Package org.drasyl.peer.connection.handler

Class AbstractThreeWayHandshakeClientHandler<R extends RequestMessage,O extends ResponseMessage<?>>

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.channel.SimpleChannelInboundHandler<I>

org.drasyl.peer.connection.handler.SimpleChannelDuplexHandler<Message,Message>

org.drasyl.peer.connection.handler.AbstractThreeWayHandshakeClientHandler<R,O>

All Implemented Interfaces:

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

Direct Known Subclasses:

ClientConnectionHandler

public abstract class AbstractThreeWayHandshakeClientHandler<R extends RequestMessage,O extends ResponseMessage<?>>
extends SimpleChannelDuplexHandler<Message,Message>

This handler performs the client-side part of a three-way handshake to create a session. It automatically requests the server for a new session. The server must confirm this request and then offers the client a session. Then the client has to confirm the offered session again.

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
protected CompletableFuture<Void>	handshakeFuture
protected Messenger	messenger
protected Duration	timeout
protected io.netty.util.concurrent.ScheduledFuture<?>	timeoutFuture

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractThreeWayHandshakeClientHandler(Duration timeout, Messenger messenger, CompletableFuture<Void> handshakeFuture, io.netty.util.concurrent.ScheduledFuture<?> timeoutFuture, R requestMessage)
protected	AbstractThreeWayHandshakeClientHandler(Duration timeout, Messenger messenger, R requestMessage)

Method Summary

Modifier and Type	Method	Description
void	channelActive(io.netty.channel.ChannelHandlerContext ctx)
void	channelRead0(io.netty.channel.ChannelHandlerContext ctx, Message msg)	Is called for each message of type SimpleChannelDuplexHandler on inbound channel.
protected void	channelWrite0(io.netty.channel.ChannelHandlerContext ctx, Message msg, io.netty.channel.ChannelPromise promise)	Is called for each message of type SimpleChannelDuplexHandler on the outbound channel.
void	close(io.netty.channel.ChannelHandlerContext ctx, io.netty.channel.ChannelPromise promise)
protected void	confirmSession(io.netty.channel.ChannelHandlerContext ctx, O offerMessage)
protected abstract void	createConnection(io.netty.channel.ChannelHandlerContext ctx, O offerMessage)
protected void	doHandshake(io.netty.channel.ChannelHandlerContext ctx, Message message)
void	exceptionCaught(io.netty.channel.ChannelHandlerContext ctx, Throwable cause)
protected abstract org.slf4j.Logger	getLogger()
void	handlerAdded(io.netty.channel.ChannelHandlerContext ctx)
protected void	processMessageAfterHandshake(io.netty.channel.ChannelHandlerContext ctx, Message message)
protected void	processUnexpectedMessageDuringHandshake(io.netty.channel.ChannelHandlerContext ctx, Message message)
protected void	rejectSession(io.netty.channel.ChannelHandlerContext ctx, ConnectionExceptionMessage.Error error)
protected void	requestSession(io.netty.channel.ChannelHandlerContext ctx)
protected void	startTimeoutGuard(io.netty.channel.ChannelHandlerContext ctx)
protected abstract ConnectionExceptionMessage.Error	validateSessionOffer(O offerMessage)	This method validates the session offered by the server and must return an ConnectionExceptionMessage.Error in case of error.

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

acceptOutboundMessage, bind, connect, deregister, disconnect, flush, read, write

Methods inherited from class io.netty.channel.SimpleChannelInboundHandler

acceptInboundMessage, channelRead

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelInactive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, userEventTriggered

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, 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

handlerRemoved

Field Detail

timeout

protected final Duration timeout

handshakeFuture

protected final CompletableFuture<Void> handshakeFuture

messenger

protected final Messenger messenger

timeoutFuture

protected io.netty.util.concurrent.ScheduledFuture<?> timeoutFuture

Constructor Detail

AbstractThreeWayHandshakeClientHandler

protected AbstractThreeWayHandshakeClientHandler(Duration timeout,
                                                 Messenger messenger,
                                                 R requestMessage)

