Re: [jbosscache-dev] Re: Non Blocking State Transfer Status (& Integration with JGroups)
I'd do exactly the same; whether you do the copying in JGroups or user
space results in the same amount of copying...
Once NIO2 gets implemented, with scattering/gathering writes/reads, this
is a different story because we can then get rid of copies. That's going
to take a while though...
Manik Surtani wrote:
On 6 Jan 2009, at 22:05, Brian Stansberry wrote:
>
> BTW, is a *JGroups* streaming API necessary here? The old AS Farm
> service passed arbitrary sized files by sending byte[] chunks via
> RpcDispatcher calls. Worked fine. That's not quite what JBC would
> need, since FarmService read a chunk from a FileInputStream and
> passed it to JGroups; you'd want an OutputStream impl that would pass
> a chunk to JGroups when it's internal buffer reached size X.
This could be done but this would involve excessive copying of
buffers. The whole purpose behind the JGroups streaming JIRA is to
optimise away such unnecessary buffer copying between layers.
--
Manik Surtani
Lead, JBoss Cache
http://www.jbosscache.org
manik(a)jboss.org <mailto:manik@jboss.org>
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--
Bela Ban
Lead JGroups / Clustering Team
JBoss - a division of Red Hat