Opc.Ua.Client.Session.OnKeepAliveError C# (CSharp) Method

        protected virtual bool OnKeepAliveError(ServiceResult result)
        {
            long delta = 0;

            lock (m_eventLock)
            {   
                delta = DateTime.UtcNow.Ticks - m_lastKeepAliveTime.Ticks;       
            }

            Utils.Trace(
                "KEEP ALIVE LATE: {0}s, EndpointUrl={1}, RequestCount={3}/{2}", 
                ((double)delta)/TimeSpan.TicksPerSecond,
                this.Endpoint.EndpointUrl,
                this.OutstandingRequestCount,
                this.GoodPublishRequestCount);  
                        
            KeepAliveEventHandler callback = null;
            
            lock (m_eventLock)
            {
                callback = m_KeepAlive;
            }

            if (callback != null)
            {
                try
                {
                    KeepAliveEventArgs args = new KeepAliveEventArgs(result, ServerState.Unknown, DateTime.UtcNow);
                    callback(this, args);
                    return !args.CancelKeepAlive;
                }
                catch (Exception e)
                {
                    Utils.Trace(e, "Session: Unexpected error invoking KeepAliveCallback.");
                }
            }

            return true;
        }
        #endregion