https://github.com/datastax/java-driver/java-driver-core: A driver for Apache Cassandra(R) 2.1+ that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's native protocol versions 3 and above.
  • Various (DataStax) 
/*
 * Copyright DataStax, Inc.
 *
 * 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.
 */

Types related to CQL execution using reactive-style programming.

Note that this is located in a dse package for historical reasons; reactive queries can now be used with open-source Cassandra as well. 
/**
 * Types related to CQL execution using reactive-style programming.
 *
 * <p>Note that this is located in a {@code dse} package for historical reasons; reactive queries
 * can now be used with open-source Cassandra as well.
 */
package com.datastax.dse.driver.api.core.cql.reactive;