DaoTransaction.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2021 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.jpa;
 
import java.io.Closeable;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.persistence.EntityTransaction;
import javax.persistence.Query;
import javax.persistence.criteria.CriteriaDelete;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.CriteriaUpdate;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.exception.ElephantException;
import org.turro.util.AtomicCounter;
 
public class DaoTransaction implements Closeable {
 
  private final DaoManager manager;
  private final EntityTransaction transaction;
 
  public DaoTransaction(Dao dao) {
    this.manager = new DaoManager(dao);
    this.transaction = manager.getManager().getTransaction();
    startTransaction();
  }
  
  /* DaoManager delegates */
 
  public <T> T saveObject(T obj) {
    return manager.saveObject(obj);
  }
 
  public void persist(Object obj) {
    manager.persist(obj);
  }
 
  public <T> T find(Class<T> javaClass, Object arg) {
    return manager.find(javaClass, arg);
  }
 
  public void remove(Object obj) {
    manager.remove(saveObject(obj));
  }
 
  public <T> Query createQuery(CriteriaQuery<T> query) {
    return manager.createQuery(query);
  }
 
  public <T> Query createQuery(String clause, Class<T> javaClass) {
    return manager.createQuery(clause, javaClass);
  }
 
  public Query createQuery(String clause) {
    return manager.createQuery(clause);
  }
 
  public Query createQuery(CriteriaDelete delete) {
    return manager.createQuery(delete);
  }
 
  public Query createQuery(CriteriaUpdate update) {
    return manager.createQuery(update);
  }
 
  public Query createNativeQuery(String clause, Class resultClass) {
    return manager.createNativeQuery(clause, resultClass);
  }
 
  public Query createNativeQuery(String clause) {
    return manager.createNativeQuery(clause);
  }
 
  public void setNamedParameters(Query q, Map<String, Object> parameters) {
    manager.setNamedParameters(q, parameters);
  }
 
  public Dao getDao() {
    return manager.getDao();
  }
  
  /* End delegates */
  
  @Override
  public void close() {
    if(transaction != null && transaction.isActive()) {
      try {
        transaction.commit();
      } catch (Exception ex) {
        Logger.getLogger(DaoTransaction.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
        try {
          transaction.rollback();
        } catch (Exception e) {
          throw new ElephantException(e);
        }
      } finally {
        manager.close();
        openTransactions.decrement();
      }
    } else {
      manager.close();
    }
  }
 
  private void startTransaction() {
    if(transaction != null && !transaction.isActive()) {
      transaction.begin();
      openTransactions.increment();
    }
  }
 
  /* Debug */
  
  private static final AtomicCounter openTransactions = new AtomicCounter();
 
  public static AtomicCounter getCounter() {
    return openTransactions;
  }
 
}