private void read(final KafkaStream<String, String> stream) {
while (stream.iterator().hasNext()) {
final int phase = phaser.register();
final MessageAndMetadata<String, String> msg = stream.iterator().next();
final long offset = msg.offset();
final long partition = msg.partition();
unacknowledgedOffsets.add(offset);
lastCommittedOffset.compareAndSet(0, offset);
currentPartition.compareAndSet(-1, partition);
final String jsonString = msg.message();
handler.handle(
configuration.getVertxAddress(),
jsonString,
() -> {
unacknowledgedOffsets.remove(offset);
phaser.arriveAndDeregister();
});
if (unacknowledgedOffsets.size() >= configuration.getMaxUnacknowledged()
|| partititionChanged(partition)
|| tooManyUncommittedOffsets(offset)) {
LOG.info(
"Got {} unacknowledged messages, waiting for ACKs in order to commit",
unacknowledgedOffsets.size());
if (!waitForAcks(phase)) {
return;
}
LOG.info("Continuing message processing");
commitOffsetsIfAllAcknowledged(offset);
}
}
}
