Package org.apache.lucene.replicator

Class IndexRevision

java.lang.Object

org.apache.lucene.replicator.IndexRevision

All Implemented Interfaces:

Comparable<Revision>, Revision

public class IndexRevision
extends Object
implements Revision

A Revision of a single index files which comprises the list of files that are part of the current IndexCommit. To ensure the files are not deleted by IndexWriter for as long as this revision stays alive (i.e. until release()), the current commit point is snapshotted, using SnapshotDeletionPolicy (this means that the given writer's config should return SnapshotDeletionPolicy).

When this revision is released, it releases the obtained snapshot as well as calls IndexWriter.deleteUnusedFiles() so that the snapshotted files are deleted (if they are no longer needed).

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

Constructors

Constructor	Description
IndexRevision(IndexWriter writer)	Constructor over the given IndexWriter.

Method Summary

Modifier and Type	Method	Description
int	compareTo(String version)	Compares the revision to the given version string.
int	compareTo(Revision o)
Map<String,List<RevisionFile>>	getSourceFiles()	Returns the files that comprise this revision, as a mapping from a source to a list of files.
String	getVersion()	Returns a string representation of the version of this revision.
InputStream	open(String source, String fileName)	Returns an IndexInput for the given fileName and source.
void	release()	Called when this revision can be safely released, i.e.
static Map<String,List<RevisionFile>>	revisionFiles(IndexCommit commit)	Returns a singleton map of the revision files from the given IndexCommit.
static String	revisionVersion(IndexCommit commit)	Returns a String representation of a revision's version from the given IndexCommit.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexRevision

public IndexRevision(IndexWriter writer)
              throws IOException

Constructor over the given IndexWriter. Uses the last IndexCommit found in the Directory managed by the given writer.

Throws:

IOException

Method Detail

revisionFiles

public static Map<String,List<RevisionFile>> revisionFiles(IndexCommit commit)
                                                          throws IOException

Returns a singleton map of the revision files from the given IndexCommit.

Throws:

IOException

revisionVersion

public static String revisionVersion(IndexCommit commit)

Returns a String representation of a revision's version from the given IndexCommit.

compareTo

public int compareTo(String version)

Description copied from interface: Revision

Compares the revision to the given version string. Behaves like Comparable.compareTo(Object).

Specified by:

compareTo in interface Revision

compareTo

public int compareTo(Revision o)

Specified by:

compareTo in interface Comparable<Revision>

getVersion

public String getVersion()

Description copied from interface: Revision

Returns a string representation of the version of this revision. The version is used by Revision.compareTo(String) as well as to serialize/deserialize revision information. Therefore it must be self descriptive as well as be able to identify one revision from another.

Specified by:

getVersion in interface Revision

getSourceFiles

public Map<String,List<RevisionFile>> getSourceFiles()

Description copied from interface: Revision

Returns the files that comprise this revision, as a mapping from a source to a list of files.

Specified by:

getSourceFiles in interface Revision

open

public InputStream open(String source,
                        String fileName)
                 throws IOException

Description copied from interface: Revision

Returns an IndexInput for the given fileName and source. It is the caller's responsibility to close the IndexInput when it has been consumed.

Specified by:

open in interface Revision

Throws:

IOException

release

public void release()
             throws IOException

Description copied from interface: Revision

Called when this revision can be safely released, i.e. where there are no more references to it.

Specified by:

release in interface Revision

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object