using System;
using System.Threading;
using JD.Kernel.Classes;

namespace JD.Threading
{
    public class SafeAccessor<T> where T : class
    {
        protected readonly T m_unsafeObject;

        public SafeAccessor(T unsafeObject)
        {
            m_unsafeObject = unsafeObject;
        }

        public IDisposable Use(out T unsafeObject)
        {
            Monitor.Enter(m_unsafeObject);

            unsafeObject = m_unsafeObject;

            try
            {
                return new DisposableHelper(() => Monitor.Exit(m_unsafeObject));
            }
            catch
            {
                Monitor.Exit(m_unsafeObject);
                throw;
            }
        }
    }
}