public void Execute(BackgroundProcessContext context)
{
_logger.Trace($"{BackgroundServerProcess.GetServerTemplate(context.ServerId)} waiting for {_interval} delay before sending a heartbeat");
context.ShutdownToken.Wait(_interval);
context.ShutdownToken.ThrowIfCancellationRequested();
try
{
using (var connection = context.Storage.GetConnection())
{
connection.Heartbeat(context.ServerId);
}
if (_faultedSince == null)
{
_logger.Debug($"{BackgroundServerProcess.GetServerTemplate(context.ServerId)} heartbeat successfully sent");
}
else
{
_logger.Info($"{BackgroundServerProcess.GetServerTemplate(context.ServerId)} is now able to continue sending heartbeats");
_faultedSince = null;
}
}
catch (BackgroundServerGoneException)
{
if (!context.ShutdownToken.IsCancellationRequested)
{
_logger.Warn($"{BackgroundServerProcess.GetServerTemplate(context.ServerId)} was considered dead by other servers, restarting...");
_requestRestart();
}
return;
}
catch (Exception ex)
{
_logger.WarnException($"{BackgroundServerProcess.GetServerTemplate(context.ServerId)} encountered an exception while sending heartbeat", ex);
if (_faultedSince == null)
{
_faultedSince = Stopwatch.StartNew();
}
if (_faultedSince.Elapsed >= _serverTimeout)
{
_logger.Error($"{BackgroundServerProcess.GetServerTemplate(context.ServerId)} will be restarted due to server time out");
_requestRestart();
return;
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="BackgroundProcessingServer"/>
/// class and immediately starts all the given background processes.
/// </summary>
internal BackgroundProcessingServer(
[NotNull] BackgroundServerProcess process,
[NotNull] BackgroundProcessingServerOptions options)
{
_process = process ?? throw new ArgumentNullException(nameof(process));
_options = options ?? throw new ArgumentNullException(nameof(options));
_dispatcher = CreateDispatcher();
#if !NETSTANDARD1_3
AppDomain.CurrentDomain.DomainUnload += OnCurrentDomainUnload;
AppDomain.CurrentDomain.ProcessExit += OnCurrentDomainUnload;
#endif
}
/// <summary>
/// Initializes a new instance of the <see cref="BackgroundProcessingServer"/>
/// class and immediately starts all the given background processes.
/// </summary>
internal BackgroundProcessingServer(
[NotNull] BackgroundServerProcess process,
[NotNull] BackgroundProcessingServerOptions options)
{
_process = process ?? throw new ArgumentNullException(nameof(process));
_options = options ?? throw new ArgumentNullException(nameof(options));
_dispatcher = CreateDispatcher();
#if !NETSTANDARD1_3
AppDomain.CurrentDomain.DomainUnload += OnCurrentDomainUnload;
AppDomain.CurrentDomain.ProcessExit += OnCurrentDomainUnload;
#endif
_shutdownRegistration = AspNetShutdownDetector.GetShutdownToken().Register(Dispose);
}
