PersistenceEnv2.java

/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License
 * at:
 *
 *   http://opensource.org/licenses/ecl2.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 *
 */

package org.opencastproject.util.persistence;

import org.opencastproject.util.data.Either;
import org.opencastproject.util.data.Function;

import javax.persistence.EntityManager;

/**
 * Persistence environment that handles errors with an either instead of throwing exceptions.
 *
 * @see PersistenceEnv
 */
public interface PersistenceEnv2<F> {
  /** Run code inside a transaction. */
  <A> Either<F, A> tx(Function<EntityManager, A> transactional);

  /** Close the environment and free all associated resources. */
  void close();
}