Serilog Application Shutdown

loggingshutdowndetector.cs

using Serilog;
using Serilog.Core;
using System;
using System.Web.Hosting;

namespace Merchant.Api.Logging
{
    /// <summary>
    /// Detects application pool shutdowns and ensures all batched log entries
    /// are flushed.
    /// </summary>
    public class LoggerShutdownDetector : IRegisteredObject
    {
        private readonly ILogger _logger;

        public LoggerShutdownDetector(ILogger logger)
        {
            if (logger == null) throw new ArgumentNullException(nameof(logger));
            _logger = logger;
        }

        /// <summary>
        /// Registers the shutdown detector with the hosting environment.
        /// </summary>
        public void Initialize()
        {
            HostingEnvironment.RegisterObject(this);
        }

        /// <summary>
        /// Called when a shutdown is detected.
        /// https://msdn.microsoft.com/en-us/library/system.web.hosting.iregisteredobject.stop(v=vs.110).aspx
        /// </summary>
        /// <param name="immediate">true to indicate the registered object should unregister from the hosting environment before returning; otherwise, false.</param>
        public void Stop(bool immediate)
        {
            try
            {
                _logger.Information("Application Stopping");
                
                // Ensure any batched sinks are flushed
                // https://github.com/serilog/serilog/wiki/Lifecycle-of-Loggers
                (_logger as Logger)?.Dispose();
            }
            catch
            {
                // Swallow the exception as Stop should never throw
            }
            finally
            {
                HostingEnvironment.UnregisterObject(this);
            }
        }
    }
}