nuclex-shared-dotnet/Nuclex.Support
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Added an AsyncStarted event to the progression class, currently disabled for further consideration; set up the outline of a new spatial partitioning framework with an R*-Tree implementation; new AbortedException for indicating that a process was forcefully aborted

Browse Source 
git-svn-id: file:///srv/devel/repo-conversion/nusu@31 d2e56fa2-650e-0410-a79f-9358c0239efd
This commit is contained in:
Markus Ewald 2007-07-01 19:27:40 +00:00
parent 6d79fe3ebc
commit 1ae0c7de63
13 changed files with 511 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
Nuclex.Support (PC).csproj
View File

@ -162,6 +162,10 @@
<Name>SimpleRectanglePacker.Test</Name>
<DependentUpon>SimpleRectanglePacker.cs</DependentUpon>
</Compile>
<Compile Include="Source\Scheduling\AbortedException.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>AbortedException</Name>
</Compile>
<Compile Include="Source\Serialization\BinarySerializer.Test.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>BinarySerializer.Test</Name>
@ -179,6 +183,26 @@
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>IAbortable</Name>
</Compile>
<Compile Include="Source\SpatialPartitioning\BoundingRectangle.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>BoundingRectangle</Name>
</Compile>
<Compile Include="Source\SpatialPartitioning\RTree2.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>RTree2</Name>
</Compile>
<Compile Include="Source\SpatialPartitioning\RTreeLeaf2.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>RTreeLeaf2</Name>
</Compile>
<Compile Include="Source\SpatialPartitioning\RTreeNode2.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>RTreeNode2</Name>
</Compile>
<Compile Include="Source\SpatialPartitioning\SpatialIndex2.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>SpatialIndex2</Name>
</Compile>
<Compile Include="Source\Tracking\Internal\ObservedProgression.cs">
<XNAUseContentPipeline>false</XNAUseContentPipeline>
<Name>ObservedProgression</Name>

3
Source/Collections/UnintrusivePriorityQueue.cs
View File

@ -25,7 +25,8 @@ namespace Nuclex.Support.Collections {
/// <summary>Queue that dequeues items in order of their priority</summary>
public class UnintrusivePriorityQueue<ItemType, PriorityType>
: ICollection, IEnumerable<ItemType> where PriorityType : IComparable<PriorityType> {
: ICollection, IEnumerable<ItemType>
where PriorityType : IComparable<PriorityType> {
#region struct Entry

56
Source/Scheduling/AbortedException.cs Normal file
View File

@ -0,0 +1,56 @@
#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2007 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
namespace Nuclex.Support.Scheduling {
/// <summary>Indicates that an operation has been forcefully aborted</summary>
/// <remarks>
/// This exception is the typical result of using AsyncAbort() on a running
/// background process.
/// </remarks>
[Serializable]
public class AbortedException : ApplicationException {
/// <summary>Initializes the exception</summary>
public AbortedException() { }
/// <summary>Initializes the exception with an error message</summary>
/// <param name="message">Error message describing the cause of the exception</param>
public AbortedException(string message) : base(message) { }
/// <summary>Initializes the exception as a followup exception</summary>
/// <param name="message">Error message describing the cause of the exception</param>
/// <param name="inner">Preceding exception that has caused this exception</param>
public AbortedException(string message, Exception inner) : base(message, inner) { }
/// <summary>Initializes the exception from its serialized state</summary>
/// <param name="info">Contains the serialized fields of the exception</param>
/// <param name="context">Additional environmental informations</param>
protected AbortedException(
System.Runtime.Serialization.SerializationInfo info,
System.Runtime.Serialization.StreamingContext context
)
: base(info, context) { }
}
} // namespace Nuclex.Support.Scheduling

13
Source/Scheduling/IAbortable.cs
View File

@ -19,16 +19,23 @@ License along with this library
#endregion
using System;
using System.Collections.Generic;
using System.Text;
namespace Nuclex.Support.Tracking {
namespace Nuclex.Support.Scheduling {
/// <summary>Interface for abortable processes</summary>
public interface IAbortable {
/// <summary>Aborts the running process. Can be called from any thread.</summary>
/// <remarks>
/// The receive should honor the abort request and stop whatever it is
/// doing as soon as possible. The method does not impose any requirement
/// on the timeliness of the reaction of the running process, but implementers
/// are advised to not ignore the abort request and try to design their code
/// in such a way that it can be stopped in a reasonable time
/// (eg. within 1 second of the abort request).
/// </remarks>
void AsyncAbort();
}
} // namespace Nuclex.Support.Tracking
} // namespace Nuclex.Support.Scheduling

