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POcreating WCF ChannelFactory<T>
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  1. POcreating WCF ChannelFactory<T>
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    copied!<p>I'm trying to convert an existing .NET Remoting application to WCF. Both server and client share common interface and all objects are server-activated objects.</p> <p>In WCF world, this would be similar to creating per-call service and using <code>ChannelFactory&lt;T&gt;</code> to create a proxy. I'm struggling a bit with how to properly create <code>ChannelFactory&lt;T&gt;</code> for an ASP.NET client. </p> <p>For performance reasons, I want to cache <code>ChannelFactory&lt;T&gt;</code> objects and just create channel every time I call the service. In .NET remoting days, there used to be <code>RemotingConfiguration.GetRegisteredWellknownClientTypes()</code> method to get a collection of client objects that I could then cache. It appears, in WCF world there is no such thing, although I was able to get a collection of endpoints from config file.</p> <p>Now here is what I think will work. I can create something like this:</p> <pre><code>public static ProxyHelper { static Dictionary&lt;Type, object&gt; lookup = new Dictionary&lt;string, object&gt;(); static public T GetChannel&lt;T&gt;() { Type type = typeof(T); ChannelFactory&lt;T&gt; factory; if (!lookup.ContainsKey(type)) { factory = new ChannelFactory&lt;T&gt;(); lookup.Add(type, factory); } else { factory = (ChannelFactory&lt;T&gt;)lookup[type]; } T proxy = factory.CreateChannel(); ((IClientChannel)proxy).Open(); return proxy; } } </code></pre> <p>I think the above code will work, but I'm a bit worried about multiple threads trying to add new <code>ChannelFactory&lt;T&gt;</code> objects if it's not in the lookup. Since I'm using .NET 4.0, I was thinking about using <code>ConcurrentDictionary</code> and use <code>GetOrAdd()</code> method or use <code>TryGetValue()</code> method first to check if <code>ChannelFactory&lt;T&gt;</code> exists and it does not exist, then use <code>GetOrAdd()</code> method. Not sure about performance though of <code>ConcurrentDictionary.TryGetValue()</code> and <code>ConcurrentDictionary.GetOrAdd()</code> method.</p> <p>Another minor question is whether I need to call <code>ChannelFactory.Close()</code> method on channel factory objects after ASP.NET application ends or can I just let .NET framework dispose the channel factory objects on its own. The proxy channel will always be closed after calling service method by using <code>((IChannel)proxy).Close()</code> method.</p>
 

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