/**
* Copyright (C) 2012 LinkedIn Inc <opensource@linkedin.com>
*
* Licensed 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 com.linkedin.helix.messaging;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
import org.josql.Query;
import org.josql.QueryExecutionException;
import org.josql.QueryParseException;
import org.josql.QueryResults;
import com.linkedin.helix.DataAccessor;
import com.linkedin.helix.HelixManager;
import com.linkedin.helix.Criteria;
import com.linkedin.helix.PropertyType;
import com.linkedin.helix.ZNRecord;
import com.linkedin.helix.Criteria.DataSource;
import com.linkedin.helix.josql.ClusterJosqlQueryProcessor;
import com.linkedin.helix.josql.ZNRecordRow;
public class CriteriaEvaluator
{
private static Logger logger = Logger.getLogger(CriteriaEvaluator.class);
public List<Map<String, String>> evaluateCriteria(Criteria recipientCriteria, HelixManager manager)
{
List<Map<String, String>> selected = new ArrayList<Map<String, String>>();
String queryFields =
(!recipientCriteria.getInstanceName().equals("") ? " " + ZNRecordRow.MAP_SUBKEY : " ''") +","+
(!recipientCriteria.getResource().equals("") ? " " + ZNRecordRow.ZNRECORD_ID : " ''") +","+
(!recipientCriteria.getPartition().equals("") ? " " + ZNRecordRow.MAP_KEY : " ''") +","+
(!recipientCriteria.getPartitionState().equals("") ? " " + ZNRecordRow.MAP_VALUE : " '' ");
String matchCondition =
ZNRecordRow.MAP_SUBKEY + " LIKE '" + (!recipientCriteria.getInstanceName().equals("") ? (recipientCriteria.getInstanceName() +"'") : "%' ") + " AND "+
ZNRecordRow.ZNRECORD_ID+ " LIKE '" + (!recipientCriteria.getResource().equals("") ? (recipientCriteria.getResource() +"'") : "%' ") + " AND "+
ZNRecordRow.MAP_KEY + " LIKE '" + (!recipientCriteria.getPartition().equals("") ? (recipientCriteria.getPartition() +"'") : "%' ") + " AND "+
ZNRecordRow.MAP_VALUE + " LIKE '" + (!recipientCriteria.getPartitionState().equals("") ? (recipientCriteria.getPartitionState()+"'") : "%' ") + " AND "+
ZNRecordRow.MAP_SUBKEY + " IN ((SELECT [*]id FROM :LIVEINSTANCES))";
String queryTarget = recipientCriteria.getDataSource().toString() + ClusterJosqlQueryProcessor.FLATTABLE;
String josql = "SELECT DISTINCT " + queryFields
+ " FROM " + queryTarget + " WHERE "
+ matchCondition;
ClusterJosqlQueryProcessor p = new ClusterJosqlQueryProcessor(manager);
List<Object> result = new ArrayList<Object>();
try
{
logger.info("JOSQL query: " + josql);
result = p.runJoSqlQuery(josql, null, null);
}
catch (Exception e)
{
logger.error("", e);
return selected;
}
for(Object o : result)
{
Map<String, String> resultRow = new HashMap<String, String>();
List<Object> row = (List<Object>)o;
resultRow.put("instanceName", (String)(row.get(0)));
resultRow.put("resourceName", (String)(row.get(1)));
resultRow.put("partitionName", (String)(row.get(2)));
resultRow.put("partitionState", (String)(row.get(3)));
selected.add(resultRow);
}
logger.info("JOSQL query return " + selected.size() + " rows");
return selected;
}
}