+1 for adding plugging framework and extension mechanism to the cartridge agent. With my little finding, I think Yapsy may good for our requirement.
Also, can we make health checker also pluggable? Please see Shaheed comments in [1] [1]Hangout (01) to discuss the Python Agent On Thu, Nov 27, 2014 at 1:38 PM, Akila Ravihansa Perera <raviha...@wso2.com> wrote: > Hi, > > As you may know, Stratos 4.1.0 Alpha release will be shipped with a Python > based cartridge agent. AFAIU, there were two main reasons to move to a > Python based agent. > > 1. Make it light weight to minimize the memory/CPU footprint. This was > important especially in the Docker scenario. > > 2. Allow Dev-Ops to extend the cartridge agent without having to modify > the core code. In most cases, cartridge agent has to be customized to suite > the requirements of the cartridge application. All dynamic configuration > changes and stats publishing are done by this agent. It is therefore > critical to make the agent flexible enough so that users developing > cartridges are able to manage and monitor the run time environment of the > cartridge application, as they wish. > At the same time, the design has to be simple enough to make sure that > we're not adding more complexity. A dev-ops should be able to easily > understand the flow and extend it to cater the cartridge application run > time requirements. > > For this purpose I'd like to propose that we integrate a Python plugin > framework to make the cartridge agent easily extendable. Main requirements > are; > > 1. The plugin framework of choosing must be very easy to use > 2. Have minimal or no external dependencies to make it lightweight > 3. Should be able to dynamically load plugins without manual configurations > 4. Version control of plugins and be able to control the loading order > > I've done evaluation of following existing Python plugin frameworks; > Plug n' PLay (PnP) [1] > Trac [2] > Yapsy [3] > Zope [4] > > As per my findings, I've concluded that Yapsy would be the best fit for > our requirements. PnP framework is very simple but lacks some of the > features like version control, control the loading behavior. > > Here is a very good tutorial [5] for understanding the Yasy framework. I'd > like to work on an initial model for this integration. But before that > wanted to get your ideas regarding this feature. > > [1] https://github.com/daltonmatos/plugnplay > [2] http://trac.edgewall.org/wiki/TracDev/ComponentArchitecture > [3] http://yapsy.sourceforge.net/ > [4] http://docs.zope.org/zope.interface/ > [5] http://www.micahcarrick.com/python-gtk-plugins-with-yapsy.html > > Thanks. > > -- > Akila Ravihansa Perera > Software Engineer, WSO2 > > Blog: http://ravihansa3000.blogspot.com > -- Lakmal Warusawithana Vice President, Apache Stratos Director - Cloud Architecture; WSO2 Inc. Mobile : +94714289692 Blog : http://lakmalsview.blogspot.com/
