ChannelHandler which decodes bytes in a stream-like fashion from one Buffer to an other Message type. For example here is an implementation which reads all readable bytes from the input Buffer, creates a new Buffer and forward it to the next ChannelHandler in the ChannelPipeline.

    public class SquareDecoder extends ByteToMessageDecoder {
        @Override
        public void decode(ChannelHandlerContext ctx, Buffer in)
                throws Exception {
            ctx.fireChannelRead(in.readBytes(in.readableBytes()));
        }
    }

Frame detection

Generally frame detection should be handled earlier in the pipeline by adding a DelimiterBasedFrameDecoder, FixedLengthFrameDecoder, LengthFieldBasedFrameDecoder, or LineBasedFrameDecoder.

If a custom frame decoder is required, then one needs to be careful when implementing one with ByteToMessageDecoder. Ensure there are enough bytes in the buffer for a complete frame by checking Buffer#readableBytes(). If there are not enough bytes for a complete frame, return without modifying the reader index to allow more bytes to arrive.

To check for complete frames without modifying the reader index, use methods like Buffer#getInt(int). One MUST use the reader index when using methods like Buffer#getInt(int). For example calling in.getInt(0) is assuming the frame starts at the beginning of the buffer, which is not always the case. Use in.getInt(in.readerIndex()) instead.

Pitfalls

Be aware that sub-classes of ByteToMessageDecoder MUST NOT annotated with @Sharable.

Nested and Inner Type Summary

Modifier and Type	Class and Description
pack-priv static class	ByteToMessageDecoder.ByteToMessageDecoderContext
private static class	ByteToMessageDecoder.CompositeBufferCumulator
public static interface	ByteToMessageDecoder.Cumulator Cumulate `Buffer`s.
private static class	ByteToMessageDecoder.MergeCumulator

Field Summary

Modifier and Type	Field and Description
public static final ByteToMessageDecoder.Cumulator	COMPOSITE_CUMULATOR Cumulate `Buffer`s by add them to a `CompositeBuffer` and so do no memory copy whenever possible.
private ByteToMessageDecoder.ByteToMessageDecoderContext	context
private Buffer	cumulation
private final ByteToMessageDecoder.Cumulator	cumulator
private final int	discardAfterReads
private boolean	firedChannelRead This flag is used to determine if we need to call `ChannelOutboundInvoker#read(ReadBufferAllocator)` to consume more data when `ChannelOption#AUTO_READ` is `false`.
private boolean	first
public static final ByteToMessageDecoder.Cumulator	MERGE_CUMULATOR Cumulate `Buffer`s by merge them into one `Buffer`'s, using memory copies.
private int	numReads
private boolean	singleDecode

Constructor Summary

Access	Constructor and Description
protected	ByteToMessageDecoder()
protected	ByteToMessageDecoder(ByteToMessageDecoder.Cumulator cumulator)

