internal override HistoryEvent GetCompletedHistoryEvent(OrchestrationContext context, HistoryEvent taskScheduled)
{
return(context.History.FirstOrDefault(
e => e.EventType == HistoryEventType.EventRaised &&
e.Name == ExternalEventName &&
!e.IsProcessed));
}
internal override HistoryEvent GetCompletedHistoryEvent(OrchestrationContext context, HistoryEvent scheduledHistoryEvent)
{
return(scheduledHistoryEvent == null
? null
: context.History.FirstOrDefault(
e => e.EventType == HistoryEventType.TimerFired &&
e.TimerId == scheduledHistoryEvent.EventId));
}
private static HistoryEvent GetTaskCompletedHistoryEvent(OrchestrationContext context, HistoryEvent taskScheduled)
{
return(taskScheduled == null
? null
: context.History.FirstOrDefault(
e => e.EventType == HistoryEventType.TaskCompleted &&
e.TaskScheduledId == taskScheduled.EventId));
}
private static object GetEventResult(HistoryEvent historyEvent)
{
return(TypeExtensions.ConvertFromJson(historyEvent.Result));
}
// Returns true to indicate that processing this activity invocation should continue.
public static bool Process(
HistoryEvent[] history,
HistoryEvent firstTaskScheduledEvent,
int maxNumberOfAttempts,
Action <string> onSuccess,
Action <string> onFinalFailure)
{
var firstTaskScheduledEventIndex = FindEventIndex(history, firstTaskScheduledEvent);
// Inspired by https://github.com/Azure/azure-functions-durable-js/commit/d789181234ace85df51ce8a849f15b7c8ae2a4f1
var attempt = 1;
HistoryEvent taskScheduled = null;
HistoryEvent taskFailed = null;
HistoryEvent taskRetryTimer = null;
for (var i = firstTaskScheduledEventIndex; i < history.Length; i++)
{
var historyEvent = history[i];
if (historyEvent.IsProcessed)
{
continue;
}
if (taskScheduled == null)
{
if (historyEvent.EventType == HistoryEventType.TaskScheduled)
{
taskScheduled = historyEvent;
}
continue;
}
if (historyEvent.EventType == HistoryEventType.TaskCompleted)
{
if (historyEvent.TaskScheduledId == taskScheduled.EventId)
{
taskScheduled.IsProcessed = true;
historyEvent.IsProcessed = true;
onSuccess(historyEvent.Result);
return(false);
}
else
{
continue;
}
}
if (taskFailed == null)
{
if (historyEvent.EventType == HistoryEventType.TaskFailed)
{
if (historyEvent.TaskScheduledId == taskScheduled.EventId)
{
taskFailed = historyEvent;
}
}
continue;
}
if (taskRetryTimer == null)
{
if (historyEvent.EventType == HistoryEventType.TimerCreated)
{
taskRetryTimer = historyEvent;
}
else
{
continue;
}
}
if (historyEvent.EventType == HistoryEventType.TimerFired)
{
if (historyEvent.TimerId == taskRetryTimer.EventId)
{
taskScheduled.IsProcessed = true;
taskFailed.IsProcessed = true;
taskRetryTimer.IsProcessed = true;
historyEvent.IsProcessed = true;
if (attempt >= maxNumberOfAttempts)
{
onFinalFailure(taskFailed.Reason);
return(false);
}
else
{
attempt++;
taskScheduled = null;
taskFailed = null;
taskRetryTimer = null;
}
}
else
{
continue;
}
}
}
return(true);
}
