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/tags/release-0.0.0-rc0/hive/external/ql/src/java/org/apache/hadoop/hive/ql/plan/ConditionalResolver.java

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Java | 43 lines | 8 code | 5 blank | 30 comment | 0 complexity | 0924146289dc90c3a9616140a834e309 MD5 | raw file
 1/**
 2 * Licensed to the Apache Software Foundation (ASF) under one
 3 * or more contributor license agreements.  See the NOTICE file
 4 * distributed with this work for additional information
 5 * regarding copyright ownership.  The ASF licenses this file
 6 * to you under the Apache License, Version 2.0 (the
 7 * "License"); you may not use this file except in compliance
 8 * with the License.  You may obtain a copy of the License at
 9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19package org.apache.hadoop.hive.ql.plan;
20
21import java.io.Serializable;
22import java.util.List;
23
24import org.apache.hadoop.hive.conf.HiveConf;
25import org.apache.hadoop.hive.ql.exec.Task;
26
27/**
28 * Conditional task resolution interface. This is invoked at run time to get the
29 * task to invoke. Developers can plug in their own resolvers.
30 */
31public interface ConditionalResolver {
32  /**
33   * All conditional resolvers implement this interface.
34   *
35   * @param conf
36   *          configuration
37   * @param ctx
38   *          opaque context
39   * @return position of the task
40   */
41  List<Task<? extends Serializable>> getTasks(HiveConf conf, Object ctx);
42
43}