Package org.apache.lucene.index

Class SegmentInfos.FindSegmentsFile<T>

java.lang.Object

org.apache.lucene.index.SegmentInfos.FindSegmentsFile<T>

Enclosing class:

SegmentInfos

public abstract static class SegmentInfos.FindSegmentsFile<T>
extends Object

Utility class for executing code that needs to do something with the current segments file. This is necessary with lock-less commits because from the time you locate the current segments file name, until you actually open it, read its contents, or check modified time, etc., it could have been deleted due to a writer commit finishing.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FindSegmentsFile(Directory directory)	Sole constructor.

Method Summary

Modifier and Type	Method	Description
protected abstract T	doBody(String segmentFileName)	Subclass must implement this.
T	run()	Locate the most recent segments file and run doBody(java.lang.String) on it.
T	run(IndexCommit commit)	Run doBody(java.lang.String) on the provided commit.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

FindSegmentsFile

protected FindSegmentsFile(Directory directory)

Sole constructor.

Method Details

run

public T run()
      throws IOException

Locate the most recent segments file and run doBody(java.lang.String) on it.

Throws:

IOException

run

public T run(IndexCommit commit)
      throws IOException

Run doBody(java.lang.String) on the provided commit.

Throws:

IOException

doBody

protected abstract T doBody(String segmentFileName)
                     throws IOException

Subclass must implement this. The assumption is an IOException will be thrown if something goes wrong during the processing that could have been caused by a writer committing.

Throws:

IOException