at.molindo.esi4j.module.hibernate.HibernateRebuildSession.java Source code

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Here is the source code for at.molindo.esi4j.module.hibernate.HibernateRebuildSession.java

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/**
 * Copyright 2010 Molindo GmbH
 *
 * Licensed under the Apache 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://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 at.molindo.esi4j.module.hibernate;

import java.util.List;

import org.hibernate.CacheMode;
import org.hibernate.FlushMode;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

import at.molindo.esi4j.module.hibernate.scrolling.ScrollingSession;
import at.molindo.esi4j.rebuild.Esi4JRebuildSession;

public final class HibernateRebuildSession implements Esi4JRebuildSession {

    private final Transaction _tx;
    private final Session _session;
    private final Class<?> _type;
    private final HibernateModule _module;
    private final ScrollingSession _scrollingSession;

    public HibernateRebuildSession(Class<?> type, SessionFactory sessionFactory, HibernateModule module,
            ScrollingSession scrollingSession) {
        if (type == null) {
            throw new NullPointerException("type");
        }
        if (sessionFactory == null) {
            throw new NullPointerException("sessionFactory");
        }
        if (module == null) {
            throw new NullPointerException("module");
        }

        _type = type;
        _module = module;
        _scrollingSession = scrollingSession;

        _session = sessionFactory.openSession();
        _session.setCacheMode(CacheMode.GET);
        _session.setDefaultReadOnly(true);
        _session.setFlushMode(FlushMode.MANUAL);
        _tx = _session.beginTransaction();
    }

    @Override
    public boolean isOrdered() {
        return _scrollingSession.isOrdered();
    }

    @Override
    public Class<?> getType() {
        return _type;
    }

    @Override
    public List<?> getNext(int batchSize) {
        // clear previous batch
        _session.clear();
        return _scrollingSession.fetch(_session, batchSize);
    }

    @Override
    public Object getMetadata() {
        return null;
    }

    @Override
    public void close() {
        _session.clear();
        _module.unsetRebuilding(_type);
        _tx.commit();
        _session.close();
    }

}