io.hops.metadata.ndb.dalimpl.yarn.YarnVariablesClusterJ.java Source code

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Here is the source code for io.hops.metadata.ndb.dalimpl.yarn.YarnVariablesClusterJ.java

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/*
 * Hops Database abstraction layer for storing the hops metadata in MySQL Cluster
 * Copyright (C) 2015  hops.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package io.hops.metadata.ndb.dalimpl.yarn;

import com.mysql.clusterj.annotation.Column;
import com.mysql.clusterj.annotation.PersistenceCapable;
import com.mysql.clusterj.annotation.PrimaryKey;
import io.hops.exception.StorageException;
import io.hops.metadata.ndb.ClusterjConnector;
import io.hops.metadata.ndb.wrapper.HopsSession;
import io.hops.metadata.yarn.TablesDef;
import io.hops.metadata.yarn.dal.YarnVariablesDataAccess;
import io.hops.metadata.yarn.entity.YarnVariables;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Table with one row that is used to obtain unique ids for tables. This
 * solution can be dropped once ClusterJ implements auto-increment.
 */
public class YarnVariablesClusterJ
        implements TablesDef.YarnVariablesTableDef, YarnVariablesDataAccess<YarnVariables> {

    private static final Log LOG = LogFactory.getLog(YarnVariablesClusterJ.class);

    @PersistenceCapable(table = TABLE_NAME)
    public interface YarnVariablesDTO {

        @PrimaryKey
        @Column(name = ID)
        int getid();

        void setid(int id);

        @Column(name = VALUE)
        int getvalue();

        void setvalue(int value);
    }

    private final ClusterjConnector connector = ClusterjConnector.getInstance();

    @Override
    public YarnVariables findById(int id) throws StorageException {
        LOG.debug("HOP :: ClusterJ YarnVariables.findById - START:" + id);
        HopsSession session = connector.obtainSession();
        YarnVariablesDTO yarnDTO;
        if (session != null) {
            if (id == Integer.MIN_VALUE) {
                id = idVal;
            }
            yarnDTO = session.find(YarnVariablesDTO.class, id);
            LOG.debug("HOP :: ClusterJ YarnVariables.findById - FINISH:" + id);
            if (yarnDTO != null) {
                return new YarnVariables(yarnDTO.getid(), yarnDTO.getvalue());
            }
        }
        return null;
    }

    @Override
    public void add(YarnVariables toAdd) throws StorageException {
        HopsSession session = connector.obtainSession();
        session.savePersistent(createPersistable(toAdd, session));
    }

    private YarnVariablesDTO createPersistable(YarnVariables yarnVariables, HopsSession session)
            throws StorageException {
        YarnVariablesDTO yarnDTO = session.newInstance(YarnVariablesDTO.class);
        yarnDTO.setid(yarnVariables.getId());
        yarnDTO.setvalue(yarnVariables.getValue());
        return yarnDTO;
    }
}