a class to delegate execution of an algorithm to an instance of a family of Strategy classes Because of these differences, the motivation and mechanics for refactoring to these two patterns differs (see Replace Conditional Logic with Strategy, 129) End-to-end mechanics: Martin deliberately doesn't document a full refactoring to the State pattern because the complete implementation depends on a further refactoring he wrote, Replace Conditional with Polymorphism [F] While I respect that decision, I thought it would be more helpful to readers to understand how the refactoring works from end to end, so my Mechanics and Example sections delineate all of the steps to get you from conditional state-changing logic to a State implementation If your state objects have no instance variables (ie, they are stateless), you can optimize memory usage by having context objects share instances of the stateless state instances The Flyweight and Singleton patterns [DP] are often used to implement sharing (eg, seeLimit Instantiation with Singleton, 296) However, it's always best to add state-sharing codeafter your users experience system delays and a profiler points you to the state-instantiation code as a prime bottleneck.

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The SysNetWebServiceProxy class is the base class used for proxies generated by the ScriptManager and provides the web service request and response functionality for inherited classes The class contains properties to set the path of the service to call, the timeout for each request, the default user context data passed through the request call and made available to the callback functions, the default success callback function, and the default failure callback function (see Table 86) The class also contains an invoke method that calls the speci ed web service dependent on the path and handles all the pre- and post-processing that occurs during the call (see Table 87)

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In a world full of Web services, Universal Description Discovery and Integration, UDDI, becomes an extremely valuable component As a service built into Windows NET server, UDDI is also likely to become the de-facto standard Web services catalog within the enterprise Therefore, to complete the Web services story, I will explain what UDDI is and the scenarios where applications can benefit from private as well as public UDDI implementations I will focus on writing UDDI-enabled applications that communicate with UDDI as a SOAP-based Web service

+ + + Reduces or removes state-changing conditional logic Simplifies complex state-changing logic Provides a good bird's-eye view of state-changing logic Complicates a design when state transition logic is already easy to follow

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defaultSucceededCallback Gets or sets the default succeeded callback func-

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This introduction would not be complete without explaining the situations where you should not use Web services It is clear that Web services offer the most benefit in cases where interoperability and/or remoting over the Web are desired That being said, there are many scenarios where you don t benefit from using Web services Single Machine Applications There are still many desktop applications for business and personal use Some of those applications might need to communicate with others running on the same machine In this case, it is almost always better to use a native API rather than a Web service Software component technologies such as COM and NET class libraries or components are very effective in this scenario because using such components requires

If we refer back to the product proxy class prototype in Listing 824, the _invoke method that provides the functionality for the Lookup method is actually a reference to the invoke method of the WebServiceProxy class The product class uses this method to call the service, using the pre- and postprocessing that the invoke method provides, including setting the content type, serializing the parameter data to JSON, submitting the response, handling the response from the asynchronous request, and calling the registered succeeded and failed callback functions The abstraction to the underlying HTTP transport that the WebService Proxy class provides makes it a great class to not only inherit from but to directly use when you need to communicate with a web service in a customized way

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