public BlockingChannel create(ConsumerGroupId consumerGroupId) {
ConsumerMetadataResponse metadataResponse = readConsumerMetadata(consumerGroupId);
if (metadataResponse.errorCode() != ErrorMapping.NoError()) {
throw new ReadingConsumerMetadataException(metadataResponse.errorCode());
}
Broker coordinator = metadataResponse.coordinator();
BlockingChannel blockingChannel =
new BlockingChannel(
coordinator.host(),
coordinator.port(),
BlockingChannel.UseDefaultBufferSize(),
BlockingChannel.UseDefaultBufferSize(),
readTimeout);
return blockingChannel;
}
private ConsumerMetadataResponse readConsumerMetadata(ConsumerGroupId consumerGroupId) {
BlockingChannel channel =
new BlockingChannel(
broker.getHostText(),
broker.getPort(),
BlockingChannel.UseDefaultBufferSize(),
BlockingChannel.UseDefaultBufferSize(),
readTimeout);
channel.connect();
channel.send(
new ConsumerMetadataRequest(
consumerGroupId.asString(), ConsumerMetadataRequest.CurrentVersion(), 0, "0"));
ConsumerMetadataResponse metadataResponse =
ConsumerMetadataResponse.readFrom(channel.receive().buffer());
channel.disconnect();
return metadataResponse;
}