Method Summary

Modifier and Type	Method and Description
protected int	actualReadableBytes() Returns the actual number of readable bytes in the internal cumulative buffer of this decoder.
pack-priv void	callDecode(ByteToMessageDecoder.ByteToMessageDecoderContext the `ChannelHandlerContext` which this `ByteToMessageDecoder` belongs to ctx, Buffer the `Buffer` from which to read data in) Called once data should be decoded from the given `Buffer`.
public void	channelInactive(ChannelHandlerContext ctx) Overrides default io.netty5.channel.ChannelHandler.channelInactive. The `Channel` of the `ChannelHandlerContext` was registered is now inactive and reached its end of lifetime.
private void	channelInputClosed(ByteToMessageDecoder.ByteToMessageDecoderContext ctx, boolean callChannelInactive)
pack-priv void	channelInputClosed(ByteToMessageDecoder.ByteToMessageDecoderContext ctx) Called when the input of the channel was closed which may be because it changed to inactive or because of shutdown.
public void	channelRead(ChannelHandlerContext ctx, Object msg) Overrides default io.netty5.channel.ChannelHandler.channelRead. Invoked when the current `Channel` has read a message from the peer.
public void	channelReadComplete(ChannelHandlerContext ctx) Overrides default io.netty5.channel.ChannelHandler.channelReadComplete. Invoked when the last message read by the current read operation has been consumed by `channelRead(ChannelHandlerContext, Object)`.
public void	channelShutdown(ChannelHandlerContext the `ChannelHandlerContext` for which we notify about the completed shutdown. ctx, ChannelShutdownDirection the `ChannelShutdownDirection` of the completed shutdown. direction) Overrides default io.netty5.channel.ChannelHandler.channelShutdown. The `Channel` of the `ChannelHandlerContext` was shutdown in one direction.
protected abstract void	decode(ChannelHandlerContext the `ChannelHandlerContext` which this `ByteToMessageDecoder` belongs to ctx, Buffer the `Buffer` from which to read data in) Decode the from one `Buffer` to another.
protected void	decodeLast(ChannelHandlerContext ctx, Buffer in) Is called one last time when the `ChannelHandlerContext` goes in-active.
pack-priv final void	decodeRemovalReentryProtection(ChannelHandlerContext the `ChannelHandlerContext` which this `ByteToMessageDecoder` belongs to ctx, Buffer the `Buffer` from which to read data in) Decode the from one `Buffer` to an other.
protected final void	discardSomeReadBytes()
public final void	handlerAdded(ChannelHandlerContext ctx) Overrides default io.netty5.channel.ChannelHandler.handlerAdded. Gets called after the `ChannelHandler` was added to the actual context and it's ready to handle events.
protected void	handlerAdded0(ChannelHandlerContext ctx)
public final void	handlerRemoved(ChannelHandlerContext ctx) Overrides default io.netty5.channel.ChannelHandler.handlerRemoved. Gets called after the `ChannelHandler` was removed from the actual context and it doesn't handle events anymore.
protected void	handlerRemoved0(ChannelHandlerContext ctx) Gets called after the `ByteToMessageDecoder` was removed from the actual context and it doesn't handle events anymore.
protected Buffer	Returns: Internal `Buffer` if exists, else `null`. internalBuffer() Returns the internal cumulative buffer of this decoder, if exists, else `null`.
public final boolean	isSharable() Overrides default io.netty5.channel.ChannelHandler.isSharable. Returns `true` if this handler is sharable and thus can be added to more than one `ChannelPipeline`.
public boolean	isSingleDecode() If `true` then only one message is decoded on each `channelRead(ChannelHandlerContext, Object)` call.
public void	setSingleDecode(boolean singleDecode) If set then only one message is decoded on each `channelRead(ChannelHandlerContext, Object)` call.

Field Detail

COMPOSITE_CUMULATOR	back to summary
public static final ByteToMessageDecoder.Cumulator COMPOSITE_CUMULATOR Cumulate `Buffer`s by add them to a `CompositeBuffer` and so do no memory copy whenever possible. Be aware that `CompositeBuffer` use a more complex indexing implementation so depending on your use-case and the decoder implementation this may be slower than just use the `MERGE_CUMULATOR`.

context	back to summary
private ByteToMessageDecoder.ByteToMessageDecoderContext context

cumulation	back to summary
private Buffer cumulation

cumulator	back to summary
private final ByteToMessageDecoder.Cumulator cumulator

discardAfterReads	back to summary
private final int discardAfterReads

firedChannelRead	back to summary
private boolean firedChannelRead This flag is used to determine if we need to call `ChannelOutboundInvoker#read(ReadBufferAllocator)` to consume more data when `ChannelOption#AUTO_READ` is `false`.

first	back to summary
private boolean first

MERGE_CUMULATOR	back to summary
public static final ByteToMessageDecoder.Cumulator MERGE_CUMULATOR Cumulate `Buffer`s by merge them into one `Buffer`'s, using memory copies.

numReads	back to summary
private int numReads

singleDecode	back to summary
private boolean singleDecode

Constructor Detail

ByteToMessageDecoder	back to summary
protected ByteToMessageDecoder()

