spring AbstractEntityManagerFactoryBean 源码
spring AbstractEntityManagerFactoryBean 代码
文件路径：/spring-orm/src/main/java/org/springframework/orm/jpa/AbstractEntityManagerFactoryBean.java
/*
* Copyright 2002-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.orm.jpa;
import java.io.IOException;
import java.io.NotSerializableException;
import java.io.ObjectInputStream;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.function.Consumer;
import javax.sql.DataSource;
import jakarta.persistence.EntityManager;
import jakarta.persistence.EntityManagerFactory;
import jakarta.persistence.PersistenceException;
import jakarta.persistence.Query;
import jakarta.persistence.SynchronizationType;
import jakarta.persistence.spi.PersistenceProvider;
import jakarta.persistence.spi.PersistenceUnitInfo;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.task.AsyncTaskExecutor;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.support.PersistenceExceptionTranslator;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.CollectionUtils;
/**
* Abstract {@link org.springframework.beans.factory.FactoryBean} that creates
* a local JPA {@link jakarta.persistence.EntityManagerFactory} instance within
* a Spring application context.
*
* <p>Encapsulates the common functionality between the different JPA bootstrap
* contracts (standalone as well as container).
*
* <p>Implements support for standard JPA configuration conventions as well as
* Spring's customizable {@link JpaVendorAdapter} mechanism, and controls the
* EntityManagerFactory's lifecycle.
*
* <p>This class also implements the
* {@link org.springframework.dao.support.PersistenceExceptionTranslator}
* interface, as autodetected by Spring's
* {@link org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor},
* for AOP-based translation of native exceptions to Spring DataAccessExceptions.
* Hence, the presence of e.g. LocalEntityManagerFactoryBean automatically enables
* a PersistenceExceptionTranslationPostProcessor to translate JPA exceptions.
*
* @author Juergen Hoeller
* @author Rod Johnson
* @since 2.0
* @see LocalEntityManagerFactoryBean
* @see LocalContainerEntityManagerFactoryBean
*/
@SuppressWarnings("serial")
public abstract class AbstractEntityManagerFactoryBean implements
FactoryBean<EntityManagerFactory>, BeanClassLoaderAware, BeanFactoryAware, BeanNameAware,
InitializingBean, DisposableBean, EntityManagerFactoryInfo, PersistenceExceptionTranslator, Serializable {
/** Logger available to subclasses. */
protected final Log logger = LogFactory.getLog(getClass());
@Nullable
private PersistenceProvider persistenceProvider;
@Nullable
private String persistenceUnitName;
private final Map<String, Object> jpaPropertyMap = new HashMap<>();
@Nullable
private Class<? extends EntityManagerFactory> entityManagerFactoryInterface;
@Nullable
private Class<? extends EntityManager> entityManagerInterface;
@Nullable
private JpaDialect jpaDialect;
@Nullable
private JpaVendorAdapter jpaVendorAdapter;
@Nullable
private Consumer<EntityManager> entityManagerInitializer;
@Nullable
private AsyncTaskExecutor bootstrapExecutor;
private ClassLoader beanClassLoader = getClass().getClassLoader();
@Nullable
private BeanFactory beanFactory;
@Nullable
private String beanName;
/** Raw EntityManagerFactory as returned by the PersistenceProvider. */
@Nullable
private EntityManagerFactory nativeEntityManagerFactory;
/** Future for lazily initializing raw target EntityManagerFactory. */
@Nullable
private Future<EntityManagerFactory> nativeEntityManagerFactoryFuture;
/** Exposed client-level EntityManagerFactory proxy. */
@Nullable
private EntityManagerFactory entityManagerFactory;
/**
* Set the PersistenceProvider implementation class to use for creating the
* EntityManagerFactory. If not specified, the persistence provider will be
* taken from the JpaVendorAdapter (if any) or retrieved through scanning
* (as far as possible).
* @see JpaVendorAdapter#getPersistenceProvider()
* @see jakarta.persistence.spi.PersistenceProvider
* @see jakarta.persistence.Persistence
*/
public void setPersistenceProviderClass(Class<? extends PersistenceProvider> persistenceProviderClass) {
this.persistenceProvider = BeanUtils.instantiateClass(persistenceProviderClass);
}
/**
* Set the PersistenceProvider instance to use for creating the
* EntityManagerFactory. If not specified, the persistence provider
* will be taken from the JpaVendorAdapter (if any) or determined
* by the persistence unit deployment descriptor (as far as possible).
