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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.be.dao.cassandra;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Session;
import com.datastax.driver.core.Statement;
import com.datastax.driver.core.querybuilder.QueryBuilder;
import com.datastax.driver.mapping.MappingManager;
import fj.data.Either;
public abstract class CassandraDao {
private static Logger logger = LoggerFactory.getLogger(CassandraDao.class.getName());
protected Session session;
protected MappingManager manager;
@Autowired
protected CassandraClient client;
/**
* the method checks if the given table is empty under the keyspace the
* session was opened to.
*
* @param tableName
* the name of the table we want to check
* @return returns true if the table was empty
*/
protected Either<Boolean, CassandraOperationStatus> isTableEmpty(String tableName) {
Statement select = QueryBuilder.select().countAll().from(tableName).limit(10);
try {
ResultSet res = session.execute(select);
return Either.left((res.one().getLong("count") != 0 ? false : true));
} catch (Exception e) {
logger.debug("Failed check if table is empty", e);
return Either.right(CassandraOperationStatus.GENERAL_ERROR);
}
}
}
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