On Tue, Jan 27, 2015 at 4:01 PM, Justin Deoliveira <jdeol...@gmail.com>
wrote:
> Right, this also came up in a thread on geoserver users. The current
>> design is by sponsor spec, but towards the end of the development I also
>> would have liked to have something more generic, where you would specify
>> a name and a SOLR filter to go with it... it was just going to take too
>> much time to develop it along with a user interface to go with it.
>>
>> I see. Not sure what you had in mind for ui but I was thinking this would
> just boil down to another text field and perhaps a dropdown to choose the
> mapping mode.
>
Yeah, for having "everything as a single layer" this will work.
The UI I had in mind was in line with sql views, where you have a "create
new feature type" link, give it a name, a CQL/SOLR query, a selection of
attributes.
>
>
>> I also did not think that adding an attribute to select the layers
>> ownership would have been such a problem, SOLR has ways to add an
>> attribute to all documents, and set its value, and documents are
>> unstructured anyways. So... is the problem an issue of search efficiency?
>>
>
> A couple of problems. First is I am working with customers that have very
> large indexes, some more complex than others with index clustering, etc...
> so we want to avoid having them do any sort of mass update, and updating
> there ingestion pipelines to add the new attribute to new documents, etc...
> then is also the question of how to handle documents in multiple layers?
> Multi-values attributes perhaps, but I think it gets more complex pretty
> quickly.
>
> Second is the static nature of it. We don't know ahead of time what types
> of searches people are going to run so we can't really organize the
> documents into layers ahead of time. Instead we'll be leaning on the
> viewparams feature that is already there.
>
I see.
>
>>
>>> The approach i am thinking of is to add a "MappingStrategy" interface
>>> that would encapsulate how documents in the index are mapped to features.
>>> Given the unstructured nature of document storage in lucene I imagine this
>>> interface could prove useful in order to support additional future mapping
>>> strategies.
>>>
>>
>> Wondering again if this might affect how filters should be encoded, and
>> if MappingStrategy should have a say in the filter capabilties, or given
>> a chance to alter the filter, or split it in a encodable/not encodable
>> part.
>>
>
> Yeah, thought about that and we could definitely add filter capabilities
> to the new interface. One issue though. Filter capabilities are advertised
> by a datastore globally for the datastore. A single document may have
> fields with different types, that may have different native filtering
> capabilities. Not sure how we handle that... take the union of all filter
> capabilities?
>
Uh... that's going to be loads of fun... not sure what to do about it
honestly. One would need a new type of splitter, one that takes a
capabilities per attribute.
>
>>
>>>
>>> The exisitng mapping strategy would of course remain the default and
>>> while I was planning to add a few additional data store parameters to
>>> control the mapping configuration it will remain 100% backward compatible
>>> (important for geoserver users who already have data store configurations
>>> out there).
>>>
>>
>> Yep, that would work. I am wondering, the code in GeoServer relies on the
>> current mapping strategy also at the level of attribute
>> selection, there is dedicated GUI for it.
>> How will the new mapping strategy fit into it? Like will the GUI just
>> gets disabled because the newer mapping strategy just
>> picks the attributes it likes internally?
>>
>> I was thinking that the attribute selection would remain orthogonal to
> the mapping strategy being used. Or am I missing something? At least of the
> mapping strategy I plan to implement I don't need to "pre-select" any
> attributes. But I guess this is something that we could add to the new
> interface.
>
Oh ok, so the mapping strategy would be mostly choosing what's inside a
certain layer (the documents matching it), and not something that
selects/transforms attributes
like in app-schema? Sorry, when I heard mapping I though you were talking
about something like app-schema mapping.
Maybe you could choose a different name? Like uh... ContentStrategy?
Anyways, not a big deal, as long as it
has a descriptive javadoc you can call it what you want (no, not WWW
please!).
Cheers
Andrea
--
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