org.hibernate.proxy.LazyInitializer Maven / Gradle / Ivy
Show all versions of beangle-hibernate-core Show documentation
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.proxy;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
/**
* Handles fetching of the underlying entity for a proxy.
*
* @author Gavin King
* @author Steve Ebersole
*/
public interface LazyInitializer {
/**
* Initialize the proxy, fetching the target entity if necessary.
*
* @throws HibernateException Indicates a problem initializing the proxy.
*
* @see org.hibernate.Hibernate#initialize(Object)
*/
void initialize() throws HibernateException;
/**
* Retrieve the identifier value for the entity our owning proxy represents.
*
* @return The identifier value.
*/
default Object getInternalIdentifier() {
return getIdentifier();
}
/**
* Retrieve the identifier value for the entity our owning proxy represents,
* without initializing the proxy.
*
* When JPA proxy compliance is enabled the proxy is initialized.
*
* @return The identifier value.
*/
Object getIdentifier();
/**
* Set the identifier value for the entity our owning proxy represents.
*
* @param id The identifier value.
*/
void setIdentifier(Object id);
/**
* The entity-name of the entity our owning proxy represents.
*
* @return The entity-name.
*/
String getEntityName();
/**
* Get the actual class of the entity. Generally, {@link #getEntityName()} should be used instead.
*
* @return The actual entity class.
*/
Class getPersistentClass();
/**
* Is the proxy uninitialized?
*
* @return True if uninitialized; false otherwise.
*
* @see org.hibernate.Hibernate#isInitialized(Object)
*/
boolean isUninitialized();
/**
* Return the underlying persistent object, initializing if necessary
*
* @return The underlying target entity.
*/
Object getImplementation();
/**
* Return the underlying persistent object in the given session, or null if not contained in this session's
* persistence context.
*
* @param session The session to check
*
* @return The target, or null.
*
* @throws HibernateException Indicates problem locating the target.
*/
Object getImplementation(SharedSessionContractImplementor session) throws HibernateException;
/**
* Initialize the proxy manually by injecting its target.
*
* @param target The proxy target (the actual entity being proxied).
*/
void setImplementation(Object target);
/**
* Is the proxy's read-only/modifiable setting available?
* @return true, if the setting is available
* false, if the proxy is detached or its associated session is closed
*/
boolean isReadOnlySettingAvailable();
/**
* Is the proxy read-only?
*
* The read-only/modifiable setting is not available when the proxy is
* detached or its associated session is closed.
*
* To check if the read-only/modifiable setting is available:
*
* @return true, if this proxy is read-only; false, otherwise
* @throws org.hibernate.TransientObjectException if the proxy is detached (getSession() == null)
* @throws org.hibernate.SessionException if the proxy is associated with a session that is closed
*
* @see LazyInitializer#isReadOnlySettingAvailable()
* @see org.hibernate.Session#isReadOnly(Object entityOrProxy)
*/
boolean isReadOnly();
/**
* Set an associated modifiable proxy to read-only mode, or a read-only
* proxy to modifiable mode. If the proxy is currently initialized, its
* implementation will be set to the same mode; otherwise, when the
* proxy is initialized, its implementation will have the same read-only/
* modifiable setting as the proxy. In read-only mode, no snapshot is
* maintained and the instance is never dirty checked.
*
* If the associated proxy already has the specified read-only/modifiable
* setting, then this method does nothing.
*
* @param readOnly if true, the associated proxy is made read-only;
* if false, the associated proxy is made modifiable.
* @throws org.hibernate.TransientObjectException if the proxy is not association with a session
* @throws org.hibernate.SessionException if the proxy is associated with a session that is closed
*
* @see org.hibernate.Session#setReadOnly(Object entityOrProxy, boolean readOnly)
*/
void setReadOnly(boolean readOnly);
/**
* Get the session to which this proxy is associated, or null if it is not attached.
*
* @return The associated session.
*/
SharedSessionContractImplementor getSession();
/**
* Associate the proxy with the given session.
*
* Care should be given to make certain that the proxy is added to the session's persistence context as well
* to maintain the symmetry of the association. That must be done separately as this method simply sets an
* internal reference. We do also check that if there is already an associated session that the proxy
* reference was removed from that previous session's persistence context.
*
* @param session The session
* @throws HibernateException Indicates that the proxy was still contained in the persistence context of the
* "previous session".
*/
void setSession(SharedSessionContractImplementor session) throws HibernateException;
/**
* Unset this initializer's reference to session. It is assumed that the caller is also taking care or
* cleaning up the owning proxy's reference in the persistence context.
*
* Generally speaking this is intended to be called only during {@link org.hibernate.Session#evict} and
* {@link org.hibernate.Session#clear} processing; most other use-cases should call {@link #setSession} instead.
*/
void unsetSession();
void setUnwrap(boolean unwrap);
boolean isUnwrap();
}