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

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Here is the source code for at.molindo.esi4j.module.hibernate.HibernateModule.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.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentMap;

import org.hibernate.SessionFactory;
import org.hibernate.metadata.ClassMetadata;

import at.molindo.esi4j.module.Esi4JModule;
import at.molindo.esi4j.module.hibernate.scrolling.DefaultQueryScrollingSession;
import at.molindo.esi4j.module.hibernate.scrolling.ScrollingSession;
import at.molindo.esi4j.module.hibernate.scrolling.ScrollingSessionProvider;
import at.molindo.esi4j.rebuild.Esi4JRebuildSession;
import at.molindo.thirdparty.org.compass.core.util.concurrent.ConcurrentHashSet;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

public class HibernateModule implements Esi4JModule {

    private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(HibernateModule.class);

    private final SessionFactory _sessionFactory;

    private final ConcurrentHashSet<Class<?>> _rebuilding = new ConcurrentHashSet<Class<?>>();

    private final List<Class<?>> _types;

    private final ConcurrentMap<Class<?>, ScrollingSessionProvider> _scrollingProviders = Maps.newConcurrentMap();

    public HibernateModule(SessionFactory sessionFactory) {
        if (sessionFactory == null) {
            throw new NullPointerException("sessionFactory");
        }
        _sessionFactory = sessionFactory;

        // calculate types
        List<Class<?>> list = Lists.newArrayList();
        for (ClassMetadata classMetadata : sessionFactory.getAllClassMetadata().values()) {
            Class<?> type = classMetadata.getMappedClass();
            if (type != null) {
                list.add(type);
            }
        }
        _types = Collections.unmodifiableList(list);
    }

    @Override
    public Esi4JRebuildSession startRebuildSession(final Class<?> type) {
        if (type == null) {
            throw new NullPointerException("type");
        } else if (!_rebuilding.add(type)) {
            throw new IllegalStateException("already indexing " + type.getName());
        } else {
            return new HibernateRebuildSession(type, _sessionFactory, this, newScrollingSession(type));
        }
    }

    private ScrollingSession newScrollingSession(final Class<?> type) {
        ScrollingSessionProvider scrollingSessionProvider = _scrollingProviders.get(type);
        return scrollingSessionProvider == null ? new DefaultQueryScrollingSession(type)
                : scrollingSessionProvider.newScrollingSession();
    }

    void unsetRebuilding(Class<?> type) {
        if (!_rebuilding.remove(type)) {
            log.warn("type " + type.getName() + " not currently indexing");
        }
    }

    public void putScrollingProvider(ScrollingSessionProvider scrollingProvider) {
        if (scrollingProvider == null) {
            throw new NullPointerException("scrollingProvider");
        }
        // should we fail on duplicate types?
        _scrollingProviders.put(scrollingProvider.getType(), scrollingProvider);
    }

    @Override
    public Class<?>[] getTypes() {
        return _types.toArray(new Class<?>[_types.size()]);
    }

    @Override
    public void close() {
    }

    public SessionFactory getSessionFactory() {
        return _sessionFactory;
    }

}