[hibernate-issues] [JIRA] (HSEARCH-3975) Expose scrolling operations through JPA/ORM queries

[Yoann Rodière (JIRA)]

Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A58fa1ced-171a-4c00-97e8-5d70d442cc4b ) *created* an issue

Hibernate Search ( https://hibernate.atlassian.net/browse/HSEARCH?atlOrigin=eyJpIjoiMzgzZTIxYzc3YzVjNGM1MTgxODg5ZDRjNGUzMTEyNDgiLCJwIjoiaiJ9 ) / Task ( https://hibernate.atlassian.net/browse/HSEARCH-3975?atlOrigin=eyJpIjoiMzgzZTIxYzc3YzVjNGM1MTgxODg5ZDRjNGUzMTEyNDgiLCJwIjoiaiJ9 ) HSEARCH-3975 ( https://hibernate.atlassian.net/browse/HSEARCH-3975?atlOrigin=eyJpIjoiMzgzZTIxYzc3YzVjNGM1MTgxODg5ZDRjNGUzMTEyNDgiLCJwIjoiaiJ9 ) Expose scrolling operations through JPA/ORM queries ( https://hibernate.atlassian.net/browse/HSEARCH-3975?atlOrigin=eyJpIjoiMzgzZTIxYzc3YzVjNGM1MTgxODg5ZDRjNGUzMTEyNDgiLCJwIjoiaiJ9 )

Issue Type: Task Assignee: Unassigned Components: mapper-orm Created: 30/Jul/2020 09:04 AM Fix Versions: 6.0.0.Beta-backlog Priority: Major Reporter: Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A58fa1ced-171a-4c00-97e8-5d70d442cc4b )

> 
> * Implement scroll() and scroll(ScrollMode) in HibernateOrmSearchQueryAdapter
> , relying on SearchQuery#scroll(int) under the scene. * Only ScrollMode.FORWARD_ONLY
> will be supported.
> * We will need to decide on a page size. Let's use the same size as the
> loading fetch size, which should be accessible from org.hibernate.search.mapper.orm.search.loading.impl.MutableEntityLoadingOptions#getFetchSize
> .
> * Some internal windowing will probably be necessary. Just copy/paste the org.hibernate.search.elasticsearch.util.impl.Window
> class from Search 5 and adapt it. Do not forget to also copy the unit
> test, org.hibernate.search.elasticsearch.test.WindowTest.
> * See org.hibernate.search.query.hibernate.impl.ScrollableResultsImpl for
> an example of how it was done in Search 5 (may or may not be helpful).
> 
> * Add tests for scroll() and scroll(ScrollMode) in org.hibernate.search.integrationtest.mapper.orm.hibernateormapis.ToHibernateOrmIT
> : * Nominal case (create scroll, fetch some hits until all hits have been
> consumed, close).
> * Edge cases: not fetching any result (should work fine), fetching some
> results but not all of them (should work fine), trying to fetch more than
> the total hit count (should throw an exception).
> * Error cases: trying to scroll back, trying to call the get*(int) methods...
> 
> * Check that using any scroll mode other than ScrollMode.FORWARD_ONLY
> fails.
> * Test query.stream() too (it's based on scroll() ).
> 
> * Add tests for getResultStream() in org.hibernate.search.integrationtest.mapper.orm.hibernateormapis.ToJpaIT
> .
> 

( https://hibernate.atlassian.net/browse/HSEARCH-3975#add-comment?atlOrigin=eyJpIjoiMzgzZTIxYzc3YzVjNGM1MTgxODg5ZDRjNGUzMTEyNDgiLCJwIjoiaiJ9 ) Add Comment ( https://hibernate.atlassian.net/browse/HSEARCH-3975#add-comment?atlOrigin=eyJpIjoiMzgzZTIxYzc3YzVjNGM1MTgxODg5ZDRjNGUzMTEyNDgiLCJwIjoiaiJ9 )

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