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In a fully decoupled system, you want to write code that isn t dependent on the concrete implementation of the classes. To accomplish this goal, you can use a repository that stores mappings between the service interfaces and the service implementations. A service locator is such a repository; it handles registrations of types and maps them to one or more implementations. The Microsoft Patterns & Practices group has created a base service locator implementation and a specific service locator for SharePoint. The SharePoint Service Locator allows developers to store different type-mappings at different levels in SharePoint, such as farms or site collections. That way, your service can use different Models or Views depending on where it s located or depending on what features have been enabled at the current level.

if(DisplayOK){

drawWidth = 243;

drawHeight = 242;

gdrawRect(60, 40, drawWidth + 1, drawHeight + 1);

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13.3.1 Service locators The problem with this implementation uses Service1 of the Web Part is that you re referencing a Model implementation in the code of the Presenter. To switch to another ClassA Model, the Web Part must be compiled and redeployed to SharePoint not a uses Service2 very flexible solution. It s also hard to test the Presenter in isolation using unittests because it depends on the Model, as you can see in figure 13.7. If you d like Figure 13.7 Using multiple services for a class to dynamically switch between different requires custom code that handles the request for the correct service during runtime. Model implementations, you need to provide logic for that. A service locator is a central repository that contains references to services and the different implementations of the services. Services are registered in the service locator, and classes can query the service locator for a specific service to get an instance of it, as you can see in figure 13.8.

gdrawImage(image, 61, 41, drawWidth, drawHeight, this);

We've already seen what an XML document looks like, such as this representative example (we'll see how to construct XML documents like this one in this chapter): < XML version = "10" >

<!DOCTYPE DOCUMENT [

Figure 13.8 Using a service locator allows for dynamic changes during runtime of services. The service locator is a shared service within the application that handles registration and location of services.

Environment: Rational RequisitePro, MS Project 2002, MS Visio, Test Director, Java, Windows NT/2000

As you can see, all the information in an XML document like the one above is packed pretty densely To make use of that information, we have to unpack it, and that process is known as parsing Parsing an XML document is the first step in working with that document To work with an XML document in code, we have to be able to access the elements in that document, and we do that by parsing the document, which breaks the XML document up into a logical tree This tree represents the structure of the XML document, as we'll see It is this tree that we'll work with when we work with XML documents For example, we can parse this small XML document: <CUSTOMER>

When we parse this document, this is the tree generated[md]note that the text Britta Edwards is considered a child of the <NAME> element (as mentioned in the last chapter, PCDATA stands for parsed character data[md]XML data that has no child data beneath it): Document

----Element(type=ELEMENT, name=CUSTOMER, numChildren=2)

Services are registered in the service locator using an interface or a key-value and a reference to its implementation. The classes using the service locators use the interface or key to query for the implementation of the service and the service locator decides which implementation to use at runtime. The service locator preferably has a persistent storage but can also be populated during application initialization. The locator allows the application to locate a service during runtime and use it. Adding new services might not always require that the code be recompiled because the classes only depend on an interface or a key.

|---Element(type=COMMENT, text="I am a comment")

---Element(type=ELEMENT, name=NAME, numChildren=1)

----Element(type=PCDATA, text="Britta Edwards")

13.3.2 Use the SharePoint Service Locator The SharePoint Service Locator provides functionality to register a service using an interface and an optional key value and functionality to locate an implementation of a

After parsing an XML document, we can work through it element by element, looping over each element's child elements, as we'll see

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