[hibernate-dev] Required improvements for Infinispan's query engine

Gunnar Morling gunnar at hibernate.org
Tue Sep 10 04:28:51 EDT 2013

2013/9/9 Adrian Nistor <anistor at redhat.com>

>  Hi Gunnar,
> I currently use a single generic indexed entity which represents the
> multitude of protobuf defined domain types. This approach is not
> necessarily ideal but was forced to adopt it because of the way hsearch
> currently works. Other projects do the same (ModeShape is one such example).

Do you have a pointer for me where I can find your code integrating with
the parser? What I'm trying to find out is whether your GenericEntity is
used to map several of your ProtoBuf domain types in the context of one
SearchFactory instance or not.

If this the case, the SPI would need to work with a more abstract
representation of types than class objects, e.g.
getFieldBridge("com.example.MyDomainEntity", "myProperty") and also the
changes within HSEARCH will be a bit larger. If GenericEntity represented
always exactly one domain type in the context of one SearchFactory
instance, we could have the SPI look like
getFieldBridge(GenericEntity.class, "myProperty"), and hooking things into
HSEARCH would become a bit simpler.

> Having an SPI so I can provide my own field bridges seems like a good idea
> that would solve my current needs.
> Thanks,
> Adrian
> On 09/08/2013 02:33 PM, Gunnar Morling wrote:
>  Hi Adrian,
>  We have been contemplating some ideas around your requirements. Are you
> working with several "types" (as defined by ProtoBuf files) or only one
> such type per one of your caches (and thus afaics SearchFactory)?
>  In case of the latter, one idea would be that you always target your
> generic entity type with your queries and we provide an SPI which allows
> you to configure the field bridges to be applied for the individual fields
> of a given entity (here always the generic entity type), e.g.  FieldBridge
> getFieldBridge(Class<?> type, String fieldName). We could then query this
> SPI from within the HSEARCH-based parser backend to apply the right field
> bridges for a given query. You would create any FieldBridge instances
> yourself and thus could inject whatever data you need into them.
>  Would this address the needs of Infinispan?
>  If you need to work with several ProtoBuf types per SearchFactory, we'd
> have to do some more changes within HSEARCH, as the metadata essentially is
> keyed by class type atm. and we'd have to change that to key by a more type
> representation.
>  Thanks,
>  --Gunnar
>  2013/8/31 Emmanuel Bernard <emmanuel at hibernate.org>
>> Adrian found a few problematic limitations in Hibernate Search during
>> its integration of the HQL query parser and the Hibernate Search back
>> end.
>> Composite bridge::
>> https://hibernate.atlassian.net/browse/HSEARCH-1397
>> Injection of services into a FieldBridge::
>> https://hibernate.atlassian.net/browse/HSEARCH-1396
>> These two are important for Infinispan 6 and should be give priority.
>> I think they can be added in 4.4 without too much effort.
>> Thoughts?
>> Otherwise, support for mapping non Java object structures is something
>> we should do in Hibernate Search. For 5?
>> Is there a JIRA for it?
>> Emmanuel
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