[Kde-pim] How Resources and Collections play together

[Christian Mollekopf]

Hi,

I'm a bit confused how akonadi resources and collections play together 
exactly.

As far as I understand it, a collection is the akonadi internal container. 
While the collection doesn't need a resource to exist, a resource is needed to 
make the link to the storage backend (filesystem, google, etc.).

So if i want a new calendar I create a new calendar resource (not a 
collection), which will in turn generate a new collection, associated with the 
resource.

So I assume normally there is 1 resource with 1 associated collection, but 
there can be special resources which have several collections.


What I need to know:

Is the resource responsible for creating/deleting the collections? 
So as an application developer, do I always work with resources not 
collections (speaking of creating/deleting toplevel collections(respectively 
storage locations))?

If I want to make a dialog where the user can choose, where to store his 
calendar files, is it ok to display a list of collections with the mimetype 
which i need? Or should I somehow list the resources?

In the ChangeRecorder for the EntityTreemodel, should I rather watch the 
collections or the resources? Whats the difference?

Can Collections contain items without a resource associated?
If I want to have a trash collections for items of various mimetypes, can I 
create a collection directly from my app, without a resource? I just want to 
keep the items there for a couple of days and then delete them.

Would it make sense to create a trash resource, which accepts all kinds of 
mimetypes, and deletes the items after a configured time, or is that not the 
purpose of resources?

Thanks for your help,

Chris
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