Package org.hibernate.proxy

Interface LazyInitializer

All Known Implementing Classes:
AbstractLazyInitializer, BasicLazyInitializer, CGLIBLazyInitializer, Dom4jLazyInitializer, JavassistLazyInitializer, MapLazyInitializer
public interface LazyInitializer
Handles fetching of the underlying entity for a proxy

  • Method Details

    • initialize

      void initialize() throws HibernateException
      Initialize the proxy, fetching the target entity if necessary.
      Throws:
      HibernateException - Indicates a problem initializing the proxy.

    • getIdentifier

      Serializable getIdentifier()
      Retrieve the identifier value for the enity our owning proxy represents.
      Returns:
      The identifier value.

    • setIdentifier

      void setIdentifier(Serializable id)
      Set the identifier value for the enity our owning proxy represents.
      Parameters:
      id - The identifier value.

    • getEntityName

      String getEntityName()
      The entity-name of the entity our owning proxy represents.
      Returns:
      The entity-name.

    • getPersistentClass

      Class getPersistentClass()
      Get the actual class of the entity. Generally, getEntityName() should be used instead.
      Returns:
      The actual entity class.

    • isUninitialized

      boolean isUninitialized()
      Is the proxy uninitialzed?
      Returns:
      True if uninitialized; false otherwise.

    • getImplementation

      Object getImplementation()
      Return the underlying persistent object, initializing if necessary
      Returns:
      The underlying target entity.

    • getImplementation

      Object getImplementation(SessionImplementor session) throws HibernateException
      Return the underlying persistent object in the given session, or null if not contained in this session's persistence context.
      Parameters:
      session - The session to check
      Returns:
      The target, or null.
      Throws:
      HibernateException - Indicates problem locating the target.

    • setImplementation

      void setImplementation(Object target)
      Initialize the proxy manually by injecting its target.
      Parameters:
      target - The proxy target (the actual entity being proxied).

    • isReadOnlySettingAvailable

      boolean isReadOnlySettingAvailable()
      Is the proxy's read-only/modifiable setting available?
      Returns:
      true, if the setting is available false, if the proxy is detached or its associated session is closed

    • isReadOnly

      boolean isReadOnly()
      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:
      Returns:
      true, if this proxy is read-only; false, otherwise
      Throws:
      TransientObjectException - if the proxy is detached (getSession() == null)
      SessionException - if the proxy is associated with a sesssion that is closed
      See Also:

    • setReadOnly

      void setReadOnly(boolean readOnly)
      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.
      Parameters:
      readOnly - , if true, the associated proxy is made read-only; if false, the associated proxy is made modifiable.
      Throws:
      TransientObjectException - if the proxy is not association with a session
      SessionException - if the proxy is associated with a sesssion that is closed
      See Also:

    • getSession

      SessionImplementor getSession()
      Get the session to which this proxy is associated, or null if it is not attached.
      Returns:
      The associated session.

    • setSession

      void setSession(SessionImplementor session) throws HibernateException
      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 symetry of the association. That must be done seperately 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 contet.

      Parameters:
      session - The session
      Throws:
      HibernateException - Indicates that the proxy was still contained in the persistence context of the "previous session".

    • unsetSession

      void unsetSession()
      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 Session.evict(java.lang.Object) and Session.clear() processing; most other use-cases should call setSession(org.hibernate.engine.SessionImplementor) instead.

    • setUnwrap

      void setUnwrap(boolean unwrap)

    • isUnwrap

      boolean isUnwrap()