private void ProcessJob(
string jobId,
IStorageConnection connection,
IJobPerformanceProcess process,
CancellationToken shutdownToken)
{
var stateMachine = _context.StateMachineFactory.Create(connection);
var processingState = new ProcessingState(_context.ServerId, _context.WorkerNumber);
if (!stateMachine.TryToChangeState(
jobId,
processingState,
new[] { EnqueuedState.StateName, ProcessingState.StateName }))
{
return;
}
// Checkpoint #3. Job is in the Processing state. However, there are
// no guarantees that it was performed. We need to re-queue it even
// it was performed to guarantee that it was performed AT LEAST once.
// It will be re-queued after the JobTimeout was expired.
IState state;
try
{
var jobData = connection.GetJobData(jobId);
jobData.EnsureLoaded();
var cancellationToken = new ServerJobCancellationToken(
jobId, connection, _context, shutdownToken);
var performContext = new PerformContext(
_context, connection, jobId, jobData.Job, jobData.CreatedAt, cancellationToken);
var latency = (DateTime.UtcNow - jobData.CreatedAt).TotalMilliseconds;
var duration = Stopwatch.StartNew();
process.Run(performContext, jobData.Job);
duration.Stop();
state = new SucceededState((long)latency, duration.ElapsedMilliseconds);
}
catch (OperationCanceledException)
{
throw;
}
catch (JobPerformanceException ex)
{
state = new FailedState(ex.InnerException)
{
Reason = ex.Message
};
}
catch (Exception ex)
{
state = new FailedState(ex)
{
Reason = "Internal HangFire Server exception occurred. Please, report it to HangFire developers."
};
}
// Ignore return value, because we should not do
// anything when current state is not Processing.
stateMachine.TryToChangeState(jobId, state, new[] { ProcessingState.StateName });
}
internal PerformContext(PerformContext context)
: this(context, context.Connection, context.JobId, context.Job, context.CreatedAt, context.CancellationToken)
{
Items = context.Items;
}