/// <summary>
/// Retrieves the next page of history from SWF.
/// </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.PollForDecisionTask(request).DecisionTask;
}
catch (Exception ex)
{
Console.Error.WriteLine("Poll request failed with exception: " + ex);
pollFailed = true;
}
currentTry += 1;
} while (pollFailed && currentTry <= retryCount);
return(_lastResponse.Events);
}
IEnumerable <PollForDecisionTaskResponse> IPaginator <PollForDecisionTaskResponse> .Paginate()
{
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 = _client.PollForDecisionTask(_request);
nextPageToken = response.DecisionTask.NextPageToken;
yield return(response);
}while (nextPageToken != null);
}
// 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
while (true)
{
Console.WriteLine("DECIDER: Polling for decision task ...");
var request = new PollForDecisionTaskRequest()
{
Domain = domainName,
TaskList = new TaskList()
{
Name = "SwfDemo"
}
};
var response = SwfDeciderClient.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}");
var 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)
{
var decision = new Decision()
{
DecisionType = DecisionType.CompleteWorkflowExecution,
CompleteWorkflowExecutionDecisionAttributes =
new CompleteWorkflowExecutionDecisionAttributes
{
Result = "{\"Result\":\"WF Complete!\"}"
}
};
decisions.Add(decision);
Console.WriteLine("DECIDER: WORKFLOW COMPLETE");
}
var respondDecisionTaskCompletedRequest =
new RespondDecisionTaskCompletedRequest()
{
Decisions = decisions,
TaskToken = response.DecisionTask.TaskToken
};
SwfDeciderClient.RespondDecisionTaskCompleted(respondDecisionTaskCompletedRequest);
}
}
// 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);
}
}