ClearScript/ClearScript/Util/ConcurrentWeakSet.cs at master · orudge/ClearScript · GitHub

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// Licensed under the MIT license.

using System;

using System.Collections.Generic;

namespace Microsoft.ClearScript.Util

{

internal class ConcurrentWeakSet<T> where T : class

{

private readonly object dataLock = new object();

private List<WeakReference> weakRefs = new List<WeakReference>();

public int Count

{

get { return GetItems().Count; }

}

public bool Contains(T item)

{

MiscHelpers.VerifyNonNullArgument(item, "item");

return GetItems().Contains(item);

}

public bool TryAdd(T item)

{

MiscHelpers.VerifyNonNullArgument(item, "item");

lock (dataLock)

{

if (!GetItemsInternal().Contains(item))

{

weakRefs.Add(new WeakReference(item));

return true;

}

return false;

}

public void ForEach(Action<T> action)

{

MiscHelpers.VerifyNonNullArgument(action, "action");

GetItems().ForEach(action);

}

private List<T> GetItems()

{

lock (dataLock)

{

return GetItemsInternal();

}

private List<T> GetItemsInternal()

{

var items = new List<T>();

var tempWeakRefs = new List<WeakReference>();

foreach (var weakRef in weakRefs)

{

var item = weakRef.Target as T;

if (item != null)

{

items.Add(item);

tempWeakRefs.Add(weakRef);

}

weakRefs = tempWeakRefs;

return items;

}

ClearScript/ClearScript/Util/ConcurrentWeakSet.cs at master · orudge/ClearScript · GitHub

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