@ChannelHandler.Sharable public class ProtobufDecoderNano extends MessageToMessageDecoder<ByteBuf>
ByteBuf解码为Google Protocol Buffers MessageNano 。
请注意，如果您正在使用基于流的传输（如TCP / IP），则必须将此解码器与ByteToMessageDecoder （如LengthFieldBasedFrameDecoder）一起使用。
TCP / IP的典型设置是：
ChannelPipeline pipeline = ...;
// Decoders
pipeline.addLast("frameDecoder",
new LengthFieldBasedFrameDecoder(1048576, 0, 4, 0, 4));
pipeline.addLast("protobufDecoder",
new ProtobufDecoderNano(MyMessage.getDefaultInstance()));
// Encoder
pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));
pipeline.addLast("protobufEncoder", new ProtobufEncoderNano());
然后您可以使用MyMessage而不是ByteBuf作为消息：
void channelRead(ChannelHandlerContext ctx, Object msg) {
MyMessage req = (MyMessage) msg;
MyMessage res = MyMessage.newBuilder().setText(
"Did you say '" + req.getText() + "'?").build();
ch.write(res);
}
ChannelHandler.Sharable| Constructor and Description |
|---|
ProtobufDecoderNano(java.lang.Class<? extends MessageNano> clazz)
创建一个新的实例。
|
| Modifier and Type | Method and Description |
|---|---|
protected void |
decode(ChannelHandlerContext ctx, ByteBuf msg, java.util.List<java.lang.Object> out)
从一条消息解码到另一条消息。
|
acceptInboundMessage, channelReadchannelActive, channelInactive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggeredensureNotSharable, handlerAdded, handlerRemoved, isSharableclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waithandlerAdded, handlerRemovedpublic ProtobufDecoderNano(java.lang.Class<? extends MessageNano> clazz)
protected void decode(ChannelHandlerContext ctx, ByteBuf msg, java.util.List<java.lang.Object> out) throws java.lang.Exception
MessageToMessageDecoder
decode在课堂上
MessageToMessageDecoder<ByteBuf>
ctx - MessageToMessageDecoder所属的ChannelHandlerContext
msg - 解码到另一个的消息
out - 应该添加解码消息的
List
java.lang.Exception - 发生错误时抛出
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