ByteToMessageDecoder	back to summary
protected ByteToMessageDecoder(ByteToMessageDecoder.Cumulator cumulator)

Method Detail

actualReadableBytes	back to summary
protected int actualReadableBytes() Returns the actual number of readable bytes in the internal cumulative buffer of this decoder. You usually do not need to rely on this value to write a decoder. Use it only when you must use it at your own risk. This method is a shortcut to `internalBuffer().readableBytes()`.

callDecode back to summary

callDecode	back to summary
pack-priv void callDecode(ByteToMessageDecoder.ByteToMessageDecoderContext ctx, Buffer in) Called once data should be decoded from the given `Buffer`. This method will call `decode(ChannelHandlerContext, Buffer)` as long as decoding should take place. Parameters ctx:ByteToMessageDecoder.ByteToMessageDecoderContext the `ChannelHandlerContext` which this `ByteToMessageDecoder` belongs to in:Buffer the `Buffer` from which to read data

pack-priv void callDecode(ByteToMessageDecoder.ByteToMessageDecoderContext ctx, Buffer in)

Called once data should be decoded from the given Buffer. This method will call decode(ChannelHandlerContext, Buffer) as long as decoding should take place.

Parameters

ctx:ByteToMessageDecoder.ByteToMessageDecoderContext: the ChannelHandlerContext which this ByteToMessageDecoder belongs to
in:Buffer: the Buffer from which to read data

channelInactive back to summary

channelInactive	back to summary
public void channelInactive(ChannelHandlerContext ctx) throws Exception Overrides default io.netty5.channel.ChannelHandler.channelInactive. Doc from io.netty5.channel.ChannelHandler.channelInactive. The `Channel` of the `ChannelHandlerContext` was registered is now inactive and reached its end of lifetime. Annotations @Override

public void channelInactive(ChannelHandlerContext ctx) throws Exception

Overrides default io.netty5.channel.ChannelHandler.channelInactive.

Doc from io.netty5.channel.ChannelHandler.channelInactive.

The Channel of the ChannelHandlerContext was registered is now inactive and reached its end of lifetime.

Annotations

@Override

channelInputClosed	back to summary
private void channelInputClosed(ByteToMessageDecoder.ByteToMessageDecoderContext ctx, boolean callChannelInactive)

channelInputClosed	back to summary
pack-priv void channelInputClosed(ByteToMessageDecoder.ByteToMessageDecoderContext ctx) throws Exception Called when the input of the channel was closed which may be because it changed to inactive or because of shutdown.

channelRead back to summary

channelRead	back to summary
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception Overrides default io.netty5.channel.ChannelHandler.channelRead. Doc from io.netty5.channel.ChannelHandler.channelRead. Invoked when the current `Channel` has read a message from the peer. Annotations @Override

public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception

Overrides default io.netty5.channel.ChannelHandler.channelRead.

Doc from io.netty5.channel.ChannelHandler.channelRead.

Invoked when the current Channel has read a message from the peer.

Annotations

@Override

channelReadComplete back to summary

channelReadComplete	back to summary
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception Overrides default io.netty5.channel.ChannelHandler.channelReadComplete. Doc from io.netty5.channel.ChannelHandler.channelReadComplete. Invoked when the last message read by the current read operation has been consumed by `channelRead(ChannelHandlerContext, Object)`. If `ChannelOption#AUTO_READ` is off, no further attempt to read an inbound data from the current `Channel` will be made until `ChannelOutboundInvoker#read(ReadBufferAllocator)` is called. Annotations @Override

public void channelReadComplete(ChannelHandlerContext ctx) throws Exception

Overrides default io.netty5.channel.ChannelHandler.channelReadComplete.

Doc from io.netty5.channel.ChannelHandler.channelReadComplete.

Invoked when the last message read by the current read operation has been consumed by channelRead(ChannelHandlerContext, Object). If ChannelOption#AUTO_READ is off, no further attempt to read an inbound data from the current Channel will be made until ChannelOutboundInvoker#read(ReadBufferAllocator) is called.

