private async Task PollCommands()
{
var activity = WorkflowActivity.StartPoll("commands");
try
{
if (!_persistenceStore.SupportsScheduledCommands)
{
return;
}
if (await _lockProvider.AcquireLock("poll-commands", new CancellationToken()))
{
try
{
_logger.LogDebug("Polling for scheduled commands");
await _persistenceStore.ProcessCommands(new DateTimeOffset(_dateTimeProvider.UtcNow), async (command) =>
{
switch (command.CommandName)
{
case ScheduledCommand.ProcessWorkflow:
await _queueProvider.QueueWork(command.Data, QueueType.Workflow);
break;
case ScheduledCommand.ProcessEvent:
await _queueProvider.QueueWork(command.Data, QueueType.Event);
break;
}
});
}
finally
{
await _lockProvider.ReleaseLock("poll-commands");
}
}
}
catch (Exception ex)
{
_logger.LogError(ex, ex.Message);
activity?.RecordException(ex);
}
finally
{
activity?.Dispose();
}
}
private async Task PollWorkflows()
{
var activity = WorkflowActivity.StartPoll("workflows");
try
{
if (await _lockProvider.AcquireLock("poll runnables", new CancellationToken()))
{
try
{
_logger.LogDebug("Polling for runnable workflows");
var runnables = await _persistenceStore.GetRunnableInstances(_dateTimeProvider.Now);
foreach (var item in runnables)
{
if (_persistenceStore.SupportsScheduledCommands)
{
try
{
await _persistenceStore.ScheduleCommand(new ScheduledCommand()
{
CommandName = ScheduledCommand.ProcessWorkflow,
Data = item,
ExecuteTime = _dateTimeProvider.UtcNow.Ticks
});
continue;
}
catch (Exception ex)
{
_logger.LogError(ex, ex.Message);
activity?.RecordException(ex);
}
}
if (_greylist.Contains($"wf:{item}"))
{
_logger.LogDebug($"Got greylisted workflow {item}");
continue;
}
_logger.LogDebug("Got runnable instance {0}", item);
_greylist.Add($"wf:{item}");
await _queueProvider.QueueWork(item, QueueType.Workflow);
}
}
finally
{
await _lockProvider.ReleaseLock("poll runnables");
}
}
}
catch (Exception ex)
{
_logger.LogError(ex, ex.Message);
activity?.RecordException(ex);
}
finally
{
activity?.Dispose();
}
}