package org.hivedb.hibernate;
import org.hibernate.CallbackException;
import org.hibernate.EmptyInterceptor;
import org.hibernate.EntityMode;
import org.hibernate.Interceptor;
import org.hibernate.shards.util.InterceptorDecorator;
import org.hibernate.type.Type;
import org.hivedb.Hive;
import org.hivedb.HiveLockableException;
import org.hivedb.annotations.AnnotationHelper;
import org.hivedb.annotations.EntityId;
import org.hivedb.configuration.EntityConfig;
import org.hivedb.configuration.EntityHiveConfig;
import org.hivedb.util.classgen.GeneratedClassFactory;
import org.hivedb.util.classgen.GeneratedInstanceInterceptor;
import org.hivedb.util.classgen.ReflectionTools;
import org.hivedb.util.functional.Filter;
import org.hivedb.util.functional.Predicate;
import org.hivedb.util.functional.Transform;
import org.hivedb.util.functional.Unary;
import org.springframework.beans.BeanUtils;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Iterator;
public class HiveInterceptorDecorator extends InterceptorDecorator implements Interceptor {
private EntityHiveConfig hiveConfig;
private HiveIndexer indexer;
@SuppressWarnings("unchecked")
@Override
public Object instantiate(String entityName, EntityMode entityMode, Serializable id) throws CallbackException {
Class<?> clazz;
try {
clazz = Class.forName(entityName);
} catch (ClassNotFoundException e) {
throw new CallbackException(String.format("Unable to load class for %s", entityName), e);
}
if (EntityResolver.generatesImplementation(clazz))
return getInstance(GeneratedClassFactory.getGeneratedClass(clazz));
else if (EntityResolver.isGeneratedImplementation(clazz)) {
Class generatingClass = Filter.grepSingle(new Predicate<Class>() {
public boolean f(Class item) {
return EntityResolver.generatesImplementation(item);
}
}, Arrays.asList(clazz.getInterfaces()));
Object instance = getInstance(GeneratedClassFactory.getGeneratedClass(generatingClass));
Method idMethod = AnnotationHelper.getFirstMethodWithAnnotation(generatingClass, EntityId.class);
if (idMethod != null)
GeneratedInstanceInterceptor.setProperty(instance, BeanUtils.findPropertyForMethod(idMethod).getName(), id);
return instance;
} else
return super.instantiate(entityName, entityMode, id);
}
private Object getInstance(Class<?> clazz) {
try {
return clazz.newInstance();
} catch (InstantiationException e) {
throw new CallbackException(e);
} catch (IllegalAccessException e) {
throw new CallbackException(e);
}
}
public HiveInterceptorDecorator(EntityHiveConfig hiveConfig, Hive hive) {
this(EmptyInterceptor.INSTANCE, hiveConfig, hive);
}
public HiveInterceptorDecorator(Interceptor interceptor, EntityHiveConfig hiveConfig, Hive hive) {
super(interceptor);
this.hiveConfig = hiveConfig;
this.indexer = new HiveIndexer(hive);
}
@Override
public Boolean isTransient(Object entity) {
Class<?> clazz = new EntityResolver(hiveConfig).resolveEntityInterface(entity.getClass());
if (clazz != null)
return !indexer.exists(this.hiveConfig.getEntityConfig(clazz), entity);
return super.isTransient(entity);
}
@SuppressWarnings("unchecked")
private Class resolveEntityClass(Class clazz) {
return ReflectionTools.whichIsImplemented(
clazz,
Transform.map(new Unary<EntityConfig, Class>() {
public Class f(EntityConfig entityConfig) {
return entityConfig.getRepresentedInterface();
}
},
hiveConfig.getEntityConfigs()));
}
@Override
public void onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws CallbackException {
try {
final Class<?> resolvedEntityClass = resolveEntityClass(entity.getClass());
if (resolvedEntityClass != null)
indexer.delete(hiveConfig.getEntityConfig(entity.getClass()), entity);
} catch (HiveLockableException e) {
throw new CallbackException(e);
}
super.onDelete(entity, id, state, propertyNames, types);
}
@SuppressWarnings("unchecked")
@Override
public void postFlush(Iterator entities) throws CallbackException {
while (entities.hasNext()) {
Object entity = entities.next();
Class<?> resolvedClass = resolveEntityClass(entity.getClass());
if (resolvedClass != null) {
final EntityConfig entityConfig = hiveConfig.getEntityConfig(resolvedClass);
if (indexer.exists(entityConfig, entity))
updateIndexes(entity);
else
insertIndexes(entity);
}
}
super.postFlush(entities);
}
private void updateIndexes(Object entity) {
try {
final Class<?> resolvedEntityClass = resolveEntityClass(entity.getClass());
if (resolvedEntityClass != null) {
final EntityConfig entityConfig = hiveConfig.getEntityConfig(entity.getClass());
if (indexer.idExists(entityConfig, entityConfig.getId(entity)))
indexer.updatePartitionDimensionIndexIfNeeded(hiveConfig.getEntityConfig(resolvedEntityClass), entity);
indexer.update(entityConfig, entity);
}
} catch (HiveLockableException e) {
throw new CallbackException(e);
}
}
private void insertIndexes(Object entity) {
try {
final Class<?> resolvedEntityClass = resolveEntityClass(entity.getClass());
if (resolvedEntityClass != null)
indexer.insert(hiveConfig.getEntityConfig(resolvedEntityClass), entity);
} catch (HiveLockableException e) {
throw new CallbackException(e);
}
}
}