Expert: represents a single commit into an index as seen by the {@link IndexDeletionPolicy} or {@link IndexReader}.

Changes to the content of an index are made visible only after the writer who made that change commits by writing a new segments file (segments_N). This point in time, when the action of writing of a new segments file to the directory is completed, is an index commit.

Each index commit point has a unique segments file associated with it. The segments file associated with a later index commit point would have a larger N.

WARNING: This API is a new and experimental and may suddenly change.

Inheritance: IndexCommitPoint
Exemplo n.º 1
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        public virtual void OnCommit(IList<IndexCommit> commits)
		{
			lock (this)
			{
				primary.OnCommit(WrapCommits(commits));
				lastCommit = commits[commits.Count - 1];
			}
		}
 public virtual void OnInit(List<IndexCommitPoint> commits)
 {
     lock (this)
     {
         primary.OnInit(WrapCommits(commits));
         lastCommit = (IndexCommit)(commits[commits.Count - 1]);
     }
 }
Exemplo n.º 3
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		public virtual void  OnCommit(System.Collections.IList commits)
		{
			lock (this)
			{
				primary.OnCommit(WrapCommits(commits));
				lastCommit = (IndexCommit) commits[commits.Count - 1];
			}
		}
Exemplo n.º 4
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		public override IndexReader Reopen(IndexCommit commit)
		{
			EnsureOpen();
			IndexReader r = in_Renamed.Reopen(commit);
			if (r != in_Renamed)
				return new DirectoryOwningReader(r, ref_Renamed);
			return this;
		}
 protected internal virtual void CheckMaxDoc(IndexCommit commit, int expectedMaxDoc)
 {
     IndexReader reader = DirectoryReader.Open(commit);
     try
     {
         Assert.AreEqual(expectedMaxDoc, reader.MaxDoc);
     }
     finally
     {
         reader.Dispose();
     }
 }
        public virtual void TestMultiThreadedSnapshotting()
        {
            Directory dir = NewDirectory();
            IndexWriter writer = new IndexWriter(dir, GetConfig(Random(), DeletionPolicy));
            SnapshotDeletionPolicy sdp = (SnapshotDeletionPolicy)writer.Config.DelPolicy;

            ThreadClass[] threads = new ThreadClass[10];
            IndexCommit[] snapshots = new IndexCommit[threads.Length];
            for (int i = 0; i < threads.Length; i++)
            {
                int finalI = i;
                threads[i] = new ThreadAnonymousInnerClassHelper2(this, writer, sdp, snapshots, finalI);
                threads[i].Name = "t" + i;
            }

            foreach (ThreadClass t in threads)
            {
                t.Start();
            }

            foreach (ThreadClass t in threads)
            {
                t.Join();
            }

            // Do one last commit, so that after we release all snapshots, we stay w/ one commit
            writer.AddDocument(new Document());
            writer.Commit();

            for (int i = 0; i < threads.Length; i++)
            {
                sdp.Release(snapshots[i]);
                writer.DeleteUnusedFiles();
            }
            Assert.AreEqual(1, DirectoryReader.ListCommits(dir).Count);
            writer.Dispose();
            dir.Dispose();
        }
 protected internal virtual void CheckSnapshotExists(Directory dir, IndexCommit c)
 {
     string segFileName = c.SegmentsFileName;
     Assert.IsTrue(SlowFileExists(dir, segFileName), "segments file not found in directory: " + segFileName);
 }
        internal static DirectoryIndexReader Open(Directory directory, bool closeDirectory, IndexDeletionPolicy deletionPolicy, IndexCommit commit, bool readOnly)
        {
            SegmentInfos.FindSegmentsFile finder = new AnonymousClassFindSegmentsFile(closeDirectory, deletionPolicy, directory, readOnly);

            if (commit == null)
                return (DirectoryIndexReader) finder.Run();
            else
            {
                if (directory != commit.GetDirectory())
                    throw new System.IO.IOException("the specified commit does not match the specified Directory");
                // this can and will directly throw IOException if the specified commit point has been deleted
                return (DirectoryIndexReader)finder.DoBody(commit.GetSegmentsFileName());
            }
        }
Exemplo n.º 9
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			public System.Object Run(IndexCommit commit)
			{
				if (commit != null)
				{
					if (directory != commit.GetDirectory())
						throw new System.IO.IOException("the specified commit does not match the specified Directory");
					return DoBody(commit.GetSegmentsFileName());
				}
				
