public override void Open()
{
base.Open();
_currentWatermark = long.MinValue;
_watermarkInterval = ExecutionConfig.AutoWatermarkInterval;
if (_watermarkInterval > 0)
{
var now = ProcessingTimeService.CurrentProcessingTime;
ProcessingTimeService.RegisterTimer <bool>(now + _watermarkInterval, this);
}
}
public virtual void OnProcessingTime(long timestamp)
{
// emit watermark
var newWatermark = UserFunction.CurrentWatermark;
if (newWatermark != null && newWatermark.Timestamp > _currentWatermark)
{
_currentWatermark = newWatermark.Timestamp;
Output.EmitWatermark(newWatermark);
}
// register next timer
var now = ProcessingTimeService.CurrentProcessingTime;
ProcessingTimeService.RegisterTimer <bool>(now + _watermarkInterval, this);
}
