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When Not To Use Web Services
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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
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relatively little overhead The same applies to server applications running on the same server: Use COM or some other native API to invoke one application from the other While it s possible to use a Web service in this scenario, it is considered sub optimum and does not buy you anything Homogenous Applications on a LAN In many cases, you ll have applications developed using Visual Basic and/or Visual C++ and COM and running on Windows platforms on the same Local Area Network (LAN) For example, you might have two server applications wanting to communicate with each other or, more commonly, a Win32 or Windows Forms client that wants to communicate with its server counterpart on the same LAN It s much more efficient for two such applications to communicate using DCOM rather than SOAP/HTTP Similarly, if you have NET applications that need to communicate with one another over a LAN, you can use NET remoting Interestingly, NET remoting offers the option of using SOAP over HTTP essentially acting as a Web service But NET remoting can also utilize a binary format, instead of SOAP, for RPC calls This binary format is supposedly more efficient than using SOAP due to lower serialization/deserialization overhead You can use remoting with the binary formatter over HTTP or directly over TCP Using HTTP as the transport allows you to use remoting through firewalls while using TCP is supposed to yield better performance Again, you would not use Web services in a scenario where you had other viable options that are more efficient or make more sense from an application architecture viewpoint This means if you have a scenario where it is feasible to use NET remoting with the binary formatter over TCP, that s what you should use
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Summary
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Web services are a new, standard platform for building interoperable distributed applications The main thrust behind Web services is cross-platform interoperability To achieve this, the Web services platform relies heavily on vendor and platform-neutral standards such as XML and XSD Web services offer tremendous value in scenarios that involve applications communicating across platform boundaries and over the Internet Web service applications include application integration, business-tobusiness integration, code and data reuse, and facilitating communication between client and server over the Web However, Web services are no silver bullet and you should not use them just because you can There are certain scenarios where using Web services will cost you performance without buying you anything For example, homogenous applications running on the same machine or on different machines on the same LAN should not use Web services to communicate with one another The next chapters will explore the technologies that make up the Web services platform beginning with the Web service type system based on XML and XSD
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[1] To make Windows clients a viable alternative, the deployment problem must also be solved Fortunately, NET Windows Forms provide a solution to this problem Now the problem becomes getting the NET framework on every desktop! [2] There are two NET technologies that let yoy expose components to remote clients via Web services: ASPNET Web services and NET Remoting ASPNET Web services is more messaging oriented (by default) while Remoting is RPC oriented [3] The OASIS Web Services for Remote Portals Technical Committee (WSRP) is in charge of defining an XML and Web services standard that will allow the plug and play of Web services that emit user interface rather than raw data For more information see http://wwwoasis-openorg/committees/wsrp
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