[lttng-dev] Java code for CTF trace writing?

[Matthew Khouzam]

Hi all,
Just to mention, everything Philippe said was 100% true, we just right
now are too stretched to add the trace writer to eclipse. It will be
integrated fairly soon, I think.
Matt


On 13-04-15 06:01 PM, Philippe Proulx wrote:
> Actually, that was the exact purpose of my internship at Ericsson last summer.
>
> I designed a new architecture for the CTF part of TMF, but it is still
> not merged/integrated with mainline TMF (I don't even know if it's
> still planned). See
> <http://git.dorsal.polymtl.ca/~pproulx?p=javeltrace.git;a=summary>.
>
> This new architecture is able to read _and write_ CTF packets in a
> generic way. The "Javeltrace" name is just a portmanteau of Java and
> Babeltrace, although should this refined library be integrated into
> TMF, it's not planned to be named like this. However, there exist a
> command-line tool that I made which is officially named Javeltrace and
> uses the aforementioned library. It is described here:
> <http://www.dorsal.polymtl.ca/~pproulx/javeltrace/>. As explained on
> the webpage, the main goal of this utility is to test my work
> interactively.
>
> Keep in mind that everything mentioned here is not thoroughly tested
> and for sure there are a few bugs remaining. Also, the code didn't
> evolve with the latest CTF versions, so there must be incompatibility
> at some level.
>
> The main use case at Ericsson was to synthesize a precise fake trace
> from scratch using a human readable input format that could be
> versioned. The generated CTF traces would then be used to exercise
> parts of TMF to test specific behaviours without having to produce an
> actual real trace. After a few discussions, we chose JSON as an
> interchange format. So you will see lots of JSON related code out
> there. The command-line Javeltrace utility is able to translate
> from/to binary CTF.
>
> At the end of my internship, I started writing docs for what I did.
> It's here: <http://wiki.eclipse.org/Linux_Tools_Project/TMF/CTF_guide>.
> It's not finished, but almost, so it should be up-to-date with my Git
> codebase.
>
> I also made this as a proof of concept:
> <http://git.dorsal.polymtl.ca/~pproulx?p=javeltrace.git;a=tree;f=lttng/org.eclipse.linuxtools.ctf.core/src/org/eclipse/linuxtools/ctf/core/trace/out;h=67ab3097e9f3fc52a685d29620e4c40ee26ee896;hb=47b4cef68eb4524fc9e1865f58474e0bc81eba77>
> (see all Mug*.java files). MugTracer is a simple Java tracer that
> produces native CTF without even using the rest of my library since
> CTF is so easy to *write*. It has a consumer thread and worked well,
> although I didn't run any benchmark and I believe it's really slow
> compared to UST.
>
> Feel free to contact me, should you have any question about this.
>
> On 15 April 2013 17:14, Aaron Spear <aspear at vmware.com> wrote:
>> Hi all,
>>
>> I was wondering if anyone knew of some open source Java library that could WRITE CTF traces? I am using the linuxtools/TMF plugins to read CTF traces, but now need to write them from Java as well.
>>
>> I have a use case where I have an "event bus" in the Java app world and I would like to persist this event stream as a CTF trace. In this particular use case, the speed/low intrusiveness of LTTng UST is not as important as the portability, so a pure Java solution is ideal, though not strictly required.
>>
>> Also, please let me know if there are others out there who are interested in collaborating in writing such a library.
>>
>> regards,
>> Aaron Spear
>>
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