* @see JpaVendorAdapter#getPersistenceProvider()
* @see jakarta.persistence.spi.PersistenceProvider
* @see jakarta.persistence.Persistence
*/
public void setPersistenceProvider(@Nullable PersistenceProvider persistenceProvider) {
this.persistenceProvider = persistenceProvider;
}
@Override
@Nullable
public PersistenceProvider getPersistenceProvider() {
return this.persistenceProvider;
}
/**
* Specify the name of the EntityManagerFactory configuration.
* <p>Default is none, indicating the default EntityManagerFactory
* configuration. The persistence provider will throw an exception if
* ambiguous EntityManager configurations are found.
* @see jakarta.persistence.Persistence#createEntityManagerFactory(String)
*/
public void setPersistenceUnitName(@Nullable String persistenceUnitName) {
this.persistenceUnitName = persistenceUnitName;
}
@Override
@Nullable
public String getPersistenceUnitName() {
return this.persistenceUnitName;
}
/**
* Specify JPA properties, to be passed into
* {@code Persistence.createEntityManagerFactory} (if any).
* <p>Can be populated with a String "value" (parsed via PropertiesEditor) or a
* "props" element in XML bean definitions.
* @see jakarta.persistence.Persistence#createEntityManagerFactory(String, Map)
* @see jakarta.persistence.spi.PersistenceProvider#createContainerEntityManagerFactory(PersistenceUnitInfo, Map)
*/
public void setJpaProperties(Properties jpaProperties) {
CollectionUtils.mergePropertiesIntoMap(jpaProperties, this.jpaPropertyMap);
}
/**
* Specify JPA properties as a Map, to be passed into
* {@code Persistence.createEntityManagerFactory} (if any).
* <p>Can be populated with a "map" or "props" element in XML bean definitions.
* @see jakarta.persistence.Persistence#createEntityManagerFactory(String, Map)
* @see jakarta.persistence.spi.PersistenceProvider#createContainerEntityManagerFactory(PersistenceUnitInfo, Map)
*/
public void setJpaPropertyMap(@Nullable Map<String, ?> jpaProperties) {
if (jpaProperties != null) {
this.jpaPropertyMap.putAll(jpaProperties);
}
}
/**
* Allow {@code Map} access to the JPA properties to be passed to the persistence
* provider, with the option to add or override specific entries.
* <p>Useful for specifying entries directly, for example via
* {@code jpaPropertyMap[myKey]}.
*/
public Map<String, Object> getJpaPropertyMap() {
return this.jpaPropertyMap;
}
/**
* Specify the (potentially vendor-specific) EntityManagerFactory interface
* that this EntityManagerFactory proxy is supposed to implement.
* <p>The default will be taken from the specific JpaVendorAdapter, if any,
* or set to the standard {@code jakarta.persistence.EntityManagerFactory}
* interface else.
* @see JpaVendorAdapter#getEntityManagerFactoryInterface()
*/
public void setEntityManagerFactoryInterface(Class<? extends EntityManagerFactory> emfInterface) {
this.entityManagerFactoryInterface = emfInterface;
}
/**
* Specify the (potentially vendor-specific) EntityManager interface
* that this factory's EntityManagers are supposed to implement.
* <p>The default will be taken from the specific JpaVendorAdapter, if any,
* or set to the standard {@code jakarta.persistence.EntityManager}
* interface else.
* @see JpaVendorAdapter#getEntityManagerInterface()
* @see EntityManagerFactoryInfo#getEntityManagerInterface()
*/
public void setEntityManagerInterface(@Nullable Class<? extends EntityManager> emInterface) {
this.entityManagerInterface = emInterface;
}
@Override
@Nullable
public Class<? extends EntityManager> getEntityManagerInterface() {
return this.entityManagerInterface;
}
/**
* Specify the vendor-specific JpaDialect implementation to associate with
* this EntityManagerFactory. This will be exposed through the
* EntityManagerFactoryInfo interface, to be picked up as default dialect by
* accessors that intend to use JpaDialect functionality.
