debop4k.data.orm.hibernate.dao.HibernateAsyncDao.java Source code

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Here is the source code for debop4k.data.orm.hibernate.dao.HibernateAsyncDao.java

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/*
 * Copyright (c) 2016. Sunghyouk Bae <sunghyouk.bae@gmail.com>
 * 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 debop4k.data.orm.hibernate.dao;

import debop4k.core.asyncs.Asyncx;
import lombok.Getter;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import nl.komponents.kovenant.Promise;
import org.hibernate.Session;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Projections;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

import java.util.concurrent.Callable;

/**
 * Hibernate  ? Thread-safe  , ?   Session?    ?  ?? .
 *
 * @author sunghyouk.bae@gmail.com
 */
@Slf4j
@Getter
@Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
@Transactional
@SuppressWarnings("unchecked")
public class HibernateAsyncDao extends HibernateDao {

    /**
     * ? ? {@link DetachedCriteria} ??  ROW COUNT  .
     */
    public Promise<Long, Exception> countAsync(@NonNull DetachedCriteria dc) {
        return uniqueResultAsync(dc.setProjection(Projections.rowCount()));
    }

    /**
     * ? ? Criteria#uniqueResult  .
     */
    public <T> Promise<T, Exception> uniqueResultAsync(@NonNull final DetachedCriteria dc) {

        return Asyncx.future(new Callable<T>() {
            @Override
            public T call() throws Exception {
                Session sess = getSf().openSession();
                try {
                    return (T) dc.getExecutableCriteria(sess).uniqueResult();
                } finally {
                    sess.close();
                }
            }
        });
    }

}