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LoadEventHandler handler = ...;
EventListenerGroup<LoadEventListener> listenerGroup = ...;

listenerGroup.withListeners(
  (listeners) -> {
    if ( listeners == null ) {
      // short-circuit
      return handler.load( ... );
    }
    else if ( listeners.length == 1 ) {

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interface LoadEventHandler {
  /**
   * Perform the load
   */
	Object load(
		String entityName,
		Object id,
		LockMode lockMode,
		LoadType loadType,
		SessionImplementor session);

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card 0: PCH [HDA Intel PCH], device 0: ALC257 Analog [ALC257 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

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[   24.472153] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC257: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[   24.472155] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[   24.472156] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[   24.472157] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
[   24.472158] snd_hda_codec_realtek hdaudioC0D0:    inputs:
[   24.472159] snd_hda_codec_realtek hdaudioC0D0:      Mic=0x19
[   24.472160] snd_hda_codec_realtek hdaudioC0D0:      Internal Mic=0x12
...

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TableGroupImpl ... {
  private final TableReference primaryRef;
  private final BiFunction<TableReference,String,TableReferenceJoin> joinCreator;

	private List<TableReferenceJoin> tableJoins;
  ...

  @Override
	public TableReference resolveTableReference(String tableExpression) {
    if ( primaryRef... ) {

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	@Test
	public void testQueryConcurrency(SessionFactoryScope scope) throws InterruptedException {
		final int numberOfIterations = 40;
		final int numberOfForks = 5;

		final ExecutorService executor = Executors.newFixedThreadPool( 5 );

		final List<Future<String>> futures = CollectionHelper.arrayList( numberOfIterations * numberOfForks );

		try {

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	@Test
	public void testCustomProviderPassingIntegrationOverrides() {
		PersistenceProvider provider = new HibernatePersistence() {
			@Override
			public EntityManagerFactory createContainerEntityManagerFactory(PersistenceUnitInfo info, Map properties) {
				properties.putAll( ConnectionProviderBuilder.getConnectionProviderProperties() );

				return super.createContainerEntityManagerFactory( info, properties );
			}
		};

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              Enhanced                                Enhanced           
              allow_enhancement_as_proxy=true         allow_enhancement_as_proxy=false  Non-enhanced  

Session#load: returns uninitialized, enhanced entity  return enhanced entity that       return entity 
(entity/proxy (per HHH-11147)                         implements HibernateProxy         that implements 
not in PC                                                                               HibernateProxy
yet)                                                                              

LazyToOne:

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              Enhanced                                Enhanced           
              allow_enhancement_as_proxy=true         allow_enhancement_as_proxy=false  Non-enhanced  

Session#load: returns uninitialized, enhanced entity  return enhanced entity that       return entity 
(entity/proxy (per HHH-11147)                         implements HibernateProxy         that implements 
not in PC                                                                               HibernateProxy
yet)                                                                              

LazyToOne:

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[sebersole@t460p hibernate-core]$ gradlew -m release
:release SKIPPED
:hibernate-core:antlr SKIPPED
:hibernate-core:xjc SKIPPED
:hibernate-core:compileJava SKIPPED
:hibernate-core:processResources SKIPPED
:hibernate-core:classes SKIPPED
:hibernate-core:osgiClasses SKIPPED
:hibernate-core:jar SKIPPED