cloudstack/server/src/com/cloud/storage/dao/StoragePoolHostDaoImpl.java

/**
 *  Copyright (C) 2010 Cloud.com, Inc.  All rights reserved.
 * 
 * This software is licensed under the GNU General Public License v3 or later.
 * 
 * It 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 3 of the License, or 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, see <http://www.gnu.org/licenses/>.
 * 
 */

package com.cloud.storage.dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.ejb.Local;

import org.apache.log4j.Logger;

import com.cloud.host.Status;
import com.cloud.storage.StoragePoolHostVO;
import com.cloud.utils.Pair;
import com.cloud.utils.db.GenericDaoBase;
import com.cloud.utils.db.SearchBuilder;
import com.cloud.utils.db.SearchCriteria;
import com.cloud.utils.db.Transaction;

@Local(value = { StoragePoolHostDao.class })
public class StoragePoolHostDaoImpl extends GenericDaoBase<StoragePoolHostVO, Long> implements StoragePoolHostDao {
    public static final Logger s_logger = Logger.getLogger(StoragePoolHostDaoImpl.class.getName());

    protected final SearchBuilder<StoragePoolHostVO> PoolSearch;
    protected final SearchBuilder<StoragePoolHostVO> HostSearch;
    protected final SearchBuilder<StoragePoolHostVO> PoolHostSearch;

    protected static final String HOST_FOR_POOL_SEARCH = "SELECT * FROM storage_pool_host_ref ph,  host h where  ph.host_id = h.id and ph.pool_id=? and h.status=? ";

    protected static final String STORAGE_POOL_HOST_INFO = "SELECT p.data_center_id,  count(ph.host_id) " + " FROM storage_pool p, storage_pool_host_ref ph "
            + " WHERE p.id = ph.pool_id AND p.data_center_id = ? " + " GROUP by p.data_center_id";

    protected static final String SHARED_STORAGE_POOL_HOST_INFO = "SELECT p.data_center_id,  count(ph.host_id) " + " FROM storage_pool p, storage_pool_host_ref ph "
            + " WHERE p.id = ph.pool_id AND p.data_center_id = ? " + " AND p.pool_type NOT IN ('LVM', 'Filesystem')" + " GROUP by p.data_center_id";

    protected static final String DELETE_PRIMARY_RECORDS = "DELETE " + "FROM storage_pool_host_ref " + "WHERE host_id = ?";

    public StoragePoolHostDaoImpl() {
        PoolSearch = createSearchBuilder();
        PoolSearch.and("pool_id", PoolSearch.entity().getPoolId(), SearchCriteria.Op.EQ);
        PoolSearch.done();

        HostSearch = createSearchBuilder();
        HostSearch.and("host_id", HostSearch.entity().getHostId(), SearchCriteria.Op.EQ);
        HostSearch.done();

        PoolHostSearch = createSearchBuilder();
        PoolHostSearch.and("pool_id", PoolHostSearch.entity().getPoolId(), SearchCriteria.Op.EQ);
        PoolHostSearch.and("host_id", PoolHostSearch.entity().getHostId(), SearchCriteria.Op.EQ);
        PoolHostSearch.done();

    }

    @Override
    public List<StoragePoolHostVO> listByPoolId(long id) {
        SearchCriteria<StoragePoolHostVO> sc = PoolSearch.create();
        sc.setParameters("pool_id", id);
        return listIncludingRemovedBy(sc);
    }

    @Override
    public List<StoragePoolHostVO> listByHostIdIncludingRemoved(long hostId) {
        SearchCriteria<StoragePoolHostVO> sc = HostSearch.create();
        sc.setParameters("host_id", hostId);
        return listIncludingRemovedBy(sc);
    }
    
    @Override
    public List<StoragePoolHostVO> listByHostId(long hostId) {
        SearchCriteria<StoragePoolHostVO> sc = HostSearch.create();
        sc.setParameters("host_id", hostId);
        return listBy(sc);
    }

    @Override
    public StoragePoolHostVO findByPoolHost(long poolId, long hostId) {
        SearchCriteria<StoragePoolHostVO> sc = PoolHostSearch.create();
        sc.setParameters("pool_id", poolId);
        sc.setParameters("host_id", hostId);
        return findOneIncludingRemovedBy(sc);
    }

    @Override
    public List<StoragePoolHostVO> listByHostStatus(long poolId, Status hostStatus) {
        Transaction txn = Transaction.currentTxn();
        PreparedStatement pstmt = null;
        List<StoragePoolHostVO> result = new ArrayList<StoragePoolHostVO>();
        ResultSet rs = null;
        try {
            String sql = HOST_FOR_POOL_SEARCH;
            pstmt = txn.prepareStatement(sql);

            pstmt.setLong(1, poolId);
            pstmt.setString(2, hostStatus.toString());
            rs = pstmt.executeQuery();
            while (rs.next()) {
                // result.add(toEntityBean(rs, false)); TODO: this is buggy in GenericDaoBase for hand constructed queries
                long id = rs.getLong(1); // ID column
                result.add(findById(id));
            }
        } catch (Exception e) {
            s_logger.warn("Exception: ", e);
        } finally {
            try {
                if (rs != null) {
                    rs.close();
                }
                if (pstmt != null) {
                    pstmt.close();
                }
            } catch (SQLException e) {
            }
        }
        return result;

    }

    @Override
    public List<Pair<Long, Integer>> getDatacenterStoragePoolHostInfo(long dcId, boolean sharedOnly) {
        ArrayList<Pair<Long, Integer>> l = new ArrayList<Pair<Long, Integer>>();
        String sql = sharedOnly ? SHARED_STORAGE_POOL_HOST_INFO : STORAGE_POOL_HOST_INFO;
        Transaction txn = Transaction.currentTxn();
        ;
        PreparedStatement pstmt = null;
        try {
            pstmt = txn.prepareAutoCloseStatement(sql);
            pstmt.setLong(1, dcId);

            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                l.add(new Pair<Long, Integer>(rs.getLong(1), rs.getInt(2)));
            }
        } catch (SQLException e) {
        } catch (Throwable e) {
        }
        return l;
    }

    /**
     * This method deletes the primary records from the host
     * 
     * @param hostId
     *            -- id of the host
     */
    @Override
    public void deletePrimaryRecordsForHost(long hostId) {
        SearchCriteria<StoragePoolHostVO> sc = HostSearch.create();
        sc.setParameters("host_id", hostId);
        Transaction txn = Transaction.currentTxn();
        txn.start();
        remove(sc);
        txn.commit();
    }

    @Override
    public void deleteStoragePoolHostDetails(long hostId, long poolId) {
        SearchCriteria<StoragePoolHostVO> sc = PoolHostSearch.create();
        sc.setParameters("host_id", hostId);
        sc.setParameters("pool_id", poolId);
        Transaction txn = Transaction.currentTxn();
        txn.start();
        remove(sc);
        txn.commit();
    }
}