WCF operation to post logs - should it be callback?

WCF contains Server and Client side In my case Server is the program that produces data (logs). There are several subscribers that should be notified when a new bunch of data is ready to开发者_运维知识库 be posted.

So I think WCF Server should callback some method for all interested clients....

Should I use "CallbackContract" keyword to define one-way callback operation?

I need is void Log(string) method which will be called by server for all clients every time something should be possted, how to define such method in terms of WCF?

probably I should avoid "callback" but instead use string[] getLogs() method which will return new logs? then client may call getLogs method every one or two or three seconds to get logs for the last interval?

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What you described looks like Publisher/Subscriber pattern. Check this out: http://blogs.msdn.com/b/tomholl/archive/2008/05/17/building-a-pub-sub-message-bus-with-wcf-and-msmq.aspx

There are also specialized frameworks, like NServiceBus that solve broader problem of asynchronous messaging.

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what you are asking sounds reasonable, have a look at this one: WCF Callbacks; a beginners guide