This discussion brought to mind an earlier one about sending large files
http://www.nabble.com/Question-for-transfering-large-file-tf4222408s16868.html#a12011448
What about the option of calculating the MD5 locally and then sending
the file and the checksum after that?
-Eero Nevalainen
[EMAIL PROTECTED] wrote:
Hi Trustin,
(sorry for so much mails ;-)
Bloking IO could be problematic so I will probably work on the second
option (in fact my initial thoughts).
My initial work was based on serialization but I fell like it could
be no as efficient as needed, so I need to rethink about it and write
a protocol from scratch which will include a MD5 check on each packet
(security and check of file transport is the key of this project).
Thank a lot
Frederic
Selon Trustin Lee <[EMAIL PROTECTED]>:
On Nov 22, 2007 3:51 AM, Frédéric Brégier <[EMAIL PROTECTED]> wrote:
Hi all,
I feel that the question I post inside my long previous mail should
be on a separate one, so here it is again. Sorry for the double post !
Just a question perhaps stupid :
I have the idea to perhaps use StreamWriteFilter or StreamIoHandler to
transfer some files
but with a protocol exchange before and after the file transfer (to verify
the access, the rules,
to make some pre or post operations, probably making an MD5 check of the
transfered file...).
I have look at the mailing list but I didn't find a good example of what
could be the best
but also I didn't understand how to "get" the file on the other side.
That is to say : I saw some code to send file (using StreamWF) but no on
receiving this file?
I'm surely missing something, obviously...
For now.. you can:
1) Use StreamIoHandler, which is not recommended because it makes MINA
work like a blocking I/O server. However, it's fine as long as you
limit the usage of the StreamIoHandler.
2) Create a chunk message so your decoder generate multiple chunks
with begin and end mark.
Please let me know if you have any better idea to deal with big files. :)
Trustin
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