private async Task <DecisionTask> PollAmazonSwfForDecisionTaskAsync(TaskList taskList, string pollingIdentity, CancellationToken token, string nextPageToken)
{
var request = taskList.DecisionTaskPollingRequest(_name, pollingIdentity, nextPageToken);
var response = await _simpleWorkflowClient.PollForDecisionTaskAsync(request, token);
return(response?.DecisionTask);
}
/// <summary>
/// Retrieves the next page of history from
/// </summary>
/// <returns>The next page of history events.</returns>
private List <HistoryEvent> GetNextPage()
{
var request = new PollForDecisionTaskRequest {
Domain = _request.Domain,
NextPageToken = _lastResponse.NextPageToken,
TaskList = _request.TaskList,
MaximumPageSize = _request.MaximumPageSize
};
const int retryCount = 10;
int currentTry = 1;
bool pollFailed;
do
{
pollFailed = false;
try
{
_lastResponse = _swfClient.PollForDecisionTaskAsync(request).Result.DecisionTask;
}
catch (Exception ex)
{
Console.Error.WriteLine("Poll request failed with exception: " + ex);
pollFailed = true;
}
currentTry += 1;
} while (pollFailed && currentTry <= retryCount);
return(_lastResponse.Events);
}
private async Task <PollForDecisionTaskResponse> PollForDecisionTaskAsync(string domain, string taskList, string workerId, string nextPageToken = null)
{
return(await _workflow.PollForDecisionTaskAsync(new PollForDecisionTaskRequest
{
Domain = domain,
Identity = workerId,
TaskList = new TaskList
{
Name = taskList
},
NextPageToken = nextPageToken
}));
}
DecisionTask Poll()
{
Logger.LogMessage("Polling for Decision task ...");
PollForDecisionTaskRequest request = new PollForDecisionTaskRequest()
{
Domain = Constants.SWF_DOMAIN,
TaskList = new TaskList()
{
Name = Constants.SWF_DECIDER_TASKLIST
}
};
PollForDecisionTaskResponse response = _swfClient.PollForDecisionTaskAsync(request).Result;
return(response.DecisionTask);
}
async IAsyncEnumerable <PollForDecisionTaskResponse> IPaginator <PollForDecisionTaskResponse> .PaginateAsync(CancellationToken cancellationToken = default)
{
if (Interlocked.Exchange(ref _isPaginatorInUse, 1) != 0)
{
throw new System.InvalidOperationException("Paginator has already been consumed and cannot be reused. Please create a new instance.");
}
var nextPageToken = _request.NextPageToken;
PollForDecisionTaskResponse response;
do
{
_request.NextPageToken = nextPageToken;
response = await _client.PollForDecisionTaskAsync(_request, cancellationToken).ConfigureAwait(false);
nextPageToken = response.DecisionTask.NextPageToken;
cancellationToken.ThrowIfCancellationRequested();
yield return(response);
}while (nextPageToken != null);
}
/// <summary>
/// Polls for descision tasks and decides what decisions to make.
/// </summary>
internal void PollAndDecide()
{
Debug.Assert(_workflow != null);
while (!_cancellationToken.IsCancellationRequested)
{
var taskTolken = "";
try
{
var decisionTaskRequest = new PollForDecisionTaskRequest
{
Domain = _workflow.Options.Domain,
//Identity = _workflow.WorkflowId,
TaskList = _workflow.TaskList // This could be a specific TaskList instead of default value from context.
};
Logger.Debug("TaskList: {0}", _workflow.TaskList.Name);
PollForDecisionTaskResponse decisionTaskResponse = _swfClient.PollForDecisionTaskAsync(decisionTaskRequest).Result;
DecisionTask decisionTask = decisionTaskResponse.DecisionTask;
taskTolken = decisionTask.TaskToken;
if (!string.IsNullOrEmpty(decisionTask.TaskToken))
{
Logger.Debug("Get Decision.");
// Define a new WorkflowEventsProcessor object and let it make the decision!
var workflowProcessor = new WorkflowEventsProcessor(decisionTask, _workflow, decisionTaskRequest, _swfClient, _storageClient);
var decisionRequest = workflowProcessor.Decide();
//var decisionRequest = _workflow.Decide(decisionTask, decisionTaskRequest);
Logger.Debug("RespondDecisionTaskCompleted.");
// We have our decision, send it away and do something more productive with the response
_swfClient.RespondDecisionTaskCompletedAsync(decisionRequest).Wait();
}
//Sleep to avoid aggressive polling
Thread.Sleep(200);
}
/*catch (AmazonSimpleWorkflowException ex)
* {
* Logger.Error(ex, "");
*
* //if (_workflow != null)
* // _workflow.StopWorkers();
*
* //if (!string.IsNullOrEmpty(taskTolken))
* //{
* // var respond = _workflow.FailWorkflowRespond(ex.Message, "");
* // respond.TaskToken = taskTolken;
* // try
* // {
* // // Just try to stop workflow.
* // _swfClient.RespondDecisionTaskCompleted(respond);
* // }
* // catch
* // {
* // }
* //}
* //Console.WriteLine("Caught Exception: " + ex.Message);
* //Console.WriteLine("Response Status Code: " + ex.StatusCode);
* //Console.WriteLine("Error Code: " + ex.ErrorCode);
* //Console.WriteLine("Error Type: " + ex.ErrorType);
* //Console.WriteLine("Request ID: " + ex.RequestId);
* //Console.WriteLine("Data: " + ex.Data);
* //Console.WriteLine("Stacktrace: " + ex.StackTrace);
* }*/
catch (Exception e)
{
Logger.Error(e, "");
//if (_workflow != null)
// _workflow.StopWorkers();
//if (!string.IsNullOrEmpty(taskTolken))
//{
// var respond = _workflow.FailWorkflowRespond(e.Message, "");
// respond.TaskToken = taskTolken;
// try
// {
// // Just try to stop workflow.
// _swfClient.RespondDecisionTaskCompleted(respond);
// }
// catch
// {
// }
//}
}
}
Logger.Info("Exit from Workflow Worker.");
}