* @see EntityManagerFactoryInfo#getJpaDialect()
*/
public void setJpaDialect(@Nullable JpaDialect jpaDialect) {
this.jpaDialect = jpaDialect;
}
@Override
@Nullable
public JpaDialect getJpaDialect() {
return this.jpaDialect;
}
/**
* Specify the JpaVendorAdapter implementation for the desired JPA provider,
* if any. This will initialize appropriate defaults for the given provider,
* such as persistence provider class and JpaDialect, unless locally
* overridden in this FactoryBean.
*/
public void setJpaVendorAdapter(@Nullable JpaVendorAdapter jpaVendorAdapter) {
this.jpaVendorAdapter = jpaVendorAdapter;
}
/**
* Return the JpaVendorAdapter implementation for this EntityManagerFactory,
* or {@code null} if not known.
*/
@Nullable
public JpaVendorAdapter getJpaVendorAdapter() {
return this.jpaVendorAdapter;
}
/**
* Specify a callback for customizing every {@code EntityManager} created
* by the exposed {@code EntityManagerFactory}.
* <p>This is an alternative to a {@code JpaVendorAdapter}-level
* {@code postProcessEntityManager} implementation, enabling convenient
* customizations for application purposes, e.g. setting Hibernate filters.
* @since 5.3
* @see JpaVendorAdapter#postProcessEntityManager
* @see JpaTransactionManager#setEntityManagerInitializer
*/
public void setEntityManagerInitializer(Consumer<EntityManager> entityManagerInitializer) {
this.entityManagerInitializer = entityManagerInitializer;
}
/**
* Specify an asynchronous executor for background bootstrapping,
* e.g. a {@link org.springframework.core.task.SimpleAsyncTaskExecutor}.
* <p>{@code EntityManagerFactory} initialization will then switch into background
* bootstrap mode, with a {@code EntityManagerFactory} proxy immediately returned for
* injection purposes instead of waiting for the JPA provider's bootstrapping to complete.
* However, note that the first actual call to a {@code EntityManagerFactory} method will
* then block until the JPA provider's bootstrapping completed, if not ready by then.
* For maximum benefit, make sure to avoid early {@code EntityManagerFactory} calls
* in init methods of related beans, even for metadata introspection purposes.
* @since 4.3
*/
public void setBootstrapExecutor(@Nullable AsyncTaskExecutor bootstrapExecutor) {
this.bootstrapExecutor = bootstrapExecutor;
}
/**
* Return the asynchronous executor for background bootstrapping, if any.
* @since 4.3
*/
@Nullable
public AsyncTaskExecutor getBootstrapExecutor() {
return this.bootstrapExecutor;
}
@Override
public void setBeanClassLoader(ClassLoader classLoader) {
this.beanClassLoader = classLoader;
}
@Override
public ClassLoader getBeanClassLoader() {
return this.beanClassLoader;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
public void setBeanName(String name) {
this.beanName = name;
}
@Override
public void afterPropertiesSet() throws PersistenceException {
JpaVendorAdapter jpaVendorAdapter = getJpaVendorAdapter();
if (jpaVendorAdapter != null) {
if (this.persistenceProvider == null) {
this.persistenceProvider = jpaVendorAdapter.getPersistenceProvider();
}
PersistenceUnitInfo pui = getPersistenceUnitInfo();
Map<String, ?> vendorPropertyMap = (pui != null ? jpaVendorAdapter.getJpaPropertyMap(pui) :
jpaVendorAdapter.getJpaPropertyMap());
if (!CollectionUtils.isEmpty(vendorPropertyMap)) {
vendorPropertyMap.forEach((key, value) -> {
if (!this.jpaPropertyMap.containsKey(key)) {
this.jpaPropertyMap.put(key, value);
}
});
}
if (this.entityManagerFactoryInterface == null) {
this.entityManagerFactoryInterface = jpaVendorAdapter.getEntityManagerFactoryInterface();
if (!ClassUtils.isVisible(this.entityManagerFactoryInterface, this.beanClassLoader)) {
this.entityManagerFactoryInterface = EntityManagerFactory.class;
}
}
if (this.entityManagerInterface == null) {
this.entityManagerInterface = jpaVendorAdapter.getEntityManagerInterface();
if (!ClassUtils.isVisible(this.entityManagerInterface, this.beanClassLoader)) {
this.entityManagerInterface = EntityManager.class;
}
}
if (this.jpaDialect == null) {
this.jpaDialect = jpaVendorAdapter.getJpaDialect();
}
}
AsyncTaskExecutor bootstrapExecutor = getBootstrapExecutor();
if (bootstrapExecutor != null) {
this.nativeEntityManagerFactoryFuture = bootstrapExecutor.submit(this::buildNativeEntityManagerFactory);
}
else {
this.nativeEntityManagerFactory = buildNativeEntityManagerFactory();
}
// Wrap the EntityManagerFactory in a factory implementing all its interfaces.
