/hazelcast/src/main/java/com/hazelcast/merge/MergePolicy.java

https://bitbucket.org/gabral6_gmailcom/hazelcast · Java · 36 lines · 6 code · 5 blank · 25 comment · 0 complexity · 69971d91f58d3acd97d4ec5e8207c090 MD5 · raw file

  1. /*
  2. * Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
  3. *
  4. * Licensed under the Apache License, Version 2.0 (the "License");
  5. * you may not use this file except in compliance with the License.
  6. * You may obtain a copy of the License at
  7. *
  8. * http://www.apache.org/licenses/LICENSE-2.0
  9. *
  10. * Unless required by applicable law or agreed to in writing, software
  11. * distributed under the License is distributed on an "AS IS" BASIS,
  12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13. * See the License for the specific language governing permissions and
  14. * limitations under the License.
  15. */
  16. package com.hazelcast.merge;
  17. import com.hazelcast.core.MapEntry;
  18. public interface MergePolicy {
  19. public static final Object REMOVE_EXISTING = new Object();
  20. /**
  21. * Returns the value of the entry after the merge
  22. * of entries with the same key. Returning value can be
  23. * You should consider the case where existingEntry is null.
  24. *
  25. * @param mapName name of the map
  26. * @param mergingEntry entry merging into the destination cluster
  27. * @param existingEntry existing entry in the destination cluster
  28. * @return final value of the entry. If returns null then no change on the entry.
  29. */
  30. Object merge(String mapName, MapEntry mergingEntry, MapEntry existingEntry);
  31. }