Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / 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.
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