Q&A with Trustin Lee - How would I splice things with ChannelBuffer(s) ?

Tue Dec 2 20:34:47 EST 2008

Thanks fdev for sharing this for community! :)

Cheers,
Trustin

On Tue, Dec 02, 2008 at 03:34:08PM +0900, Flash Developer wrote:
> fdev:
> I was wondering whether it's OK to pass around things as Strings (that
> originate from a ChannelBuffer source),
> or whether it's best to keep things as ChannelBuffer(s) for as long as possible?
> 
> trustin lee:
> hmm.. from which perspective? performance, or flexibility?
> 
> fdev:
> well, dare I say performance...? The issue is that eventually,  I need
> to find the <head> tag within an ICAP response
> and inject things before/after it, so I think eventually, it has to be
> converted to a java.lang.String and back, right?
> 
> trustin lee:
> Ah OK.
> If it's not a UTF-16 document, then I think it's safe to use
> ChannelBuffer directly.
> ChannelBuffer provides indexOf operation so you will be able to find
> the <head> tag.
> and you can create two slices from the channel buffer - one that ends
> with the <head> tag and the other.
> and then.. you could create a new ChannelBuffer which contains
> something you want to inject.
> Now you got three buffers
> 
> fdev:
> ok, interesting...
> 
> trustin lee:
> they can be combined into one buffer without memory copy.
> 
> fdev:
> ah, ok, that's what I was looking for... how?
> 
> trustin lee:
> .. using ChannelBuffers.wrappedBuffer(ChannelBuffer...)
> 
> fdev:
> ah, ok, that's exactly what I was looking for. Thanks!

-- 
Trustin Lee, Principal Software Engineer, JBoss, a division of Red Hat
--
what we call human nature in actuality is human habit
--
http://gleamynode.net/
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