17
Source/Scheduling/Operation.cs
View File

@ -19,24 +19,17 @@ License along with this library
#endregion
using System;
using System.Collections.Generic;
using System.Text;
namespace Nuclex.Support.Tracking {
using Nuclex.Support.Tracking;
namespace Nuclex.Support.Scheduling {
/// <summary>Base class for observable operations running in the background</summary>
public abstract class Operation : Progression {
/// <summary>Executes the operation</summary>
/// <summary>Launches the background operation</summary>
public abstract void Start();
/// <summary>
/// Executes the operation synchronously, blocking the calling thread
/// </summary>
public virtual void Execute() {
Start();
WaitHandle.WaitOne();
}
}
} // namespace Nuclex.Support.Tracking
} // namespace Nuclex.Support.Scheduling

5
Source/Scheduling/ThreadedMethodOperation.cs
View File

@ -19,11 +19,10 @@ License along with this library
#endregion
using System;
using System.Collections.Generic;
using System.Text;
namespace Nuclex.Support.Tracking {
namespace Nuclex.Support.Scheduling {
/*
public class ThreadedMethodOperation : Operation {
}
*/
} // namespace Nuclex.Support.Tracking
} // namespace Nuclex.Support.Scheduling

78
Source/SpatialPartitioning/BoundingRectangle.cs Normal file
View File

@ -0,0 +1,78 @@
#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2007 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
namespace Nuclex.Support.SpatialPartitioning {
/// <summary>Two-dimensional bounding rectangle</summary>
internal struct BoundingRectangle {
/// <summary>Initializes a new two-dimensional bounding rectangle</summary>
/// <param name="min">Lesser coordinates of the bounding rectangle</param>
/// <param name="max">Greater coordinates of the bounding rectangle</param>
public BoundingRectangle(Vector2 min, Vector2 max) {
this.Min = min;
this.Max = max;
}
/// <summary>
/// Builds the smallest bounding rectangle that contains the two
/// specified bounding rectangle.
/// </summary>
/// <param name="original">One of the bounding rectangles to contain</param>
/// <param name="additional">One of the bounding rectangles to contain</param>
/// <returns>The resulting merged bounding rectangle</returns>
public static BoundingRectangle CreateMerged(
BoundingRectangle original, BoundingRectangle additional
) {
BoundingRectangle result;
CreateMerged(ref original, ref additional, out result);
return result;
}
/// <summary>
/// Builds the smallest bounding rectangle that contains the two
/// specified bounding rectangle.
/// </summary>
/// <param name="original">One of the bounding rectangles to contain</param>
/// <param name="additional">One of the bounding rectangles to contain</param>
/// <param name="result">The resulting merged bounding rectangle</param>
public static void CreateMerged(
ref BoundingRectangle original, ref BoundingRectangle additional,
out BoundingRectangle result
) {
result = new BoundingRectangle();
result.Min = Vector2.Min(original.Min, additional.Min);
result.Max = Vector2.Max(original.Max, additional.Max);
}
/// <summary>Coordinates of the lesser side of the bounding rectangle</summary>
public Vector2 Min;
/// <summary>Coordinates of the greater side of the bounding rectangle</summary>
public Vector2 Max;
}
} // namespace Nuclex.Support.SpatialPartitioning

