/// <summary>
/// When processing a stream of an unknown size, it becomes a challenge to know when you have dealt with the
/// last object in that stream. This class utilizes the Dispose() method to indicate that stream processing
/// has completed. This is necessary in order to mark the last message with the isLast header flag
/// set to true. The trick here is to ensure that the streamBuffer is not entirely empty when
/// dispose gets called.
/// </summary>
private void FlushStreamBuffer()
{
while (_queuedEvents.Count > 0)
{
EventStreamQueueItem eventItem = _queuedEvents.Dequeue();
_eventBus.ProcessMessage(eventItem.MessageContext, () =>
{
_eventBus.EnvelopeBus.Send(eventItem.Envelope);
});
}
}
public void Publish(object evt)
{
_log.Debug("enter publish to stream");
string sequence = _sequenceId.ToString();
Envelope env = StreamingEnvelopeHelper.BuildStreamingEnvelope(sequence, _position);
env.SetMessageTopic(Topic);
MessageContext context = new MessageContext(MessageContext.Directions.Out, env, evt);
EventStreamQueueItem eventItem = new EventStreamQueueItem(context);
_log.Debug("buffering event with sequenceId: " + sequence + ", position: " + _position);
_queuedEvents.Enqueue(eventItem);
if (_queuedEvents.Count == (_batchLimit)) {
_log.Debug("flushing " + _batchLimit + " event(s) to stream.");
FlushStreamBuffer();
}
_position++;
}
public void Publish(object evt)
{
_log.Debug("enter publish to stream");
string sequence = _sequenceId.ToString();
Envelope env = StreamingEnvelopeHelper.BuildStreamingEnvelope(sequence, _position);
env.SetMessageTopic(Topic);
MessageContext context = new MessageContext(MessageContext.Directions.Out, env, evt);
EventStreamQueueItem eventItem = new EventStreamQueueItem(context);
_log.Debug("buffering event with sequenceId: " + sequence + ", position: " + _position);
_queuedEvents.Enqueue(eventItem);
if (_queuedEvents.Count == (_batchLimit))
{
_log.Debug("flushing " + _batchLimit + " event(s) to stream.");
FlushStreamBuffer();
}
_position++;
}