public void Start(CheckpointTag checkpointTag, PartitionState rootPartitionState)
{
_started = true;
_startedAt = checkpointTag;
_lastEvent = checkpointTag;
}
public void StateUpdated(string partition, PartitionState oldState, PartitionState newState)
{
throw new NotImplementedException();
}
/// <summary>
/// Manage beginning of fetch on given topic/partition.
/// If the required offset is positive (i.e. client required a specific known offset
/// to begin from) we issue a Fetch request. If the required offset is Earliest or Latest,
/// we issue an Offset request to discover the offset values before beginning fetch requests.
///
/// This method initializes the PartitionState associated to this topic / partition.
/// </summary>
/// <param name="topicOnOff"></param>
/// <returns></returns>
private async Task HandleStart(TopicOnOff topicOnOff)
{
int[] partitions = null;
if (topicOnOff.Partition >= 0)
{
partitions = _tmpPartitions;
partitions[0] = topicOnOff.Partition;
}
else
{
if (_consumerGroup != null)
{
// (Re)start all assigned partitions
partitions = _partitionAssignments[topicOnOff.Topic].Select(po => po.Partition).ToArray();
}
else
{
while (partitions == null)
{
try
{
partitions = await _cluster.RequireAllPartitionsForTopic(topicOnOff.Topic);
}
catch
{
// Means the cluster is kind of dead, ignore and retry, there's not much else
// to do anyway since we won't be able to send more fetch requests until
// some node is available.
// TODO: be verbose?
}
}
}
}
foreach (int partition in partitions)
{
// Initialize PartitionState if needed
Dictionary <int, PartitionState> states;
if (!_partitionsStates.TryGetValue(topicOnOff.Topic, out states))
{
states = new Dictionary <int, PartitionState>();
_partitionsStates[topicOnOff.Topic] = states;
}
PartitionState state;
if (!states.TryGetValue(partition, out state))
{
state = new PartitionState {
NextOffset = topicOnOff.Offset, Active = false, Postponed = false
};
states[partition] = state;
}
// Already active partitions are not (re)started
if (!state.Active)
{
await HandleStartPartition(partition, state, topicOnOff);
}
else // But we change back their StopAt mark
{
state.StopAt = Offsets.Never;
}
}
}
