Package org.drasyl.handler.remote

Class LocalHostDiscovery

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelInboundHandlerAdapter

io.netty.channel.ChannelDuplexHandler

org.drasyl.handler.remote.LocalHostDiscovery

All Implemented Interfaces:

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

public class LocalHostDiscovery
extends io.netty.channel.ChannelDuplexHandler

Uses the file system to discover other drasyl nodes running on the local computer.

To do this, all nodes regularly write their UdpServer address(es) to the file system. At the same time the file system is monitored to detect other nodes. If the file system does not support monitoring (WatchService), a fallback to polling is used.

Inspired by: Jadex

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	FILE_SUFFIX
static Duration	REFRESH_INTERVAL_SAFETY_MARGIN
static Duration	WATCH_SERVICE_POLL_INTERVAL

Constructor Summary

Constructors

Constructor	Description
LocalHostDiscovery(int networkId, boolean watchEnabled, Duration leaseTime, Path path)

Method Summary

Modifier and Type	Method	Description
void	channelInactive(io.netty.channel.ChannelHandlerContext ctx)
void	userEventTriggered(io.netty.channel.ChannelHandlerContext ctx, Object evt)
void	write(io.netty.channel.ChannelHandlerContext ctx, Object msg, io.netty.channel.ChannelPromise promise)

Methods inherited from class io.netty.channel.ChannelDuplexHandler

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

Methods inherited from class io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelRead, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, 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

handlerAdded, handlerRemoved

Field Detail

REFRESH_INTERVAL_SAFETY_MARGIN

public static final Duration REFRESH_INTERVAL_SAFETY_MARGIN

WATCH_SERVICE_POLL_INTERVAL

public static final Duration WATCH_SERVICE_POLL_INTERVAL

FILE_SUFFIX

public static final String FILE_SUFFIX

See Also:

Constant Field Values

Constructor Detail

LocalHostDiscovery

public LocalHostDiscovery(int networkId,
                          boolean watchEnabled,
                          Duration leaseTime,
                          Path path)

Method Detail

write

public void write(io.netty.channel.ChannelHandlerContext ctx,
                  Object msg,
                  io.netty.channel.ChannelPromise promise)
           throws Exception

Specified by:

write in interface io.netty.channel.ChannelOutboundHandler

Overrides:

write in class io.netty.channel.ChannelDuplexHandler

Throws:

Exception

channelInactive

public void channelInactive(io.netty.channel.ChannelHandlerContext ctx)

Specified by:

channelInactive in interface io.netty.channel.ChannelInboundHandler

Overrides:

channelInactive in class io.netty.channel.ChannelInboundHandlerAdapter

userEventTriggered

public void userEventTriggered(io.netty.channel.ChannelHandlerContext ctx,
                               Object evt)

Specified by:

userEventTriggered in interface io.netty.channel.ChannelInboundHandler

Overrides:

userEventTriggered in class io.netty.channel.ChannelInboundHandlerAdapter