Interceptor 介面

package org.hibernate;

import java.io.Serializable;
import java.util.Iterator;

import org.hibernate.type.Type;

public interface Interceptor {
    // 載入物件之前執行
    public boolean onLoad(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws CallbackException;

    // flush 時，如果發現有Dirty data，則執行此方法
    public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState, String[] propertyNames, Type[] types) throws CallbackException;

    // 儲存物件前執行
    public boolean onSave(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws CallbackException;

    // 刪除物件前執行
    public void onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) throws CallbackException;

    // 在 flush 前執行
    public void preFlush(Iterator entities) throws CallbackException;

    // 在 flush 後執行
    public void postFlush(Iterator entities) throws CallbackException;
 
    // 判斷傳入的物件是否為 transient 狀態
    public Boolean isTransient(Object entity);

    // flush 前呼叫這個方法判斷 Dirty data
    // 傳回Dirty data屬性索引或null採預設行為
    public int[] findDirty(Object entity, Serializable id, Object[] currentState, Object[] previousState, String[] propertyNames, Type[] types);

    // 手動建立實體物件，如果傳回 null，則使用預設的建構方法建立實例
    public Object instantiate(String entityName, EntityMode entityMode, Serializable id) throws CallbackException;

    // 傳回實體名稱
    public String getEntityName(Object object) throws CallbackException;

    // 取得實體物件
    public Object getEntity(String entityName, Serializable id) throws CallbackException;

    // beginTransaction() 之後執行
    public void afterTransactionBegin(Transaction tx);

    // 在事務完成前執行
    public void beforeTransactionCompletion(Transaction tx);

    // 在事務完成後執行
    public void afterTransactionCompletion(Transaction tx);
}

package onlyfun.caterpillar;
....
public class SomeInterceptor implements Interceptor {
    ....
}

SomeInterceptor someInterceptor = new SomeInterceptor();
Session session = sessionFactory.openSession(someInterceptor);
....