Class IndexReplicationHandler

A IReplicationHandler for replication of an index. Implements RevisionReady(String, IDictionary<String, IList<RevisionFile>>, IDictionary<String, IList<String>>, IDictionary<String, Directory>) by copying the files pointed by the client resolver to the index Lucene.Net.Store.Directory and then touches the index with Lucene.Net.Index.IndexWriter to make sure any unused files are deleted.

Inheritance
System.Object
IndexReplicationHandler
Implements
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Replicator
Assembly: Lucene.Net.Replicator.dll
Syntax
public class IndexReplicationHandler : IReplicationHandler
Remarks

NOTE: This handler assumes that Lucene.Net.Index.IndexWriter is not opened by another process on the index directory. In fact, opening an Lucene.Net.Index.IndexWriter on the same directory to which files are copied can lead to undefined behavior, where some or all the files will be deleted, override other files or simply create a mess. When you replicate an index, it is best if the index is never modified by Lucene.Net.Index.IndexWriter, except the one that is open on the source index, from which you replicate.

This handler notifies the application via a provided when an updated index commit was made available for it.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk

Constructors

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IndexReplicationHandler(Directory, Func<Nullable<Boolean>>)

Constructor with the given index directory and callback to notify when the indexes were updated.

Declaration
public IndexReplicationHandler(Directory indexDirectory, Func<bool?> callback)
Parameters
Type Name Description
Lucene.Net.Store.Directory indexDirectory
System.Func<System.Nullable<System.Boolean>> callback

Fields

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INFO_STREAM_COMPONENT

The component used to log messages to the Default Lucene.Net.Util.InfoStream.

Declaration
public const string INFO_STREAM_COMPONENT = "IndexReplicationHandler"
Field Value
Type Description
System.String

Properties

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CurrentRevisionFiles

Declaration
public virtual IDictionary<string, IList<RevisionFile>> CurrentRevisionFiles { get; }
Property Value
Type Description
System.Collections.Generic.IDictionary<System.String, System.Collections.Generic.IList<RevisionFile>>
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CurrentVersion

Declaration
public virtual string CurrentVersion { get; }
Property Value
Type Description
System.String
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InfoStream

Gets or sets the Lucene.Net.Util.InfoStream to use for logging messages.

Declaration
public virtual InfoStream InfoStream { get; set; }
Property Value
Type Description
Lucene.Net.Util.InfoStream

Methods

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CleanupFilesOnFailure(Directory, IList<String>)

Cleanup the index directory by deleting all given files. Called when file copy or sync failed.

Declaration
public static void CleanupFilesOnFailure(Directory directory, IList<string> files)
Parameters
Type Name Description
Lucene.Net.Store.Directory directory
System.Collections.Generic.IList<System.String> files
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CleanupOldIndexFiles(Directory, String)

Cleans up the index directory from old index files. This method uses the last commit found by GetLastCommit(Directory). If it matches the expected segmentsFile, then all files not referenced by this commit point are deleted.

Declaration
public static void CleanupOldIndexFiles(Directory directory, string segmentsFile)
Parameters
Type Name Description
Lucene.Net.Store.Directory directory
System.String segmentsFile
Remarks

NOTE: This method does a best effort attempt to clean the index directory. It suppresses any exceptions that occur, as this can be retried the next time.

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CopyFiles(Directory, Directory, IList<String>)

Copies the provided list of files from the source Lucene.Net.Store.Directory to the target Lucene.Net.Store.Directory, if they are not the same.

Declaration
public static void CopyFiles(Directory source, Directory target, IList<string> files)
Parameters
Type Name Description
Lucene.Net.Store.Directory source
Lucene.Net.Store.Directory target
System.Collections.Generic.IList<System.String> files
Exceptions
Type Condition
System.IO.IOException
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GetLastCommit(Directory)

Returns the last Lucene.Net.Index.IndexCommit found in the Lucene.Net.Store.Directory, or null if there are no commits.

Declaration
public static IndexCommit GetLastCommit(Directory directory)
Parameters
Type Name Description
Lucene.Net.Store.Directory directory
Returns
Type Description
Lucene.Net.Index.IndexCommit
Exceptions
Type Condition
System.IO.IOException
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GetSegmentsFile(IList<String>, Boolean)

Verifies that the last file is segments_N and fails otherwise. It also removes and returns the file from the list, because it needs to be handled last, after all files. This is important in order to guarantee that if a reader sees the new segments_N, all other segment files are already on stable storage.

The reason why the code fails instead of putting segments_N file last is that this indicates an error in the IRevision implementation.

Declaration
public static string GetSegmentsFile(IList<string> files, bool allowEmpty)
Parameters
Type Name Description
System.Collections.Generic.IList<System.String> files
System.Boolean allowEmpty
Returns
Type Description
System.String
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RevisionReady(String, IDictionary<String, IList<RevisionFile>>, IDictionary<String, IList<String>>, IDictionary<String, Directory>)

Declaration
public virtual void RevisionReady(string version, IDictionary<string, IList<RevisionFile>> revisionFiles, IDictionary<string, IList<string>> copiedFiles, IDictionary<string, Directory> sourceDirectory)
Parameters
Type Name Description
System.String version
System.Collections.Generic.IDictionary<System.String, System.Collections.Generic.IList<RevisionFile>> revisionFiles
System.Collections.Generic.IDictionary<System.String, System.Collections.Generic.IList<System.String>> copiedFiles
System.Collections.Generic.IDictionary<System.String, Lucene.Net.Store.Directory> sourceDirectory
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WriteSegmentsGen(String, Directory)

Writes SEGMENTS_GEN file to the directory, reading the generation from the given segmentsFile. If it is null, this method deletes segments.gen from the directory.

Declaration
public static void WriteSegmentsGen(string segmentsFile, Directory directory)
Parameters
Type Name Description
System.String segmentsFile
Lucene.Net.Store.Directory directory

Implements