				System.String segmentFileName = null;
				long lastGen = - 1;
				long gen = 0;
				int genLookaheadCount = 0;
				System.IO.IOException exc = null;
				bool retry = false;
				
				int method = 0;
				
				// Loop until we succeed in calling doBody() without
				// hitting an IOException.  An IOException most likely
				// means a commit was in process and has finished, in
				// the time it took us to load the now-old infos files
				// (and segments files).  It's also possible it's a
				// true error (corrupt index).  To distinguish these,
				// on each retry we must see "forward progress" on
				// which generation we are trying to load.  If we
				// don't, then the original error is real and we throw
				// it.
				
				// We have three methods for determining the current
				// generation.  We try the first two in parallel, and
				// fall back to the third when necessary.
				
				while (true)
				{
					
					if (0 == method)
					{
						
						// Method 1: list the directory and use the highest
						// segments_N file.  This method works well as long
						// as there is no stale caching on the directory
						// contents (NOTE: NFS clients often have such stale
						// caching):
						System.String[] files = null;
						
						long genA = - 1;
						
						files = directory.ListAll();
						
						if (files != null)
							genA = Lucene.Net.Index.SegmentInfos.GetCurrentSegmentGeneration(files);
						
						Lucene.Net.Index.SegmentInfos.Message("directory listing genA=" + genA);
						
						// Method 2: open segments.gen and read its
						// contents.  Then we take the larger of the two
						// gen's.  This way, if either approach is hitting
						// a stale cache (NFS) we have a better chance of
						// getting the right generation.
						long genB = - 1;
						for (int i = 0; i < Lucene.Net.Index.SegmentInfos.defaultGenFileRetryCount; i++)
						{
							IndexInput genInput = null;
							try
							{
								genInput = directory.OpenInput(IndexFileNames.SEGMENTS_GEN);
							}
							catch (System.IO.FileNotFoundException e)
							{
								Lucene.Net.Index.SegmentInfos.Message("segments.gen open: FileNotFoundException " + e);
								break;
							}
							catch (System.IO.IOException e)
							{
								Lucene.Net.Index.SegmentInfos.Message("segments.gen open: IOException " + e);
							}
							
							if (genInput != null)
							{
								try
								{
									int version = genInput.ReadInt();
									if (version == Lucene.Net.Index.SegmentInfos.FORMAT_LOCKLESS)
									{
										long gen0 = genInput.ReadLong();
										long gen1 = genInput.ReadLong();
										Lucene.Net.Index.SegmentInfos.Message("fallback check: " + gen0 + "; " + gen1);
										if (gen0 == gen1)
										{
											// The file is consistent.
											genB = gen0;
											break;
										}
									}
								}
								catch (System.IO.IOException err2)
								{
									// will retry
								}
								finally
								{
									genInput.Close();
								}
							}
							try
							{
								System.Threading.Thread.Sleep(new System.TimeSpan((System.Int64) 10000 * Lucene.Net.Index.SegmentInfos.defaultGenFileRetryPauseMsec));
							}
							catch (System.Threading.ThreadInterruptedException ie)
							{
								// In 3.0 we will change this to throw
								// InterruptedException instead
								SupportClass.ThreadClass.Current().Interrupt();
								throw new System.SystemException(ie.Message, ie);
							}
						}
						
						Lucene.Net.Index.SegmentInfos.Message(IndexFileNames.SEGMENTS_GEN + " check: genB=" + genB);
						
