@ChannelHandler.Sharable public class ProtobufEncoder extends OneToOneEncoder
Message
and MessageLite
into a
ChannelBuffer
. A typical setup for TCP/IP would be:
and then you can use aChannelPipeline
pipeline = ...; // Decoders pipeline.addLast("frameDecoder", newLengthFieldBasedFrameDecoder
(1048576, 0, 4, 0, 4)); pipeline.addLast("protobufDecoder", newProtobufDecoder
(MyMessage.getDefaultInstance())); // Encoder pipeline.addLast("frameEncoder", newLengthFieldPrepender
(4)); pipeline.addLast("protobufEncoder", newProtobufEncoder
());
MyMessage
instead of a ChannelBuffer
as a message:
void messageReceived(ChannelHandlerContext
ctx,MessageEvent
e) { MyMessage req = (MyMessage) e.getMessage(); MyMessage res = MyMessage.newBuilder().setText( "Did you say '" + req.getText() + "'?").build(); ch.write(res); }
ChannelHandler.Sharable
Constructor and Description |
---|
ProtobufEncoder() |
Modifier and Type | Method and Description |
---|---|
protected Object |
encode(ChannelHandlerContext ctx,
Channel channel,
Object msg)
Transforms the specified message into another message and return the
transformed message.
|
doEncode, handleDownstream
protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception
OneToOneEncoder
null
, unlike
you can in OneToOneDecoder.decode(ChannelHandlerContext, Channel, Object)
;
you must return something, at least ChannelBuffers.EMPTY_BUFFER
.encode
in class OneToOneEncoder
Exception
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