Hi All,
Alvise Dorigo (INFN-Padova) sent the latest version of his java client
for xrootd. I've linked the files from the download section of xrootd page:
http://xrootd.slac.stanford.edu/
Quite a number of features are already supported: I've included Alvise's
current feature list below. Feel free to send any feedback or experiences
with this new client to the xrootd mailing list (Alvise is subscribed).
Pete
Here the status of the project:
Currently supported features:
1. Connection timeout (configurable)
2. Connection retrial (configurable number of time)
3. Configurable TCP Window Size
4. Physical connection garbage collecting (TTL configurable) using a thread
5. Logical to physical connection multiplexing
6. Socket broken pipe detection and handling using redirection/rebounce
7. Socket IO error detection and handling using redirection/rebounce
8. Explicit server redirection handling
9. Read cache (configurable size) with pre-read
10. Supported requests: chmod, rm, rmdir (server has a bug), read,
write, sync, stat, mkdir, open, mv, close, login
11. Remote server kind (data or LB) detection
12. handling of 'oksofar' response in order to transfer large chunks of data
13. handling of 'Wait' server's response
14. Synchronous communication (sending a request lock the communication until
a response is received)
15. Max redirection number handling (# configurable)
16. Request retry and max retry number handling
17. home-made Java semaphores, to be comatible with JDK 1.4.2. Useless
in JDK 1.5.0 because JDK 1.5.0 supports semaphores natively
18. Easy configuration file in simple format (property=value) or
in xml format (only with JDK 1.5.0)
19. Asynchronous communication
TODO:
1. Handling of unsolicited responses
2. Refresh request to LB in case of open failure
3. Multiple servers in URI
4. Need to deeply test the Multiclient on same channel and sync
communication in case of server error (socket IO or broken pipe)
5. Need to deeply test the redirection in a load balanced environment
6. Authentication support (for now only login is present)
ASYNC mode is still experimental and not fully tested.
If you want to explore the utility classes
(NetFileInputStream/NetFileOutputStream that extend
InputStream/OutputStream) with custom client please contact me for more
details.
have fun
Alvise
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Peter Elmer E-mail: [log in to unmask] Phone: +41 (22) 767-4644
Address: CERN Division PPE, Bat. 32 2C-14, CH-1211 Geneva 23, Switzerland
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