public final class NoDeletionPolicy extends IndexDeletionPolicy
IndexDeletionPolicy
which keeps all index commits around, never
deleting them. This class is a singleton and can be accessed by referencing
INSTANCE
.Modifier and Type | Field and Description |
---|---|
static IndexDeletionPolicy |
INSTANCE
The single instance of this class.
|
Modifier and Type | Method and Description |
---|---|
IndexDeletionPolicy |
clone() |
void |
onCommit(List<? extends IndexCommit> commits)
This is called each time the writer completed a commit.
|
void |
onInit(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.
|
public static final IndexDeletionPolicy INSTANCE
public void onCommit(List<? extends IndexCommit> commits)
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()
of IndexCommit
.
This method is only called when IndexWriter.commit()
or IndexWriter.close()
is
called, or possibly not at all if the IndexWriter.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.
onCommit
in class IndexDeletionPolicy
commits
- List of IndexCommit
,
sorted by age (the 0th one is the oldest commit).public void onInit(List<? extends IndexCommit> commits)
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()
of IndexCommit
.
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.
onInit
in class IndexDeletionPolicy
commits
- List of current
point-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.public IndexDeletionPolicy clone()
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