Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Framework / MS / Internal / Data / AccessorTable.cs / 1 / AccessorTable.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description: Mapping of (SourceValueType, type, name) to (info, propertyType, args)
//
//---------------------------------------------------------------------------
/***************************************************************************\
Data binding uses reflection to obtain accessors for source properties,
where an "accessor" can be a DependencyProperty, a PropertyInfo, or a
PropertyDescriptor, depending on the nature of the source item and the
property. We cache the result of this discovery process in the
AccessorTable; table lookup is cheaper than doing reflection again.
\***************************************************************************/
using System;
using System.Collections;
using System.ComponentModel; // IBindingList
using System.Reflection; // TypeDescriptor
using System.Windows; // SR
using System.Windows.Threading; // Dispatcher
using MS.Internal; // Invariant.Assert
namespace MS.Internal.Data
{
internal sealed class AccessorInfo
{
internal AccessorInfo(object accessor, Type propertyType, object[] args)
{
_accessor = accessor;
_propertyType = propertyType;
_args = args;
}
internal object Accessor { get { return _accessor; } }
internal Type PropertyType { get { return _propertyType; } }
internal object[] Args { get { return _args; } }
internal int Generation { get { return _generation; } set { _generation = value; } }
object _accessor; // DP, PD, or PI
Type _propertyType; // type of the property
object[] _args; // args for indexed property
int _generation; // used for discarding aged entries
}
internal sealed class AccessorTable
{
internal AccessorTable()
{
}
// map (SourceValueType, type, name) to (accessor, propertyType, args)
internal AccessorInfo this[SourceValueType sourceValueType, Type type, string name]
{
get
{
if (type == null || name == null)
return null;
AccessorInfo info = (AccessorInfo)_table[new AccessorTableKey(sourceValueType, type, name)];
if (info != null)
{
#if DEBUG
// record the age of cache hits
int age = _generation - info.Generation;
if (age >= _ages.Length)
{
int[] newAges = new int[2*age];
_ages.CopyTo(newAges, 0);
_ages = newAges;
}
++ _ages[age];
++ _hits;
#endif
info.Generation = _generation;
}
#if DEBUG
else
{
++ _misses;
}
#endif
return info;
}
set
{
if (type != null && name != null)
{
value.Generation = _generation;
_table[new AccessorTableKey(sourceValueType, type, name)] = value;
if (!_cleanupRequested)
RequestCleanup();
}
}
}
// request a cleanup pass
private void RequestCleanup()
{
_cleanupRequested = true;
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.ContextIdle, new DispatcherOperationCallback(CleanupOperation), null);
}
// run a cleanup pass
private object CleanupOperation(object arg)
{
// find entries that are sufficiently old
object[] keysToRemove = new object[_table.Count];
int n = 0;
IDictionaryEnumerator ide = _table.GetEnumerator();
while (ide.MoveNext())
{
AccessorInfo info = (AccessorInfo)ide.Value;
int age = _generation - info.Generation;
if (age >= AgeLimit)
{
keysToRemove[n++] = ide.Key;
}
}
#if DEBUG
if (_traceSize)
{
Console.WriteLine("After generation {0}, removing {1} of {2} entries from AccessorTable, new count is {3}",
_generation, n, _table.Count, _table.Count - n);
}
#endif
// remove those entries
for (int i=0; i 0)
{
cumulativeHits += _ages[i];
Console.WriteLine("{0,5} {1,6} {2,5} {3,5}",
i, _ages[i], 100*_ages[i]/_hits, 100*cumulativeHits/_hits);
}
}
#endif
}
internal bool TraceSize
{
get { return _traceSize; }
set { _traceSize = value; }
}
private const int AgeLimit = 10; // entries older than this get removed.
