/// <summary>
/// Initializes a new Producer instance.
/// </summary>
/// <param name="config">
/// librdkafka configuration parameters (refer to https://github.com/edenhill/librdkafka/blob/master/CONFIGURATION.md)
/// TODO: Link to confluent-kafka-dotnet page with dotnet specific parameters also (i.e. default.topic.config).
/// </param>
/// <param name="manualPoll">
/// If true, does not start a dedicated polling thread to trigger events or receive delivery reports -
/// you must call the Poll method periodically instead.
/// </param>
/// <param name="disableDeliveryReports">
/// If true, disables notification of delivery reports. Note: if set to true and you use a ProduceAsync variant that return
/// a Task, the Tasks will never complete. Generally you should leave this parameter as false. Set it to true for "fire and
/// forget" semantics and a small boost in performance.
/// </param>
public Producer(IEnumerable <KeyValuePair <string, object> > config, bool manualPoll = false, bool disableDeliveryReports = false)
{
this.topicConfig = (IEnumerable <KeyValuePair <string, object> >)config.FirstOrDefault(prop => prop.Key == "default.topic.config").Value;
this.manualPoll = manualPoll;
this.disableDeliveryReports = disableDeliveryReports;
var configHandle = SafeConfigHandle.Create();
config
.Where(prop => prop.Key != "default.topic.config")
.ToList()
.ForEach((kvp) => { configHandle.Set(kvp.Key, kvp.Value.ToString()); });
IntPtr configPtr = configHandle.DangerousGetHandle();
if (!disableDeliveryReports)
{
LibRdKafka.conf_set_dr_msg_cb(configPtr, DeliveryReportCallback);
}
// Explicitly keep references to delegates so they are not reclaimed by the GC.
errorDelegate = ErrorCallback;
logDelegate = LogCallback;
statsDelegate = StatsCallback;
// TODO: provide some mechanism whereby calls to the error and log callbacks are cached until
// such time as event handlers have had a chance to be registered.
LibRdKafka.conf_set_error_cb(configPtr, errorDelegate);
LibRdKafka.conf_set_log_cb(configPtr, logDelegate);
LibRdKafka.conf_set_stats_cb(configPtr, statsDelegate);
this.kafkaHandle = SafeKafkaHandle.Create(RdKafkaType.Producer, configPtr);
configHandle.SetHandleAsInvalid(); // config object is no longer useable.
if (!manualPoll)
{
callbackCts = new CancellationTokenSource();
callbackTask = StartPollTask(callbackCts.Token);
}
}
internal static extern void rd_kafka_conf_set_stats_cb(IntPtr conf, LibRdKafka.StatsDelegate stats_cb);
