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ConcurrentWeakSet.cs
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72 lines (62 loc) · 1.82 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Generic;
namespace Microsoft.ClearScript.Util
{
internal sealed 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;
}
}
}