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Cross-Process on Multiple Machines in a LAN
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OK, now we start to get real. This is your usual distributed LAN application. Applications of this kind can be separated into two additional categories:
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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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Single-server applications Applications that need to scale to multiple hosts in a network load balancing (NLB) cluster
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Don t Use Events or Callbacks
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No matter which category your application belongs to, I heavily recommend not using events, callbacks, or client-side sponsors for networked applications. Yes, it s possible to use them. Yes, they might work after applying one or another workaround. The real trouble is that they aren t exactly stable and don t really perform that nicely. The reason for this stability/performance drawback lies in the invocation model. First, you have to make a decision on whether to invoke events synchronously or asynchronously from the server s point of view. In the first case, your server has to wait until all clients acknowledge (and process) the callback, which increases the request time by a magnitude. If, however, you decide to use them asynchronously, you might run into a number of different issues of which ThreadPool starvation is only the smallest and lost events is the more critical. But what if you need notification of clients In this case, you should either look into User Datagram Protocol (UDP) or message queuing, depending on your need for reliability. The use of Microsoft Message Queue Server (MSMQ) allows your server-side application to send messages to listening clients without having to wait for acknowledgements of reception (or even wait for processing at the client). This allows for way better turnaround times for your requests. I will cover asynchronous notifications in more depth later in this chapter in the section Using Events and Sponsors.
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How About Client-Activated Objects
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The main problem with CAOs is that they are always bound to the machine on which they have been created. This means that you can t use load balancing or failover clustering for these objects. If, on the other hand, you use SingleCall SAOs designed with clustering in mind, you could use Windows Network Load Balancing (NLB) quite easily to randomly dispatch the method invocations to one out of a number of available servers. If you are running a single-server application, this doesn t matter too much for you. If, however, there is the slightest chance that the application has to scale out to a server-side cluster, than CAOs might limit its scalability. But you shouldn t just be concerned about scalability: CAOs also affect you on a single server. When running SingleCall SAOs (and when strictly keeping all state information in a database), you can shut down and restart your server on demand. For example, you could upgrade to a newer version or apply some bug fix without having to tell any user to close and restart your client-side application. As soon as you use CAOs, however, you instantly lose this feature. If you restart a server in which you host CAOs, the client application will receive exceptions when calling any methods on these objects. CAOs aren t restored after restarting your server. Don t use them if you care about high availability and transparent failover, unless you want to write these features yourself. I ll talk about clustering in more depth later in this chapter in the section Scaling Out Remoting Solutions.
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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
What s the Best Channel/Formatter
I recommend the use of the HttpChannel with the binary formatter for any application that spans multiple hosts. The reason is quite simple: you can develop and debug your application in a standard Visual Studio .NET project, but when it comes to deployment, you can easily host your server-side components in IIS, which provides you with a number of advantages a reasonable process model, built-in authentication (HTTP Basic or Windows integrated), built-in encryption (SSL), and the ability to disable HTTP KeepAlives, which further increases the scalability of your application because it reduces dependencies on single servers.
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