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POHow to code a good Offline-Online Dispatcher
 

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    <p>Let's assume that I have this scenario: I have got 2 repositories of information, and I want to access both, but it would be nice to leave the task of deciding which repo to use to <strong>common class</strong>. </p> <p>The goal is to accomplish this with something <strong>similar</strong> to the code I've wrote below, but this sounds pretty bad:</p> <pre><code>where TOnline : class where TOffline : class where TContract : class </code></pre> <p>Sure I can ommit that, but bassically what I'm asking is what to do in order to stop using reflection and go <strong>typed</strong>. Maybe any <em>design-pattern</em> recomendation?</p> <p>Code (if you copy/paste this on a console app replacing the <code>Program</code> class you should be able to run the example)</p> <pre><code>using CustomerDispatcher = DispatcherProxy&lt;CustomerOnline, CustomerOffline, ICustomer&gt;; public interface ICustomer { string Get(int id); } public class CustomerOnline : ICustomer { public string Get(int id) { // Get From intranet DB return "From DB"; } } public class CustomerOffline : ICustomer { public string Get(int id) { // Get From local storage return "From local storage"; } } public class DispatcherProxy&lt;TOnline, TOffline, TContract&gt; where TOnline : class where TOffline : class where TContract : class { public TContract Instance { get; set; } public bool IsConnected { get; set; } public DispatcherProxy() { // Asume that I check if it's connected or not if (this.IsConnected) this.Instance = (TContract)Activator.CreateInstance(typeof(TOnline)); else this.Instance = (TContract)Activator.CreateInstance(typeof(TOffline)); } } class Program { static void Main(string[] args) { var customerDispatcher = new CustomerDispatcher(); Console.WriteLine("Result: " + customerDispatcher.Instance.Get(1)); Console.Read(); } } </code></pre> <p>Thanks in advance!</p>
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