net.solarnetwork.io.modbus.tcp.netty

Class TcpModbusMessageDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.ReplayingDecoder<net.solarnetwork.io.modbus.tcp.netty.TcpModbusMessageDecoder.DecoderState>

net.solarnetwork.io.modbus.tcp.netty.TcpModbusMessageDecoder

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelInboundHandler

public class TcpModbusMessageDecoder
extends io.netty.handler.codec.ReplayingDecoder<net.solarnetwork.io.modbus.tcp.netty.TcpModbusMessageDecoder.DecoderState>

Decoder for TCP Modbus messages.

Nested Class Summary

Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder

io.netty.handler.codec.ByteToMessageDecoder.Cumulator

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

io.netty.channel.ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field	Description
static int	FIXED_HEADER_LENGTH	The length of the fixed-length header.

Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder

COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors

Constructor	Description
TcpModbusMessageDecoder(boolean controller, ConcurrentMap<Integer,TcpModbusMessage> pendingMessages)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected void	decode(io.netty.channel.ChannelHandlerContext ctx, io.netty.buffer.ByteBuf in, List<Object> out)

Methods inherited from class io.netty.handler.codec.ReplayingDecoder

callDecode, checkpoint, checkpoint, state, state

Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder

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

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, isSharable

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.netty.channel.ChannelHandler

handlerAdded

Field Detail

FIXED_HEADER_LENGTH

public static final int FIXED_HEADER_LENGTH

The length of the fixed-length header.

See Also:

Constant Field Values

Constructor Detail

TcpModbusMessageDecoder

public TcpModbusMessageDecoder(boolean controller,
                               ConcurrentMap<Integer,TcpModbusMessage> pendingMessages)

Constructor.

Parameters:

controller - true if operating as a controller where decoding is for Modbus response message, or false if operating as a responder where decoding is for Modbus request messages

pendingMessages - a mapping of transaction IDs to associated messages, to handle request and response pairing

Throws:

IllegalArgumentException - if any argument is null

Method Detail

decode

protected void decode(io.netty.channel.ChannelHandlerContext ctx,
                      io.netty.buffer.ByteBuf in,
                      List<Object> out)
               throws Exception

Specified by:

decode in class io.netty.handler.codec.ByteToMessageDecoder

Throws:

Exception