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  java.nio cyclic buffer?  (Read 1935 times)
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Offline Markus_Persson

JGO Wizard


Medals: 16
Projects: 19


Mojang Specifications


« Posted 2003-08-18 18:34:44 »

In order to decrease the byte-copying needed with non-blocking socket channels, I figured I could just write my own "PipeBuffer" that provides an InputByteBuffer- and OutputByteBuffer-view of the same underlying ByteBuffer. That buffer would be treated as a cyclic buffer

This would allow the client and server to just keep any unsent data from a SocketChannel.write() call to stay in the buffer without having to allocate a new buffer or move the remaining bytes to the start of the buffer.


Unfortunately, the constructor of ByteBuffer is package private, so that made me thing I'm probably attempting to do something I shouldn't.
Does anyone have any better suggestions?

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Offline elias

Senior Duke





« Reply #1 - Posted 2003-08-18 19:23:04 »

Moving the remaining bytes to the front is done with buffer.compact() and I think that has lower overhead than housekeeping a cyclic buffer (always doing an index modulo). Just IMHO.

- elias

Offline Markus_Persson

JGO Wizard


Medals: 16
Projects: 19


Mojang Specifications


« Reply #2 - Posted 2003-08-18 20:04:18 »

Ok, I'll just forget about this nonsense.


Premature optimisation is evil, mmk? Wink
*deletes silly code*

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Offline darcone

Junior Duke




Size matters


« Reply #3 - Posted 2003-08-18 20:13:43 »

Wink There are many "optimisations" you can do with .nio... But they often turn out to make things worse instead ;P
Offline Markus_Persson

JGO Wizard


Medals: 16
Projects: 19


Mojang Specifications


« Reply #4 - Posted 2003-08-18 20:15:04 »

Hehe.

I keep telling people not to do this kind of pointless work, yet I always break down and do it myself from time to time. Heh.

I have to start trusting java more.

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Offline blahblahblahh

JGO Coder


Medals: 1


http://t-machine.org


« Reply #5 - Posted 2003-08-20 12:57:35 »

Quote
Hehe.

I keep telling people not to do this kind of pointless work, yet I always break down and do it myself from time to time. Heh.
.


...but cyclic buffers are not merely an optimisation. They are a useful datatype in their own right. I have on several occasions been mightily annoyed by the lack of cyclic buffers in java...there are some algorithms which are just well-suited to using them.

malloc will be first against the wall when the revolution comes...
Offline Markus_Persson

JGO Wizard


Medals: 16
Projects: 19


Mojang Specifications


« Reply #6 - Posted 2003-08-20 13:28:06 »

Yeah, optimising the networking in wurm wasn't the only reason I wanted to make them.. it also seemed like a fun thing to spend a couple of hours on.


Now someone explain to me why the ByteBuffer constructor is package private. Wink

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Offline xfactor973

Senior Newbie




Java games rock!


« Reply #7 - Posted 2003-08-20 22:23:48 »

i say just make it public,recompile and stick the class back into your rt.jar.    Wink
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