private Hashtable _table = new Hashtable();
private int _generation;
private bool _cleanupRequested;
bool _traceSize;
#if DEBUG
private int[] _ages = new int[10];
private int _hits, _misses;
#endif
private struct AccessorTableKey
{
public AccessorTableKey(SourceValueType sourceValueType, Type type, string name)
{
Invariant.Assert(type != null && type != null);
_sourceValueType = sourceValueType;
_type = type;
_name = name;
}
public override bool Equals(object o)
{
if (o is AccessorTableKey)
return this == (AccessorTableKey)o;
else
return false;
}
public static bool operator==(AccessorTableKey k1, AccessorTableKey k2)
{
return k1._sourceValueType == k2._sourceValueType
&& k1._type == k2._type
&& k1._name == k2._name;
}
public static bool operator!=(AccessorTableKey k1, AccessorTableKey k2)
{
return !(k1 == k2);
}
public override int GetHashCode()
{
return unchecked(_type.GetHashCode() + _name.GetHashCode());
}
SourceValueType _sourceValueType;
Type _type;
string _name;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description: Mapping of (SourceValueType, type, name) to (info, propertyType, args)
//
//---------------------------------------------------------------------------
/***************************************************************************\
Data binding uses reflection to obtain accessors for source properties,
where an "accessor" can be a DependencyProperty, a PropertyInfo, or a
PropertyDescriptor, depending on the nature of the source item and the
property. We cache the result of this discovery process in the
AccessorTable; table lookup is cheaper than doing reflection again.
\***************************************************************************/
using System;
using System.Collections;
using System.ComponentModel; // IBindingList
using System.Reflection; // TypeDescriptor
using System.Windows; // SR
using System.Windows.Threading; // Dispatcher
using MS.Internal; // Invariant.Assert
namespace MS.Internal.Data
{
internal sealed class AccessorInfo
{
internal AccessorInfo(object accessor, Type propertyType, object[] args)
{
_accessor = accessor;
_propertyType = propertyType;
_args = args;
}
internal object Accessor { get { return _accessor; } }
internal Type PropertyType { get { return _propertyType; } }
internal object[] Args { get { return _args; } }
internal int Generation { get { return _generation; } set { _generation = value; } }
object _accessor; // DP, PD, or PI
Type _propertyType; // type of the property
object[] _args; // args for indexed property
int _generation; // used for discarding aged entries
}
internal sealed class AccessorTable
{
internal AccessorTable()
{
}
// map (SourceValueType, type, name) to (accessor, propertyType, args)
internal AccessorInfo this[SourceValueType sourceValueType, Type type, string name]
{
get
{
if (type == null || name == null)
return null;
AccessorInfo info = (AccessorInfo)_table[new AccessorTableKey(sourceValueType, type, name)];
if (info != null)
{
#if DEBUG
// record the age of cache hits
int age = _generation - info.Generation;
if (age >= _ages.Length)
{
int[] newAges = new int[2*age];
_ages.CopyTo(newAges, 0);
_ages = newAges;
}
++ _ages[age];
++ _hits;
#endif
info.Generation = _generation;
}
#if DEBUG
else
{
++ _misses;
}
#endif
return info;
}
set
{
if (type != null && name != null)
{
value.Generation = _generation;
_table[new AccessorTableKey(sourceValueType, type, name)] = value;
if (!_cleanupRequested)
RequestCleanup();
}
}
}
// request a cleanup pass
private void RequestCleanup()
{
_cleanupRequested = true;
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.ContextIdle, new DispatcherOperationCallback(CleanupOperation), null);
}
// run a cleanup pass
private object CleanupOperation(object arg)
{
// find entries that are sufficiently old
object[] keysToRemove = new object[_table.Count];
int n = 0;
IDictionaryEnumerator ide = _table.GetEnumerator();
while (ide.MoveNext())
{
AccessorInfo info = (AccessorInfo)ide.Value;
int age = _generation - info.Generation;
if (age >= AgeLimit)
{
keysToRemove[n++] = ide.Key;
}
}
#if DEBUG
if (_traceSize)
{
Console.WriteLine("After generation {0}, removing {1} of {2} entries from AccessorTable, new count is {3}",
_generation, n, _table.Count, _table.Count - n);
}
#endif
// remove those entries
for (int i=0; i 0)
{
cumulativeHits += _ages[i];
Console.WriteLine("{0,5} {1,6} {2,5} {3,5}",
i, _ages[i], 100*_ages[i]/_hits, 100*cumulativeHits/_hits);
}
}
#endif
}
internal bool TraceSize
{
get { return _traceSize; }
set { _traceSize = value; }
}
private const int AgeLimit = 10; // entries older than this get removed.
