import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
/**
 * fixes the warning (Encountered a deprecated javax.persistence.spi.PersistenceProvider [org.hibernate.ejb
 * .HibernatePersistence]; use [org.hibernate.jpa.HibernatePersistenceProvider] instead.)
 *
 * must be called before getting the EntityManagerFactory
 */
private static void fixDeprecatedHibernateWarning() {
    PersistenceProviderResolverHolder.setPersistenceProviderResolver(new PersistenceProviderResolver() {
        private final List<PersistenceProvider> providers_ =
                Arrays.asList(new PersistenceProvider[]{new HibernatePersistenceProvider()});

        @Override
        public List<PersistenceProvider> getPersistenceProviders() {
            return providers_;
        }

        @Override
        public void clearCachedProviders() {

        }
    });
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
private void guessDelegate() {
	// https://issues.apache.org/jira/browse/SIRONA-44
	// https://github.com/javamelody/javamelody/issues/460
	final List<PersistenceProvider> persistenceProviders = PersistenceProviderResolverHolder
			.getPersistenceProviderResolver().getPersistenceProviders();
	for (final PersistenceProvider persistenceProvider : persistenceProviders) {
		if (!getClass().isInstance(persistenceProvider)) {
			delegate = persistenceProvider;
			break;
		}
	}
	if (delegate == null) {
		for (final String provider : PROVIDERS) {
			try {
				delegate = newPersistence(provider);
				break;
			} catch (final Throwable th2) { // NOPMD
				continue;
			}
		}
		if (delegate == null) {
			throw new IllegalStateException(
					new ClassNotFoundException("Can't find a delegate"));
		}
	}
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
@Deployment
public static WebArchive deploy()
{
    // set the dummy PersistenceProviderResolver which creates our DummyEntityManagerFactory
    PersistenceProviderResolverHolder.setPersistenceProviderResolver(new TestPersistenceProviderResolver());

    JavaArchive testJar = ShrinkWrap.create(JavaArchive.class, "unitDefinitionTest.jar")
            .addPackage(ArchiveUtils.SHARED_PACKAGE)
            .addClass(PersistenceConfigurationProviderTest.class)
            .addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml");

    return ShrinkWrap.create(WebArchive.class)
            .addAsLibraries(ArchiveUtils.getDeltaSpikeCoreAndJpaArchive())
            .addAsLibraries(testJar)
            .addAsWebInfResource(ArchiveUtils.getBeansXml(), "beans.xml");
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
@Deployment
public static WebArchive deploy()
{
    // set the dummy PersistenceProviderResolver which creates our DummyEntityManagerFactory
    PersistenceProviderResolverHolder.setPersistenceProviderResolver(new TestPersistenceProviderResolver());

    JavaArchive testJar = ShrinkWrap.create(JavaArchive.class, "unitDefinitionTest.jar")
            .addPackage(ArchiveUtils.SHARED_PACKAGE)
            .addPackage(EntityManagerFactoryProducerTest.class.getPackage().getName())
            .addAsManifestResource(EmptyAsset.INSTANCE, "beans.xml")
            .addAsResource(new StringAsset(TestPersistenceProviderResolver.class.getName()),
                    "META-INF/services/javax.persistence.spi.PersistenceProviderResolver");

    return ShrinkWrap.create(WebArchive.class)
            .addAsLibraries(ArchiveUtils.getDeltaSpikeCoreAndJpaArchive())
            .addAsLibraries(testJar)
            .addAsWebInfResource(ArchiveUtils.getBeansXml(), "beans.xml");
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
@Override
public void start(BundleContext context) throws Exception {
	emfResolver = new EMFBuilderServiceResolver(context);
	
	tracker = new ServiceTracker<PersistenceProvider, PersistenceProvider>(context, 
			PersistenceProvider.class, null);
	tracker.open();
	
	PersistenceProviderResolverHolder.setPersistenceProviderResolver(this);
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
private PersistenceProvider getJpaPersistence() {
	final List<PersistenceProvider> persistenceProviders = PersistenceProviderResolverHolder
			.getPersistenceProviderResolver().getPersistenceProviders();
	for (final PersistenceProvider persistenceProvider : persistenceProviders) {
		if (persistenceProvider instanceof JpaPersistence) {
			return persistenceProvider;
		}
	}
	throw new IllegalStateException("JpaPersistence not found in PersistenceProviders");
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
private JPA() {
	List<PersistenceProvider> providers = PersistenceProviderResolverHolder.getPersistenceProviderResolver().getPersistenceProviders();
	if (providers != null) {
		String providerClass = providers.get(0).getClass().getCanonicalName();
		if (providerClass.equals(HIBERNATE_PERSISTENCE) || providerClass.equals(HIBERNATE_JPA_PERSISTENCE)) {
			cacheableHint = "org.hibernate.cacheable";
		} else if (providerClass.equals(ECLIPSE_PERSISTENCE)) {
			cacheableHint = "eclipselink.query-results-cache";
		} else if (providerClass.equals(OPENJPA_PERSISTENCE)) {
			cacheableHint = "openjpa.QueryCache";
		}
	}
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
@Override
public void stop(BundleContext context) throws Exception {
	PersistenceProviderResolverHolder.setPersistenceProviderResolver(null);
	tracker.close();
	emfResolver.close();
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
protected static List<PersistenceProvider> getProviders() {
    return PersistenceProviderResolverHolder
            .getPersistenceProviderResolver()
            .getPersistenceProviders();
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
@Produces
@ApplicationScoped
public PersistenceProvider getPersistenceProvider() {
    return PersistenceProviderResolverHolder.getPersistenceProviderResolver().getPersistenceProviders().get(0);
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
protected List<PersistenceProvider> getProviders() {
	return PersistenceProviderResolverHolder.getPersistenceProviderResolver().getPersistenceProviders();
}
 

import javax.persistence.spi.PersistenceProviderResolverHolder; //导入依赖的package包/类
@BeforeClass
public static void setupClass() {
	System.setProperty(ECLIPSELINK_PERSISTENCEXML, "META-INF/eclipselink-plainjpa-persistence.xml");
	PersistenceProviderResolverHolder.setPersistenceProviderResolver(new EclipseLinkOnlyPersistenceProviderResolve());
	emf = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
}