						// Pick the larger of the two gen's:
						if (genA > genB)
							gen = genA;
						else
							gen = genB;
						
						if (gen == - 1)
						{
							// Neither approach found a generation
							System.String s;
							if (files != null)
							{
								s = "";
								for (int i = 0; i < files.Length; i++)
									s += (" " + files[i]);
							}
							else
								s = " null";
							throw new System.IO.FileNotFoundException("no segments* file found in " + directory + ": files:" + s);
						}
					}
					
					// Third method (fallback if first & second methods
					// are not reliable): since both directory cache and
					// file contents cache seem to be stale, just
					// advance the generation.
					if (1 == method || (0 == method && lastGen == gen && retry))
					{
						
						method = 1;
						
						if (genLookaheadCount < Lucene.Net.Index.SegmentInfos.defaultGenLookaheadCount)
						{
							gen++;
							genLookaheadCount++;
							Lucene.Net.Index.SegmentInfos.Message("look ahead increment gen to " + gen);
						}
					}
					
					if (lastGen == gen)
					{
						
						// This means we're about to try the same
						// segments_N last tried.  This is allowed,
						// exactly once, because writer could have been in
						// the process of writing segments_N last time.
						
						if (retry)
						{
							// OK, we've tried the same segments_N file
							// twice in a row, so this must be a real
							// error.  We throw the original exception we
							// got.
							throw exc;
						}
						else
						{
							retry = true;
						}
					}
					else if (0 == method)
					{
						// Segment file has advanced since our last loop, so
						// reset retry:
						retry = false;
					}
					
					lastGen = gen;
					
					segmentFileName = IndexFileNames.FileNameFromGeneration(IndexFileNames.SEGMENTS, "", gen);
					
					try
					{
						System.Object v = DoBody(segmentFileName);
						if (exc != null)
						{
							Lucene.Net.Index.SegmentInfos.Message("success on " + segmentFileName);
						}
						return v;
					}
					catch (System.IO.IOException err)
					{
						
						// Save the original root cause:
						if (exc == null)
						{
							exc = err;
						}
						
						Lucene.Net.Index.SegmentInfos.Message("primary Exception on '" + segmentFileName + "': " + err + "'; will retry: retry=" + retry + "; gen = " + gen);
						
						if (!retry && gen > 1)
						{
							
							// This is our first time trying this segments
							// file (because retry is false), and, there is
							// possibly a segments_(N-1) (because gen > 1).
							// So, check if the segments_(N-1) exists and
							// try it if so:
							System.String prevSegmentFileName = IndexFileNames.FileNameFromGeneration(IndexFileNames.SEGMENTS, "", gen - 1);
							
							bool prevExists;
							prevExists = directory.FileExists(prevSegmentFileName);
							
							if (prevExists)
							{
								Lucene.Net.Index.SegmentInfos.Message("fallback to prior segment file '" + prevSegmentFileName + "'");
								try
								{
									System.Object v = DoBody(prevSegmentFileName);
									if (exc != null)
									{
										Lucene.Net.Index.SegmentInfos.Message("success on fallback " + prevSegmentFileName);
									}
									return v;
								}
								catch (System.IO.IOException err2)
								{
									Lucene.Net.Index.SegmentInfos.Message("secondary Exception on '" + prevSegmentFileName + "': " + err2 + "'; will retry");
								}
							}
						}
					}
				}
			}
Exemplo n.º 10
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 internal static IndexReader Open(Directory directory, IndexDeletionPolicy deletionPolicy, IndexCommit commit, bool readOnly, int termInfosIndexDivisor)
 {
     return (IndexReader) new AnonymousClassFindSegmentsFile(readOnly, deletionPolicy, termInfosIndexDivisor, directory).Run(commit);
 }
 /// <summary>
 /// Deletes a snapshotted commit. Once this method returns, the snapshot
 /// information is persisted in the directory.
 /// </summary>
 /// <seealso cref= SnapshotDeletionPolicy#release </seealso>
 public override void Release(IndexCommit commit)
 {
     lock (this)
     {
         base.Release(commit);
         bool success = false;
         try
         {
             Persist();
             success = true;
         }
         finally
         {
             if (!success)
             {
                 try
                 {
                     IncRef(commit);
                 }
                 catch (Exception e)
                 {
                     // Suppress so we keep throwing original exception
                 }
             }
         }
     }
 }
Exemplo n.º 12
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		public static IndexReader Open(IndexCommit commit)
		{
			return Open(commit.GetDirectory(), null, commit, false, DEFAULT_TERMS_INDEX_DIVISOR);
		}
Exemplo n.º 13
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 /// <summary>
 /// Expert: allows to open a certain commit point. The default is null which
 /// opens the latest commit point.
 ///
 /// <p>Only takes effect when IndexWriter is first created.
 /// </summary>
 public IndexWriterConfig SetIndexCommit(IndexCommit commit)
 {
     this.Commit = commit;
     return this;
 }
Exemplo n.º 14
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        private IndexReader DoReopenNoWriter(bool openReadOnly, IndexCommit commit)
        {
            lock (this)
            {
                if (commit == null)
                {
                    if (hasChanges)
                    {
                        // We have changes, which means we are not readOnly:
                        System.Diagnostics.Debug.Assert(readOnly == false);
                        // and we hold the write lock:
                        System.Diagnostics.Debug.Assert(writeLock != null);
                        // so no other writer holds the write lock, which
                        // means no changes could have been done to the index:
                        System.Diagnostics.Debug.Assert(IsCurrent());

