Christoph Hormann wrote:
> David Bucciarelli wrote:
> 
>> [...]
>>
>> I hope this has answered to your question.
>>
> 
> No, i was not asking for the caching mechanism, i was interested in 
> information about the method of *transport* of data between the nodes. I 
> assume some kind of network protocol.  Are there 
> authentification/encryption techniques used (would be important for use 
> via internet)?


The client and all the workers are connected to the server by using 
TCP/IP sockets. The default port 10101 is used by the server to receive 
client connections and default port 10102 is used to receive worker 
connections. You can use command line options in order to change default 
ports. The clients and workers can be beyond a NAT. If the server is 
beyond a NAT, you have to map used ports to the server.

The JCGrid communication protocol between client/server/worker uses Java 
Object Serialization in order to exchange messages. Exchanged data can 
be compressed (GZIP) by using a command line option in order to save 
bandwidth. SSL encryption can be enabled by using a command line option 
too. The access to the server can be restricted by using a password.

You can setup public grid over Internet with anonymous access. People 
can donate their CPU time and use other user's CPU like in P2P network.

NOTE: JCGrid is still in a very early stage of the development and 
setting up a public anonymous Grid is too dangerous. Enabling encryption 
is untested too and require some more complex setup (creating the Java 
keystore, etc.).

Any other question ?

David Bucciarelli
Pisa
Italy

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