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CHAPTER 11 s WEB SERVICES INTERFACE
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Designing a Web Services Interface
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In many ways, a Web Services interface is easier to construct than a Windows Forms or Web Forms interface because there s no need to worry about any issues of display or user interaction. Those are the responsibility of the calling application. All the web service needs to worry about is providing an interface that allows the developer of a consumer application to access the information and functionality provided by this application s business logic and data. In designing a web service, the following four primary issues must be addressed: Whether to use a component-based or service-oriented design How to organize the web methods into classes What data to expose and accept How to handle authentication
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Component-Based vs. Service-Oriented Design
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I ve already provided a high-level overview of these two models, and as I stated earlier in the chapter, I ll demonstrate both. In your applications, I recommend that you choose one model or the other and use it consistently, as that will provide a Web Services interface that is much easier to understand and consume. It s possible to subdivide the ProjectTracker application s functionality in many different ways. For example, you could be very specific and provide a set of discrete services, such as those listed in Table 11-2. Table 11-2. Possible Web Methods Add project Change project start date Remove resource Get list of resources Add project to resource Get project Change project end date Change resource first name Change project description Remove project from resource Remove project Add resource Change resource last name Add resource to project Change role of resource on project Change project name Get resource Get list of projects Remove resource from project and so on . . .
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Following this approach, you could end up writing a rather large number of web methods! Although it s perfectly possible to do that, you might instead consider consolidating some of these operations into web methods with broader functionality, as follows: Get a list of projects Get details for a project Add or update a project Delete a project Get a list of resources Get details for a resource Add or update a resource Delete a resource
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CHAPTER 11 s WEB SERVICES INTERFACE
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This is a smaller list of discrete operations, and by having fewer operations, there s less code to maintain. Moreover, this approach provides a higher level of abstraction a consumer has no idea what happens when it requests details for a project, and over time you may change how that process works without having any impact on the consumers. Perhaps most importantly, having a small number of operations tends to improve performance, since a client application needs to make fewer cross-network method calls to get its work done. The web methods implemented in this chapter fall into two categories. Those designed with a component-based approach are AddProject() EditProject() ChangeResource() AssignResource() Those designed with a service-oriented, message-based approach are GetProjectList() GetProject() GetResourceList() GetResource() This should give you an idea of how both are handled.
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Under the .NET Framework, web methods are grouped together within a URL such as http:// server/root/projecttracker.asmx, where projecttracker.asmx is the page or file that contains a class in the web service. Within a given virtual root on a given web server, there can be any number of such web service classes, each with its own set of web methods. This, then, is a decision point in the design: should you put all the web methods into a single web service class, or put each web method in its own web service class, or something in between Unfortunately, there s no hard-and-fast rule to guide the decision. In this context, one way to view a web service is as a component that happens to be accessed via Internet technologies. A component is a container for similar groupings of functionality (COM or .NET components typically contain a group of related classes), so likewise a web service component should contain a group of related web methods. Of course, all the functionality in an application is related in some way; the question is whether it should be broken into multiple web services perhaps one for project-related tasks and one for resource-related tasks. However, there s another angle to this question that you need to consider before making a decision, and that s the consumer. Consumers don t reference an entire virtual root; they reference a specific web service (asmx file). The more granular you make the web service classes, the more different references the developer or the consumer will need to make in order to use the web methods. Because of this, I prefer to group related web methods into web service classes based on the likely usage pattern of consumer developers. Since the web methods will all be related within the context of the ProjectTracker application, I m following basic component design concepts; and since the web services are an interface to the application, I m also taking into account the needs of the end user (the consumer application developer). For the ProjectTracker sample application, this means putting all the web methods into a single web service class. They are all related to each other, so they naturally fit into a component.
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