// This allows interception of createEntityManager methods to return an
// application-managed EntityManager proxy that automatically joins
// existing transactions.
this.entityManagerFactory = createEntityManagerFactoryProxy(this.nativeEntityManagerFactory);
}
private EntityManagerFactory buildNativeEntityManagerFactory() {
EntityManagerFactory emf;
try {
emf = createNativeEntityManagerFactory();
}
catch (PersistenceException ex) {
if (ex.getClass() == PersistenceException.class) {
// Plain PersistenceException wrapper for underlying exception?
// Make sure the nested exception message is properly exposed,
// along the lines of Spring's NestedRuntimeException.getMessage()
Throwable cause = ex.getCause();
if (cause != null) {
String message = ex.getMessage();
String causeString = cause.toString();
if (!message.endsWith(causeString)) {
ex = new PersistenceException(message + "; nested exception is " + causeString, cause);
}
}
}
if (logger.isErrorEnabled()) {
logger.error("Failed to initialize JPA EntityManagerFactory: " + ex.getMessage());
}
throw ex;
}
JpaVendorAdapter jpaVendorAdapter = getJpaVendorAdapter();
if (jpaVendorAdapter != null) {
jpaVendorAdapter.postProcessEntityManagerFactory(emf);
}
if (logger.isInfoEnabled()) {
logger.info("Initialized JPA EntityManagerFactory for persistence unit '" + getPersistenceUnitName() + "'");
}
return emf;
}
/**
* Create a proxy for the given {@link EntityManagerFactory}. We do this to be able to
* return a transaction-aware proxy for an application-managed {@link EntityManager}.
* @param emf the EntityManagerFactory as returned by the persistence provider,
* if initialized already
* @return the EntityManagerFactory proxy
*/
protected EntityManagerFactory createEntityManagerFactoryProxy(@Nullable EntityManagerFactory emf) {
Set<Class<?>> ifcs = new LinkedHashSet<>();
Class<?> entityManagerFactoryInterface = this.entityManagerFactoryInterface;
if (entityManagerFactoryInterface != null) {
ifcs.add(entityManagerFactoryInterface);
}
else if (emf != null) {
ifcs.addAll(ClassUtils.getAllInterfacesForClassAsSet(emf.getClass(), this.beanClassLoader));
}
else {
ifcs.add(EntityManagerFactory.class);
}
ifcs.add(EntityManagerFactoryInfo.class);
try {
return (EntityManagerFactory) Proxy.newProxyInstance(this.beanClassLoader,
ClassUtils.toClassArray(ifcs), new ManagedEntityManagerFactoryInvocationHandler(this));
}
catch (IllegalArgumentException ex) {
if (entityManagerFactoryInterface != null) {
throw new IllegalStateException("EntityManagerFactory interface [" + entityManagerFactoryInterface +
"] seems to conflict with Spring's EntityManagerFactoryInfo mixin - consider resetting the "+
"'entityManagerFactoryInterface' property to plain [jakarta.persistence.EntityManagerFactory]", ex);
}
else {
throw new IllegalStateException("Conflicting EntityManagerFactory interfaces - " +
"consider specifying the 'jpaVendorAdapter' or 'entityManagerFactoryInterface' property " +
"to select a specific EntityManagerFactory interface to proceed with", ex);
}
}
}
/**
* Delegate an incoming invocation from the proxy, dispatching to EntityManagerFactoryInfo
* or the native EntityManagerFactory accordingly.
