Moved licensing classes to proper namespace; rethought the progression result design (removed outcome reporting entirely); Began implementation of a progression set class for grouping progressions

git-svn-id: file:///srv/devel/repo-conversion/nusu@10 d2e56fa2-650e-0410-a79f-9358c0239efd

Nuclex.Support (PC).csproj

@@ -131,9 +131,9 @@
       <XNAUseContentPipeline>false</XNAUseContentPipeline>
       <Name>IAbortable</Name>
     </Compile>
-    <Compile Include="Source\Tracking\MultiProgression.cs">
+    <Compile Include="Source\Tracking\SetProgression.cs">
       <XNAUseContentPipeline>false</XNAUseContentPipeline>
-      <Name>MultiProgression</Name>
+      <Name>SetProgression</Name>
     </Compile>
     <Compile Include="Source\Tracking\Operation.cs">
       <XNAUseContentPipeline>false</XNAUseContentPipeline>
@@ -155,6 +155,14 @@
       <XNAUseContentPipeline>false</XNAUseContentPipeline>
       <Name>ThreadedMethodOperation</Name>
     </Compile>
+    <Compile Include="Source\Tracking\WeightedProgression.cs">
+      <XNAUseContentPipeline>false</XNAUseContentPipeline>
+      <Name>WeightedProgression</Name>
+    </Compile>
+    <Compile Include="Source\Tracking\WeightedProgressionCollection.cs">
+      <XNAUseContentPipeline>false</XNAUseContentPipeline>
+      <Name>WeightedProgressionCollection</Name>
+    </Compile>
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="$(MSBuildExtensionsPath)\Microsoft\XNA\Game Studio Express\v1.0\Microsoft.Xna.ContentPipeline.targets" />

Source/Licensing/LicenseKey.Test.cs

@@ -5,7 +5,7 @@ using System.Collections;
 
 using NUnit.Framework;
 
-namespace Nuclex.Licensing {
+namespace Nuclex.Support.Licensing {
 
   /// <summary>Unit test for the license key class</summary>
   [TestFixture]
@@ -70,6 +70,6 @@ namespace Nuclex.Licensing {
 
   }
 
-} // namespace Nuclex.Licensing
+} // namespace Nuclex.Support.Licensing
 
 #endif // UNITTEST

Source/Licensing/LicenseKey.cs

@@ -3,7 +3,7 @@ using System.Collections;
 using System.IO;
 using System.Text;
 
-namespace Nuclex.Licensing {
+namespace Nuclex.Support.Licensing {
 
   /// <summary>Typical license key with 5x5 alphanumerical characters</summary>
   /// <remarks>
@@ -225,4 +225,4 @@ namespace Nuclex.Licensing {
 
   }
 
-} // namespace Nuclex.Licensing
+} // namespace Nuclex.Support.Licensing

Source/Tracking/MultiProgression.cs

@@ -1,12 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace Nuclex.Support.Tracking {
-
-  public class MultiProgression<ProgressionType> : Progression
-    where ProgressionType : Progression {
-
-  }
-
-} // namespace Nuclex.Support.Tracking

Source/Tracking/Operation.cs

@@ -7,44 +7,9 @@ namespace Nuclex.Support.Tracking {
   /// <summary>Base class for observable operations running in the background</summary>
   public abstract class Operation : Progression {
 
-    /// <summary>Possible outcomes of an operation</summary>
-    public enum Outcomes {
-      /// <summary>The operation has not ended yet</summary>
-      Pending,
-      /// <summary>The operation has succeeded</summary>
-      Success,
-      /// <summary>The operation has failed</summary>
-      Failure,
-    }
-/*
-    /// <summary>Begins executing the operation</summary>
-    public abstract void BeginExecute();
+    /// <summary>Executes the operation</summary>
+    public abstract void Execute();
 
-    public virtual void Execute() {
-      try {
-        BeginExecute();
-        this.outcome = EndExecute();
-      }
-      catch(Exception exception) {
-         this.outcome = Outcomes.Failure;
-      }
-    }
-
-    /// <summary>Ends the </summary>
-    public virtual Outcomes EndExecute() {
-      WaitHandle.WaitOne();
-
-      return this.outcome;
-    }
-
-    /// <summary>The Outcome of the operation when it has finished</summary>
-    public Outcomes Outcome {
-      get { return this.outcome; }
-    }
-
-    /// <summary>Outcome of the operation</summary>
-    protected Outcomes outcome;
-*/
   }
 
 } // namespace Nuclex.Support.Tracking

Source/Tracking/Progression.cs

@@ -10,13 +10,13 @@ namespace Nuclex.Support.Tracking {
   ///     a background thread in a class that's derived from Progression you can wait
   ///     for the completion of the operation and receive feedback on the achieved
   ///     progress. This is useful for displaying a progress bar, loading screen or
-  ///     some means of entertaining the user while he waits for the operation to
+  ///     some other means of entertaining the user while he waits for the operation to
   ///     complete. It is also possible to register callbacks which will be fired once
   ///     the progression has ended.
   ///   </para>
   ///   <para>
-  ///     This class deliberately does not provide an Execute() or similar method to
-  ///     clearly seperate the initiation of an operation from just monitoring it.
+  ///     This class deliberately does not provide an Execute() method or anything similar
+  ///     to clearly seperate the initiation of an operation from just monitoring it.
   ///     By omitting an Execute() method, it also becomes possible to construct a
   ///     progression just-in-time when it is explicitely asked for.
   ///   </para>
@@ -53,20 +53,27 @@ namespace Nuclex.Support.Tracking {
 
