public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
{
PollForDecisionTaskResponse response = new PollForDecisionTaskResponse();
UnmarshallResult(context, response);
return(response);
}
/// <summary>
/// Unmarshaller the response from the service to the response class.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
{
PollForDecisionTaskResponse response = new PollForDecisionTaskResponse();
response.DecisionTask = DecisionTaskUnmarshaller.Instance.Unmarshall(context);
return(response);
}
public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
{
PollForDecisionTaskResponse response = new PollForDecisionTaskResponse();
context.Read();
response.PollForDecisionTaskResult = PollForDecisionTaskResultUnmarshaller.GetInstance().Unmarshall(context);
return(response);
}
private async Task <DecisionTask> GetDecisionTask(string domain, string taskList, string workerId)
{
PollForDecisionTaskResponse response = null;
do
{
response = await PollForDecisionTaskAsync(domain, taskList, workerId);
}while (_isRunning && string.IsNullOrEmpty(response.DecisionTask.TaskToken));
await AccumulateAdditionalPages(domain, taskList, workerId, response.DecisionTask);
return(response.DecisionTask);
}
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);
}
private async Task <DecisionTask> Poll()
{
this.EmrJobLogger.PrintInfo(SwfResources.Info_PollingDecisionTask);
PollForDecisionTaskRequest request = new PollForDecisionTaskRequest()
{
Domain = this.SwfConfiguration.DomainName,
TaskList = new TaskList()
{
Name = this.SwfConfiguration.DecisionTasksList
}
};
PollForDecisionTaskResponse response = await this.SwfClient.PollForDecisionTaskAsync(request);
return(response.DecisionTask);
}
private static void UnmarshallResult(JsonUnmarshallerContext context, PollForDecisionTaskResponse response)
{
response.DecisionTask = DecisionTaskUnmarshaller.GetInstance().Unmarshall(context);
return;
}
// Simple logic
// Creates four activities at the begining
// Waits for them to complete and completes the workflow
static void Decider()
{
int activityCount = 0; // This refers to total number of activities per workflow
IAmazonSimpleWorkflow swfClient = AWSClientFactory.CreateAmazonSimpleWorkflowClient();
while (true)
{
Console.WriteLine("Decider: Polling for decision task ...");
PollForDecisionTaskRequest request = new PollForDecisionTaskRequest()
{
Domain = domainName,
TaskList = new TaskList()
{
Name = "HelloWorld"
}
};
PollForDecisionTaskResponse response = swfClient.PollForDecisionTask(request);
if (response.DecisionTask.TaskToken == null)
{
Console.WriteLine("Decider: NULL");
continue;
}
int completedActivityTaskCount = 0, totalActivityTaskCount = 0;
foreach (HistoryEvent e in response.DecisionTask.Events)
{
Console.WriteLine("Decider: EventType - " + e.EventType +
", EventId - " + e.EventId);
if (e.EventType == "ActivityTaskCompleted")
{
completedActivityTaskCount++;
}
if (e.EventType.Value.StartsWith("Activity"))
{
totalActivityTaskCount++;
}
}
Console.WriteLine(".... completedCount=" + completedActivityTaskCount);
List <Decision> decisions = new List <Decision>();
if (totalActivityTaskCount == 0) // Create this only at the begining
{
ScheduleActivity("Activity1A", decisions);
ScheduleActivity("Activity1B", decisions);
ScheduleActivity("Activity2", decisions);
ScheduleActivity("Activity2", decisions);
activityCount = 4;
}
else if (completedActivityTaskCount == activityCount)
{
Decision decision = new Decision()
{
DecisionType = DecisionType.CompleteWorkflowExecution,
CompleteWorkflowExecutionDecisionAttributes =
new CompleteWorkflowExecutionDecisionAttributes {
Result = "{\"Result\":\"WF Complete!\"}"
}
};
decisions.Add(decision);
Console.WriteLine("Decider: WORKFLOW COMPLETE!!!!!!!!!!!!!!!!!!!!!!");
}
RespondDecisionTaskCompletedRequest respondDecisionTaskCompletedRequest =
new RespondDecisionTaskCompletedRequest()
{
Decisions = decisions,
TaskToken = response.DecisionTask.TaskToken
};
swfClient.RespondDecisionTaskCompleted(respondDecisionTaskCompletedRequest);
}
}
public void Decider()
{
int activityCount = 0;
while (true)
{
Console.WriteLine("Decider: Polling for decision task ...");
PollForDecisionTaskRequest request = new PollForDecisionTaskRequest()
{
Domain = domainName,
TaskList = new TaskList()
{
Name = deciderPollingKey
}
};
PollForDecisionTaskResponse response = swfClient.PollForDecisionTaskAsync(request).Result;