                        if (openReadOnly)
                        {
                            return Clone(openReadOnly);
                        }
                        else
                        {
                            return this;
                        }
                    }
                    else if (IsCurrent())
                    {
                        if (openReadOnly != readOnly)
                        {
                            // Just fallback to clone
                            return Clone(openReadOnly);
                        }
                        else
                        {
                            return this;
                        }
                    }
                }
                else
                {
                    if (internalDirectory != commit.Directory)
                        throw new System.IO.IOException("the specified commit does not match the specified Directory");
                    if (segmentInfos != null && commit.SegmentsFileName.Equals(segmentInfos.GetCurrentSegmentFileName()))
                    {
                        if (readOnly != openReadOnly)
                        {
                            // Just fallback to clone
                            return Clone(openReadOnly);
                        }
                        else
                        {
                            return this;
                        }
                    }
                }

                return (IndexReader)new AnonymousFindSegmentsFile(internalDirectory, openReadOnly, this).Run(commit);
            }
        }
Exemplo n.º 15
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 protected internal override sealed DirectoryReader DoOpenIfChanged(IndexCommit commit)
 {
     return WrapDirectoryReader(@in.DoOpenIfChanged(commit));
 }
Exemplo n.º 16
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        internal virtual IndexReader DoReopen(bool openReadOnly, IndexCommit commit)
        {
            EnsureOpen();

            System.Diagnostics.Debug.Assert(commit == null || openReadOnly);

            // If we were obtained by writer.getReader(), re-ask the
            // writer to get a new reader.
            if (writer != null)
            {
                return DoReopenFromWriter(openReadOnly, commit);
            }
            else
            {
                return DoReopenNoWriter(openReadOnly, commit);
            }
        }
Exemplo n.º 17
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        private IndexReader DoReopenFromWriter(bool openReadOnly, IndexCommit commit)
        {
            System.Diagnostics.Debug.Assert(readOnly);

            if (!openReadOnly)
            {
                throw new System.ArgumentException("a reader obtained from IndexWriter.getReader() can only be reopened with openReadOnly=true (got false)");
            }

            if (commit != null)
            {
                throw new System.ArgumentException("a reader obtained from IndexWriter.getReader() cannot currently accept a commit");
            }

