Class TUNNEL

java.lang.Object

org.jgroups.stack.Protocol

org.jgroups.protocols.TP

org.jgroups.protocols.TUNNEL

public class TUNNEL
extends TP

Replacement for UDP. Instead of sending packets via UDP, a TCP connection is opened to a Router (using the RouterStub client-side stub), the IP address/port of which was given using channel properties router_host and router_port. All outgoing traffic is sent via this TCP socket to the Router which distributes it to all connected TUNNELs in this group. Incoming traffic received from Router will simply be passed up the stack.

A TUNNEL layer can be used to penetrate a firewall, most firewalls allow creating TCP connections to the outside world, however, they do not permit outside hosts to initiate a TCP connection to a host inside the firewall. Therefore, the connection created by the inside host is reused by Router to send traffic from an outside host to a host inside the firewall.

Author:

Bela Ban

Nested Class Summary

Nested classes/interfaces inherited from class TP

TP.ProbeHandler, TP.ProtocolAdapter

Field Summary

Fields inherited from class TP

bind_addr, channel_name, discard_incompatible_packets, global_thread_factory, local_addr, members, persistent_ports, persistent_ports_file, pm, pm_expiry_time, thread_naming_pattern, timer, timer_thread_factory, view

Fields inherited from class Protocol

down_prot, log, props, stack, stats, up_prot

Constructor Summary

Constructors

Constructor	Description
TUNNEL()

Method Summary

Modifier and Type	Method	Description
String	getInfo()
String	getName()
long	getReconnectInterval()
String	getRouterHost()
int	getRouterPort()
Object	handleDownEvent(Event evt)
void	init()	Called after instance has been created (null constructor) and before protocol is started.
void	postUnmarshalling(Message msg, Address dest, Address src, boolean multicast)
void	postUnmarshallingList(Message msg, Address dest, boolean multicast)
void	sendToAllMembers(byte[] data, int offset, int length)	Send to all members in the group.
void	sendToSingleMember(Address dest, byte[] data, int offset, int length)	Send to all members in the group.
boolean	setProperties(Properties props)	Setup the Protocol instance acording to the configuration string
void	setReconnectInterval(long reconnect_interval)
void	setRouterHost(String router_host)
void	setRouterPort(int router_port)
void	start()	Creates the unicast and multicast sockets and starts the unicast and multicast receiver threads
void	stop()	This method is called on a Channel.disconnect().
String	toString()	debug only

Methods inherited from class TP

createThreadPool, destroy, down, dumpStats, getBindAddress, getBindPort, getBindToAllInterfaces, getChannelName, getDefaultThreadPool, getDefaultThreadPoolThreadFactory, getIncomingKeepAliveTime, getIncomingMaxPoolSize, getIncomingMaxQueueSize, getIncomingMessages, getIncomingMinPoolSize, getIncomingPoolSize, getIncomingQueueSize, getLocalAddress, getMaxBundleSize, getMaxBundleTimeout, getNumBytesReceived, getNumBytesSent, getNumMessagesReceived, getNumMessagesSent, getOOBKeepAliveTime, getOOBMaxPoolSize, getOOBMaxQueueSize, getOOBMessages, getOOBMinPoolSize, getOOBPoolSize, getOOBQueueSize, getOOBThreadPool, getOOBThreadPoolThreadFactory, getReceiveInterfaces, getSendInterfaces, getSingletonName, getThreadFactory, getThreadNamingPattern, getTimer, getTimerThreadFactory, getUpProtocols, handleConfigEvent, handleConnect, handleDisconnect, isDefaulThreadPoolEnabled, isDiscardIncompatiblePackets, isEnable_unicast_bundling, isEnableBundling, isLoopback, isOOBThreadPoolEnabled, isReceiveOnAllInterfaces, isSendOnAllInterfaces, isUseIncomingPacketHandler, passToAllUpProtocols, receive, registerProbeHandler, resetStats, sendUpLocalAddressEvent, setBindAddress, setBindPort, setBindToAllInterfaces, setDefaultThreadPool, setDefaultThreadPoolThreadFactory, setDiscardIncompatiblePackets, setEnable_unicast_bundling, setEnableBundling, setIncomingKeepAliveTime, setIncomingMaxPoolSize, setIncomingMinPoolSize, setLoopback, setMaxBundleSize, setMaxBundleTimeout, setOOBKeepAliveTime, setOOBMaxPoolSize, setOOBMinPoolSize, setOOBThreadPool, setOOBThreadPoolThreadFactory, setThreadFactory, setThreadNames, setTimerThreadFactory, unregisterProbeHandler, unsetThreadNames, up

