/// <summary>
/// Process activity task
/// </summary>
/// <param name="input">Input for the activity task</param>
/// <returns>Processing result: either an updated SWF activity, or an error message</returns>
private async Task <ProcessSwfActivityResult> ProcessTask(string input)
{
ProcessSwfActivityResult result = new ProcessSwfActivityResult();
try
{
//read SWF activity info
SwfActivity swfActivity = JsonSerializer.Deserialize <SwfActivity>(input);
//based on SWF activity's info create an EMR activity
SingleEmrActivityIterator singleEmrActivityIterator = new SingleEmrActivityIterator(swfActivity);
//Run this activity on EMR Service
using (EmrActivitiesRunner emrRunner = new EmrActivitiesRunner(this.EmrJobLogger, this.EmrJobStateChecker, this.EmrClient, this.Settings, singleEmrActivityIterator))
{
emrRunner.JobFlowId = swfActivity.JobFlowId; //set JobFlowId for the current activity
bool emrJobOk = await emrRunner.Start();
if (emrJobOk)
{
swfActivity.JobFlowId = emrRunner.JobFlowId; //read JobFlowId in case it was changed (for example, during starting a new EMR job)
result.Output = swfActivity;
}
else
{
result.ErrorMessage = emrRunner.ErrorMessage;
}
}
}
catch (Exception ex)
{
result.ErrorMessage = ex.Message;
}
return(result);
}
protected async override void DoWorkSafe()
{
ActivityTask activityTask = await this.Poll();
if (!String.IsNullOrEmpty(activityTask.TaskToken))
{
ProcessSwfActivityResult processResult = await ProcessTask(activityTask.Input);
if (string.IsNullOrEmpty(processResult.ErrorMessage))
{
await CompleteTask(activityTask.TaskToken, processResult.Output);
}
else
{
await FailTask(activityTask.TaskToken, activityTask.Input, processResult.ErrorMessage);
}
}
}