AbstractThreeWayHandshakeClientHandler

protected AbstractThreeWayHandshakeClientHandler(Duration timeout,
                                                 Messenger messenger,
                                                 CompletableFuture<Void> handshakeFuture,
                                                 io.netty.util.concurrent.ScheduledFuture<?> timeoutFuture,
                                                 R requestMessage)

Method Detail

doHandshake

protected void doHandshake(io.netty.channel.ChannelHandlerContext ctx,
                           Message message)

handlerAdded

public void handlerAdded(io.netty.channel.ChannelHandlerContext ctx)
                  throws Exception

Specified by:

handlerAdded in interface io.netty.channel.ChannelHandler

Overrides:

handlerAdded in class io.netty.channel.ChannelHandlerAdapter

Throws:

Exception

requestSession

protected void requestSession(io.netty.channel.ChannelHandlerContext ctx)

validateSessionOffer

protected abstract ConnectionExceptionMessage.Error validateSessionOffer(O offerMessage)

This method validates the session offered by the server and must return an ConnectionExceptionMessage.Error in case of error. Otherwise null must be returned.

Parameters:

offerMessage -

Returns:

confirmSession

protected void confirmSession(io.netty.channel.ChannelHandlerContext ctx,
                              O offerMessage)

createConnection

protected abstract void createConnection(io.netty.channel.ChannelHandlerContext ctx,
                                         O offerMessage)

processUnexpectedMessageDuringHandshake

protected void processUnexpectedMessageDuringHandshake(io.netty.channel.ChannelHandlerContext ctx,
                                                       Message message)

getLogger

protected abstract org.slf4j.Logger getLogger()

channelRead0

public void channelRead0(io.netty.channel.ChannelHandlerContext ctx,
                         Message msg)

Description copied from class: SimpleChannelDuplexHandler

Is called for each message of type SimpleChannelDuplexHandler on inbound channel.

Specified by:

channelRead0 in class SimpleChannelDuplexHandler<Message,Message>

Parameters:

ctx - the ChannelHandlerContext which this SimpleChannelDuplexHandler belongs to

msg - the message to handle

close

public void close(io.netty.channel.ChannelHandlerContext ctx,
                  io.netty.channel.ChannelPromise promise)
           throws Exception

Specified by:

close in interface io.netty.channel.ChannelOutboundHandler

Overrides:

close in class SimpleChannelDuplexHandler<Message,Message>

Throws:

Exception

channelWrite0

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

Description copied from class: SimpleChannelDuplexHandler

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

Specified by:

channelWrite0 in class SimpleChannelDuplexHandler<Message,Message>

Parameters:

ctx - the ChannelHandlerContext which this SimpleChannelDuplexHandler belongs to

msg - the message to handle

promise - the corresponding promise

processMessageAfterHandshake

protected void processMessageAfterHandshake(io.netty.channel.ChannelHandlerContext ctx,
                                            Message message)

channelActive

public void channelActive(io.netty.channel.ChannelHandlerContext ctx)
                   throws Exception

Specified by:

channelActive in interface io.netty.channel.ChannelInboundHandler

Overrides:

channelActive in class io.netty.channel.ChannelInboundHandlerAdapter

Throws:

Exception

startTimeoutGuard

protected void startTimeoutGuard(io.netty.channel.ChannelHandlerContext ctx)

rejectSession

protected void rejectSession(io.netty.channel.ChannelHandlerContext ctx,
                             ConnectionExceptionMessage.Error error)

exceptionCaught

public void exceptionCaught(io.netty.channel.ChannelHandlerContext ctx,
                            Throwable cause)

Specified by:

exceptionCaught in interface io.netty.channel.ChannelHandler

Specified by:

exceptionCaught in interface io.netty.channel.ChannelInboundHandler

Overrides:

exceptionCaught in class io.netty.channel.ChannelInboundHandlerAdapter