if (response.DecisionTask.TaskToken == null)
{
Console.WriteLine("Decider: NULL");
continue;
}
int completedActivityTaskCount = 0, totalActivityTaskCount = 0;
foreach (HistoryEvent e in response.DecisionTask.Events)
{
Console.WriteLine("Decider: EventType - " + e.EventType +
", EventId - " + e.EventId);
if (e.EventType == "ActivityTaskCompleted")
{
completedActivityTaskCount++;
}
if (e.EventType.Value.StartsWith("Activity"))
{
totalActivityTaskCount++;
}
}
Console.WriteLine(".... completedCount=" + completedActivityTaskCount);
List <Decision> decisions = new List <Decision>();
if (totalActivityTaskCount == 0)
{
ScheduleActivity("Activity1", decisions);
activityCount = 4;
}
else if (completedActivityTaskCount == activityCount)
{
Decision decision = new Decision()
{
DecisionType = DecisionType.CompleteWorkflowExecution,
CompleteWorkflowExecutionDecisionAttributes =
new CompleteWorkflowExecutionDecisionAttributes
{
Result = "{\"Result\":\"WF Complete!\"}"
}
};
decisions.Add(decision);
Console.WriteLine("Worflow Complete");
}
RespondDecisionTaskCompletedRequest respondDecisionTaskCompletedRequest =
new RespondDecisionTaskCompletedRequest()
{
Decisions = decisions,
TaskToken = response.DecisionTask.TaskToken
};
swfClient.RespondDecisionTaskCompletedAsync(respondDecisionTaskCompletedRequest);
}
}
/// <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.");
}
protected override async Task <Workflow> GetCurrentContext()
{
Workflow workflow = null;
IList <Activity> activityList = new List <Activity>();
PollForDecisionTaskResponse decisionTaskResponse = null;
List <HistoryEvent> historyEvents = new List <HistoryEvent>();
string taskToken = null;
string nextPageToken = null;
do
{
var decisionTaskRequest = new PollForDecisionTaskRequest
{
Domain = Constants.LAMBDA_BIZ_DOMAIN,
Identity = Guid.NewGuid().ToString(),
TaskList = new TaskList
{
Name = Constants.LAMBDA_BIZ_TASK_LIST + _orchestrationId
},
NextPageToken = nextPageToken
};
decisionTaskResponse = await _amazonSimpleWorkflowClient.PollForDecisionTaskAsync(decisionTaskRequest);
taskToken = decisionTaskResponse.DecisionTask.TaskToken;
if (!string.IsNullOrEmpty(taskToken))
{
var decisionTask = decisionTaskResponse.DecisionTask;
foreach (HistoryEvent historyEvent in decisionTask.Events)
{
historyEvents.Add(historyEvent);
}
}
}while (!string.IsNullOrEmpty(nextPageToken = decisionTaskResponse.DecisionTask.NextPageToken));
if (historyEvents.Count > 0)
{
if (workflow == null)
{
workflow = new Workflow();
workflow.ReferenceToken = taskToken;
if (_store != null)
{
if (!await _store.StoreExistsAsync())
{
await _store.CreateStoreAsync();
}
}
}
foreach (HistoryEvent historyEvent in historyEvents)
{
if (historyEvent.EventType == EventType.WorkflowExecutionSignaled)
{
var activity = FindActivity(Model.ActivityType.Event, historyEvent.WorkflowExecutionSignaledEventAttributes.SignalName, activityList);
if (activity == null)
{
activity = new Activity
{
Result = historyEvent.WorkflowExecutionSignaledEventAttributes.Input,
Status = Status.SUCCEEDED,
ActivityType = Model.ActivityType.Event,
Name = historyEvent.WorkflowExecutionSignaledEventAttributes.SignalName,
ScheduledId = historyEvent.WorkflowExecutionSignaledEventAttributes.SignalName,
UniqueId = historyEvent.WorkflowExecutionSignaledEventAttributes.SignalName,
SucceededDateTime = historyEvent.EventTimestamp
};
activityList.Add(activity);
}
}
if (historyEvent.EventType == EventType.WorkflowExecutionStarted)
{
workflow.Status = Status.STARTED;
workflow.OrchestrationId =
historyEvent.WorkflowExecutionStartedEventAttributes.TaskList.Name.Replace(Constants.LAMBDA_BIZ_TASK_LIST, string.Empty);
workflow.StartedDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.WorkflowExecutionFailed)
{
workflow.Status = Status.FAILED;
workflow.FailedDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.WorkflowExecutionCompleted)
{
workflow.Status = Status.SUCCEEDED;
workflow.SucceededDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.LambdaFunctionScheduled)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.LambdaFunctionScheduledEventAttributes.Id.ToString(), activityList);
if (activity == null)
{
activity = new Activity
{
ActivityType = Model.ActivityType.Task,
Name = historyEvent.LambdaFunctionScheduledEventAttributes.Name,
ScheduledId = historyEvent.EventId.ToString(),
