RemotingCachedData.cs

namespace System.Runtime.Remoting.Metadata
{
    internal abstract class RemotingCachedData
    {
        private SoapAttribute _soapAttr;

        internal SoapAttribute GetSoapAttribute()
        {
            if (_soapAttr == null)
            {
                lock (this)
                {
                    if (_soapAttr == null)
                    {
                        _soapAttr = GetSoapAttributeNoLock();
                    }
                }
            }
            return _soapAttr;
        }

        internal abstract SoapAttribute GetSoapAttributeNoLock();
    }
}