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JpaStoreProvider.java
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JpaStoreProvider.java
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package io.jes.provider;
import java.util.Collection;
import java.util.UUID;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.annotation.Nonnull;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.persistence.Query;
import javax.persistence.TypedQuery;
import io.jes.Event;
import io.jes.ex.BrokenStoreException;
import io.jes.ex.VersionMismatchException;
import io.jes.provider.jpa.StoreEntry;
import io.jes.provider.jpa.StoreEntryFactory;
import io.jes.serializer.Serializer;
import io.jes.serializer.SerializationOption;
import io.jes.serializer.SerializerFactory;
import io.jes.snapshot.SnapshotReader;
import lombok.extern.slf4j.Slf4j;
import static java.lang.Integer.MAX_VALUE;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
/**
* JPA {@link StoreProvider} implementation.
*
* @param <T> type of event serialization.
*/
@Slf4j
public class JpaStoreProvider<T> implements StoreProvider, SnapshotReader {
private static final int FETCH_SIZE = 100;
private final EntityManager entityManager;
private final Serializer<Event, T> serializer;
private final Class<? extends StoreEntry> entryType;
private static final String QUERY_BY_UUID = "SELECT e FROM %s e WHERE e.uuid = :uuid ORDER BY id";
private static final String DELETE_BY_UUID = "DELETE FROM %s e WHERE e.uuid = :uuid";
private static final String QUERY_COUNT_BY_UUID = "SELECT COUNT(e) FROM %s e WHERE e.uuid = :uuid";
private static final String QUERY_BY_OFFSET = "SELECT e FROM %s e WHERE e.id > :id ORDER BY id";
public JpaStoreProvider(@Nonnull EntityManager entityManager, @Nonnull Class<T> serializationType,
@Nonnull SerializationOption... options) {
this.entityManager = requireNonNull(entityManager, "EntityManager must not be null");
this.serializer = SerializerFactory.newEventSerializer(serializationType, options);
this.entryType = StoreEntryFactory.entryTypeOf(serializationType);
}
@Override
public Stream<Event> readFrom(long offset) {
final TypedQuery<? extends StoreEntry> query = entityManager.createQuery(
format(QUERY_BY_OFFSET, entryType.getName()), entryType
);
query.setParameter("id", offset);
query.setHint("org.hibernate.readOnly", true);
query.setHint("org.hibernate.fetchSize", FETCH_SIZE);
return query.getResultStream().map(storeEntry -> serializer.deserialize(storeEntry.getData()));
}
@Override
public Collection<Event> readBy(@Nonnull UUID uuid) {
return readBy(uuid, 0);
}
@Override
public Collection<Event> readBy(@Nonnull UUID uuid, long skip) {
final TypedQuery<? extends StoreEntry> query = entityManager.createQuery(
format(QUERY_BY_UUID, entryType.getName()), entryType
);
query.setParameter("uuid", uuid);
query.setMaxResults(MAX_VALUE);
query.setFirstResult((int) skip);
query.setHint("org.hibernate.readOnly", true);
query.setHint("org.hibernate.fetchSize", FETCH_SIZE);
return query.getResultStream()
.map(storeEntry -> serializer.deserialize(storeEntry.getData()))
.collect(Collectors.toList());
}
@Override
public void write(@Nonnull Event event) {
final UUID uuid = event.uuid();
final long expectedVersion = event.expectedStreamVersion();
if (uuid != null && expectedVersion != -1) {
final TypedQuery<Long> versionQuery = entityManager.createQuery(
format(QUERY_COUNT_BY_UUID, entryType.getName()), Long.class
);
versionQuery.setParameter("uuid", uuid);
final Long actualVersion = versionQuery.getSingleResult();
if (expectedVersion != actualVersion) {
throw new VersionMismatchException(expectedVersion, actualVersion);
}
}
final T data = serializer.serialize(event);
final StoreEntry entry = StoreEntryFactory.newEntry(uuid, data);
doInTransaction(() -> entityManager.persist(entry));
}
@Override
public void deleteBy(@Nonnull UUID uuid) {
log.warn("Prepare to remove {} event stream", uuid);
final Query query = entityManager.createQuery(format(DELETE_BY_UUID, entryType.getName()));
query.setParameter("uuid", uuid);
doInTransaction(() -> {
final int affectedEvents = query.executeUpdate();
log.warn("{} events successfully removed", affectedEvents);
});
}
private void doInTransaction(@Nonnull Runnable action) {
final EntityTransaction transaction = entityManager.getTransaction();
try {
transaction.begin();
action.run();
} catch (Exception e) {
transaction.setRollbackOnly();
throw new BrokenStoreException(e);
} finally {
transaction.commit();
}
}
}