            // TODO: right now we *always* make a new reader; in
            // the future we could have write make some effort to
            // detect that no changes have occurred
            return writer.GetReader();
        }
Exemplo n.º 18
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 public override IndexReader Reopen(IndexCommit commit)
 {
     return DoReopen(true, commit);
 }
 private void CopyFiles(Directory dir, IndexCommit cp)
 {
     // While we hold the snapshot, and nomatter how long
     // we take to do the backup, the IndexWriter will
     // never delete the files in the snapshot:
     ICollection<string> files = cp.FileNames;
     foreach (String fileName in files)
     {
         // NOTE: in a real backup you would not use
         // readFile; you would need to use something else
         // that copies the file to a backup location.  this
         // could even be a spawned shell process (eg "tar",
         // "zip") that takes the list of files and builds a
         // backup.
         ReadFile(dir, fileName);
     }
 }
Exemplo n.º 20
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		/// <summary>Expert: returns an IndexReader reading the index in
		/// the given Directory, using a specific commit and with
		/// a custom {@link IndexDeletionPolicy}.  You should pass
		/// readOnly=true, since it gives much better concurrent
		/// performance, unless you intend to do write operations
		/// (delete documents or change norms) with the reader.
		/// </summary>
		/// <param name="commit">the specific {@link IndexCommit} to open;
		/// see {@link IndexReader#listCommits} to list all commits
		/// in a directory
		/// </param>
		/// <param name="deletionPolicy">a custom deletion policy (only used
		/// if you use this reader to perform deletes or to set
		/// norms); see {@link IndexWriter} for details.
		/// </param>
		/// <param name="readOnly">true if no changes (deletions, norms) will be made with this IndexReader
		/// </param>
		/// <throws>  CorruptIndexException if the index is corrupt </throws>
		/// <throws>  IOException if there is a low-level IO error </throws>
		public static IndexReader Open(IndexCommit commit, IndexDeletionPolicy deletionPolicy, bool readOnly)
		{
			return Open(commit.GetDirectory(), deletionPolicy, commit, readOnly, DEFAULT_TERMS_INDEX_DIVISOR);
		}
 public ThreadAnonymousInnerClassHelper2(TestSnapshotDeletionPolicy outerInstance, IndexWriter writer, SnapshotDeletionPolicy sdp, IndexCommit[] snapshots, int finalI)
 {
     this.OuterInstance = outerInstance;
     this.Writer = writer;
     this.Sdp = sdp;
     this.Snapshots = snapshots;
     this.FinalI = finalI;
 }
Exemplo n.º 22
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		private static IndexReader Open(Directory directory, IndexDeletionPolicy deletionPolicy, IndexCommit commit, bool readOnly, int termInfosIndexDivisor)
		{
			return DirectoryReader.Open(directory, deletionPolicy, commit, readOnly, termInfosIndexDivisor);
		}
Exemplo n.º 23
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		/// <summary> Expert: constructs an IndexWriter with a custom {@link
		/// IndexDeletionPolicy} and {@link IndexingChain}, 
		/// for the index in <code>d</code>.
		/// Text will be analyzed with <code>a</code>.  If
		/// <code>create</code> is true, then a new, empty index
		/// will be created in <code>d</code>, replacing the index
		/// already there, if any.
		/// 
		/// <p/><b>NOTE</b>: autoCommit (see <a
		/// href="#autoCommit">above</a>) is set to false with this
		/// constructor.
		/// 
		/// </summary>
		/// <param name="d">the index directory
		/// </param>
		/// <param name="a">the analyzer to use
		/// </param>
		/// <param name="create"><code>true</code> to create the index or overwrite
		/// the existing one; <code>false</code> to append to the existing
		/// index
		/// </param>
		/// <param name="deletionPolicy">see <a href="#deletionPolicy">above</a>
		/// </param>
		/// <param name="mfl">whether or not to limit field lengths, value is in number of terms/tokens.  See {@link Lucene.Net.Index.IndexWriter.MaxFieldLength}.
		/// </param>
		/// <param name="indexingChain">the {@link DocConsumer} chain to be used to 
		/// process documents
		/// </param>
		/// <param name="commit">which commit to open
		/// </param>
		/// <throws>  CorruptIndexException if the index is corrupt </throws>
		/// <throws>  LockObtainFailedException if another writer </throws>
		/// <summary>  has this index open (<code>write.lock</code> could not
		/// be obtained)
		/// </summary>
		/// <throws>  IOException if the directory cannot be read/written to, or </throws>
		/// <summary>  if it does not exist and <code>create</code> is
		/// <code>false</code> or if there is any other low-level
		/// IO error
		/// </summary>
		internal IndexWriter(Directory d, Analyzer a, bool create, IndexDeletionPolicy deletionPolicy, MaxFieldLength mfl, IndexingChain indexingChain, IndexCommit commit)
		{
			InitBlock();
			Init(d, a, create, false, deletionPolicy, false, mfl.GetLimit(), indexingChain, commit);
		}
 internal MyCommitPoint(SnapshotDeletionPolicy enclosingInstance, IndexCommit cp)
 {
     InitBlock(enclosingInstance);
     this.cp = cp;
 }
Exemplo n.º 25
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		/// <summary>Expert: returns an IndexReader reading the index in the given
		/// {@link IndexCommit}.  You should pass readOnly=true, since it
		/// gives much better concurrent performance, unless you
		/// intend to do write operations (delete documents or
		/// change norms) with the reader.
		/// </summary>
		/// <param name="commit">the commit point to open
