/**
* 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.hadoop.hive.ql.plan;
import java.io.Serializable;
import java.util.List;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.ql.exec.Task;
/**
* Conditional task resolution interface. This is invoked at run time to get the
* task to invoke. Developers can plug in their own resolvers.
*/
public interface ConditionalResolver {
/**
* All conditional resolvers implement this interface.
*
* @param conf
* configuration
* @param ctx
* opaque context
* @return position of the task
*/
List<Task<? extends Serializable>> getTasks(HiveConf conf, Object ctx);
}