com.ushahidi.swiftriver.core.api.dao.impl.JpaSequenceDao.java Source code

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Here is the source code for com.ushahidi.swiftriver.core.api.dao.impl.JpaSequenceDao.java

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/**
 * 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/agpl.html>
 * 
 * Copyright (C) Ushahidi Inc. All Rights Reserved.
 */
package com.ushahidi.swiftriver.core.api.dao.impl;

import javax.persistence.LockModeType;

import org.springframework.stereotype.Repository;

import com.ushahidi.swiftriver.core.api.dao.SequenceDao;
import com.ushahidi.swiftriver.core.model.Sequence;

@Repository
public class JpaSequenceDao extends AbstractJpaDao<Sequence> implements SequenceDao {

    /**
     * Override to obtain a pessimistic lock on the entity.
     * 
     * @param id
     * @return
     */
    @Override
    public Sequence findById(Object id) {
        return (Sequence) em.find(Sequence.class, id, LockModeType.PESSIMISTIC_WRITE);
    }

    /**
     * Obtain a range of IDs from the sequence
     * 
     * @param num
     * @return
     */
    public long getIds(Sequence seq, int num) {
        long start = seq.getId();

        seq.setId(seq.getId() + num);
        em.merge(seq);

        return start + 1;
    }

}