/**
 * This software is licensed to you under the Apache License, Version 2.0 (the
 * "Apache License").
 *
 * LinkedIn's contributions are made under the Apache License. If you contribute
 * to the Software, the contributions will be deemed to have been made under the
 * Apache License, unless you expressly indicate otherwise. Please do not make any
 * contributions that would be inconsistent with the Apache License.
 *
 * You may obtain a copy of the Apache License at http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, this software
 * distributed under the Apache License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Apache
 * License for the specific language governing permissions and limitations for the
 * software governed under the Apache License.
 *
 * © 2012 LinkedIn Corp. All Rights Reserved.  
 */
package com.senseidb.search.node;

import java.util.Comparator;
import java.util.List;
import java.util.Set;

import org.apache.log4j.Logger;

import com.google.protobuf.Message;
import com.linkedin.norbert.javacompat.cluster.Node;
import com.senseidb.search.req.SenseiRequest;
import com.senseidb.search.req.SenseiSystemInfo;

public class SenseiSysScatterGatherHandler extends AbstractSenseiScatterGatherHandler<SenseiRequest, SenseiSystemInfo>
{

  private final static Logger logger = Logger.getLogger(SenseiSysScatterGatherHandler.class);

  private final Comparator<String> _versionComparator;

  public SenseiSysScatterGatherHandler(SenseiRequest request, Comparator<String> versionComparator, long timeoutMillis)
  {
      super(request, timeoutMillis);
      _versionComparator = versionComparator;
  }

  @Override
  public SenseiRequest customizeRequest(SenseiRequest senseiRequest, Node node, Set<Integer> partitions) {
    senseiRequest.setPartitions(partitions);
    return senseiRequest;
  }

  @Override
  public SenseiSystemInfo mergeResults(SenseiRequest request, List<SenseiSystemInfo> resultList)
  {
    SenseiSystemInfo result = new SenseiSystemInfo();
    if (resultList == null)
      return result;

    for (SenseiSystemInfo res : resultList)
    {
      result.setNumDocs(result.getNumDocs()+res.getNumDocs());
      if (result.getLastModified() < res.getLastModified())
        result.setLastModified(res.getLastModified());
      if (result.getVersion() == null || _versionComparator.compare(result.getVersion(), res.getVersion()) < 0)
        result.setVersion(res.getVersion());
      if (res.getFacetInfos() != null)
        result.setFacetInfos(res.getFacetInfos());
      if (res.getClusterInfo() != null) {
        if (result.getClusterInfo() != null)
          result.getClusterInfo().addAll(res.getClusterInfo());
        else
          result.setClusterInfo(res.getClusterInfo());
      }
    }

    return result;
  }
}