Module io.netty5.codec

Package io.netty5.handler.codec.string

Class LineEncoder

java.lang.Object

io.netty5.channel.ChannelHandlerAdapter

io.netty5.handler.codec.MessageToMessageEncoder<CharSequence>

io.netty5.handler.codec.string.LineEncoder

All Implemented Interfaces:

ChannelHandler

public class LineEncoder
extends MessageToMessageEncoder<CharSequence>

Apply a line separator to the requested String and encode it into a Buffer. A typical setup for a text-based line protocol in a TCP/IP socket would be:

 ChannelPipeline pipeline = ...;

 // Decoders
 pipeline.addLast("frameDecoder", new LineBasedFrameDecoder(80));
 pipeline.addLast("stringDecoder", new StringDecoder(CharsetUtil.UTF_8));

 // Encoder
 pipeline.addLast("lineEncoder", new LineEncoder(LineSeparator.UNIX, CharsetUtil.UTF_8));
 

and then you can use a String instead of a Buffer as a message:

 void channelRead(ChannelHandlerContext ctx, String msg) {
     ch.write("Did you say '" + msg + "'?");
 }
 

Constructor Summary

Constructors

Constructor	Description
LineEncoder()	Creates a new instance with the current system line separator and UTF-8 charset encoding.
LineEncoder(LineSeparator lineSeparator)	Creates a new instance with the specified line separator and UTF-8 charset encoding.
LineEncoder(LineSeparator lineSeparator, Charset charset)	Creates a new instance with the specified line separator and character set.
LineEncoder(Charset charset)	Creates a new instance with the specified character set.

Method Summary

Modifier and Type	Method	Description
protected void	encode(ChannelHandlerContext ctx, CharSequence msg, List<Object> out)	Encode from one message to another.
boolean	isSharable()	Returns true if this handler is sharable and thus can be added to more than one ChannelPipeline.

Methods inherited from class io.netty5.handler.codec.MessageToMessageEncoder

acceptOutboundMessage, encodeAndClose, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty5.channel.ChannelHandler

bind, channelActive, channelExceptionCaught, channelInactive, channelInboundEvent, channelRead, channelReadComplete, channelRegistered, channelShutdown, channelUnregistered, channelWritabilityChanged, close, connect, deregister, disconnect, flush, handlerAdded, handlerRemoved, pendingOutboundBytes, read, register, sendOutboundEvent, shutdown

Constructor Detail

LineEncoder

public LineEncoder()

Creates a new instance with the current system line separator and UTF-8 charset encoding.

LineEncoder

public LineEncoder(LineSeparator lineSeparator)

Creates a new instance with the specified line separator and UTF-8 charset encoding.

LineEncoder

public LineEncoder(Charset charset)

Creates a new instance with the specified character set.

LineEncoder

public LineEncoder(LineSeparator lineSeparator,
                   Charset charset)

Creates a new instance with the specified line separator and character set.

Method Detail

isSharable

public boolean isSharable()

Description copied from interface: ChannelHandler

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.

encode

protected void encode(ChannelHandlerContext ctx,
                      CharSequence msg,
                      List<Object> out)
               throws Exception

Description copied from class: MessageToMessageEncoder

Encode from one message to another. This method will be called for each written message that can be handled by this encoder.

The message will be disposed of after this call.

Subclasses that wish to sometimes pass messages through, should instead override the MessageToMessageEncoder.encodeAndClose(ChannelHandlerContext, Object, List) method.

Overrides:

encode in class MessageToMessageEncoder<CharSequence>

Parameters:

ctx - the ChannelHandlerContext which this MessageToMessageEncoder belongs to.

msg - the message to encode to another one.

out - the List into which produced output messages should be added.

Throws:

Exception - is thrown if an error occurs.