Package org.drasyl.peer.connection.handler

Class RelayableMessageGuard

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelOutboundHandlerAdapter

org.drasyl.peer.connection.handler.SimpleChannelOutboundHandler<RelayableMessage>

org.drasyl.peer.connection.handler.RelayableMessageGuard

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelOutboundHandler

public class RelayableMessageGuard
extends SimpleChannelOutboundHandler<RelayableMessage>

This handler ensures that RelayableMessages do not infinitely circulate in the network. It increments the hop counter of each outgoing message. If the limit of hops is reached, the message is discarded. Otherwise the message can pass.

Nested Class Summary

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

io.netty.channel.ChannelHandler.Sharable

Field Summary

Fields

Modifier and Type	Field	Description
static String	HOP_COUNT_GUARD

Constructor Summary

Constructors

Constructor	Description
RelayableMessageGuard(short messageHopLimit)

Method Summary

Modifier and Type	Method	Description
protected void	channelWrite0(io.netty.channel.ChannelHandlerContext ctx, RelayableMessage msg, io.netty.channel.ChannelPromise promise)	Is called for each message of type SimpleChannelOutboundHandler on the outbound channel.

Methods inherited from class org.drasyl.peer.connection.handler.SimpleChannelOutboundHandler

acceptOutboundMessage, write

Methods inherited from class io.netty.channel.ChannelOutboundHandlerAdapter

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

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, exceptionCaught, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.netty.channel.ChannelHandler

exceptionCaught, handlerAdded, handlerRemoved

Field Detail

HOP_COUNT_GUARD

public static final String HOP_COUNT_GUARD

See Also:

Constant Field Values

Constructor Detail

RelayableMessageGuard

public RelayableMessageGuard(short messageHopLimit)

Method Detail

channelWrite0

protected void channelWrite0(io.netty.channel.ChannelHandlerContext ctx,
                             RelayableMessage msg,
                             io.netty.channel.ChannelPromise promise)

Description copied from class: SimpleChannelOutboundHandler

Is called for each message of type SimpleChannelOutboundHandler on the outbound channel.

Specified by:

channelWrite0 in class SimpleChannelOutboundHandler<RelayableMessage>

Parameters:

ctx - the ChannelHandlerContext which this SimpleChannelDuplexHandler belongs to

msg - the message to handle

promise - the corresponding promise