		/// </param>
		/// <param name="readOnly">true if no changes (deletions, norms) will be made with this IndexReader
		/// </param>
		/// <throws>  CorruptIndexException if the index is corrupt </throws>
		/// <throws>  IOException if there is a low-level IO error </throws>
		public static IndexReader Open(IndexCommit commit, bool readOnly)
		{
			return Open(commit.GetDirectory(), null, commit, readOnly, DEFAULT_TERMS_INDEX_DIVISOR);
		}
Exemplo n.º 26
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		/// <summary> Expert: constructs an IndexWriter on specific commit
		/// point, with a custom {@link IndexDeletionPolicy}, for
		/// the index in <code>d</code>.  Text will be analyzed
		/// with <code>a</code>.
		/// 
		/// <p/> This is only meaningful if you've used a {@link
		/// IndexDeletionPolicy} in that past that keeps more than
		/// just the last commit.
		/// 
		/// <p/>This operation is similar to {@link #Rollback()},
		/// except that method can only rollback what's been done
		/// with the current instance of IndexWriter since its last
		/// commit, whereas this method can rollback to an
		/// arbitrary commit point from the past, assuming the
		/// {@link IndexDeletionPolicy} has preserved past
		/// commits.
		/// 
		/// <p/><b>NOTE</b>: autoCommit (see <a
		/// href="#autoCommit">above</a>) is set to false with this
		/// constructor.
		/// 
		/// </summary>
		/// <param name="d">the index directory
		/// </param>
		/// <param name="a">the analyzer to use
		/// </param>
		/// <param name="deletionPolicy">see <a href="#deletionPolicy">above</a>
		/// </param>
		/// <param name="mfl">whether or not to limit field lengths, value is in number of terms/tokens.  See {@link Lucene.Net.Index.IndexWriter.MaxFieldLength}.
		/// </param>
		/// <param name="commit">which commit to open
		/// </param>
		/// <throws>  CorruptIndexException if the index is corrupt </throws>
		/// <throws>  LockObtainFailedException if another writer </throws>
		/// <summary>  has this index open (<code>write.lock</code> could not
		/// be obtained)
		/// </summary>
		/// <throws>  IOException if the directory cannot be read/written to, or </throws>
		/// <summary>  if it does not exist and <code>create</code> is
		/// <code>false</code> or if there is any other low-level
		/// IO error
		/// </summary>
		public IndexWriter(Directory d, Analyzer a, IndexDeletionPolicy deletionPolicy, MaxFieldLength mfl, IndexCommit commit)
		{
			InitBlock();
			Init(d, a, false, false, deletionPolicy, false, mfl.GetLimit(), null, commit);
		}
Exemplo n.º 27
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		/// <summary>Expert: returns an IndexReader reading the index in
		/// the given Directory, using a specific commit and with
		/// a custom {@link IndexDeletionPolicy}.  You should pass
		/// readOnly=true, since it gives much better concurrent
		/// performance, unless you intend to do write operations
		/// (delete documents or change norms) with the reader.
		/// </summary>
		/// <param name="commit">the specific {@link IndexCommit} to open;
		/// see {@link IndexReader#listCommits} to list all commits
		/// in a directory
		/// </param>
		/// <param name="deletionPolicy">a custom deletion policy (only used
		/// if you use this reader to perform deletes or to set
		/// norms); see {@link IndexWriter} for details.
		/// </param>
		/// <param name="readOnly">true if no changes (deletions, norms) will be made with this IndexReader
		/// </param>
		/// <param name="termInfosIndexDivisor">Subsambles which indexed
		/// terms are loaded into RAM. This has the same effect as {@link
		/// IndexWriter#setTermIndexInterval} 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.
		/// </param>
		/// <throws>  CorruptIndexException if the index is corrupt </throws>
		/// <throws>  IOException if there is a low-level IO error </throws>
		public static IndexReader Open(IndexCommit commit, IndexDeletionPolicy deletionPolicy, bool readOnly, int termInfosIndexDivisor)
		{
			return Open(commit.GetDirectory(), deletionPolicy, commit, readOnly, termInfosIndexDivisor);
		}
Exemplo n.º 28
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		private void  Init(Directory d, Analyzer a, bool closeDir, IndexDeletionPolicy deletionPolicy, bool autoCommit, int maxFieldLength, IndexingChain indexingChain, IndexCommit commit)
		{
			if (IndexReader.IndexExists(d))
			{
				Init(d, a, false, closeDir, deletionPolicy, autoCommit, maxFieldLength, indexingChain, commit);
			}
			else
			{
				Init(d, a, true, closeDir, deletionPolicy, autoCommit, maxFieldLength, indexingChain, commit);
			}
		}
Exemplo n.º 29
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		/// <summary>Expert: reopen this reader on a specific commit point.
		/// This always returns a readOnly reader.  If the
		/// specified commit point matches what this reader is
		/// already on, and this reader is already readOnly, then
		/// this same instance is returned; if it is not already
		/// readOnly, a readOnly clone is returned. 
		/// </summary>
		public virtual IndexReader Reopen(IndexCommit commit)
		{
			lock (this)
			{
				throw new System.NotSupportedException("This reader does not support reopen(IndexCommit).");
			}
		}
Exemplo n.º 30
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		private void  Init(Directory d, Analyzer a, bool create, bool closeDir, IndexDeletionPolicy deletionPolicy, bool autoCommit, int maxFieldLength, IndexingChain indexingChain, IndexCommit commit)
		{
			this.closeDir = closeDir;
			directory = d;
			analyzer = a;
			SetMessageID(defaultInfoStream);
			this.maxFieldLength = maxFieldLength;
			
