Package com.atlassian.confluence.impl.content.render.prefetch.hibernate

Class HibernatePrefetchHelper

java.lang.Object

com.atlassian.confluence.impl.content.render.prefetch.hibernate.HibernatePrefetchHelper

public class HibernatePrefetchHelper
extends Object

Since:

5.10

Constructor Summary

Constructors

Constructor	Description
HibernatePrefetchHelper(org.springframework.orm.hibernate5.HibernateOperations hibernate)

Method Summary

Modifier and Type	Method	Description
static <I,O> Collection<O>	partitionedQuery(Collection<I> inputItems, int partitionSize, Function<Collection<I>,Collection<O>> query)	A convenience method for running a query against a large set of inputs.
<T> Collection<T>	prefetchEntitiesById(String idPropertyName, Collection<?> ids, Class<T> entityType)	Attempts to efficiently load Hibernate entities of a given type given a collection od IDs.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HibernatePrefetchHelper

public HibernatePrefetchHelper(org.springframework.orm.hibernate5.HibernateOperations hibernate)

Method Detail

prefetchEntitiesById

public <T> Collection<T> prefetchEntitiesById(String idPropertyName,
                                              Collection<?> ids,
                                              Class<T> entityType)

Attempts to efficiently load Hibernate entities of a given type given a collection od IDs.

Note that if the entities are already present in the Hibernate L2 cache, then this query will be doing unnecessary work, and the cached entities could be fetched by net.sf.hibernate.Session#get(Class, Serializable). However, there's no way to make this determination without getting up to our elbows in Hibernate's innards, which probably isn't worth it.

Returns:

the number of entities that were prefetched

partitionedQuery

public static <I,O> Collection<O> partitionedQuery(Collection<I> inputItems,
                                                         int partitionSize,
                                                         Function<Collection<I>,Collection<O>> query)

A convenience method for running a query against a large set of inputs. The inputs are partitioned up and the query is executed for each partition. The results are then recombined into a single collection.