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To update a classic Windows application, you need to somehow get a new version of the program onto the end users machines. Since it s rarely practical to install a new version on every single user s machine simultaneously, you need to handle the possibility of having several different versions of the client software all trying to talk to your server. The extent to which this can cause problems will depend on how much control you have over the client computers.

Some applications are deployed in tightly controlled environments. For example, suppose you re writing a line-of-business application in WPF that will only ever be deployed to machines owned by your business. If your IT department has an iron grip on the company s computers, you might be able to exert considerable control over what versions of your application are out there. Network administrators could forcibly upgrade users to the latest version. So new versions might overlap with old versions for only a day or so. You could even go further and arrange for your application to check for updates and refuse to continue running when a newer version is available. This is a happy situation for a developer, because it makes it much easier to introduce changes to your server. Chances are that at some point you ll want to add new services to support new features in your application. You might also want to modify existing services, which is usually more problematic than completely new features if you re using WCF, it s not easy to modify the way an existing service works without breaking that service for older clients. It s possible, but it s hard, and it s often easier to run multiple versions of the service simultaneously during the transition period. The nice thing about having sufficient control to remove old versions of the application is that you can know when you ve reached the end of a transition period and can shut down the older version of the service. This won t be the case if you can t force that sort of change on the client.

Before we go explore the NIS utilities, you need to understand how NIS manages information on its databases for distribution. This is through the use of maps.

If your application s customers don t all work for your company, life becomes more complex, because it s harder to force upgrades on your customers It s not impossible for example, Microsoft s Windows Live Messenger program occasionally tells you that if you don t upgrade you won t be able to carry on using the service Mind you, it s a free service, so it gets to dictate its terms of use; you might find that paying customers won t put up with that, insisting that the product they ve bought carries on working without needing to install regular upgrades The implication is that you might need to support old versions of your service indefinitely At this point, WCF might not look like such a good choice.

One of the attractive features of WCF is that it does a lot of work for you under the covers, but that s a double-edged sword it works really well when both ends of the connection evolve simultaneously, but it can become a burden over time if the two ends do not move forward in tandem If you want a service to be able to evolve while the client does not, you end up needing to understand exactly how WCF presents your service, and how the changes you have in mind might affect its operation.

For example, if you decide that a method in your service requires an extra argument, what happens when an old client invokes the operation without that new argument In practice, it might actually be easier just to work directly with HTTP and XML, because that way you have complete control over what messages go across the network That s not to say that WCF is definitely the wrong choice here You could deal with the problem described by maintaining multiple versions of the service, or by dropping down to WCF s lower-level messaging API, for example But the trade-off between WCF and HTTP is altered by the nature of your deployment In a tightly controlled deployment, WCF is likely to be a good choice, but when you have less control, the lower-level APIs can start to look like they re worth the extra effort.

Maps in NIS are the set of files that contain information about an NIS domain. These files hold information about passwords, groups, networks, hosts, protocols, services, aliases and ethers for Ethernet addresses. These map files are contained in a directory named after the NIS domain in the NIS database directory. In our current setup, the NIS server s database directory has a subdirectory called toysdomain that holds the map files for the toysdomain NIS domain. If you look at the contents of the /var/yp/toysdomain directory, you will see a set of files similar to Figure 16-7.