Hi,
I'd like to use a MessageToMessageDecoder to transform from one type to
another while sending a message from a client to a remote server. The
MessageToMessage Encoder/Decoder allow this to be accomplished easily.
When using UDP and an AddressedEnvelope to preserve remote address info,
this is not the case.
The following snippet shows a simplified channel pipeline to hopefully
illustrate my use case.
ChannelInitializer<DatagramChannel> datagramChannelInitializer = new
ChannelInitializer<DatagramChannel>() {
@Override
public void initChannel(DatagramChannel ch) throws
Exception {
ch.pipeline().addLast(new
DatagramPacketDecoder(new Type1Decoder()))
.addLast(new Type2MessageToMessageDecoder())
.addLast(new Type2MessageToMessageEncoder())
.addLast(new DatagramPacketEncoder<>(new
Type1Encoder()));
}
}
During encoding, I wrap my type1 payload in an AddressedEnvelope to specify
the remote address. The Type2MessageToMessageEncoder is never invoked
because AddressedEnvelope<Type1, SocketAddress> does not match Type2. I
tried to create my own class AddressedEnvelopeMessageToMessageEncoder
similar to the DatagramPacketEncoder which delegates to a provided encoder
but the encode method is not visible.
What is the recommended approach for this kind of use case? Any help
appreciated.
Thanks,
Joe
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