PersistenceEnv.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.Function;

import javax.persistence.EntityManager;

/** Persistence environment to perform a transaction. */
public abstract class PersistenceEnv {
  /** Run code inside a transaction. */
  public abstract <A> A tx(Function<EntityManager, A> transactional);

  /** {@link #tx(org.opencastproject.util.data.Function)} as a function. */
  public <A> Function<Function<EntityManager, A>, A> tx() {
    return new Function<Function<EntityManager, A>, A>() {
      @Override
      public A apply(Function<EntityManager, A> transactional) {
        return tx(transactional);
      }
    };
  }

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