[zeromq-dev] ByteBuffer API for JZMQ

Joel Lauener Joel.Lauener at cern.ch
Tue May 14 12:11:01 CEST 2013

Hi Trevor,

What is the purpose of int recvByteBuffer(int flags) ?

Will this be a true 0 copy implementation? Or will the buffer still be copied within the send/receive call? I guess the latest because as far as I understand there is no way to pass ownership of data between Java and Native code.

I'm already looking forward to performance measurement. This looks interesting.

Message: 3
Date: Mon, 13 May 2013 13:58:32 -0300
From: Trevor Bernard <trevor.bernard at gmail.com>
Subject: [zeromq-dev] ByteBuffer API for JZMQ
To: ZeroMQ development list <zeromq-dev at lists.zeromq.org>
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In the next couple of days I will be writing a ByteByffer API for JZMQ I would like to hear the communities thoughts.

I was thinking of something along the lines of:

int sendByteBuffer(ByteBuffer bb, int flags); int recvByteBuffer(ByteBuffer bb, int flags); int recvByteBuffer(int flags);

Implementation seems straightforward enough. Though it really only makes sense to use a Direct ByteBuffer since it's allocated off the heap and can be passed to libzmq without a copy. Otherwise you'd have to copy the underlying byte[].

So does it make sense to only support a direct bytebuffer?


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