public class FixedLengthFrameDecoder extends ByteToMessageDecoder
ByteBuf
s by the fixed number
of bytes. For example, if you received the following four fragmented packets:
+---+----+------+----+ | A | BC | DEFG | HI | +---+----+------+----+A
FixedLengthFrameDecoder
(3)
will decode them into the
following three packets with the fixed length:
+-----+-----+-----+ | ABC | DEF | GHI | +-----+-----+-----+
ByteToMessageDecoder.Cumulator
ChannelHandler.Sharable
COMPOSITE_CUMULATOR, MERGE_CUMULATOR
Constructor and Description |
---|
FixedLengthFrameDecoder(int frameLength)
Creates a new instance.
|
Modifier and Type | Method and Description |
---|---|
protected Object |
decode(ChannelHandlerContext ctx,
ByteBuf in)
Create a frame out of the
ByteBuf and return it. |
protected void |
decode(ChannelHandlerContext ctx,
ByteBuf in,
List<Object> out)
Decode the from one
ByteBuf to an other. |
actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggered
channelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught
ensureNotSharable, handlerAdded, isSharable
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
handlerAdded
public FixedLengthFrameDecoder(int frameLength)
frameLength
- the length of the frameprotected final void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception
ByteToMessageDecoder
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
.decode
in class ByteToMessageDecoder
ctx
- the ChannelHandlerContext
which this ByteToMessageDecoder
belongs toin
- the ByteBuf
from which to read dataout
- the List
to which decoded messages should be addedException
- is thrown if an error occursprotected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception
ByteBuf
and return it.ctx
- the ChannelHandlerContext
which this ByteToMessageDecoder
belongs toin
- the ByteBuf
from which to read dataByteBuf
which represent the frame or null
if no frame could
be created.Exception
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