Csharp/C Sharp/Generics/Generic Parameters

Two Generic parameters

<source lang="csharp"> using System; using System.Collections.Generic; using System.Text; using System.Threading; public interface IDocument {

   string Title {
       get;
   }
   string Content {
       get;
   }

} public class Document : IDocument {

   private string title;
   public string Title {
       get {
           return title;
       }
   }
   private string content;
   public string Content {
       get {
           return content;
       }
   }
   public Document(string title, string content) {
       this.title = title;
       this.content = content;
   }

} public class ProcessDocuments<T, U>

   where T : IDocument
   where U : IDocumentManager<T> {
   public static void Start(U dm) {
       new Thread(new ThreadStart(new ProcessDocuments<T, U>(dm).Run)).Start();
   }
   protected ProcessDocuments(U dm) {
       documentManager = dm;
   }
   private U documentManager;
   protected void Run() {
       while (true) {
           if (documentManager.IsDocumentAvailable) {
               T doc = documentManager.GetDocument();
               Console.WriteLine("Processing document {0}", doc.Title);
           }
           Thread.Sleep(new Random().Next(20));
       }
   }

} public interface IDocumentManager<T> {

   void AddDocument(T doc);
   T GetDocument();
   bool IsDocumentAvailable {
       get;
   }

} public class DocumentManager<T> : IDocumentManager<T> {

   private readonly Queue<T> documentQueue = new Queue<T>();
   public void AddDocument(T doc) {
       lock (this) {
           documentQueue.Enqueue(doc);
       }
   }
   public T GetDocument() {
       T doc = default(T);
       lock (this) {
           doc = documentQueue.Dequeue();
       }
       return doc;
   }
   public bool IsDocumentAvailable {
       get {
           return (documentQueue.Count > 0) ? true : false;
       }
   }

} class Program {

   static void Main(string[] args) {
       DocumentManager<Document> dm = new DocumentManager<Document>();
       ProcessDocuments<Document, DocumentManager<Document>>.Start(dm);
       for (int i = 0; i < 1000; i++) {
           Document doc = new Document("Doc " + i.ToString(), "content");
           dm.AddDocument(doc);
           Console.WriteLine("added document {0}", doc.Title);
           Thread.Sleep(new Random().Next(20));
       }
   }

}

</source>