*/
Object invokeProxyMethod(Method method, @Nullable Object[] args) throws Throwable {
if (method.getDeclaringClass().isAssignableFrom(EntityManagerFactoryInfo.class)) {
return method.invoke(this, args);
}
else if (method.getName().equals("createEntityManager") && args != null && args.length > 0 &&
args[0] == SynchronizationType.SYNCHRONIZED) {
// JPA 2.1's createEntityManager(SynchronizationType, Map)
// Redirect to plain createEntityManager and add synchronization semantics through Spring proxy
EntityManager rawEntityManager = (args.length > 1 ?
getNativeEntityManagerFactory().createEntityManager((Map<?, ?>) args[1]) :
getNativeEntityManagerFactory().createEntityManager());
postProcessEntityManager(rawEntityManager);
return ExtendedEntityManagerCreator.createApplicationManagedEntityManager(rawEntityManager, this, true);
}
// Look for Query arguments, primarily JPA 2.1's addNamedQuery(String, Query)
if (args != null) {
for (int i = 0; i < args.length; i++) {
Object arg = args[i];
if (arg instanceof Query query && Proxy.isProxyClass(arg.getClass())) {
// Assumably a Spring-generated proxy from SharedEntityManagerCreator:
// since we're passing it back to the native EntityManagerFactory,
// let's unwrap it to the original Query object from the provider.
try {
args[i] = query.unwrap(null);
}
catch (RuntimeException ex) {
// Ignore - simply proceed with given Query object then
}
}
}
}
// Standard delegation to the native factory, just post-processing EntityManager return values
Object retVal = method.invoke(getNativeEntityManagerFactory(), args);
if (retVal instanceof EntityManager rawEntityManager) {
// Any other createEntityManager variant - expecting non-synchronized semantics
postProcessEntityManager(rawEntityManager);
retVal = ExtendedEntityManagerCreator.createApplicationManagedEntityManager(rawEntityManager, this, false);
}
return retVal;
}
/**
* Subclasses must implement this method to create the EntityManagerFactory
* that will be returned by the {@code getObject()} method.
* @return the EntityManagerFactory instance returned by this FactoryBean
* @throws PersistenceException if the EntityManager cannot be created
*/
protected abstract EntityManagerFactory createNativeEntityManagerFactory() throws PersistenceException;
/**
* Implementation of the PersistenceExceptionTranslator interface, as
* autodetected by Spring's PersistenceExceptionTranslationPostProcessor.
* <p>Uses the dialect's conversion if possible; otherwise falls back to
* standard JPA exception conversion.
* @see org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor
* @see JpaDialect#translateExceptionIfPossible
* @see EntityManagerFactoryUtils#convertJpaAccessExceptionIfPossible
*/
@Override
@Nullable
public DataAccessException translateExceptionIfPossible(RuntimeException ex) {
JpaDialect jpaDialect = getJpaDialect();
return (jpaDialect != null ? jpaDialect.translateExceptionIfPossible(ex) :
EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(ex));
}
@Override
public EntityManagerFactory getNativeEntityManagerFactory() {
if (this.nativeEntityManagerFactory != null) {
return this.nativeEntityManagerFactory;
}
else {
Assert.state(this.nativeEntityManagerFactoryFuture != null, "No native EntityManagerFactory available");
try {
return this.nativeEntityManagerFactoryFuture.get();
}
catch (InterruptedException ex) {
Thread.currentThread().interrupt();
throw new IllegalStateException("Interrupted during initialization of native EntityManagerFactory", ex);
}
catch (ExecutionException ex) {
Throwable cause = ex.getCause();
if (cause instanceof PersistenceException persistenceException) {
// Rethrow a provider configuration exception (possibly with a nested cause) directly
throw persistenceException;
}
throw new IllegalStateException("Failed to asynchronously initialize native EntityManagerFactory: " +
ex.getMessage(), cause);
}
}
}
@Override
public EntityManager createNativeEntityManager(@Nullable Map<?, ?> properties) {
EntityManager rawEntityManager = (!CollectionUtils.isEmpty(properties) ?
getNativeEntityManagerFactory().createEntityManager(properties) :
getNativeEntityManagerFactory().createEntityManager());
postProcessEntityManager(rawEntityManager);
return rawEntityManager;
}
/**
* Optional callback for post-processing the native EntityManager
* before active use.