Annotations

@Override

channelShutdown back to summary

channelShutdown	back to summary
public void channelShutdown(ChannelHandlerContext ctx, ChannelShutdownDirection direction) throws Exception Overrides default io.netty5.channel.ChannelHandler.channelShutdown. Doc from io.netty5.channel.ChannelHandler.channelShutdown. The `Channel` of the `ChannelHandlerContext` was shutdown in one direction. This might either be because the remote peer did cause a shutdown of one direction or the shutdown was requested explicit by us and was executed. Parameters ctx:ChannelHandlerContext the `ChannelHandlerContext` for which we notify about the completed shutdown. direction:ChannelShutdownDirection the `ChannelShutdownDirection` of the completed shutdown. Annotations @Override

public void channelShutdown(ChannelHandlerContext ctx, ChannelShutdownDirection direction) throws Exception

Overrides default io.netty5.channel.ChannelHandler.channelShutdown.

Doc from io.netty5.channel.ChannelHandler.channelShutdown.

The Channel of the ChannelHandlerContext was shutdown in one direction. This might either be because the remote peer did cause a shutdown of one direction or the shutdown was requested explicit by us and was executed.

Parameters

ctx:ChannelHandlerContext: the ChannelHandlerContext for which we notify about the completed shutdown.
direction:ChannelShutdownDirection: the ChannelShutdownDirection of the completed shutdown.

Annotations

@Override

decode back to summary

decode	back to summary
protected abstract void decode(ChannelHandlerContext ctx, Buffer in) throws Exception Decode the from one `Buffer` to another. This method will be called till either the input `Buffer` has nothing to read when return from this method or till nothing was read from the input `Buffer`. Parameters ctx:ChannelHandlerContext the `ChannelHandlerContext` which this `ByteToMessageDecoder` belongs to in:Buffer the `Buffer` from which to read data Exceptions Exception: is thrown if an error occurs

protected abstract void decode(ChannelHandlerContext ctx, Buffer in) throws Exception

Decode the from one Buffer to another. This method will be called till either the input Buffer has nothing to read when return from this method or till nothing was read from the input Buffer.

Parameters

ctx:ChannelHandlerContext: the ChannelHandlerContext which this ByteToMessageDecoder belongs to
in:Buffer: the Buffer from which to read data

Exceptions

Exception:: is thrown if an error occurs

decodeLast	back to summary
protected void decodeLast(ChannelHandlerContext ctx, Buffer in) throws Exception Is called one last time when the `ChannelHandlerContext` goes in-active. Which means the `channelInactive(ChannelHandlerContext)` was triggered. By default this will just call `decode(ChannelHandlerContext, Buffer)` but sub-classes may override this for some special cleanup operation.

decodeRemovalReentryProtection back to summary

decodeRemovalReentryProtection	back to summary
pack-priv final void decodeRemovalReentryProtection(ChannelHandlerContext ctx, Buffer in) throws Exception Decode the from one `Buffer` to an other. This method will be called till either the input `Buffer` has nothing to read when return from this method or till nothing was read from the input `Buffer`. Parameters ctx:ChannelHandlerContext the `ChannelHandlerContext` which this `ByteToMessageDecoder` belongs to in:Buffer the `Buffer` from which to read data Exceptions Exception: is thrown if an error occurs

pack-priv final void decodeRemovalReentryProtection(ChannelHandlerContext ctx, Buffer in) throws Exception

Decode the from one Buffer to an other. This method will be called till either the input Buffer has nothing to read when return from this method or till nothing was read from the input Buffer.

