|Constructor and Description|
Creates a new decoder whose maximum object size is
Creates a new decoder with the specified maximum object size.
|Modifier and Type||Method and Description|
Decodes the received packets so far into a frame.
Extract the sub-region of the specified buffer.
actualReadableBytes, afterAdd, afterRemove, appendToCumulation, beforeAdd, beforeRemove, channelClosed, channelDisconnected, cleanup, decodeLast, exceptionCaught, getMaxCumulationBufferCapacity, getMaxCumulationBufferComponents, internalBuffer, isUnfold, messageReceived, newCumulationBuffer, replace, setMaxCumulationBufferCapacity, setMaxCumulationBufferComponents, setUnfold, unfoldAndFireMessageReceived, updateCumulation
channelBound, channelConnected, channelInterestChanged, channelOpen, channelUnbound, childChannelClosed, childChannelOpen, handleUpstream, writeComplete
public MarshallingDecoder(UnmarshallerProvider provider)
1048576bytes. If the size of the received object is greater than
StreamCorruptedExceptionwill be raised.
public MarshallingDecoder(UnmarshallerProvider provider, int maxObjectSize)
maxObjectSize- the maximum byte length of the serialized object. if the length of the received object is greater than this value,
TooLongFrameExceptionwill be raised.
protected Object decode(ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception
ctx- the context of this handler
channel- the current channel
buffer- the cumulative buffer of received packets so far. Note that the buffer might be empty, which means you should not make an assumption that the buffer contains at least one byte in your decoder implementation.
nullif there's not enough data in the buffer to decode a frame.
protected ChannelBuffer extractFrame(ChannelBuffer buffer, int index, int length)
LengthFieldBasedFrameDecoder.decode(ChannelHandlerContext, Channel, ChannelBuffer)for each frame. The default implementation returns a copy of the sub-region. For example, you could override this method to use an alternative
If you are sure that the frame and its content are not accessed after
LengthFieldBasedFrameDecoder.decode(ChannelHandlerContext, Channel, ChannelBuffer)
call returns, you can even avoid memory copy by returning the sliced
sub-region (i.e. return buffer.slice(index, length)).
It's often useful when you convert the extracted frame into an object.
Refer to the source code of
ObjectDecoder to see how this method
is overridden to avoid memory copy.
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