org.hibernate.reactive.event.impl

Class DefaultReactiveLoadEventListener

java.lang.Object

org.hibernate.reactive.event.impl.DefaultReactiveLoadEventListener

All Implemented Interfaces:

java.io.Serializable, org.hibernate.event.spi.LoadEventListener, ReactiveLoadEventListener

public class DefaultReactiveLoadEventListener
extends java.lang.Object
implements org.hibernate.event.spi.LoadEventListener, ReactiveLoadEventListener

A reactive DefaultLoadEventListener.

Note that sometimes Hibernate ORM calls SessionImpl.internalLoad(String, Serializable, boolean, boolean) and LoadEventListener.onLoad(LoadEvent, LoadType) is called. We only support this case when loading generates a proxy.

The return value of the private methods loading the entity is a proxy or a CompletionStage. The CompletionStage only happens when we query the db and a proxy is not created. If LoadEventListener.onLoad(LoadEvent, LoadType) is called, we cannot get the entity loaded from the db without blocking the request and therefore we aren't going to support this case for now.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.hibernate.event.spi.LoadEventListener

org.hibernate.event.spi.LoadEventListener.LoadType

Field Summary

Fields inherited from interface org.hibernate.event.spi.LoadEventListener

GET, IMMEDIATE_LOAD, INTERNAL_LOAD_EAGER, INTERNAL_LOAD_LAZY, INTERNAL_LOAD_NULLABLE, LOAD, RELOAD

Constructor Summary

Constructors

Constructor and Description
DefaultReactiveLoadEventListener()

Method Summary

Modifier and Type	Method and Description
protected org.hibernate.persister.entity.EntityPersister	getPersister(org.hibernate.event.spi.LoadEvent event)
protected java.util.concurrent.CompletionStage<java.lang.Object>	loadFromDatasource(org.hibernate.event.spi.LoadEvent event, org.hibernate.persister.entity.EntityPersister persister) Performs the process of loading an entity from the configured underlying datasource.
void	onLoad(org.hibernate.event.spi.LoadEvent event, org.hibernate.event.spi.LoadEventListener.LoadType loadType) This method is not reactive but we expect it to be called only when a proxy can be returned.
java.util.concurrent.CompletionStage<java.lang.Void>	reactiveOnLoad(org.hibernate.event.spi.LoadEvent event, org.hibernate.event.spi.LoadEventListener.LoadType loadType) Handle the given load event.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultReactiveLoadEventListener

public DefaultReactiveLoadEventListener()

Method Detail

onLoad

public void onLoad(org.hibernate.event.spi.LoadEvent event,
                   org.hibernate.event.spi.LoadEventListener.LoadType loadType)
            throws org.hibernate.HibernateException

This method is not reactive but we expect it to be called only when a proxy can be returned.

In particular, it should be called only by SessionImpl.internalLoad(String, Serializable, boolean, boolean).

Specified by:

onLoad in interface org.hibernate.event.spi.LoadEventListener

Throws:

java.lang.UnsupportedOperationException - if the entity loaded is not a proxy

UnexpectedAccessToTheDatabase - if it needs to load the entity from the db

org.hibernate.HibernateException

See Also:

LoadEventListener.onLoad(LoadEvent, LoadType)

reactiveOnLoad

public java.util.concurrent.CompletionStage<java.lang.Void> reactiveOnLoad(org.hibernate.event.spi.LoadEvent event,
                                                                           org.hibernate.event.spi.LoadEventListener.LoadType loadType)
                                                                    throws org.hibernate.HibernateException

Handle the given load event.

Specified by:

reactiveOnLoad in interface ReactiveLoadEventListener

Parameters:

event - The load event to be handled.

Throws:

org.hibernate.HibernateException

getPersister

protected org.hibernate.persister.entity.EntityPersister getPersister(org.hibernate.event.spi.LoadEvent event)

loadFromDatasource

protected java.util.concurrent.CompletionStage<java.lang.Object> loadFromDatasource(org.hibernate.event.spi.LoadEvent event,
                                                                                    org.hibernate.persister.entity.EntityPersister persister)

Performs the process of loading an entity from the configured underlying datasource.

Parameters:

event - The load event

persister - The persister for the entity being requested for load

Returns:

The object loaded from the datasource, or null if not found.