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// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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
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// specific language governing permissions and limitations
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package com.cloud.cluster.dao;

import java.util.List;

import javax.ejb.Local;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;

import com.cloud.cluster.ManagementServerHost;
import com.cloud.cluster.ManagementServerHostPeerVO;
import com.cloud.utils.db.DB;
import com.cloud.utils.db.GenericDaoBase;
import com.cloud.utils.db.SearchBuilder;
import com.cloud.utils.db.SearchCriteria;
import com.cloud.utils.db.Transaction;

@Component
@Local(value={ManagementServerHostPeerDao.class})
public class ManagementServerHostPeerDaoImpl extends GenericDaoBase<ManagementServerHostPeerVO, Long> implements ManagementServerHostPeerDao {
    private static final Logger s_logger = Logger.getLogger(ManagementServerHostPeerDaoImpl.class);
    
    private final SearchBuilder<ManagementServerHostPeerVO> ClearPeerSearch;
    private final SearchBuilder<ManagementServerHostPeerVO> FindForUpdateSearch;
    private final SearchBuilder<ManagementServerHostPeerVO> CountSearch;

    public ManagementServerHostPeerDaoImpl() {
        ClearPeerSearch = createSearchBuilder();
        ClearPeerSearch.and("ownerMshost", ClearPeerSearch.entity().getOwnerMshost(), SearchCriteria.Op.EQ);
        ClearPeerSearch.done();
        
        FindForUpdateSearch = createSearchBuilder();
        FindForUpdateSearch.and("ownerMshost", FindForUpdateSearch.entity().getOwnerMshost(), SearchCriteria.Op.EQ);
        FindForUpdateSearch.and("peerMshost", FindForUpdateSearch.entity().getPeerMshost(), SearchCriteria.Op.EQ);
        FindForUpdateSearch.and("peerRunid", FindForUpdateSearch.entity().getPeerRunid(), SearchCriteria.Op.EQ);
        FindForUpdateSearch.done();
        
        CountSearch = createSearchBuilder();
        CountSearch.and("peerMshost", CountSearch.entity().getPeerMshost(), SearchCriteria.Op.EQ);
        CountSearch.and("peerRunid", CountSearch.entity().getPeerRunid(), SearchCriteria.Op.EQ);
        CountSearch.and("peerState", CountSearch.entity().getPeerState(), SearchCriteria.Op.EQ);
        CountSearch.done();
    }
    
    @Override
    @DB
    public void clearPeerInfo(long ownerMshost) {
        SearchCriteria<ManagementServerHostPeerVO>  sc = ClearPeerSearch.create();
        sc.setParameters("ownerMshost", ownerMshost);
        
        expunge(sc);
    }
    
    @Override
    @DB
    public void updatePeerInfo(long ownerMshost, long peerMshost, long peerRunid, ManagementServerHost.State peerState) {
        Transaction txn = Transaction.currentTxn();
        try {
            txn.start();
        
            SearchCriteria<ManagementServerHostPeerVO> sc = FindForUpdateSearch.create();
            sc.setParameters("ownerMshost", ownerMshost);
            sc.setParameters("peerMshost", peerMshost);
            sc.setParameters("peerRunid", peerRunid);
            List<ManagementServerHostPeerVO> l = listBy(sc);
            if(l.size() == 1) {
                ManagementServerHostPeerVO peer = l.get(0);
                peer.setPeerState(peerState);
                update(peer.getId(), peer);
            } else {
                ManagementServerHostPeerVO peer = new ManagementServerHostPeerVO(ownerMshost, peerMshost, peerRunid, peerState);
                persist(peer);
            }
            txn.commit();
        } catch(Exception e) {
            s_logger.warn("Unexpected exception, ", e);
            txn.rollback();
        }
    }
    
    @Override
    @DB
    public int countStateSeenInPeers(long mshost, long runid, ManagementServerHost.State state) {
        SearchCriteria<ManagementServerHostPeerVO> sc = CountSearch.create();
        sc.setParameters("peerMshost", mshost);
        sc.setParameters("peerRunid", runid);
        sc.setParameters("peerState", state);
        
        List<ManagementServerHostPeerVO> l = listBy(sc);
        return l.size();
    }
}
