First, a couple of thank yous several weeks in the making:
Thank you to Claus (as always) for help regarding replacing camel-rabbitmq with
a custom class. Indeed, I only needed to do a write. So using
'to("bean:myBean?method=process)' worked perfectly.
Thank you to Zoran for advice on Spring injection vs. Component Scan. I never
was able to get beans in the Spring config auto-wired, so I had to do the
manual steps of getting the Spring context, getting the bean, and then setting
the bean where it needed to be. A bit ugly, but only a few lines of code. It
works, so I'm leaving it alone for now.
Now on to my most recent hurdle...
I'm trying to write a protobuf over UDP to a server (a non-Camel app written in
C++) expecting it serialized into a byte array.
The problem is that the only write that makes it to the server seems to be
serialized incorrectly. Conversely, when I think I've correctly serialized it,
nothing seems to get written to the wire.
The route below is the one that makes it to the server. When I do a tcpdump on
the server's side, however, I can see that the payload is about 35-40 bytes
bigger than what the protobuf says its serialized size should be:
from("direct:protobuf")
.marshal().protobuf()
.convertBodyTo(String.class, "UTF-8") // needed, else to(netty4:udp) hangs
.to("netty4:udp://host:port?udpConnectionlessSending=true&sync=false");
I immediately recognized this as probably being a "default codec" problem,
similar to what I recently encountered when I was writing some JSON over UDP
with netty4.
So I tried the following, but nothing was written over the wire:
.to("netty4:udp://host:port?udpConnectionlessSending=true&sync=false&allowDefaultCodec=false");
I tried about a half dozen combinations: marshalling / not marshalling,
convertBodyTo() / no convertBodyTo(), allowDefaultCode = false / true, etc.
Nothing was working. And then I somehow stumbled upon 'udpByteArrayCodec' in
the docs and thought I'd found it!
However, this didn't send anything to the wire either:
.to("netty4:udp://host:post?udpConnectionlessSending=true&sync=false&udpByteArrayCodec=true");
Neither did this:
.to("netty4:udp://host:port?udpConnectionlessSending=true&sync=false&udpByteArrayCodec=true&allowDefaultCodec=false");
Only the original route resulted in *anything* being written across the wire
for the server to see:
.to("netty4:udp://host:port?udpConnectionlessSending=true&sync=false");
Does anyone know what else I should try?
I have never had any luck trying to install a non-default encoder/decoder, but
in this case I don't think I even need it. I just need to serialize the
protobuf to a byte array, and it seems that this 'udpByteArrayCodec' is exactly
what I need. So how should I be using it? What could be preventing anything
from appearing over the wire?
Thank you so much as always!
Ron
