Simple socket-based TCP repeater.

Code attached. Note that the StreamRepeater class has a rather large copy buffer
(32KB). Reducing this to 4KB results in throughput reducing to ~210 Mbit/s.


=================================================================================
Test setup:

Host A (iperf client) <-> Host B (Simple tunnel) <-> A (iperf server)

Host A: CentOS 5.5, iperf 2.0.5, gigabit NIC. 192.168.254.40
Host B: Windows 7 x64, JDK 6u29, running in Eclipse, gigabit NIC. 192.168.254.122


=================================================================================
Changes made to Tunnel sample:

public static final String HOST = "192.168.254.122";
public static final int PORT = 5001;

public static final String REDIRECT_HOST = "192.168.254.40";
public static final int REDIRECT_PORT = 5001;


=================================================================================
HOST A - IPERF CLIENT LOG:

[root@lnbackup1 grizzly]# iperf -t 10 -i 1 -c 192.168.254.122
------------------------------------------------------------
Client connecting to 192.168.254.122, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.254.40 port 37096 connected with 192.168.254.122 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  81.0 MBytes   679 Mbits/sec
[  3]  1.0- 2.0 sec  81.8 MBytes   686 Mbits/sec
[  3]  2.0- 3.0 sec  82.0 MBytes   688 Mbits/sec
[  3]  3.0- 4.0 sec  82.0 MBytes   688 Mbits/sec
[  3]  4.0- 5.0 sec  82.4 MBytes   691 Mbits/sec
[  3]  5.0- 6.0 sec  82.2 MBytes   690 Mbits/sec
[  3]  6.0- 7.0 sec  82.1 MBytes   689 Mbits/sec
[  3]  7.0- 8.0 sec  82.0 MBytes   688 Mbits/sec
[  3]  8.0- 9.0 sec  82.5 MBytes   692 Mbits/sec
[  3]  9.0-10.0 sec  81.9 MBytes   687 Mbits/sec
[  3]  0.0-10.0 sec   820 MBytes   688 Mbits/sec



=================================================================================
HOST A - IPERF SERVER (CONSUMER) LOG:

[root@lnbackup1 ~]# iperf -i 1 -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.254.40 port 5001 connected with 192.168.254.122 port 49567
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0- 1.0 sec  81.7 MBytes   686 Mbits/sec
[  4]  1.0- 2.0 sec  81.7 MBytes   685 Mbits/sec
[  4]  2.0- 3.0 sec  82.0 MBytes   688 Mbits/sec
[  4]  3.0- 4.0 sec  82.2 MBytes   689 Mbits/sec
[  4]  4.0- 5.0 sec  82.1 MBytes   689 Mbits/sec
[  4]  5.0- 6.0 sec  82.3 MBytes   691 Mbits/sec
[  4]  6.0- 7.0 sec  82.2 MBytes   689 Mbits/sec
[  4]  7.0- 8.0 sec  82.1 MBytes   689 Mbits/sec
[  4]  8.0- 9.0 sec  82.3 MBytes   690 Mbits/sec
[  4]  9.0-10.0 sec  81.4 MBytes   683 Mbits/sec
[  4]  0.0-10.0 sec   820 MBytes   688 Mbits/sec