org.jgroups.protocols
Class TUNNEL

java.lang.Object
  extended by org.jgroups.stack.Protocol
      extended by org.jgroups.protocols.TP
          extended by 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 org.jgroups.protocols.TP
TP.ProbeHandler, TP.ProtocolAdapter
 
Field Summary
 
Fields inherited from class org.jgroups.protocols.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 org.jgroups.stack.Protocol
down_prot, log, props, stack, stats, up_prot
 
Constructor Summary
TUNNEL()
           
 
Method Summary
 java.lang.String getInfo()
           
 java.lang.String getName()
           
 long getReconnectInterval()
           
 java.lang.String getRouterHost()
           
 int getRouterPort()
           
 java.lang.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(java.util.Properties props)
          Setup the Protocol instance acording to the configuration string
 void setReconnectInterval(long reconnect_interval)
           
 void setRouterHost(java.lang.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().
 java.lang.String toString()
          debug only
 
Methods inherited from class org.jgroups.protocols.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 org.jgroups.stack.Protocol
downThreadEnabled, enableStats, getDownProtocol, getProperties, getProtocolStack, getTransport, getUpProtocol, printStats, providedDownServices, providedUpServices, requiredDownServices, requiredUpServices, setDownProtocol, setPropertiesInternal, setProtocolStack, setUpProtocol, statsEnabled, upThreadEnabled
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

TUNNEL

public TUNNEL()
Method Detail

toString

public java.lang.String toString()
Description copied from class: TP
debug only

Overrides:
toString in class TP

getRouterHost

public java.lang.String getRouterHost()

setRouterHost

public void setRouterHost(java.lang.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 java.lang.String getName()
Specified by:
getName in class Protocol

init

public void init()
          throws java.lang.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:
java.lang.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 java.lang.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:
java.lang.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(java.util.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 java.lang.Object handleDownEvent(Event evt)
Overrides:
handleDownEvent in class TP

sendToAllMembers

public void sendToAllMembers(byte[] data,
                             int offset,
                             int length)
                      throws java.lang.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
Throws:
java.lang.Exception

sendToSingleMember

public void sendToSingleMember(Address dest,
                               byte[] data,
                               int offset,
                               int length)
                        throws java.lang.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
Throws:
java.lang.Exception

getInfo

public java.lang.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


Copyright ? 1998-2008 Bela Ban. All Rights Reserved.