Messages not reaching destination queue when using ServerInitializerFactory Netty 4 - grails

Question

I am using apache camel netty4 in grails and I have declared mycustom ServerInitializerFactory as follows
public class MyServerInitializerFactory extends ServerInitializerFactory {
private int maxLineSize = 1048576;
NettyConsumer nettyConsumer
public MimacsServerInitializerFactory() {}
#Override
protected void initChannel(Channel channel) throws Exception {
ChannelPipeline pipeline = channel.pipeline()
pipeline.addLast("logger", new LoggingHandler(LogLevel.INFO))
pipeline.addLast("framer", new LengthFieldBasedFrameDecoder(ByteOrder.LITTLE_ENDIAN, maxLineSize, 2, 2, 6, 0, false))
pipeline.addLast("decoder", new MfuDecoder())
pipeline.addLast("encoder", new MfuEncoder())
pipeline.addLast("handler", new MyServerHandler())
}
}
I have a route which I setup as follows in my routebuilder.
from('netty4:tcp://192.168.254.3:553?serverInitializerFactory=#sif&keepAlive=true&sync=true&allowDefaultCodec=false').to('activemq:queue:Tracking.Queue')
My Camel Context is setup in the BootStrap.groovy as follows
def serverInitializerFactory = new MyServerInitializerFactory()
SimpleRegistry registry = new SimpleRegistry()
registry.put("sif", serverInitializerFactory)
CamelContext camelContext = new DefaultCamelContext(registry)
camelContext.addComponent("activemq", activeMQComponent.activeMQComponent("failover:tcp://localhost:61616"))
camelContext.addRoutes new TrackingMessageRoute()
camelContext.start()
When I run my app, my route is started and my framer, decoder, handler and encoders are all invoked but messages do not reach the Tracking. Queue and responses do not get back to the client.
If I do not use serverInitializerFactory in the netty url and user encoders and decoders instead, My messages are hitting the queue but I lose control of the acknowledgement that I want to sent for each type of message that I receive. It seems activemq tries to sent its own response which is rejected by my encoder.
Am I supposed to then write code to send again or is there something I am missing?

Answer 1

You need to add a handler with the consumer so it can be routed, see the unit test how its done:
https://github.com/apache/camel/blob/master/components/camel-netty4/src/test/java/org/apache/camel/component/netty4/NettyCustomPipelineFactoryAsynchTest.java#L112

Answer 2

I managed to get around that problem. In my channelRead0 method. I added the following lines
Exchange exchange = this.consumer.getEndpoint().createExchange(ctx, msg);
where ctx is the ChannelContextHandler and msg is the Message Object, the two are both parameters of the channelRead0 method.
I also added the following lines
this.consumer.createUoW(exchange);
and after my handling code I inserted the following line
this.consumer.doneUoW(exchange);
and everything works like a charm.