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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
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
  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. package org.apache.hadoop.hive.ql.plan;
  19. import java.io.Serializable;
  20. import java.util.List;
  21. import org.apache.hadoop.hive.conf.HiveConf;
  22. import org.apache.hadoop.hive.ql.exec.Task;
  23. /**
  24. * Conditional task resolution interface. This is invoked at run time to get the
  25. * task to invoke. Developers can plug in their own resolvers.
  26. */
  27. public interface ConditionalResolver {
  28. /**
  29. * All conditional resolvers implement this interface.
  30. *
  31. * @param conf
  32. * configuration
  33. * @param ctx
  34. * opaque context
  35. * @return position of the task
  36. */
  37. List<Task<? extends Serializable>> getTasks(HiveConf conf, Object ctx);
  38. }