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From Tushar Gosavi <tus...@datatorrent.com>
Subject Re: Adding class to CLASSPATH in populateDAG
Date Fri, 08 Jan 2016 07:41:30 GMT
In past we achieved this by writing generated class to a jar file in /tmp
directory and adding that jar in LIBJARS_CONF_KEY_NAME
conf.set(StramAppLauncher.LIBJARS_CONF_KEY_NAME, conf.get(StramAppLauncher.
LIBJARS_CONF_KEY_NAME) + "," + generatedPojoJar);
This is a kind of hack and generated jar file does not get cleaned up as we
don't get any callback after application is submitted in
StreamingApplication. It may be
good idea to provide a api to register temp jar which will get copied to
application directory, and deleted (optionally) from local machine after
application is submitted.


On Fri, Jan 8, 2016 at 12:07 PM, Chinmay Kolhatkar <chinmay@datatorrent.com>

> Hi Everyone,
> I have a requirement where I need to add certain classes to classpath
> during application started (during initialization).
> I get to know the classes to be added to classpath only via property of
> application i.e. populateDAG method is the first point where I get to know
> what need to be added to classpath.
> The class I want to add primary defines what a tuple would look like.
> Basically properties will have the field information, populateDAG needs to
> generate the class and add it to classpath for all the operators.
> Creating a class is not a problem, but adding to classpath is.
> Is there a hook present in Apex platform where I can add given .class file
> to the classpath in populateDAG?
> If not, I was wondering if this will be a positive addition to the
> platform.
> I have some code already created for this. If everyone agrees this to be a
> good addition to platform, I'll be happy to work on this and contribute to
> the platform.
> Please share your thoughts.
> Thanks,
> Chinmay.

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