private DirectoryReader DoOpenNoWriter(IndexCommit commit)
{
if (commit == null)
{
if (IsCurrent())
{
return(null);
}
}
else
{
if (m_directory != commit.Directory)
{
throw new IOException("the specified commit does not match the specified Directory");
}
if (segmentInfos != null && commit.SegmentsFileName.Equals(segmentInfos.GetSegmentsFileName(), StringComparison.Ordinal))
{
return(null);
}
}
return(DoOpenFromCommit(commit));
}
private DirectoryReader DoOpenFromWriter(IndexCommit commit)
{
if (commit != null)
{
return(DoOpenFromCommit(commit));
}
if (writer.NrtIsCurrent(segmentInfos))
{
return(null);
}
DirectoryReader reader = writer.GetReader(applyAllDeletes);
// If in fact no changes took place, return null:
if (reader.Version == segmentInfos.Version)
{
reader.DecRef();
return(null);
}
return(reader);
}
/// <summary>
/// Increments the refCount for this <see cref="IndexCommit"/>. </summary>
protected internal virtual void IncRef(IndexCommit ic)
{
UninterruptableMonitor.Enter(this);
try
{
long gen = ic.Generation;
int refCountInt;
if (!m_refCounts.TryGetValue(gen, out int refCount))
{
m_indexCommits[gen] = m_lastCommit;
refCountInt = 0;
}
else
{
refCountInt = refCount;
}
m_refCounts[gen] = refCountInt + 1;
}
finally
{
UninterruptableMonitor.Exit(this);
}
}
public override void OnInit <T>(IList <T> commits)
{
UninterruptableMonitor.Enter(this);
try
{
initCalled = true;
primary.OnInit(WrapCommits(commits));
foreach (IndexCommit commit in commits)
{
if (m_refCounts.ContainsKey(commit.Generation))
{
m_indexCommits[commit.Generation] = commit;
}
}
if (commits.Count > 0)
{
m_lastCommit = commits[commits.Count - 1];
}
}
finally
{
UninterruptableMonitor.Exit(this);
}
}
protected internal override sealed DirectoryReader DoOpenIfChanged(IndexCommit commit)
{
return(WrapDirectoryReader(m_input.DoOpenIfChanged(commit)));
}
/// <summary> /// Implement this method to support <see cref="OpenIfChanged(DirectoryReader, IndexCommit)"/>. /// If this reader does not support reopen from a specific <see cref="Index.IndexCommit"/>, /// throw <see cref="NotSupportedException"/>. </summary> /// <exception cref="IOException"> if there is a low-level IO error </exception> /// <returns> <c>null</c> if there are no changes; else, a new /// <see cref="DirectoryReader"/> instance. </returns> protected internal abstract DirectoryReader DoOpenIfChanged(IndexCommit commit);
/// <summary>
/// Expert: returns an <see cref="IndexReader"/> reading the index in the given
/// <seealso cref="Index.IndexCommit"/> and <paramref name="termInfosIndexDivisor"/>. </summary>
/// <param name="commit"> the commit point to open </param>
/// <param name="termInfosIndexDivisor"> Subsamples which indexed
/// terms are loaded into RAM. this has the same effect as setting
/// <see cref="LiveIndexWriterConfig.TermIndexInterval"/> (on <see cref="IndexWriterConfig"/>) except that setting
/// must be done at indexing time while this setting can be
/// set per reader. When set to N, then one in every
/// N*termIndexInterval terms in the index is loaded into
/// memory. By setting this to a value > 1 you can reduce
/// memory usage, at the expense of higher latency when
/// loading a TermInfo. The default value is 1. Set this
/// to -1 to skip loading the terms index entirely.
/// <b>NOTE:</b> divisor settings > 1 do not apply to all <see cref="Codecs.PostingsFormat"/>
/// implementations, including the default one in this release. It only makes
/// sense for terms indexes that can efficiently re-sample terms at load time. </param>
/// <exception cref="IOException"> if there is a low-level IO error </exception>
new public static DirectoryReader Open(IndexCommit commit, int termInfosIndexDivisor)
{
return(StandardDirectoryReader.Open(commit.Directory, commit, termInfosIndexDivisor));
}
/// <summary>
/// Expert: returns an <see cref="IndexReader"/> reading the index in the given
/// <see cref="Index.IndexCommit"/>. </summary>
/// <param name="commit"> the commit point to open </param>
/// <exception cref="IOException"> if there is a low-level IO error </exception>
new public static DirectoryReader Open(IndexCommit commit)
{
return(StandardDirectoryReader.Open(commit.Directory, commit, DEFAULT_TERMS_INDEX_DIVISOR));
}
/// <summary>
/// Creates a <see cref="SnapshotCommitPoint"/> wrapping the provided
/// <see cref="IndexCommit"/>.
/// </summary>
protected internal SnapshotCommitPoint(SnapshotDeletionPolicy outerInstance, IndexCommit cp)
{
this.outerInstance = outerInstance;
this.m_cp = cp;
}
public static DirectoryReader Open(IndexCommit commit)
{
return(DirectoryReader.Open(commit));
}
/// <summary>
/// called from <c>DirectoryReader.Open(...)</c> methods </summary>
internal static DirectoryReader Open(Directory directory, IndexCommit commit, int termInfosIndexDivisor)
{
return((DirectoryReader) new FindSegmentsFileAnonymousInnerClassHelper(directory, termInfosIndexDivisor).Run(commit));
}
private DirectoryReader DoOpenFromCommit(IndexCommit commit)
{
return((DirectoryReader) new FindSegmentsFileAnonymousInnerClassHelper2(this, m_directory).Run(commit));
}