     /// <summary>Whether the progression has ended already</summary>
     public virtual bool Ended {
-      get { return ended; }
+      get { return this.ended; }
     }
 
     /// <summary>WaitHandle that can be used to wait for the progression to end</summary>
     public WaitHandle WaitHandle {
       get {
-        lock(this) {
         
         // The WaitHandle will only be created when someone asks for it!
+        // See the Double-Check Locking idiom on why the condition is checked twice
+        // (primarily, it avoids an expensive lock when it isn't needed)
+        if(this.doneEvent == null) {
+
+          lock(this.syncRoot) {
+
             if(this.doneEvent == null)
               this.doneEvent = new ManualResetEvent(this.ended);
 
           }
 
+        }
+
         return this.doneEvent;
       }
     }
@@ -102,9 +109,9 @@ namespace Nuclex.Support.Tracking {
     ///   seperately.
     /// </remarks>
     protected virtual void OnAsyncEnded() {
-      lock(this) {
-        ended = true;
+      this.ended = true;
 
+      lock(this.syncRoot) {
         if(this.doneEvent != null)
           this.doneEvent.Set();
       }
@@ -114,6 +121,8 @@ namespace Nuclex.Support.Tracking {
         copy(this, EventArgs.Empty);
     }
 
+    /// <summary>Used to synchronize multithreaded accesses to this object</summary>
+    private object syncRoot = new object();
     /// <summary>Event that will be set when the progression is completed</summary>
     /// <remarks>
     ///   This event is will only be created when it is specifically asked for using

Source/Tracking/SetProgression.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+
+using Nuclex.Support.Collections;
+
+namespace Nuclex.Support.Tracking {
+
+  /// <summary>Forms a single progression from a set of progressions</summary>
+  /// <typeparam name="ProgressionType">Type of progressions to manage as a set</typeparam>
+  public class SetProgression<ProgressionType> : Progression
+    where ProgressionType : Progression {
+
+
+    // TODO
+
+  }
+  /*
+    public class SetOperation<OperationType> : Operation
+      where OperationType : OperationType
+ 
+    QueueOperation
+  */
+
+} // namespace Nuclex.Support.Tracking

Source/Tracking/ThreadedMethodOperation.cs

@@ -3,8 +3,8 @@ using System.Collections.Generic;
 using System.Text;
 
 namespace Nuclex.Support.Tracking {
-
+/*
   public class ThreadedMethodOperation : Operation {
   }
-
+*/
 } // namespace Nuclex.Support.Tracking

Source/Tracking/WeightedProgression.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Nuclex.Support.Tracking {
+
+  /// <summary>Progression with an associated weight for the total progress</summary>
+  internal class WeightedProgression<ProgressionType> : IDisposable
+    where ProgressionType : Progression {
+
+    /// <summary>Initializes a new weighted progression</summary>
+    /// <param name="callback">Callback to pass progress updates on to</param>
+    /// <param name="progression">Progression whose progress to monitor</param>
+    /// <param name="weight">Weighting of the progression's progress</param>
+    public WeightedProgression(
+      ProgressionType progression,
+      EventHandler<ProgressUpdateEventArgs> callback,
+      float weight
+    ) {
+      this.progression = progression;
+      this.weight = weight;
+      this.callback = callback;
+
+      progression.AsyncProgressUpdated += new EventHandler<ProgressUpdateEventArgs>(
+        asyncProgressUpdated
+      );
+    }
+
+    /// <summary>Disposes of the resources used by this instance immediately</summary>
+    public void Dispose() {
+      if(this.progression != null) {
+        progression.AsyncProgressUpdated -= new EventHandler<ProgressUpdateEventArgs>(
+          asyncProgressUpdated
+        );
+        this.progression = null;
+      }
+
+    }
+
+    /// <summary>Progression being wrapped by this weighted progression</summary>
+    public ProgressionType Progression {
+      get { return this.progression; }
+    }
+
+    /// <summary>Progress this progression has achieved so far</summary>
+    public float Progress {
+      get { return this.progress; }
+    }
+
+    /// <summary>The weighting of this progression in the total progress</summary>
+    public float Weight {
+      get { return this.weight; }
+    }
+
+    /// <summary>Handles progress reports by the progression</summary>
+    /// <param name="sender">Progression that has made progress</param>
+    /// <param name="e">Contains the currently achieved progress</param>
+    private void asyncProgressUpdated(object sender, ProgressUpdateEventArgs e) {
+      this.progress = e.Progress;
+      this.callback(sender, e);
+    }
+
+    /// <summary>Progression whose progress we're tracking</summary>
+    private ProgressionType progression;
+    /// <summary>Callback to which any progress reports will be passed on</summary>
+    private EventHandler<ProgressUpdateEventArgs> callback;
+    /// <summary>Most recent progress reported by the progression</summary>
+    private volatile float progress;
+    /// <summary>Weighting of this progression in the total progress</summary>
+    private float weight;
+
+  }
+
+} // namespace Nuclex.Support.Tracking

Source/Tracking/WeightedProgressionCollection.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using Nuclex.Support.Collections;
+
+namespace Nuclex.Support.Tracking {
+
+  internal class WeightedProgressionCollection<ProgressionType>
+    : ObservableCollection<WeightedProgression<ProgressionType>>
+    where ProgressionType : Progression { }
+
+} // namespace Nuclex.Support.Tracking