ManagerBase.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * 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
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ambari.logsearch.manager;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.google.common.collect.Lists;
import org.apache.ambari.logsearch.common.LogSearchConstants;
import org.apache.ambari.logsearch.model.response.GroupListResponse;
import org.apache.ambari.logsearch.model.response.LogData;
import org.apache.ambari.logsearch.model.response.LogSearchResponse;
import org.apache.ambari.logsearch.dao.SolrDaoBase;
import org.apache.ambari.logsearch.util.SolrUtil;
import org.apache.commons.collections.CollectionUtils;
import org.apache.log4j.Logger;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.response.FacetField;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocumentList;
import org.springframework.data.solr.core.DefaultQueryParser;
import org.springframework.data.solr.core.query.SimpleQuery;
import org.springframework.data.solr.core.query.SolrDataQuery;

import static org.apache.ambari.logsearch.solr.SolrConstants.CommonLogConstants.CLUSTER;

public abstract class ManagerBase<LOG_DATA_TYPE extends LogData, SEARCH_RESPONSE extends LogSearchResponse> extends JsonManagerBase {
  private static final Logger logger = Logger.getLogger(ManagerBase.class);

  public ManagerBase() {
    super();
  }
  
  protected SEARCH_RESPONSE getLastPage(SolrDaoBase solrDoaBase, SimpleQuery lastPageQuery, String event) {
    int maxRows = lastPageQuery.getRows();
    SEARCH_RESPONSE logResponse = getLogAsPaginationProvided(lastPageQuery, solrDoaBase, event);
    Long totalLogs = logResponse.getTotalCount();
    int startIndex = (int)(totalLogs - totalLogs % maxRows);
    int numberOfLogsOnLastPage = (int)(totalLogs - startIndex);
    logResponse.setStartIndex(startIndex);
    logResponse.setTotalCount(totalLogs);
    logResponse.setPageSize(maxRows);
    List<LOG_DATA_TYPE> docList = logResponse.getLogList();
    List<LOG_DATA_TYPE> lastPageDocList = new ArrayList<>();
    logResponse.setLogList(lastPageDocList);
    int cnt = 0;
    for (LOG_DATA_TYPE doc : docList) {
      if (cnt < numberOfLogsOnLastPage) {
        lastPageDocList.add(doc);
      }
      cnt++;
    }
    Collections.reverse(lastPageDocList);
    return logResponse;
  }

  protected SEARCH_RESPONSE getLogAsPaginationProvided(SolrDataQuery solrQuery, SolrDaoBase solrDaoBase, String event) {
    SolrQuery query = new DefaultQueryParser().doConstructSolrQuery(solrQuery);
    return getLogAsPaginationProvided(query, solrDaoBase, event);
  }


  protected SEARCH_RESPONSE getLogAsPaginationProvided(SolrQuery solrQuery, SolrDaoBase solrDaoBase, String event) {
    QueryResponse response = solrDaoBase.process(solrQuery, event);
    SEARCH_RESPONSE logResponse = createLogSearchResponse();
    SolrDocumentList docList = response.getResults();
    logResponse.setTotalCount(docList.getNumFound());
    List<LOG_DATA_TYPE> serviceLogDataList = convertToSolrBeans(response);
    if (!docList.isEmpty()) {
      logResponse.setLogList(serviceLogDataList);
      logResponse.setStartIndex((int) docList.getStart());
      Integer rowNumber = solrQuery.getRows();
      if (rowNumber == null) {
        logger.error("No RowNumber was set in solrQuery");
        return createLogSearchResponse();
      }
      logResponse.setPageSize(rowNumber);
    }
    return logResponse;
  }

  protected abstract List<LOG_DATA_TYPE> convertToSolrBeans(QueryResponse response);

  protected abstract SEARCH_RESPONSE createLogSearchResponse();

  protected List<String> getClusters(SolrDaoBase solrDaoBase, String clusterField, String event) {
    List<String> clusterResponse = Lists.newArrayList();
    SolrQuery solrQuery = new SolrQuery();
    solrQuery.setQuery("*:*");
    SolrUtil.setFacetField(solrQuery, clusterField);
    SolrUtil.setFacetSort(solrQuery, LogSearchConstants.FACET_INDEX);

    QueryResponse response = solrDaoBase.process(solrQuery, event);
    if (response == null) {
      return clusterResponse;
    }
    List<FacetField> clusterFields = response.getFacetFields();
    if (CollectionUtils.isNotEmpty(clusterFields)) {
      FacetField clusterFacets = clusterFields.get(0);
      for (FacetField.Count clusterCount : clusterFacets.getValues()) {
        clusterResponse.add(clusterCount.getName());
      }
    }
    return clusterResponse;
  }

}