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Service Application Framework
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The services architecture within SharePoint is very clever and provides a lot of functionality out of the box The SPServiceApplication object (I ll use this term to also include any object that s derived from SPServiceApplication), acts as an endpoint for potentially many server-level instances of a service As a result, by making use of the SPServiceApplication object for all calls into the service, you can easily implement advanced functionality such as load balancing and fault tolerance Furthermore, since the configuration of the service is also done at the SPServiceApplication level, providing backup and restore functionality is also relatively straightforward
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You ve seen how services are configured and managed on the server side within a SharePoint farm The primary focus of the service object model is on the configuration and management of services as opposed to the actual implementation When it comes to physically doing whatever the service needs to do many implementations are possible, each appropriate in different situations For example, the SharePoint Server Search Service makes use of a Windows Service that can be installed on various servers throughout the farm, whereas the
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Secure Store Service uses a central database to store its data and instead handles requests in real time on the server where they are received In both of these cases, and for all situations where communication is made with a service that s managed using the Service Application Framework, communication between client and server occurs via the SPServiceApplication server object From a client perspective, because the SPServiceApplication object is well-defined, you can create an appropriate matching proxy object This is represented in the object model by the SPServiceApplicationProxy object, as shown next This client/server proxy pattern makes it easy to develop code that uses a particular service, since a strongly typed proxy object is readily available that exposes the appropriate functionality We don t need to worry about where the service is running, how it s implemented, or even how the SPServiceApplicationProxy object communicates with the SPServiceApplication object; all we need to know is which methods to call and which parameters to pass in I m sure you ll agree that this is pretty powerful stuff
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Client Components SPFarm ServiceProxies SPServiceProxy ApplicationProxies SPServiceApplicationProxy ServerInstances SPServiceApplication Service Server Components SPFarm Services SPService Instances Servers SPServer ServiceInstances
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SPServiceInstance
So the SPServiceApplicationProxy is our entry point into a service application on the SharePoint platform This raises the question, How do we pick up a reference to the appropriate proxy object More than one instance of a service may be running on a farm, so how can we be sure that we have the correct one The answer is the SPServiceProxy object As you saw in the discussion of server objects, each service is represented by an SPService object that in turn provides a collection of SPServiceApplication objects that each represent a single instance of a service The same is also true on the client side: the SPServiceProxy object provides a collection of SPServiceApplicationProxy objects, each representing a proxy for a single instance of a service NOTE I ve done a lot of talking here about client and server components It s important for you to recognize that on many occasions, both client and server are essentially different aspects of the same server farm Both SPServiceProxy objects and SPService objects can be referenced via the Service and ServiceProxies properties of the SPFarm object
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Service Application Framework
Client/Server Communication
You ve seen that the communication mechanism between client and server is abstracted by means of the strongly typed SPServiceApplication and SPServiceApplicationProxy classes In fact, the SPServiceApplication and SPServiceApplicationProxy classes are abstract classes to use these objects, a concrete implementation must first be created Out of the box, we can use two default concrete implementations in our custom applications: SPUsageApplicationProxy, which is used to communicate with services such as the Web Analytics Data Processing Service and the SPIisWebServiceApplicationProxy, which is used for all other services The main difference between these implementations is the underlying communications mechanism used between client and server The SPIisWebServiceApplicationProxy makes use of the Windows Communication Foundation (WCF) for all communications and therefore offers a high level of built-in flexibility This is why it s used by almost all of the services available on the SharePoint platform NOTE You can create custom implementations of the SPServiceApplicationProxy and SPServiceApplication This may be appropriate when communication is being made to a legacy system In-depth discussion of this is outside the scope of this chapter, but you can find information at http://msdnmicrosoftcom
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