private Message<?> getAMessageFrom(KafkaMessageDrivenChannelAdapter adapter, Method toMessage)
throws Exception {
KafkaMessageMetadata meta = mock(KafkaMessageMetadata.class);
Partition partition = mock(Partition.class);
when(partition.getTopic()).thenReturn("topic");
when(partition.getId()).thenReturn(42);
when(meta.getPartition()).thenReturn(partition);
when(meta.getOffset()).thenReturn(1L);
when(meta.getNextOffset()).thenReturn(2L);
Acknowledgment ack = mock(Acknowledgment.class);
return (Message<?>) toMessage.invoke(adapter, "foo", "bar", meta, ack);
}
private Binding<MessageChannel> createKafkaConsumer(
String name,
final MessageChannel moduleInputChannel,
Properties properties,
String group,
long referencePoint) {
validateConsumerProperties(groupedName(name, group), properties, SUPPORTED_CONSUMER_PROPERTIES);
KafkaPropertiesAccessor accessor = new KafkaPropertiesAccessor(properties);
int maxConcurrency = accessor.getConcurrency(defaultConcurrency);
String topic = escapeTopicName(name);
int numPartitions = accessor.getNumberOfKafkaPartitionsForConsumer();
Collection<Partition> allPartitions =
ensureTopicCreated(topic, numPartitions, defaultReplicationFactor);
Decoder<byte[]> valueDecoder = new DefaultDecoder(null);
Decoder<byte[]> keyDecoder = new DefaultDecoder(null);
Collection<Partition> listenedPartitions;
int moduleCount = accessor.getCount();
if (moduleCount == 1) {
listenedPartitions = allPartitions;
} else {
listenedPartitions = new ArrayList<Partition>();
for (Partition partition : allPartitions) {
// divide partitions across modules
if (accessor.getPartitionIndex() != -1) {
if ((partition.getId() % moduleCount) == accessor.getPartitionIndex()) {
listenedPartitions.add(partition);
}
} else {
int moduleSequence = accessor.getSequence();
if (moduleCount == 0) {
throw new IllegalArgumentException(
"The Kafka transport does not support 0-count modules");
} else {
// sequence numbers are zero-based
if ((partition.getId() % moduleCount) == (moduleSequence - 1)) {
listenedPartitions.add(partition);
}
}
}
}
}
ReceivingHandler rh = new ReceivingHandler();
rh.setOutputChannel(moduleInputChannel);
final FixedSubscriberChannel bridge = new FixedSubscriberChannel(rh);
bridge.setBeanName("bridge." + name);
final KafkaMessageListenerContainer messageListenerContainer =
createMessageListenerContainer(
accessor, group, maxConcurrency, listenedPartitions, referencePoint);
final KafkaMessageDrivenChannelAdapter kafkaMessageDrivenChannelAdapter =
new KafkaMessageDrivenChannelAdapter(messageListenerContainer);
kafkaMessageDrivenChannelAdapter.setBeanFactory(this.getBeanFactory());
kafkaMessageDrivenChannelAdapter.setKeyDecoder(keyDecoder);
kafkaMessageDrivenChannelAdapter.setPayloadDecoder(valueDecoder);
kafkaMessageDrivenChannelAdapter.setOutputChannel(bridge);
kafkaMessageDrivenChannelAdapter.setAutoCommitOffset(
accessor.getDefaultAutoCommitEnabled(this.defaultAutoCommitEnabled));
kafkaMessageDrivenChannelAdapter.afterPropertiesSet();
kafkaMessageDrivenChannelAdapter.start();
EventDrivenConsumer edc =
new EventDrivenConsumer(bridge, rh) {
@Override
protected void doStop() {
// stop the offset manager and the channel adapter before unbinding
// this means that the upstream channel adapter has a chance to stop
kafkaMessageDrivenChannelAdapter.stop();
if (messageListenerContainer.getOffsetManager() instanceof DisposableBean) {
try {
((DisposableBean) messageListenerContainer.getOffsetManager()).destroy();
} catch (Exception e) {
logger.error("Error while closing the offset manager", e);
}
}
super.doStop();
}
};
String groupedName = groupedName(name, group);
edc.setBeanName("inbound." + groupedName);
Binding<MessageChannel> consumerBinding =
Binding.forConsumer(name, group, edc, moduleInputChannel, accessor);
addBinding(consumerBinding);
consumerBinding.start();
return consumerBinding;
}
