Class ProtobufVarint32FrameDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder

All Implemented Interfaces:

ChannelHandler, ChannelInboundHandler

public class ProtobufVarint32FrameDecoder
extends ByteToMessageDecoder

A decoder that splits the received ByteBufs dynamically by the value of the Google Protocol Buffers Base 128 Varints integer length field in the message. For example:

BEFORE DECODE (302 bytes)       AFTER DECODE (300 bytes)
+--------+---------------+      +---------------+
| Length | Protobuf Data |----->| Protobuf Data |
| 0xAC02 |  (300 bytes)  |      |  (300 bytes)  |
+--------+---------------+      +---------------+

See Also:

• CodedInputStream
• CodedInputByteBufferNano

Nested Class Summary

Nested classes/interfaces inherited from class ByteToMessageDecoder

ByteToMessageDecoder.Cumulator

Nested classes/interfaces inherited from interface ChannelHandler

ChannelHandler.Sharable

Field Summary

Fields inherited from class ByteToMessageDecoder

COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors

Constructor	Description
ProtobufVarint32FrameDecoder()	Creates a new instance with no frame length limit.
ProtobufVarint32FrameDecoder(int maxFrameLength)	Creates a new instance with the specified maximum frame length.

Method Summary

Modifier and Type	Method	Description
protected void	decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out)	Decode the from one ByteBuf to an other.

Methods inherited from class ByteToMessageDecoder

actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered

Methods inherited from class ChannelInboundHandlerAdapter

channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

Methods inherited from class ChannelHandlerAdapter

ensureNotSharable, handlerAdded, isSharable

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ChannelHandler

handlerAdded

Constructor Details

ProtobufVarint32FrameDecoder

public ProtobufVarint32FrameDecoder()

Creates a new instance with no frame length limit.

ProtobufVarint32FrameDecoder

public ProtobufVarint32FrameDecoder(int maxFrameLength)

Creates a new instance with the specified maximum frame length.

Parameters:

maxFrameLength - the maximum length of the frame. If the length exceeds this value, TooLongFrameException will be thrown.

Method Details

decode

protected void decode(ChannelHandlerContext ctx,
 ByteBuf in,
 List<Object> out)
               throws Exception

Description copied from class: ByteToMessageDecoder

Decode the from one ByteBuf to an other. This method will be called till either the input ByteBuf has nothing to read when return from this method or till nothing was read from the input ByteBuf.

Specified by:

decode in class ByteToMessageDecoder

Parameters:

ctx - the ChannelHandlerContext which this ByteToMessageDecoder belongs to

in - the ByteBuf from which to read data

out - the List to which decoded messages should be added

Throws:

Exception - is thrown if an error occurs