95
Source/SpatialPartitioning/RTree2.cs Normal file
View File

@ -0,0 +1,95 @@
#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2007 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
namespace Nuclex.Support.SpatialPartitioning {
/// <summary>R-Tree for two-dimensional data</summary>
/// <remarks>
/// R-Trees essentially fullfill the same role that is traditionally
/// assigned to quadtrees in games. But unlike a quadtree, an R-Tree does not
/// require knowledge of the total area that is to be covered by the objects
/// that will populate the tree.
/// </remarks>
public partial class RTree2<ItemType> : SpatialIndex2 {
/// <summary>Variants of R-Tree behaviors this implementation can assume</summary>
public enum Variants {
/// <summary>
/// Insertions and deletions take linear time at the cost of degrading the
/// tree's overall performance.
/// </summary>
/// <remarks>
/// Finds the two bounding boxes with the greatest normalized separation
/// along both axes, and split along this axis. The remaining bounding boxes
/// in the node are assigned to the nodes whose covering bounding box is
/// increased the least by the addition [Gutt84]. This method takes linear time.
/// </remarks>
Linear,
/// <summary>
/// Insertions and deletions take quadratic time while keeping the tree's
/// overall performance at a reasonable level.
/// </summary>
/// <remarks>
/// Examines all the children of the overflowing node and find the pair of
/// bounding boxes that would waste the most area were they to be inserted
/// in the same node. This is determined by subtracting the sum of the areas
/// of the two bounding boxes from the area of the covering bounding box.
/// These two bounding boxes are placed in separate nodes, say j and k.
/// The set of remaining bounding boxes are examined and the bounding box i
/// whose addition maximizes the difference in coverage between the bounding
/// boxes associated with j and k is added to the node whose coverage
/// is minimized by the addition. This process is reapplied to the
/// remaining bounding boxes [Gutt84]. This method takes quadratic time.
/// </remarks>
Quadratic,
/// <summary>
/// Insertions and deletions vary in performance but the tree's overall
/// performance is kept high.
/// </summary>
/// <remarks>
/// The R*-tree [Beck90c] is a name given to a variant of the R-tree which
/// makes use of the most complex of the node splitting algorithms. The
/// algorithm differs from the other algorithms as it attempts to reduce
/// both overlap and coverage. In particular, the primary focus is on
/// reducing overlap with ties broken by favoring the splits that reduce
/// the coverage by using the splits that minimize the perimeter of the
/// bounding boxes of the resulting nodes. In addition, when a node 'a'
/// overflows, instead of immediately splitting 'a', an attempt is made
/// first to see if some of the objects in 'a' could possibly be more suited
/// to being in another node. This is achieved by reinserting a fraction
/// (30% has been found to yield good performance [Beck90c]) of these
/// objects in the tree (termed 'forced reinsertion'). The node is only split
/// if it has been found to overflow after reinsertion has taken place.
/// This method is quite complex.
/// </remarks>
RStar
}
}
} // namespace Nuclex.Geometry.SpatialPartitioning

35
Source/SpatialPartitioning/RTreeLeaf2.cs Normal file
View File

@ -0,0 +1,35 @@
#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2007 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
using System.Text;
namespace Nuclex.Support.SpatialPartitioning {
/// <summary>Leaf of an R-Tree</summary>
internal class RTreeLeaf2<ItemType> {
public BoundingRectangle BoundingRectangle;
public ItemType Item;
}
} // namespace Nuclex.Support.SpatialPartitioning

65
Source/SpatialPartitioning/RTreeNode2.cs Normal file
View File

@ -0,0 +1,65 @@
#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2007 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
using System.Diagnostics;
namespace Nuclex.Support.SpatialPartitioning {
/// <summary>Node in a two-dimensional R-Tree</summary>
/// <typeparam name="ItemType">Type of items that the R-Tree manages</typeparam>
internal class RTreeNode2<ItemType> {
/// <summary>Initializes a new R-Tree node</summary>
/// <param name="capacity">Number of items that can fit in the node</param>
public RTreeNode2(int capacity) {
this.leafs = new RTreeLeaf2<ItemType>[capacity];
}
/// <summary>Inserts an item into this node</summary>
/// <param name="item">Item to be inserted</param>
/// <param name="boundingRectangle">Bounding rectangle of the item</param>
private void insertEntry(ItemType item, BoundingRectangle boundingRectangle) {
Debug.Assert(leafCount < this.leafs.Length);
this.leafs[this.leafCount].Item = item;
this.leafs[this.leafCount].BoundingRectangle = boundingRectangle;
BoundingRectangle.CreateMerged(
ref this.boundingRectangle, ref boundingRectangle,
out this.boundingRectangle
);
}
/// <summary>The node's minimum bounding rectangle</summary>
/// <remarks>
/// This bounding rectangle is just large enough to contain all the items
/// belonging to this node and recursively all of its child nodes.
/// </remarks>
private BoundingRectangle boundingRectangle;
/// <summary>Leafs of this node</summary>
private RTreeLeaf2<ItemType>[] leafs;
/// <summary>Number of leafes in use</summary>
private int leafCount;
}
} // namespace Nuclex.Support.SpatialPartitioning

30
Source/SpatialPartitioning/SpatialIndex2.cs Normal file
View File

@ -0,0 +1,30 @@
#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2007 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
namespace Nuclex.Support.SpatialPartitioning {
/// <summary>Interface for a 2D geometrical database</summary>
public abstract class SpatialIndex2 {
}
} // namespace Nuclex.Support.SpatialPartitioning

