using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections; namespace Signum.Utilities.Synchronization { public class TreadSafeEnumerator<T>: IEnumerable<T>, IEnumerator<T> { object key = new object(); IEnumerator<T> enumerator; volatile bool moveNext = true; //lo que necesitaria es una variable de instancia ThreadStatic //podriamos imitarla con un diccionario por hilo de instancia //pero requeriria locks asi que en lugar de Instancia->Hilo->Valor hacemos Hilo->Instancia->Valor y asi aprovechamos el thread static [ThreadStatic] static Dictionary<TreadSafeEnumerator<T>, T> dictionary; T current { get { return dictionary[this]; } set { if (dictionary == null) dictionary = new Dictionary<TreadSafeEnumerator<T>, T>(); dictionary[this] = value; } } public TreadSafeEnumerator(IEnumerable<T> source) { enumerator = source.GetEnumerator(); } public IEnumerator<T> GetEnumerator() { return this; } IEnumerator IEnumerable.GetEnumerator() { return this; } public T Current { get {return current; } } object IEnumerator.Current { get { return current; } } public bool MoveNext() { lock (key) { if (moveNext && (moveNext = enumerator.MoveNext())) current = enumerator.Current; else current = default(T); return moveNext; } } public void Reset() { throw new NotImplementedException(); } public void Dispose() { if (dictionary != null) { dictionary.Remove(this); if (dictionary.Count == 0) dictionary = null; } } } }
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