Class LineBasedFrameDecoder
- java.lang.Object
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- io.netty.channel.ChannelHandlerAdapter
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- io.netty.channel.ChannelInboundHandlerAdapter
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- io.netty.handler.codec.ByteToMessageDecoder
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- io.netty.handler.codec.LineBasedFrameDecoder
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- All Implemented Interfaces:
ChannelHandler
,ChannelInboundHandler
- Direct Known Subclasses:
SmtpResponseDecoder
public class LineBasedFrameDecoder extends ByteToMessageDecoder
A decoder that splits the receivedByteBuf
s on line endings.Both
"\n"
and"\r\n"
are handled.The byte stream is expected to be in UTF-8 character encoding or ASCII. The current implementation uses direct
byte
tochar
cast and then compares thatchar
to a few low range ASCII characters like'\n'
or'\r'
. UTF-8 is not using low range [0..0x7F] byte values for multibyte codepoint representations therefore fully supported by this implementation.For a more general delimiter-based decoder, see
DelimiterBasedFrameDecoder
.Users should be aware that used as is, the lenient approach on lone
'\n
might result on a parser diffenrencial on line based protocols requiring the use of"\r\n"
delimiters like SMTP and can result in attacks similar to SMTP smuggling. Validating afterward the end of line pattern can be a possible mitigation.
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Nested Class Summary
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Nested classes/interfaces inherited from class io.netty.handler.codec.ByteToMessageDecoder
ByteToMessageDecoder.Cumulator
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Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler
ChannelHandler.Sharable
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Field Summary
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Fields inherited from class io.netty.handler.codec.ByteToMessageDecoder
COMPOSITE_CUMULATOR, MERGE_CUMULATOR
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Constructor Summary
Constructors Constructor Description LineBasedFrameDecoder(int maxLength)
Creates a new decoder.LineBasedFrameDecoder(int maxLength, boolean stripDelimiter, boolean failFast)
Creates a new decoder.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected java.lang.Object
decode(ChannelHandlerContext ctx, ByteBuf buffer)
Create a frame out of theByteBuf
and return it.protected void
decode(ChannelHandlerContext ctx, ByteBuf in, java.util.List<java.lang.Object> out)
Decode the from oneByteBuf
to an other.-
Methods inherited from class io.netty.handler.codec.ByteToMessageDecoder
actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered
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Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter
channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught
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Methods inherited from class io.netty.channel.ChannelHandlerAdapter
ensureNotSharable, handlerAdded, isSharable
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface io.netty.channel.ChannelHandler
handlerAdded
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Constructor Detail
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LineBasedFrameDecoder
public LineBasedFrameDecoder(int maxLength)
Creates a new decoder.- Parameters:
maxLength
- the maximum length of the decoded frame. ATooLongFrameException
is thrown if the length of the frame exceeds this value.
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LineBasedFrameDecoder
public LineBasedFrameDecoder(int maxLength, boolean stripDelimiter, boolean failFast)
Creates a new decoder.- Parameters:
maxLength
- the maximum length of the decoded frame. ATooLongFrameException
is thrown if the length of the frame exceeds this value.stripDelimiter
- whether the decoded frame should strip out the delimiter or notfailFast
- If true, aTooLongFrameException
is thrown as soon as the decoder notices the length of the frame will exceed maxFrameLength regardless of whether the entire frame has been read. If false, aTooLongFrameException
is thrown after the entire frame that exceeds maxFrameLength has been read.
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Method Detail
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decode
protected final void decode(ChannelHandlerContext ctx, ByteBuf in, java.util.List<java.lang.Object> out) throws java.lang.Exception
Description copied from class:ByteToMessageDecoder
Decode the from oneByteBuf
to an other. This method will be called till either the inputByteBuf
has nothing to read when return from this method or till nothing was read from the inputByteBuf
.- Specified by:
decode
in classByteToMessageDecoder
- Parameters:
ctx
- theChannelHandlerContext
which thisByteToMessageDecoder
belongs toin
- theByteBuf
from which to read dataout
- theList
to which decoded messages should be added- Throws:
java.lang.Exception
- is thrown if an error occurs
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decode
protected java.lang.Object decode(ChannelHandlerContext ctx, ByteBuf buffer) throws java.lang.Exception
Create a frame out of theByteBuf
and return it.- Parameters:
ctx
- theChannelHandlerContext
which thisByteToMessageDecoder
belongs tobuffer
- theByteBuf
from which to read data- Returns:
- frame the
ByteBuf
which represent the frame ornull
if no frame could be created. - Throws:
java.lang.Exception
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