95
Source/Tracking/Progression.cs
View File

@ -45,10 +45,13 @@ namespace Nuclex.Support.Tracking {
#region class EndedDummyProgression
/// <summary>Dummy progression which always is in the 'ended' state</summary>
internal class EndedDummyProgression : Progression {
private class EndedDummyProgression : Progression {
/// <summary>Initializes a new ended dummy progression</summary>
public EndedDummyProgression() {
#if PROGRESSION_STARTABLE
OnAsyncStarted();
#endif
OnAsyncEnded();
}
@ -67,14 +70,42 @@ namespace Nuclex.Support.Tracking {
/// <summary>will be triggered to report when progress has been achieved</summary>
public event EventHandler<ProgressUpdateEventArgs> AsyncProgressUpdated;
#if PROGRESSION_STARTABLE
/// <summary>Will be triggered when the progression has ended</summary>
public event EventHandler AsyncStarted;
#endif
/// <summary>Will be triggered when the progression has ended</summary>
public event EventHandler AsyncEnded;
#if PROGRESSION_STARTABLE
/// <summary>True when the progression has been started.</summary>
/// <remarks>
/// This is also true if the progression has been started but is already finished.
/// To find out whether the progression is running just now, use the IsRunning
/// property instead.
/// </remarks>
public bool Started {
get { return this.started; }
}
#endif
/// <summary>Whether the progression has ended already</summary>
public bool Ended {
get { return this.ended; }
}
#if PROGRESSION_STARTABLE
/// <summary>Whether the progression is currently executing.</summary>
/// <remarks>
/// This property is true when the progression is executing right at the time of
/// the call (eg. when it has been started and has not ended yet).
/// </remarks>
public bool IsRunning {
get { return (this.started && !base.Ended); }
}
#endif
/// <summary>WaitHandle that can be used to wait for the progression to end</summary>
public WaitHandle WaitHandle {
get {
@ -88,7 +119,7 @@ namespace Nuclex.Support.Tracking {
// the second one is assigned to this.doneEvent and thus gets set in the end.
if(this.doneEvent == null) {
lock(this.syncRoot) {
lock(this) {
if(this.doneEvent == null)
this.doneEvent = new ManualResetEvent(this.ended);
@ -124,20 +155,66 @@ namespace Nuclex.Support.Tracking {
copy(this, eventArguments);
}
#if PROGRESSION_STARTABLE
/// <summary>Fires the AsyncStarted event</summary>
/// <remarks>
/// <para>
/// This event should be fired once when the implementing class begins its
/// work to indicate any observers that the process is now running.
/// </para>
/// <para>
/// Calling this method is mandatory. Care should be taken that it is called
/// exactly once and that it is called before OnAsyncEnded().
/// </para>
/// </remarks>
protected virtual void OnAsyncStarted() {
// Make sure that the progression is not started more than once.
lock(this) {
// No double lock here as it would be an implementation fault if this exception
// should be triggered. There's no sense in sacrificing normal runtime speed
// for improved performance in a case that should never occur in the first place.
if(this.started)
throw new InvalidOperationException("The operation has already been started");
this.started = true;
}
// Fire the AsyncStarted event
EventHandler copy = AsyncStarted;
if(copy != null)
copy(this, EventArgs.Empty);
}
#endif
/// <summary>Fires the AsyncEnded event</summary>
/// <remarks>
/// <para>
/// This event should be fired by the implementing class when its work is completed.
/// It's of no interest to this class whether the outcome of the process was successfull
/// or not, the outcome and results of the process taking place need to be communicated
/// seperately.
/// It's of no interest to this class whether the outcome of the process was
/// successfull or not, the outcome and results of the process taking place both
/// need to be communicated seperately.
/// </para>
/// <para>
/// Calling this method is mandatory. Implementers need to take care that
/// the OnAsyncEnded() method is called on any instance of Progression that's
/// being created. This method also must not be called more than once.
/// </para>
/// </remarks>
protected virtual void OnAsyncEnded() {
// Make sure the progression is not ended more than once. By guaranteeing that
// a progression can only be ended once, we allow users of this class to
// skip some safeguards against notifications arriving twice.
lock(this.syncRoot) {
lock(this) {
// No double lock here, this is an exception that indicates an implementation
// error that will not be triggered under normal circumstances. We don't want
// to waste any effort optimizing the speed at which an implementation fault
// will be noticed.
if(this.ended)
throw new InvalidOperationException("The progression has already been ended");
@ -158,14 +235,16 @@ namespace Nuclex.Support.Tracking {
}
/// <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
/// the WaitHandle property.
/// </remarks>
private volatile ManualResetEvent doneEvent;
#if PROGRESSION_STARTABLE
/// <summary>Whether the operation has been started yet</summary>
private volatile bool started;
#endif
/// <summary>Whether the operation has completed yet</summary>
private volatile bool ended;

19
Source/WeakReference.cs
View File

@ -1,3 +1,22 @@
#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2007 Nuclex Development Labs
This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.
You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion
using System;
using System.Collections.Generic;
using System.Runtime.Serialization;