Class MqttEncoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelOutboundHandlerAdapter

io.netty.handler.codec.MessageToMessageEncoder<MqttMessage>

io.netty.handler.codec.mqtt.MqttEncoder

All Implemented Interfaces:

ChannelHandler, ChannelOutboundHandler

@Sharable
public final class MqttEncoder
extends MessageToMessageEncoder<MqttMessage>

Encodes Mqtt messages into bytes following the protocol specification v3.1 as described here MQTTV3.1 or v5.0 as described here MQTTv5.0 - depending on the version specified in the first CONNECT message that goes through the channel.

Nested Class Summary

Nested classes/interfaces inherited from interface ChannelHandler

ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field	Description
static final MqttEncoder	INSTANCE

Method Summary

Modifier and Type	Method	Description
protected void	encode(ChannelHandlerContext ctx, MqttMessage msg, List<Object> out)	Encode from one message to an other.

Methods inherited from class MessageToMessageEncoder

acceptOutboundMessage, write

Methods inherited from class ChannelOutboundHandlerAdapter

bind, close, connect, deregister, disconnect, flush, read

Methods inherited from class ChannelHandlerAdapter

ensureNotSharable, exceptionCaught, handlerAdded, handlerRemoved, isSharable

Methods inherited from class Object

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

Methods inherited from interface ChannelHandler

exceptionCaught, handlerAdded, handlerRemoved

Field Details

INSTANCE

public static final MqttEncoder INSTANCE

Method Details

encode

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

Description copied from class: MessageToMessageEncoder

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

Specified by:

encode in class MessageToMessageEncoder<MqttMessage>

Parameters:

ctx - the ChannelHandlerContext which this MessageToMessageEncoder belongs to

msg - the message to encode to an other one

out - the List into which the encoded msg should be added needs to do some kind of aggregation

Throws:

Exception - is thrown if an error occurs