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//---------------------------------------------------------------------
// <copyright file="ThreadSafeList.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
using System.Collections.Generic;
using System.Threading;
namespace System.Data.Common.Utils
{
internal sealed class ThreadSafeList<T> : IList<T>
{
private readonly ReaderWriterLockSlim _lock;
private List<T> _list;
internal ThreadSafeList()
{
_list = new List<T>();
_lock = new ReaderWriterLockSlim();
}
public int Count
{
get
{
_lock.EnterReadLock();
int count;
try
{
count = _list.Count;
}
finally
{
_lock.ExitReadLock();
}
return count;
}
}
public void Add(T item)
{
_lock.EnterWriteLock();
try
{
_list.Add(item);
}
finally
{
_lock.ExitWriteLock();
}
}
public T this[int index]
{
get
{
_lock.EnterReadLock();
T result;
try
{
result = _list[index];
}
finally
{
_lock.ExitReadLock();
}
return result;
}
set
{
_lock.EnterWriteLock();
try
{
_list[index] = value;
}
finally
{
_lock.ExitWriteLock();
}
}
}
public bool IsReadOnly
{
get
{
return false;
}
}
public int IndexOf(T item)
{
_lock.EnterReadLock();
int result;
try
{
result = _list.IndexOf(item);
}
finally
{
_lock.ExitReadLock();
}
return result;
}
public void Insert(int index, T item)
{
_lock.EnterWriteLock();
try
{
_list.Insert(index, item);
}
finally
{
_lock.ExitWriteLock();
}
}
public void RemoveAt(int index)
{
_lock.EnterWriteLock();
try
{
_list.RemoveAt(index);
}
finally
{
_lock.ExitWriteLock();
}
}
public void Clear()
{
_lock.EnterWriteLock();
try
{
_list.Clear();
}
finally
{
_lock.ExitWriteLock();
}
}
public bool Contains(T item)
{
_lock.EnterReadLock();
bool result;
try
{
result = _list.Contains(item);
}
finally
{
_lock.ExitReadLock();
}
return result;
}
public void CopyTo(T[] array, int arrayIndex)
{
_lock.EnterWriteLock();
try
{
_list.CopyTo(array, arrayIndex);
}
finally
{
_lock.ExitWriteLock();
}
}
public bool Remove(T item)
{
_lock.EnterWriteLock();
bool result;
try
{
result = _list.Remove(item);
}
finally
{
_lock.ExitWriteLock();
}
return result;
}
public IEnumerator<T> GetEnumerator()
{
_lock.EnterReadLock();
try
{
foreach (T value in _list)
{
yield return value;
}
}
finally
{
_lock.ExitReadLock();
}
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this.GetEnumerator();
}
}
}
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