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.NET Forum / .NET Framework / Component Services / January 2004Remoting from Windows Service
Does someone have a design pattern for an singleton object, published by a Windows Service, that can be used to provide control over the service? Things such as configuration parameters. It would be nice if the remoted object instance in the could call functions in the service class (set/get your config parameters, for example), but of course that visibility is not there (the service is an EXE and can not be brought in to project reference for the remoted class, which is in a separate DLL). I can see how the service might call methods on the remoted object, but I can not see how to get activity to occur in the service, which are based on some activity a client initiated through method calls on the remote object. Maybe there is a good sample you know of. Best regards, Lee Gillie, Spokane, WA > Things such as configuration parameters. It would be nice if the > remoted object instance in the could call functions in the service [quoted text clipped - 5 lines] > service, which are based on some activity a client initiated through > method calls on the remote object. There is an example recently posted to planetsourcecode that does exactly this. In a nutshell, the service instantiates the object and provides it to RemotingServices to be marshalled. This means the service can keep a reference to it, allowing it to respond to events that the object may raise, or allowing the object to call private methods on types present in the service to perform functions on behalf of remote callers. The core of this type of implementation is that the type being remoted (located in a shared DLL) is actually an abstract class; the implementation of the remote object is done by creating a real class inside the service that inherits from the abstract class and performs the work. I have implemented something very similar to this, but I have one problem that I haven't quite solved. My client(s) get a reference to the service-hosted remote object. But, I am having a real problem figuring a (fast) way to determine when the service is stopped (or the machine is rebooted, power fails, etc). of course, I will eventually (after several seconds) trap the "The underlying connection was closed: Unable to connect to the remote server" error, but is there any way to do this more efficiently? Any ideas would be most appreciated! Thanks, Joe > > Things such as configuration parameters. It would be nice if the > > remoted object instance in the could call functions in the service [quoted text clipped - 19 lines] > inside the service that inherits from the abstract class and performs > the work. > My client(s) get a reference to the service-hosted remote object. But, I am > having a real problem figuring a (fast) way to determine when the service is > stopped (or the machine is rebooted, power fails, etc). of course, I will > eventually (after several seconds) trap the "The underlying connection was > closed: Unable to connect to the remote server" error, but is there any way > to do this more efficiently? I can't think of any better way, but I don't have a lot of experience at this. However, both of the supplied channels use TCP as their underlying mechanism, so theoretically when the service is shutdown gracefully the open TCP socket will receive a "disconnect" from the server. Whether that's visible at any higher layers and can be acted upon... no idea. Most likely a third-party channel could provide a solution to this problem (I've look at the GenuineChannels stuff and it looks nice, but it's overkill for my application). Hi, I recently did a similar project and I had the same problem, ie clients could not know if the server is up with its remoted objects. Unfortunatly I could not find anything on how to do it 'properly'. So I have the clients trying to call a method on the server every few minites. If the server is not up then tcp will throw an exception "host actively refused the connection" which means no one is listening on the port on the server side. Also after a method call the tcpchannel will be up only for a short "unused" time. ie if you dont call your method frequent the tcpchannel will drop. Note that if you have a callback object then u will see that the client is creating a listener socket (remoting level) on the just failed method call socket. Use tcpview to see this.. weird.. i had a case where the GC was not collecting these objects..freaky stuff.. - George. > > My client(s) get a reference to the service-hosted remote object. But, I am > > having a real problem figuring a (fast) way to determine when the service is [quoted text clipped - 12 lines] > problem (I've look at the GenuineChannels stuff and it looks nice, but > it's overkill for my application).
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