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Great, I think it is much more clear now.
I also think we should rename SyncMode and SyncType, these names are confusing.

> -----Original Message-----
> From: EXT Har-Tal, Liat (Nokia - IL) [mailto:liat.har-tal at nokia.com]
> Sent: Monday, April 11, 2016 9:44 AM
> To: openstack-dev at lists.openstack.org
> Subject: [openstack-dev] [vitrage] Synchronizer - explanation and name
> refactoring
> 
> Hi All,
> 
> In the last days I noticed that we have a big confusion with the main
> goal of the Synchronizer. This is in part due to mixed usage of the
> term Synchronizer in the project. Also, most of us don't really
> understand the difference between synchronizer and transformer.
> 
> After much discussion, it was decided to change and clarify the terms
> and the package structure - see more below.
> 
> So let's make order in this mess:
> 
> Synchronizer - Responsible for importing data into Vitrage. It is not
> supposed to make any change in the data.
> Transformer - Responsible for transforming the data retrieved by the
> synchronizer into a Vitrage entity (vertex) and its neighbors. Each
> neighbor is just a placeholder vertex and edge.
> 
> Recently, we realized that the terminology we use is incorrect: we use
> synchronizer name for both:
>  - General name of the whole process (connect to data source -> import
> the data into Vitrage -> push it to event queue -> and transform it to
> graph entities)
>  - For the actual connection to the data source (i.e., connection to
> Nova)
> 
> So we decided to have some name changes:
> 1. Datasource - describes the data source 2. Driver - describes the
> component which connect to data source itself 3. MessageFormat/
> FormatType / EventFormat - (not closed yet) instead of SyncMode. Any
> suggestion is welcome... 4. Name - instead of SyncType 5. No more using
> the word "plugins"
> 
> This change causes a change the packages structure in the project.
> Before the structure was:
> 
> - Synchronizer
>   - Plugins
>     - Data source name
>       - Transformer
>       - synchronizer
> 
> The new structure is:
> 
> - Datasources
>   - Data source name
>     - Transformer
>     - driver
> 
> Most of the refactoring has already done and pushed.
> 
> Action items:
> 1. To decide about new name for SyncMode and change it in the code 2.
> SyncType refactoring 3. Documentation
> 
> Liat.
>