/// <summary>
/// Processes a single task and updates the queue accordingly.
/// </summary>
/// <param name="task"></param>
protected internal void ProcessTask(TaskMessage task)
{
// Get the state of the task into the performer.
Performer.TaskStorage = task.Storage;
// Let the performer have a go with the task.
try { Performer.Perform(task.Parameters); }
catch (Exception exception)
{
// The performer has raised an exception while processing
// the task. We do what we can to preserve the task,
// and set it back as failed.
try { task.Storage = Performer.TaskStorage; }
catch {}
var message =
"The performer raised an exception: "
+ exception.Message
+ "\n"
+ exception.StackTrace;
MonitorClient.Fail(message);
Log.Error(message);
return;
}
// Collect the task's state and save it back to the task.
task.Storage = Performer.TaskStorage;
// Collect the result of the perfomer's work and act on it.
var result = Performer.Status;
switch (result.Outcome)
{
case Outcome.Success:
MonitorClient.Succeed();
Log.Info("Task succeeded.");
break;
case Outcome.Failure:
MonitorClient.Fail(result.Reason);
Log.InfoFormat("Task failed. Reason: {0}", result.Reason);
if (result.Data is Exception)
{
Log.Error("Exception associated with task failure:", result.Data as Exception);
}
if (result.Data is string)
{
Log.InfoFormat("Additional Information: {0}", result.Data);
}
break;
case Outcome.CriticalFailure:
MonitorClient.CriticalFail(result.Reason);
Log.InfoFormat("Task failed critically. Reason: {0}", result.Reason);
if (result.Data is string)
{
Log.InfoFormat("Additional Information: {0}", result.Data);
}
break;
case Outcome.Defer:
MonitorClient.Defer(result.Reason);
Log.InfoFormat("Task deferred. Reason: {0}", result.Reason);
if (result.Data is string)
{
Log.InfoFormat("Additional Information: {0}", result.Data);
}
break;
}
}