/
HibernateRepositoryImpl.java
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/
HibernateRepositoryImpl.java
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package com.vladmihalcea.spring.repository;
import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import org.hibernate.Session;
import org.hibernate.engine.jdbc.spi.JdbcServices;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.internal.AbstractSharedSessionContract;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Supplier;
/**
* @author Vlad Mihalcea
*/
public class HibernateRepositoryImpl<T> implements HibernateRepository<T> {
@PersistenceContext
private EntityManager entityManager;
@Override
public List<T> findAll() {
throw new UnsupportedOperationException("Fetching all records from a given database table is a terrible idea!");
}
@Override
public <S extends T> S save(S entity) {
return unsupportedSave();
}
@Override
public <S extends T> List<S> saveAll(Iterable<S> entities) {
return unsupportedSave();
}
@Override
public <S extends T> S saveAndFlush(S entity) {
return unsupportedSave();
}
@Override
public <S extends T> List<S> saveAllAndFlush(Iterable<S> entities) {
return unsupportedSave();
}
public <S extends T> S persist(S entity) {
entityManager.persist(entity);
return entity;
}
public <S extends T> S persistAndFlush(S entity) {
persist(entity);
entityManager.flush();
return entity;
}
public <S extends T> List<S> persistAll(Iterable<S> entities) {
List<S> result = new ArrayList<>();
for(S entity : entities) {
result.add(persist(entity));
}
return result;
}
public <S extends T> List<S> peristAllAndFlush(Iterable<S> entities) {
return executeBatch(() -> {
List<S> result = new ArrayList<>();
for(S entity : entities) {
result.add(persist(entity));
}
entityManager.flush();
return result;
});
}
public <S extends T> S merge(S entity) {
return entityManager.merge(entity);
}
@Override
public <S extends T> S mergeAndFlush(S entity) {
S result = merge(entity);
entityManager.flush();
return result;
}
@Override
public <S extends T> List<S> mergeAll(Iterable<S> entities) {
List<S> result = new ArrayList<>();
for(S entity : entities) {
result.add(merge(entity));
}
return result;
}
@Override
public <S extends T> List<S> mergeAllAndFlush(Iterable<S> entities) {
return executeBatch(() -> {
List<S> result = new ArrayList<>();
for(S entity : entities) {
result.add(merge(entity));
}
entityManager.flush();
return result;
});
}
public <S extends T> S update(S entity) {
session().update(entity);
return entity;
}
@Override
public <S extends T> S updateAndFlush(S entity) {
update(entity);
entityManager.flush();
return entity;
}
@Override
public <S extends T> List<S> updateAll(Iterable<S> entities) {
List<S> result = new ArrayList<>();
for(S entity : entities) {
result.add(update(entity));
}
return result;
}
@Override
public <S extends T> List<S> updateAllAndFlush(Iterable<S> entities) {
return executeBatch(() -> {
List<S> result = new ArrayList<>();
for(S entity : entities) {
result.add(update(entity));
}
entityManager.flush();
return result;
});
}
protected Integer getBatchSize(Session session) {
SessionFactoryImplementor sessionFactory = session.getSessionFactory().unwrap(SessionFactoryImplementor.class);
final JdbcServices jdbcServices = sessionFactory.getServiceRegistry().getService(JdbcServices.class);
if(!jdbcServices.getExtractedMetaDataSupport().supportsBatchUpdates()) {
return Integer.MIN_VALUE;
}
return session.unwrap(AbstractSharedSessionContract.class).getConfiguredJdbcBatchSize();
}
protected <R> R executeBatch(Supplier<R> callback) {
Session session = session();
Integer jdbcBatchSize = getBatchSize(session);
Integer originalSessionBatchSize = session.getJdbcBatchSize();
try {
if (jdbcBatchSize == null) {
session.setJdbcBatchSize(10);
}
return callback.get();
} finally {
session.setJdbcBatchSize(originalSessionBatchSize);
}
}
protected Session session() {
return entityManager.unwrap(Session.class);
}
protected <S extends T> S unsupportedSave() {
throw new UnsupportedOperationException("There's no such thing as a save method in JPA, so don't use this hack!");
}
}