Parameters

ctx:ChannelHandlerContext: the ChannelHandlerContext which this ByteToMessageDecoder belongs to
in:Buffer: the Buffer from which to read data

Exceptions

Exception:: is thrown if an error occurs

discardSomeReadBytes	back to summary
protected final void discardSomeReadBytes()

handlerAdded back to summary

handlerAdded	back to summary
public final void handlerAdded(ChannelHandlerContext ctx) throws Exception Overrides default io.netty5.channel.ChannelHandler.handlerAdded. Doc from io.netty5.channel.ChannelHandler.handlerAdded. Gets called after the `ChannelHandler` was added to the actual context and it's ready to handle events. Annotations @Override

public final void handlerAdded(ChannelHandlerContext ctx) throws Exception

Overrides default io.netty5.channel.ChannelHandler.handlerAdded.

Doc from io.netty5.channel.ChannelHandler.handlerAdded.

Gets called after the ChannelHandler was added to the actual context and it's ready to handle events.

Annotations

@Override

handlerAdded0	back to summary
protected void handlerAdded0(ChannelHandlerContext ctx) throws Exception

handlerRemoved back to summary

handlerRemoved	back to summary
public final void handlerRemoved(ChannelHandlerContext ctx) throws Exception Overrides default io.netty5.channel.ChannelHandler.handlerRemoved. Doc from io.netty5.channel.ChannelHandler.handlerRemoved. Gets called after the `ChannelHandler` was removed from the actual context and it doesn't handle events anymore. Annotations @Override

public final void handlerRemoved(ChannelHandlerContext ctx) throws Exception

Overrides default io.netty5.channel.ChannelHandler.handlerRemoved.

Doc from io.netty5.channel.ChannelHandler.handlerRemoved.

Gets called after the ChannelHandler was removed from the actual context and it doesn't handle events anymore.

Annotations

@Override

handlerRemoved0	back to summary
protected void handlerRemoved0(ChannelHandlerContext ctx) throws Exception Gets called after the `ByteToMessageDecoder` was removed from the actual context and it doesn't handle events anymore.

internalBuffer back to summary

internalBuffer	back to summary
protected Buffer internalBuffer() Returns the internal cumulative buffer of this decoder, if exists, else `null`. You usually do not need to access the internal buffer directly to write a decoder. Use it only when you must use it at your own risk. Returns:Buffer Internal `Buffer` if exists, else `null`.

protected Buffer internalBuffer()

Returns the internal cumulative buffer of this decoder, if exists, else null. You usually do not need to access the internal buffer directly to write a decoder. Use it only when you must use it at your own risk.

Returns:Buffer: Internal Buffer if exists, else null.

isSharable back to summary

isSharable	back to summary
public final boolean isSharable() Overrides default io.netty5.channel.ChannelHandler.isSharable. Doc from io.netty5.channel.ChannelHandler.isSharable. Returns `true` if this handler is sharable and thus can be added to more than one `ChannelPipeline`. By default, this method returns `false`. If this method returns `false`, you have to create a new handler instance every time you add it to a pipeline because it has unshared state such as member variables. Annotations @Override

public final boolean isSharable()

Overrides default io.netty5.channel.ChannelHandler.isSharable.

Doc from io.netty5.channel.ChannelHandler.isSharable.

Returns true if this handler is sharable and thus can be added to more than one ChannelPipeline. By default, this method returns false. If this method returns false, you have to create a new handler instance every time you add it to a pipeline because it has unshared state such as member variables.

Annotations

@Override

isSingleDecode	back to summary
public boolean isSingleDecode() If `true` then only one message is decoded on each `channelRead(ChannelHandlerContext, Object)` call. Default is `false` as this has performance impacts.

setSingleDecode	back to summary
public void setSingleDecode(boolean singleDecode) If set then only one message is decoded on each `channelRead(ChannelHandlerContext, Object)` call. This may be useful if you need to do some protocol upgrade and want to make sure nothing is mixed up. Default is `false` as this has performance impacts.

io.netty5.handler.codec back to summary

pack-priv final Class ByteToMessageDecoder.ByteToMessageDecoderContext

Class Inheritance

extends DelegatingChannelHandlerContext

java.lang.Object
io.netty5.channel.internal.DelegatingChannelHandlerContext
io.netty5.handler.codec.ByteToMessageDecoder.ByteToMessageDecoderContext

