public void WriteStreamState(StreamState state)
{
if (state == null)
throw new ArgumentNullException("state");
foreach (var pair in state.OffsetByPartition)
WriteStreamState(state.Topic, state.Group, pair.Key, pair.Value);
}
/// <summary>
/// Write state for only specified partition.
/// </summary>
public void WriteStreamState(StreamState state, Int32 partition)
{
WriteStreamState(state.Topic, state.Group, partition, state.OffsetByPartition[partition]);
}
private void Start()
{
_started = true;
_stateStorage = new ConsumerStateStorage(_stateStorageDirectory);
_streamState = _stateStorage.ReadStreamState(Topic, "default-group", Partitions);
var task = Task.Factory.StartNew(() =>
{
var consumer = new PartitionConsumer(_brokerAddress, _context);
var offsetByPartition = new Dictionary<Int32, Int32>();
foreach (var pair in _streamState.OffsetByPartition)
offsetByPartition.Add(pair.Key, pair.Value);
while(true)
{
// If we already have enough messages in queue - wait
if (Messages.Count > 100)
continue;
var result = consumer.Load(Topic, offsetByPartition, 300);
var messageCount = 0;
foreach (var tuple in result)
{
Messages.Enqueue(tuple);
offsetByPartition[tuple.Item1] += Message.CalculateOnDiskMessageLength(tuple.Item2.Payload.Length);
messageCount++;
}
// Wait for 500 msecond, if there is no new messages
// This value should be configurable
if (messageCount == 0)
Thread.Sleep(500);
}
});
}