|
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using Pfz.Extensions.MonitorLockExtensions;
using Pfz.Threading;
namespace Pfz.Caching
{
/// <summary>
/// This is an array of objects, where each object can be collected.
/// Each time an item is accessed by the indexer, a GCUtils.KeepAlive
/// is done.
/// </summary>
/// <typeparam name="T">The type of the array.</typeparam>
public sealed class WeakArray<T>:
ThreadSafeDisposable,
IEnumerable<T>
where
T: class
{
#region Empty weak array
/// <summary>
/// Gets an empty WeakArray.
/// </summary>
[SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes")]
public static readonly WeakArray<T> Empty = new WeakArray<T>(0);
#endregion
#region Private array
private UnsafeWeakArray<T> _array;
#endregion
#region Constructor
/// <summary>
/// Creates the array with the given length.
/// </summary>
public WeakArray(int length)
{
try
{
}
finally
{
_array = new UnsafeWeakArray<T>(length);
}
}
#endregion
#region Dispose
/// <summary>
/// Releases the handles used by the array.
/// </summary>
protected override void Dispose(bool disposing)
{
var array = _array;
if (array != default(UnsafeWeakArray<T>))
{
_array = default(UnsafeWeakArray<T>);
array.Free();
}
base.Dispose(disposing);
}
#endregion
#region Properties
#region Length
/// <summary>
/// Gets the number of items in this array.
/// </summary>
public int Length
{
get
{
lock(DisposeLock)
{
CheckUndisposed();
return _array.Length;
}
}
}
#endregion
#region this[]
/// <summary>
/// Gets or sets the items in this array.
/// </summary>
/// <param name="index">The index of the item to get or set.</param>
public T this[int index]
{
get
{
T result = default(T);
lock(DisposeLock)
{
CheckUndisposed();
result = _array[index];
}
return result;
}
set
{
lock(DisposeLock)
{
CheckUndisposed();
_array[index] = value;
}
}
}
#endregion
#endregion
#region Methods
#region ToArray
/// <summary>
/// Converts this WeakArray into a common array.
/// </summary>
public T[] ToArray()
{
T[] result = null;
lock(DisposeLock)
{
CheckUndisposed();
int count = _array.Length;
result = new T[count];
for(int i=0; i<count; i++)
result[i] = _array.GetAllowingExpiration(i);
}
return result;
}
#endregion
#region ToList
/// <summary>
/// Converts this WeakArray into a list.
/// </summary>
public List<T> ToList()
{
List<T> result = null;
lock(DisposeLock)
{
CheckUndisposed();
int count = _array.Length;
result = new List<T>(count);
for(int i=0; i<count; i++)
result.Add(_array.GetAllowingExpiration(i));
}
return result;
}
#endregion
#region GetEnumerator
/// <summary>
/// Gets an enumerator for this array, so foreach can be done.
/// </summary>
public IEnumerator<T> GetEnumerator()
{
return ToList().GetEnumerator();
}
#endregion
#endregion
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator()
{
return ToArray().GetEnumerator();
}
#endregion
}
}
|
By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.
If a file you wish to view isn't highlighted, and is a text file (not binary), please
let us know and we'll add colourisation support for it.
I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).