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Thanks for the pointer, Charles.

Right now nderground uses email notifications content posts, but I would like to implement push notifications for logged in users. So I’ve been looking for resources to make this as easy as possible.

Unfortunately, I don’t think that ZeroMQ will for for us: “ZeroMQ is from iMatix and is LGPLv3 open source.”

The LGPLv3 license, as I understand it, only allows proprietary software to remain private if the LGPLv3 licensed software is not directly linked into the code. An example that was given is a shared library.

nderground is implemented in Groovy and Java. The code is deployed as a WAR file. To the extent that JVM languages are ever linked, it seems like this is a monolithic link and LGPL would be a problem. It’s too bad that they did not use one of the other licenses, like Apache or Berkeley UNIX.

But I will definitely follow your suggestion and read the ZeroMQ documentation. After all, who can resist technical documentation like this:

We took a normal TCP socket, injected it with a mix of radioactive isotopes stolen from a secret Soviet atomic research project, bombarded it with 1950-era cosmic rays, and put it into the hands of a drug-addled comic book author with a badly-disguised fetish for bulging muscles clad in spandex.

https://github.com/imatix/zguide/raw/master/images/fig1.png

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