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Method Invocations and Event Management with .NET Remoting
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Lesson 3: Implementing and Responding to Events
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So far, we ve focused on how to remote objects and their respective methods across boundaries. One more area needs to be discussed to complete our discussion of remoting: events. Any responsible discussion of remoting and events invariably con tains quite a few cautions. In many cases, the discussion contains a lot more informa tion about avoiding events in remoting scenarios than it does on how to use them. Let s be clear about this: There are definitely times when using events with remoting is helpful or necessary, but those times are very few and very specific. It s entirely plausible that a developer could use remoting extensively and never come across a need to handle server-side events. A few cautionary notes about remoting events are provided in the following list:
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The typical use case for remoting events is in scenarios where different applica tions are running, applications that reference each other and are running on the same machine. Because events are only useful when listeners are wired up to respond to them, scalability is seriously decreased as the number of listeners increases. This limi tation means that an application that performs well with, for instance, 10 clients might come to a crashing halt when 30 clients are added. Due to the number of different variables that can affect this, it s next to impossible to determine the breaking point in advance. If you know an application will be distributed to mul tiple clients, using events is ill-advised. Listening to events involves a server component being coupled with a client component and vice versa. This arrangement makes the application very suscep tible to failures outside of the application. The only responsible way to address this is through complex and sophisticated exception handling. This exception handling greatly complicates the code and makes maintenance much more dif ficult. Any point on the network might fail (such as the switch, the server, or the net work card); however, the client is not necessarily notified of this failure. If the cli ent application makes infrequent calls to the server this failure can be particularly problematic. The client application might be expecting notifications for events, yet the server is no longer responding. The latency between the server failure and client notification can be very troublesome. There are solutions, such as polling, but these all entail an additional layer of complexity that greatly com plicates the code logic and makes maintenance much more difficult.
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Lesson 3: Implementing and Responding to Events
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If the OneWay attribute is used, the client is not notified of any failures on the server. With events, these calls might be frequent and each time an event is raised, the server tries to contact each of the listening machines. If these machines are no longer running, the server tries to contact them nonetheless. These attempts can cause a huge resource leakage. Code Access Security does not work across process boundaries. This limitation raises many security concerns that are often rather difficult to properly address.
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After this lesson, you will be able to:
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Wire a client to listen for remote events.
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Estimated lesson time: 45 minutes
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Handled Remote Events
Throughout the discussion of .NET Remoting, it s been pointed out that in many ways dealing with remote objects is very similar to dealing with their nonremote counterparts. At the same time, the discussion has highlighted the differences. Event handling in .NET Remoting definitely falls into the same-but-different category. It s the same as traditional event management in the semantic sense, as far as the code is concerned, and it appears to be done the same way other event management is. But it s different in the underlying mechanics. Intuitively, if you wanted to add an event handler, you would assume that you could do something like the following:
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