UniqueId = historyEvent.LambdaFunctionScheduledEventAttributes.Control,
Status = Status.SCHEDULED,
ScheduledDateTime = historyEvent.EventTimestamp
};
activityList.Add(activity);
}
}
if (historyEvent.EventType == EventType.StartLambdaFunctionFailed)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.StartLambdaFunctionFailedEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Result = historyEvent.StartLambdaFunctionFailedEventAttributes.Message;
activity.FailureDetails = historyEvent.StartLambdaFunctionFailedEventAttributes.Cause;
activity.Status = Status.FAILED;
activity.FailedDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.LambdaFunctionStarted)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.LambdaFunctionStartedEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Status = Status.STARTED;
activity.StartedDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.LambdaFunctionCompleted)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.LambdaFunctionCompletedEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Result = historyEvent.LambdaFunctionCompletedEventAttributes.Result;
activity.Status = Status.SUCCEEDED;
activity.SucceededDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.LambdaFunctionFailed)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.LambdaFunctionFailedEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Result = historyEvent.LambdaFunctionFailedEventAttributes.Details;
activity.FailureDetails = historyEvent.LambdaFunctionFailedEventAttributes.Reason;
activity.Status = Status.FAILED;
activity.FailedDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.LambdaFunctionTimedOut)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.LambdaFunctionTimedOutEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Status = Status.TIMEOUT;
activity.TmedOutDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.TimerStarted)
{
var activity = new Activity
{
ActivityType = Model.ActivityType.Timer,
Name = historyEvent.TimerStartedEventAttributes.TimerId,
ScheduledId = historyEvent.EventId.ToString(),
UniqueId = historyEvent.TimerStartedEventAttributes.TimerId,
Status = Status.STARTED,
StartedDateTime = historyEvent.EventTimestamp
};
activityList.Add(activity);
}
if (historyEvent.EventType == EventType.TimerFired)
{
var activity = FindActivity(Model.ActivityType.Timer, historyEvent.TimerFiredEventAttributes.StartedEventId.ToString(), activityList);
activity.Status = Status.SUCCEEDED;
activity.SucceededDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.ActivityTaskScheduled)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.ActivityTaskScheduledEventAttributes.ActivityId, activityList);
if (activity == null)
{
activity = new Activity
{
ActivityType = Model.ActivityType.Task,
Name = historyEvent.ActivityTaskScheduledEventAttributes.ActivityType.Name,
ScheduledId = historyEvent.EventId.ToString(),
UniqueId = historyEvent.ActivityTaskScheduledEventAttributes.Control,
Status = Status.SCHEDULED,
ScheduledDateTime = historyEvent.EventTimestamp
};
activityList.Add(activity);
}
}
if (historyEvent.EventType == EventType.ActivityTaskStarted)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.ActivityTaskStartedEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Status = Status.STARTED;
activity.StartedDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.ActivityTaskFailed)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.ActivityTaskFailedEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Result = historyEvent.ActivityTaskFailedEventAttributes.Details;
activity.Status = Status.FAILED;
activity.FailedDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.ActivityTaskCompleted)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.ActivityTaskCompletedEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Result = historyEvent.ActivityTaskCompletedEventAttributes.Result;
activity.Status = Status.SUCCEEDED;
activity.SucceededDateTime = historyEvent.EventTimestamp;
}
if (historyEvent.EventType == EventType.ActivityTaskTimedOut)
{
var activity = FindActivity(Model.ActivityType.Task, historyEvent.ActivityTaskTimedOutEventAttributes.ScheduledEventId.ToString(), activityList);
activity.Status = Status.TIMEOUT;
activity.TmedOutDateTime = historyEvent.EventTimestamp;
}
}
workflow.Activities = activityList;
Task loggingTask = _store.LogStateAsync(workflow);
}
return(workflow);
}