private Hashtable _table = new Hashtable();
private int _generation;
private bool _cleanupRequested;
bool _traceSize;
#if DEBUG
private int[] _ages = new int[10];
private int _hits, _misses;
#endif
private struct AccessorTableKey
{
public AccessorTableKey(SourceValueType sourceValueType, Type type, string name)
{
Invariant.Assert(type != null && type != null);
_sourceValueType = sourceValueType;
_type = type;
_name = name;
}
public override bool Equals(object o)
{
if (o is AccessorTableKey)
return this == (AccessorTableKey)o;
else
return false;
}
public static bool operator==(AccessorTableKey k1, AccessorTableKey k2)
{
return k1._sourceValueType == k2._sourceValueType
&& k1._type == k2._type
&& k1._name == k2._name;
}
public static bool operator!=(AccessorTableKey k1, AccessorTableKey k2)
{
return !(k1 == k2);
}
public override int GetHashCode()
{
return unchecked(_type.GetHashCode() + _name.GetHashCode());
}
SourceValueType _sourceValueType;
Type _type;
string _name;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ObjectParameterCollection.cs
- WindowsBrush.cs
- precedingquery.cs
- panel.cs
- RequestCacheValidator.cs
- ResourceSet.cs
- xmlfixedPageInfo.cs
- GlobalItem.cs
- ConsoleCancelEventArgs.cs
- ExpressionWriter.cs
- EventMappingSettingsCollection.cs
- ActivityDesignerHighlighter.cs
- FormView.cs
- InertiaTranslationBehavior.cs
- BamlResourceDeserializer.cs
- CriticalFinalizerObject.cs
- QueueProcessor.cs
- BamlWriter.cs
- TableRow.cs
- StyleBamlRecordReader.cs
- AttachmentCollection.cs
- LogicalChannelCollection.cs
- SHA384Cng.cs
- ColumnHeader.cs
- WindowsAltTab.cs
- ValidationRule.cs
- BamlLocalizableResourceKey.cs
- OneToOneMappingSerializer.cs
- RelationshipEndMember.cs
- SoundPlayerAction.cs
- StagingAreaInputItem.cs
- EntityContainer.cs
- SrgsGrammarCompiler.cs
- CodeMemberField.cs
- AutoGeneratedFieldProperties.cs
- XmlStringTable.cs
- XhtmlStyleClass.cs
- XmlUTF8TextReader.cs
- DataGridViewComboBoxColumnDesigner.cs
- ServiceNameElementCollection.cs
- StreamUpgradeAcceptor.cs
- Adorner.cs
- ProjectedSlot.cs
- WebPartZoneCollection.cs
- Debug.cs
- OleDbEnumerator.cs
- SoapExtensionTypeElementCollection.cs
- BindingManagerDataErrorEventArgs.cs
- dataobject.cs
- UniqueEventHelper.cs
- TextHidden.cs
- XmlConverter.cs
- HttpResponse.cs
- ProviderCollection.cs
- ComNativeDescriptor.cs
- DataGridViewElement.cs
- RewritingProcessor.cs
- AccessedThroughPropertyAttribute.cs
- ProcessHostFactoryHelper.cs
- ServiceProviders.cs
- peernodeimplementation.cs
- KoreanLunisolarCalendar.cs
- PublisherMembershipCondition.cs
- _Semaphore.cs
- TriggerAction.cs
- OverflowException.cs
- DelimitedListTraceListener.cs
- TextPointer.cs
- PostBackOptions.cs
- DataRow.cs
- MetaModel.cs
- ListCollectionView.cs
- AttributeSetAction.cs
- TextRunCacheImp.cs
- Transform.cs
- SamlAssertion.cs
- SystemColorTracker.cs
- AuthStoreRoleProvider.cs
- ScriptControlManager.cs
- ToolStripDropDownClosedEventArgs.cs
- PropertyChangedEventArgs.cs
- DoubleAnimationBase.cs
- SystemIPInterfaceStatistics.cs
- CharConverter.cs
- MediaEntryAttribute.cs
- XmlSecureResolver.cs
- TextTreeObjectNode.cs
- NegotiateStream.cs
- UIElement3D.cs
- CursorInteropHelper.cs
- SecurityAttributeGenerationHelper.cs
- SymbolDocumentGenerator.cs
- ServiceTimeoutsBehavior.cs
- SmiMetaDataProperty.cs
- EntityPropertyMappingAttribute.cs
- CFGGrammar.cs
- UrlPropertyAttribute.cs
- MenuRendererStandards.cs
- ViewBase.cs
- SystemIcons.cs