Class PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver

java.lang.Object

jakarta.persistence.spi.PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver

All Implemented Interfaces:

PersistenceProviderResolver

Enclosing class:

PersistenceProviderResolverHolder

private static class PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver
extends Object
implements PersistenceProviderResolver

Default provider resolver class to use when none is explicitly set.

Uses service loading mechanism as described in the Jakarta Persistence specification. A ServiceLoader.load() call is made with the current context classloader to find the service provider files on the classpath.

Since:

2.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private class	PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.CacheKey	Key used for cached persistence providers.
private static interface	PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.CacheKeyReference	The common interface to get a CacheKey implemented by LoaderReference and PersistenceProviderReference.
private class	PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.LoaderReference	References to class loaders are weak references, so that they can be garbage collected when nobody else is using them.
private class	PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.PersistenceProviderReference	References to persistence provider are soft references so that they can be garbage collected when they have no hard references.

Field Summary

Fields

Modifier and Type	Field	Description
private Logger	logger
private static final String	LOGGER_SUBSYSTEM
private HashMap<PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.CacheKey, PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.PersistenceProviderReference>	providers	Cached list of available providers cached by CacheKey to ensure there is not potential for provider visibility issues.
private static final ReferenceQueue	referenceQueue	Queue for reference objects referring to class loaders or persistence providers.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	DefaultPersistenceProviderResolver()

Method Summary

Modifier and Type	Method	Description
void	clearCachedProviders()	Clear all cached providers
private static ClassLoader	getContextClassLoader()	Wraps Thread.currentThread().getContextClassLoader() into a doPrivileged block if security manager is present
List<PersistenceProvider>	getPersistenceProviders()	Returns a list of the persistence provider implementations available in the runtime environment.
private void	log(Level level, String message)
private void	processQueue()	Remove garbage collected cache keys invalid input: '&' providers.

Methods inherited from class Object

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

Field Details

providers

private volatile HashMap<PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.CacheKey, PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.PersistenceProviderReference> providers

Cached list of available providers cached by CacheKey to ensure there is not potential for provider visibility issues.

referenceQueue

private static final ReferenceQueue referenceQueue

Queue for reference objects referring to class loaders or persistence providers.

LOGGER_SUBSYSTEM

private static final String LOGGER_SUBSYSTEM

See Also:

• Constant Field Values

logger

private Logger logger

Constructor Details

DefaultPersistenceProviderResolver

private DefaultPersistenceProviderResolver()

Method Details

getPersistenceProviders

public List<PersistenceProvider> getPersistenceProviders()

Description copied from interface: PersistenceProviderResolver

Returns a list of the persistence provider implementations available in the runtime environment.

Specified by:

getPersistenceProviders in interface PersistenceProviderResolver

Returns:

list of the persistence providers available in the environment

processQueue

private void processQueue()

Remove garbage collected cache keys invalid input: '&' providers.

getContextClassLoader

private static ClassLoader getContextClassLoader()

Wraps Thread.currentThread().getContextClassLoader() into a doPrivileged block if security manager is present

log

private void log(Level level,
 String message)

clearCachedProviders

public void clearCachedProviders()

Clear all cached providers

Specified by:

clearCachedProviders in interface PersistenceProviderResolver