Implementing concurrent HashSet
Introduction:
The .NET Framework does not provide a built-in implementation of a concurrent HashSet
Custom thread safety implementation:
One approach is to create a custom thread-safe HashSet
public class ConcurrentHashSet<T>
{
private readonly HashSet<T> _hashSet = new HashSet<T>();
private readonly object _syncRoot = new object();
public bool Add(T item)
{
lock (_syncRoot)
{
return _hashSet.Add(item);
}
}
public bool Remove(T item)
{
lock (_syncRoot)
{
return _hashSet.Remove(item);
}
}
// 其他操作可以類似地實現(xiàn)
}
Use ConcurrentDictionary
Another approach is to utilize the ConcurrentDictionary
private ConcurrentDictionary<T, byte> _concurrentDictionary = new ConcurrentDictionary<T, byte>();
public bool Add(T item)
{
byte dummyValue = 0;
return _concurrentDictionary.TryAdd(item, dummyValue);
}
public bool Remove(T item)
{
byte dummyValue;
return _concurrentDictionary.TryRemove(item, out dummyValue);
}
// 其他操作可以類似地實現(xiàn)
Note:
When choosing a method, consider the following factors:
- Concurrency Safety: Both methods provide thread-safe access to the underlying data structures.
-
Performance: In some cases, a custom implementation may have better performance than ConcurrentDictionary
-
Simplicity: ConcurrentDictionary
-
HashSet
: ConcurrentDictionary, so some HashSet -specific functionality may be lost.
Conclusion:
The need for concurrent HashSets
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