Field Summary

Modifier and Type	Field and Description
private int	fireChannelReadCalled

Constructor Summary

Access	Constructor and Description
private	ByteToMessageDecoderContext(ChannelHandlerContext ctx)

Method Summary

Modifier and Type	Method and Description
public ChannelHandlerContext	fireChannelRead(Object msg) Overrides io.netty5.channel.internal.DelegatingChannelHandlerContext.fireChannelRead. Implements io.netty5.channel.ChannelHandlerContext.fireChannelRead. A `Channel` received a message.
pack-priv int	fireChannelReadCallCount()
pack-priv void	reset()

Field Detail

fireChannelReadCalled	back to summary
private int fireChannelReadCalled

Constructor Detail

ByteToMessageDecoderContext	back to summary
private ByteToMessageDecoderContext(ChannelHandlerContext ctx)

Method Detail

fireChannelRead back to summary

fireChannelRead	back to summary
public ChannelHandlerContext fireChannelRead(Object msg) Overrides io.netty5.channel.internal.DelegatingChannelHandlerContext.fireChannelRead. Implements io.netty5.channel.ChannelHandlerContext.fireChannelRead. Doc from io.netty5.channel.ChannelInboundInvoker.fireChannelRead. A `Channel` received a message. This will result in having the `ChannelHandler#channelRead(ChannelHandlerContext, Object)` method called of the next `ChannelHandler` contained in the `ChannelPipeline` of the `Channel`. Annotations @Override

public ChannelHandlerContext fireChannelRead(Object msg)

Overrides io.netty5.channel.internal.DelegatingChannelHandlerContext.fireChannelRead.

Implements io.netty5.channel.ChannelHandlerContext.fireChannelRead.

Doc from io.netty5.channel.ChannelInboundInvoker.fireChannelRead.

A Channel received a message. This will result in having the ChannelHandler#channelRead(ChannelHandlerContext, Object) method called of the next ChannelHandler contained in the ChannelPipeline of the Channel.

Annotations

@Override

fireChannelReadCallCount	back to summary
pack-priv int fireChannelReadCallCount()

reset	back to summary
pack-priv void reset()

io.netty5.handler.codec back to summary

private final Class ByteToMessageDecoder.CompositeBufferCumulator

Class Inheritance

extends Object
implements Cumulator

java.lang.Object
io.netty5.handler.codec.ByteToMessageDecoder.CompositeBufferCumulator

All Implemented Interfaces

io.netty5.handler.codec.ByteToMessageDecoder.Cumulator

Constructor Summary

Access	Constructor and Description
private	CompositeBufferCumulator()

Method Summary

Modifier and Type	Method and Description
public Buffer	cumulate(BufferAllocator alloc, Buffer cumulation, Buffer in) Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.cumulate. Cumulate the given `Buffer`s and return the `Buffer` that holds the cumulated bytes.
public Buffer	discardSomeReadBytes(Buffer The buffer we wish to trim already processed bytes from. cumulation) Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.discardSomeReadBytes. Consume the given buffer and return a new buffer with the same readable data, but where any data before the read offset may have been removed.
private static Send<Buffer>	prepareInForCompose(Buffer in)
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of the object.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll wait wait wait

Constructor Detail

CompositeBufferCumulator	back to summary
private CompositeBufferCumulator()

Method Detail

cumulate back to summary

cumulate	back to summary
public Buffer cumulate(BufferAllocator alloc, Buffer cumulation, Buffer in) Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.cumulate. Doc from io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.cumulate. Cumulate the given `Buffer`s and return the `Buffer` that holds the cumulated bytes. The implementation is responsible to correctly handle the life-cycle of the given `Buffer`s and so call `Buffer#close()` if a `Buffer` is fully consumed. Annotations @Override

public Buffer cumulate(BufferAllocator alloc, Buffer cumulation, Buffer in)

Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.cumulate.

Doc from io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.cumulate.

