Class NoDeletionPolicy
- java.lang.Object
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- org.apache.lucene.index.IndexDeletionPolicy
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- org.apache.lucene.index.NoDeletionPolicy
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- All Implemented Interfaces:
java.lang.Cloneable
public final class NoDeletionPolicy extends IndexDeletionPolicy
AnIndexDeletionPolicy
which keeps all index commits around, never deleting them. This class is a singleton and can be accessed by referencingINSTANCE
.
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Field Summary
Fields Modifier and Type Field Description static IndexDeletionPolicy
INSTANCE
The single instance of this class.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description IndexDeletionPolicy
clone()
void
onCommit(java.util.List<? extends IndexCommit> commits)
This is called each time the writer completed a commit.void
onInit(java.util.List<? extends IndexCommit> commits)
This is called once when a writer is first instantiated to give the policy a chance to remove old commit points.
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Field Detail
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INSTANCE
public static final IndexDeletionPolicy INSTANCE
The single instance of this class.
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Method Detail
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onCommit
public void onCommit(java.util.List<? extends IndexCommit> commits)
Description copied from class:IndexDeletionPolicy
This is called each time the writer completed a commit. This gives the policy a chance to remove old commit points with each commit.
The policy may now choose to delete old commit points by calling method
delete()
ofIndexCommit
.This method is only called when
IndexWriter.commit()
orIndexWriter.close()
is called, or possibly not at all if theIndexWriter.rollback()
is called.Note: the last CommitPoint is the most recent one, i.e. the "front index state". Be careful not to delete it, unless you know for sure what you are doing, and unless you can afford to lose the index content while doing that.
- Specified by:
onCommit
in classIndexDeletionPolicy
- Parameters:
commits
- List ofIndexCommit
, sorted by age (the 0th one is the oldest commit).
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onInit
public void onInit(java.util.List<? extends IndexCommit> commits)
Description copied from class:IndexDeletionPolicy
This is called once when a writer is first instantiated to give the policy a chance to remove old commit points.
The writer locates all index commits present in the index directory and calls this method. The policy may choose to delete some of the commit points, doing so by calling method
delete()
ofIndexCommit
.Note: the last CommitPoint is the most recent one, i.e. the "front index state". Be careful not to delete it, unless you know for sure what you are doing, and unless you can afford to lose the index content while doing that.
- Specified by:
onInit
in classIndexDeletionPolicy
- Parameters:
commits
- List of currentpoint-in-time commits
, sorted by age (the 0th one is the oldest commit). Note that for a new index this method is invoked with an empty list.
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clone
public IndexDeletionPolicy clone()
- Overrides:
clone
in classIndexDeletionPolicy
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