Joshua Kramer wrote:
Howdy Folks,
I wanted to throw out an idea. Is anybody using QPid to pass messages
based on Google's Protocol Buffers (PB)? Would it be beneficial to
write an exchange that routes messages based on something like a
jquery, only on PB messages instead of XML?
I am using Protocol Buffers in a blog I'm creating. The front end,
based in Django, sends requests via PB through Qpid to some
Rpython-based modeling software I wrote. PB took less time to
implement in Python than a comparable XML solution would have taken.
From the PB site: "Protocol buffers are what you use if your network
link is already saturated and your CPU's are already overused." They
are 3 to 10 times smaller, and 20 to 100 times faster than XML. You
write a definition of your data's structure, then the PB compiler will
give you objects in Java, Python, or C++. Far easier to use than XML.
http://code.google.com/apis/protocolbuffers/
Cheers,
-Josh
Josh,
I expect it would be quite easy to do, I have skimmed the PB stuff. The
XML XQuery exchange is a plugin to the broker which is much
the same pattern and can be found here
https://svn.apache.org/repos/asf/qpid/trunk/qpid/cpp/src/qpid/xml/
As you can see, it subclasses the exchange, and when the plugin loads it
registers the XQuery exchange. This part would be 90%
the same for PB plugin.
In
https://svn.apache.org/repos/asf/qpid/trunk/qpid/cpp/src/qpid/xml/XmlExchange.cpp
you would have to re-implement specifically for PB,
i.e. how you want binding specified, and what lib to call on the PB
side, or code the routing part.
I would copy the xml dir to protocolBuffer dir and use these 4 files as
the starting point for a PB exchange plug-in.
Finally, there is a .mk one level up that will need the PB plugin added
to the make process. If you do the PB stuff etc, I'll be glad to help
with the project integration stuff.
regards
Carl.
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