Methods inherited from class Protocol

downThreadEnabled, enableStats, getDownProtocol, getProperties, getProtocolStack, getTransport, getUpProtocol, printStats, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, setDownProtocol, setPropertiesInternal, setProtocolStack, setUpProtocol, statsEnabled, upThreadEnabled

Methods inherited from class Object

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

Constructor Details

TUNNEL

public TUNNEL()

Method Details

toString

public String toString()

Description copied from class: TP

debug only

Overrides:

toString in class TP

getRouterHost

public String getRouterHost()

setRouterHost

public void setRouterHost(String router_host)

getRouterPort

public int getRouterPort()

setRouterPort

public void setRouterPort(int router_port)

getReconnectInterval

public long getReconnectInterval()

setReconnectInterval

public void setReconnectInterval(long reconnect_interval)

getName

public String getName()

Specified by:

getName in class Protocol

init

public void init()
          throws Exception

Description copied from class: Protocol

Called after instance has been created (null constructor) and before protocol is started. Properties are already set. Other protocols are not yet connected and events cannot yet be sent.

Overrides:

init in class TP

Throws:

Exception - Thrown if protocol cannot be initialized successfully. This will cause the ProtocolStack to fail, so the channel constructor will throw an exception

start

public void start()
           throws Exception

Description copied from class: TP

Creates the unicast and multicast sockets and starts the unicast and multicast receiver threads

Overrides:

start in class TP

Throws:

Exception - Thrown if protocol cannot be started successfully. This will cause the ProtocolStack to fail, so Channel.connect(String) will throw an exception

stop

public void stop()

Description copied from class: Protocol

This method is called on a Channel.disconnect(). Stops work (e.g. by closing multicast socket). Will be called from top to bottom. This means that at the time of the method invocation the neighbor protocol below is still working. This method will replace the STOP, STOP_OK, CLEANUP and CLEANUP_OK events. The ProtocolStack guarantees that when this method is called all messages in the down queue will have been flushed

Overrides:

stop in class TP

setProperties

public boolean setProperties(Properties props)

Setup the Protocol instance acording to the configuration string

Overrides:

setProperties in class TP

Returns:

true if no other properties are left. false if the properties still have data in them, ie , properties are left over and not handled by the protocol stack

handleDownEvent

public Object handleDownEvent(Event evt)

Overrides:

handleDownEvent in class TP

sendToAllMembers

public void sendToAllMembers(byte[] data,
 int offset,
 int length)
                      throws Exception

Description copied from class: TP

Send to all members in the group. UDP would use an IP multicast message, whereas TCP would send N messages, one for each member

Specified by:

sendToAllMembers in class TP

Parameters:

data - The data to be sent. This is not a copy, so don't modify it

offset -

length -

Throws:

Exception

sendToSingleMember

public void sendToSingleMember(Address dest,
 byte[] data,
 int offset,
 int length)
                        throws Exception

Description copied from class: TP

Send to all members in the group. UDP would use an IP multicast message, whereas TCP would send N messages, one for each member

Specified by:

sendToSingleMember in class TP

Parameters:

dest - Must be a non-null unicast address

data - The data to be sent. This is not a copy, so don't modify it

offset -

length -

Throws:

Exception

getInfo

public String getInfo()

Specified by:

getInfo in class TP

postUnmarshalling

public void postUnmarshalling(Message msg,
 Address dest,
 Address src,
 boolean multicast)

Specified by:

postUnmarshalling in class TP

postUnmarshallingList

public void postUnmarshallingList(Message msg,
 Address dest,
 boolean multicast)

Specified by:

postUnmarshallingList in class TP