Cumulate the given Buffers and return the Buffer that holds the cumulated bytes. The implementation is responsible to correctly handle the life-cycle of the given Buffers and so call Buffer#close() if a Buffer is fully consumed.

Annotations

@Override

discardSomeReadBytes	back to summary
public Buffer discardSomeReadBytes(Buffer cumulation) Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.discardSomeReadBytes. Doc from io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.discardSomeReadBytes. Consume the given buffer and return a new buffer with the same readable data, but where any data before the read offset may have been removed. The returned buffer may be the same buffer instance as the buffer passed in. Parameters cumulation:Buffer The buffer we wish to trim already processed bytes from. Returns:Buffer A buffer where the bytes before the reader-offset have been removed. Annotations @Override

discardSomeReadBytes

back to summary

public Buffer discardSomeReadBytes(Buffer cumulation)

Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.discardSomeReadBytes.

Doc from io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.discardSomeReadBytes.

Consume the given buffer and return a new buffer with the same readable data, but where any data before the read offset may have been removed. The returned buffer may be the same buffer instance as the buffer passed in.

Parameters

cumulation:Buffer: The buffer we wish to trim already processed bytes from.

Returns:Buffer

A buffer where the bytes before the reader-offset have been removed.

Annotations

@Override

prepareInForCompose	back to summary
private static Send<Buffer> prepareInForCompose(Buffer in)

toString

back to summary

public String toString()

Overrides java.lang.Object.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object.

Returns:String

a string representation of the object

Annotations

@Override

io.netty5.handler.codec back to summary

public Interface ByteToMessageDecoder.Cumulator

Known Direct Implementers: io.netty5.handler.codec.ByteToMessageDecoder.CompositeBufferCumulator, io.netty5.handler.codec.ByteToMessageDecoder.MergeCumulator

Cumulate Buffers.

Method Summary

Modifier and Type	Method and Description
public Buffer	cumulate(BufferAllocator alloc, Buffer cumulation, Buffer in) Cumulate the given `Buffer`s and return the `Buffer` that holds the cumulated bytes.
public Buffer	Returns: A buffer where the bytes before the reader-offset have been removed. discardSomeReadBytes(Buffer The buffer we wish to trim already processed bytes from. cumulation) Consume the given buffer and return a new buffer with the same readable data, but where any data before the read offset may have been removed.

Method Detail

cumulate	back to summary
public Buffer cumulate(BufferAllocator alloc, Buffer cumulation, Buffer in) Cumulate the given `Buffer`s and return the `Buffer` that holds the cumulated bytes. The implementation is responsible to correctly handle the life-cycle of the given `Buffer`s and so call `Buffer#close()` if a `Buffer` is fully consumed.

discardSomeReadBytes

back to summary

public Buffer discardSomeReadBytes(Buffer cumulation)

Parameters

cumulation:Buffer: The buffer we wish to trim already processed bytes from.

Returns:Buffer

A buffer where the bytes before the reader-offset have been removed.

io.netty5.handler.codec back to summary

private final Class ByteToMessageDecoder.MergeCumulator

Class Inheritance

extends Object
implements Cumulator

java.lang.Object
io.netty5.handler.codec.ByteToMessageDecoder.MergeCumulator

All Implemented Interfaces

io.netty5.handler.codec.ByteToMessageDecoder.Cumulator

Constructor Summary

Access	Constructor and Description
private	MergeCumulator()

Method Summary

Modifier and Type	Method and Description
public Buffer	cumulate(BufferAllocator alloc, Buffer cumulation, Buffer in) Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.cumulate. Cumulate the given `Buffer`s and return the `Buffer` that holds the cumulated bytes.
public Buffer	discardSomeReadBytes(Buffer The buffer we wish to trim already processed bytes from. cumulation) Implements io.netty5.handler.codec.ByteToMessageDecoder.Cumulator.discardSomeReadBytes. Consume the given buffer and return a new buffer with the same readable data, but where any data before the read offset may have been removed.
private static Buffer	expandCumulationAndWrite(BufferAllocator alloc, Buffer oldCumulation, Buffer in)
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of the object.