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Configuration
Matias Fontanini edited this page Apr 29, 2017
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1 revision
Configuration objects allow easily configuring your consumers/producers. They allow setting parameters on librdkafka's configuration handles while allowing to use types such as integral values, strings and bools as values.
Example:
// Build a configuration to be used on e.g. a consumer/producer
Configuration config = {
{ "metadata.broker.list", "kafka-server:9092" },
{ "enable.auto.commit", false },
{ "queue.buffering.max.ms", 50 }
};
// Build a topic configuration
TopicConfiguration topic_config = {
{ "auto.offset.reset", "smallest" }
};
// Now configure it to be the default topic config
config.set_default_topic_config(topic_config);Configuration objects support configuring callbacks that will later be used when consuming/producing messages. These all take std::functions as their arguments so you can use any functor that has a valid signature:
Configuration config = ...;
// Set the offset commit callback (maps to rd_kafka_conf_set_offset_commit_cb).
config.set_offset_commit_callback([](Consumer& consumer, Error error,
const TopicPartitionList& topic_partitions) {
// ....
});