/// <summary>
/// Processes the error by logging it and then running the hosted Error method and waiting for the result.
/// </summary>
/// <param name="hostedProcess">The hosted service.</param>
/// <param name="e">The exception to handle.</param>
/// <param name="forceStop">if set to <c>true</c> [force stop].</param>
internal void ProcessError(IHostedProcess hostedProcess, Exception e, bool forceStop = true)
{
Status = HostStatus.Faulted;
// Lock statement as this method can be accessed from both threads.
lock (_lockGate)
{
_logger?.LogError($"Application host has caught an error {hostedProcess?.GetType().Name}: {e?.Message}");
var args = new ErrorArgs {
ContinueClose = forceStop
};
try
{
hostedProcess?.Error(e, args);
_logger?.LogDebug($"Ran {hostedProcess?.GetType().Name}'s Error method successfully");
}
catch (Exception ex)
{
_logger?.LogError(ex, $"Error caught in process error handling for {hostedProcess?.GetType().Name}: {ex.Message}");
}
// Don't stop the app if the hosted process decides it does not want that and changes the Continue close arg.
if (args.ContinueClose)
{
// As an error occurred, stop processing now and shut down.
ProcessingStop();
}
}
}
/// <summary>
/// Adds the hosted process into the service collection.
/// </summary>
/// <param name="process">The service to add.</param>
/// <returns>AppHostBuilder with the new process added.</returns>
public AppHostBuilder AddHostedProcess(IHostedProcess process)
{
var type = process.GetType();
_services.AddSingleton(type, process);
_processTypes.Add(type);
return(this);
}
private Task StartHostedProcess(bool runOnce, [NotNull] IHostedProcess process, string name)
{
// Run the hosted process, wrapped in polly retry logic.
return(BuildWrappedPolicy().ExecuteAsync(token => process.Start(_context, token), _cancellation.Token)
.ContinueWith(p =>
{
if (p.IsFaulted)
{
_logger?.LogError(p.Exception, $"Error running hosted process {name} execution {p.Exception?.Message}");
ProcessError(process, p.Exception, !runOnce);
}
if (p.Status == TaskStatus.Canceled)
{
_logger?.LogWarning("Hosted process cancelled");
}
}));
}
/// <summary>
/// Initializes a new instance of the <see cref="ProcessEventArgs"/> class.
/// </summary>
/// <param name="process">The process.</param>
public ProcessEventArgs(IHostedProcess process)
{
this._Process = process;
}
public void HandleHostedProcessFailure(IHostedProcess sender, string reason)
{
HandleProcessFailure(reason);
}
/// <summary>
/// Initializes a new instance of the <see cref="ProcessTerminatedEventArgs"/> class.
/// </summary>
/// <param name="process">The process.</param>
public ProcessTerminatedEventArgs(IHostedProcess process)
: base(process)
{
}
public void HandleHostedProcessFailure(IHostedProcess sender, string reason)
{
HandleProcessFailure(reason);
}
/// <summary>
/// Initializes a new instance of the <see cref="ProcessStartedEventArgs"/> class.
/// </summary>
/// <param name="process">The process.</param>
public ProcessStartedEventArgs(IHostedProcess process)
: base(process)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ProcessEventArgs"/> class.
/// </summary>
/// <param name="process">The process.</param>
public ProcessEventArgs(IHostedProcess process)
{
this._Process = process;
}
/// <summary>
/// Terminates the process.
/// </summary>
/// <param name="process">The process.</param>
private void TerminateProcess(IHostedProcess process)
{
if (!process.HasExited)
{
this.OnProcessTerminating.RaiseEvent(this, new ProcessTerminatingEventArgs(process));
process.Kill();
this.OnProcessTerminated.RaiseEvent(this, new ProcessTerminatedEventArgs(process));
}
}
/// <summary>
/// Checks the remove completed process.
/// </summary>
/// <param name="generationDao">The generation DAO.</param>
/// <param name="process">The process.</param>
private void CheckRemoveCompletedProcess(GenerationDao generationDao, IHostedProcess process)
{
ReportGenerationQueue processingReport = generationDao.Find<ReportGenerationQueue>(queue =>
queue.ReportGenerationQueueId == process.ReportGenerationQueueId);
if (processingReport != null)
{
// If the process is completed, cancelled or failed, remove it from the queue
if (processingReport.ReportGenerationStatus.In(ReportStatus.Completed, ReportStatus.Cancelled, ReportStatus.Failed))
{
if (processingReport.ReportGenerationStatus == ReportStatus.Cancelled)
{
this.TerminateProcess(process);
}
this._reportGeneratorEngineList.Remove(process);
}
else
{
if (process.HasExited)
{
this._reportGeneratorEngineList.Remove(process);
}
}
}
}
/// <summary>
/// Adds the IHostedProcess to the service collection.
/// </summary>
/// <param name="serviceBuilder">A collection of services</param>
/// <param name="process">The IHostedProcess to add to the service collection.</param>
/// <returns>List of services with the IHostedProcess attached.</returns>
public static IServiceCollection AddHostedProcess(this IServiceCollection serviceBuilder, IHostedProcess process)
{
var type = process.GetType();
ProcessTypes.Add(type);
serviceBuilder.AddSingleton(type, process);
return(serviceBuilder);
}