* <p>The default implementation delegates to
* {@link JpaVendorAdapter#postProcessEntityManager}, if available.
* @param rawEntityManager the EntityManager to post-process
* @since 5.3
* @see #createNativeEntityManager
* @see JpaVendorAdapter#postProcessEntityManager
*/
protected void postProcessEntityManager(EntityManager rawEntityManager) {
JpaVendorAdapter jpaVendorAdapter = getJpaVendorAdapter();
if (jpaVendorAdapter != null) {
jpaVendorAdapter.postProcessEntityManager(rawEntityManager);
}
Consumer<EntityManager> customizer = this.entityManagerInitializer;
if (customizer != null) {
customizer.accept(rawEntityManager);
}
}
@Override
@Nullable
public PersistenceUnitInfo getPersistenceUnitInfo() {
return null;
}
@Override
@Nullable
public DataSource getDataSource() {
return null;
}
/**
* Return the singleton EntityManagerFactory.
*/
@Override
@Nullable
public EntityManagerFactory getObject() {
return this.entityManagerFactory;
}
@Override
public Class<? extends EntityManagerFactory> getObjectType() {
return (this.entityManagerFactory != null ? this.entityManagerFactory.getClass() : EntityManagerFactory.class);
}
@Override
public boolean isSingleton() {
return true;
}
/**
* Close the EntityManagerFactory on bean factory shutdown.
*/
@Override
public void destroy() {
if (this.entityManagerFactory != null) {
if (logger.isInfoEnabled()) {
logger.info("Closing JPA EntityManagerFactory for persistence unit '" + getPersistenceUnitName() + "'");
}
this.entityManagerFactory.close();
}
}
//---------------------------------------------------------------------
// Serialization support
//---------------------------------------------------------------------
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
throw new NotSerializableException("An EntityManagerFactoryBean itself is not deserializable - " +
"just a SerializedEntityManagerFactoryBeanReference is");
}
protected Object writeReplace() throws ObjectStreamException {
if (this.beanFactory != null && this.beanName != null) {
return new SerializedEntityManagerFactoryBeanReference(this.beanFactory, this.beanName);
}
else {
throw new NotSerializableException("EntityManagerFactoryBean does not run within a BeanFactory");
}
}
/**
* Minimal bean reference to the surrounding AbstractEntityManagerFactoryBean.
* Resolved to the actual AbstractEntityManagerFactoryBean instance on deserialization.
*/
@SuppressWarnings("serial")
private static class SerializedEntityManagerFactoryBeanReference implements Serializable {
private final BeanFactory beanFactory;
private final String lookupName;
public SerializedEntityManagerFactoryBeanReference(BeanFactory beanFactory, String beanName) {
this.beanFactory = beanFactory;
this.lookupName = BeanFactory.FACTORY_BEAN_PREFIX + beanName;
}
private Object readResolve() {
return this.beanFactory.getBean(this.lookupName, AbstractEntityManagerFactoryBean.class);
}
}
/**
* Dynamic proxy invocation handler for an {@link EntityManagerFactory}, returning a
* proxy {@link EntityManager} (if necessary) from {@code createEntityManager} methods.
*/
@SuppressWarnings("serial")
private static class ManagedEntityManagerFactoryInvocationHandler implements InvocationHandler, Serializable {
private final AbstractEntityManagerFactoryBean entityManagerFactoryBean;
public ManagedEntityManagerFactoryInvocationHandler(AbstractEntityManagerFactoryBean emfb) {
this.entityManagerFactoryBean = emfb;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
switch (method.getName()) {
case "equals":
// Only consider equal when proxies are identical.
return (proxy == args[0]);
case "hashCode":
// Use hashCode of EntityManagerFactory proxy.
return System.identityHashCode(proxy);
case "unwrap":
// Handle JPA 2.1 unwrap method - could be a proxy match.
Class<?> targetClass = (Class<?>) args[0];
if (targetClass == null) {
return this.entityManagerFactoryBean.getNativeEntityManagerFactory();
}
else if (targetClass.isInstance(proxy)) {
return proxy;
}
break;
}
try {
return this.entityManagerFactoryBean.invokeProxyMethod(method, args);
}
catch (InvocationTargetException ex) {
throw ex.getTargetException();
}
}
}
}
相关信息
相关文章
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