org.opendaylight.ovsdb.lib.jsonrpc

Class JsonRpcDecoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.handler.codec.ByteToMessageDecoder

org.opendaylight.ovsdb.lib.jsonrpc.JsonRpcDecoder

All Implemented Interfaces:

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

public class JsonRpcDecoder
extends io.netty.handler.codec.ByteToMessageDecoder

JSON RPC 1.0 compatible decoder capable of decoding JSON messages from a TCP stream. The stream is framed first by inspecting the json for valid end marker (left curly) and is passed to a Json parser (jackson) for converting into an object model.

There are no JSON parsers that I am aware of that does non blocking parsing. This approach avoids having to run json parser over and over again on the entire stream waiting for input. Parser is invoked only when we know of a full JSON message in the stream.

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

COMPOSITE_CUMULATOR, MERGE_CUMULATOR

Constructor Summary

Constructors

Constructor and Description
JsonRpcDecoder(int maxFrameLength)

Method Summary

Methods

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

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

actualReadableBytes, callDecode, 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

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

Constructor Detail

JsonRpcDecoder

public JsonRpcDecoder(int maxFrameLength)

Method Detail

decode

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

Specified by:

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

Throws:

Exception

getRecordsRead

public int getRecordsRead()