/// <summary>
/// Gets a list of valid offsets (up to maxSize) before the given time.
/// </summary>
/// <param name="request">
/// The offset request.
/// </param>
/// <returns>
/// The list of offsets, in descending order.
/// </returns>
public IList <long> GetOffsetsBefore(OffsetRequest request)
{
KafkaConnection conn = null;
int size = 0;
var result = new List <long>();
short tryCounter = 1;
while (tryCounter <= this.config.NumberOfTries)
{
try
{
conn = KafkaClusterConnectionPool.GetConnection(this.host, this.port);
conn.Write(request);
size = conn.Reader.ReadInt32();
if (size > 0)
{
short errorCode = conn.Reader.ReadInt16();
if (errorCode != ErrorMapping.NoError)
{
throw new KafkaException(errorCode);
}
int count = conn.Reader.ReadInt32();
for (int i = 0; i < count; i++)
{
result.Add(conn.Reader.ReadInt64());
}
}
break;
}
catch (Exception ex)
{
//// if maximum number of tries reached
if (tryCounter == this.config.NumberOfTries)
{
throw;
}
tryCounter++;
Logger.InfoFormat(CultureInfo.CurrentCulture, "GetOffsetsBefore reconnect due to {0}", ex);
}
finally
{
KafkaClusterConnectionPool.ReleaseConnection(conn);
}
}
return(result);
}
/// <summary>
/// Combine multiple fetch requests in one call.
/// </summary>
/// <param name="request">
/// The list of fetch requests.
/// </param>
/// <returns>
/// A list of sets of fetched messages.
/// </returns>
/// <remarks>
/// Offset is passed in on every request, allowing the user to maintain this metadata
/// however they choose.
/// </remarks>
public IList <BufferedMessageSet> MultiFetch(MultiFetchRequest request)
{
KafkaConnection conn = null;
int size = 0;
var result = new List <BufferedMessageSet>();
short tryCounter = 1;
while (tryCounter <= this.config.NumberOfTries)
{
try
{
conn = KafkaClusterConnectionPool.GetConnection(this.host, this.port);
conn.Write(request);
size = conn.Reader.ReadInt32();
result = (BufferedMessageSet.ParseMultiFrom(conn.Reader,
size,
request.ConsumerRequests.Count,
request.ConsumerRequests.Select(x => x.Offset).ToList())) as List <BufferedMessageSet>;
break;
}
catch (Exception ex)
{
// if maximum number of tries reached
if (tryCounter == this.config.NumberOfTries)
{
throw;
}
tryCounter++;
Logger.InfoFormat(CultureInfo.CurrentCulture, "MultiFetch reconnect due to {0}", ex);
}
finally
{
KafkaClusterConnectionPool.ReleaseConnection(conn);
}
}
return(result);
}
public void TestCorrectConnectionRetrieval()
{
var consumerConfig1 = this.ConsumerConfig1;
var consumerConfig2 = this.ConsumerConfig2;
var consumerConfig3 = this.ConsumerConfig3;
//popluate pool
KafkaClusterConnectionPool.ReleaseConnection(KafkaClusterConnectionPool.GetConnection(consumerConfig1.Broker.Host, consumerConfig1.Broker.Port));
KafkaClusterConnectionPool.ReleaseConnection(KafkaClusterConnectionPool.GetConnection(consumerConfig2.Broker.Host, consumerConfig2.Broker.Port));
KafkaClusterConnectionPool.ReleaseConnection(KafkaClusterConnectionPool.GetConnection(consumerConfig3.Broker.Host, consumerConfig3.Broker.Port));
//Retrieve connections
var pooledConnection1 = KafkaClusterConnectionPool.GetConnection(consumerConfig1.Broker.Host, consumerConfig1.Broker.Port);
var pooledConnection2 = KafkaClusterConnectionPool.GetConnection(consumerConfig2.Broker.Host, consumerConfig2.Broker.Port);
var pooledConnection3 = KafkaClusterConnectionPool.GetConnection(consumerConfig3.Broker.Host, consumerConfig3.Broker.Port);
Assert.AreEqual(consumerConfig1.Broker.Host, pooledConnection1.Server);
Assert.AreEqual(consumerConfig1.Broker.Port, pooledConnection1.Port);
Assert.AreEqual(consumerConfig2.Broker.Host, pooledConnection2.Server);
Assert.AreEqual(consumerConfig2.Broker.Port, pooledConnection2.Port);
Assert.AreEqual(consumerConfig3.Broker.Host, pooledConnection3.Server);
Assert.AreEqual(consumerConfig3.Broker.Port, pooledConnection3.Port);
}
public void TestPoolOverload()
{
var consumerConfig1 = this.ConsumerConfig1;
var connectionCount = CONNECTION_POOL_SIZE + 1;
for (int i = 0; i < connectionCount; i++)
{
connections.Add(KafkaClusterConnectionPool.GetConnection(consumerConfig1.Broker.Host, consumerConfig1.Broker.Port));
}
try
{
for (int i = 0; i < connectionCount; i++)
{
KafkaClusterConnectionPool.ReleaseConnection(connections[i]);
}
}
catch (KafkaConnectionPoolException ex)
{
//This is the expected result
}
}
/// <summary>
/// Fetch a set of messages from a topic.
/// </summary>
/// <param name="request">
/// Specifies the topic name, topic partition, starting byte offset, maximum bytes to be fetched.
/// </param>
/// <returns>
/// A set of fetched messages.
/// </returns>
/// <remarks>
/// Offset is passed in on every request, allowing the user to maintain this metadata
/// however they choose.
/// </remarks>
public BufferedMessageSet Fetch(FetchRequest request)
{
short tryCounter = 1;
KafkaConnection conn = null;
int size = 0;
BufferedMessageSet messageSet = null;
while (tryCounter <= this.config.NumberOfTries)
{
try
{
conn = KafkaClusterConnectionPool.GetConnection(this.host, this.port);
conn.Write(request);
size = conn.Reader.ReadInt32();
messageSet = BufferedMessageSet.ParseFrom(conn.Reader, size, request.Offset);
break;
}
catch (Exception ex)
{
//// if maximum number of tries reached
if (tryCounter == this.config.NumberOfTries)
{
throw;
}
tryCounter++;
Logger.InfoFormat(CultureInfo.CurrentCulture, "Fetch reconnect due to {0}", ex);
}
finally
{
KafkaClusterConnectionPool.ReleaseConnection(conn);
}
}
return(messageSet);
}