			if (indexingChain == null)
				indexingChain = DocumentsWriter.DefaultIndexingChain;
			
			if (create)
			{
				// Clear the write lock in case it's leftover:
				directory.ClearLock(WRITE_LOCK_NAME);
			}
			
			Lock writeLock = directory.MakeLock(WRITE_LOCK_NAME);
			if (!writeLock.Obtain(writeLockTimeout))
			// obtain write lock
			{
				throw new LockObtainFailedException("Index locked for write: " + writeLock);
			}
			this.writeLock = writeLock; // save it

            bool success = false;
			try
			{
				if (create)
				{
					// Try to read first.  This is to allow create
					// against an index that's currently open for
					// searching.  In this case we write the next
					// segments_N file with no segments:
					bool doCommit;
					try
					{
						segmentInfos.Read(directory);
						segmentInfos.Clear();
						doCommit = false;
					}
					catch (System.IO.IOException e)
					{
						// Likely this means it's a fresh directory
						doCommit = true;
					}
					
					if (autoCommit || doCommit)
					{
						// Always commit if autoCommit=true, else only
						// commit if there is no segments file in this dir
						// already.
						segmentInfos.Commit(directory);
						SupportClass.CollectionsHelper.AddAllIfNotContains(synced, segmentInfos.Files(directory, true));
					}
					else
					{
						// Record that we have a change (zero out all
						// segments) pending:
						changeCount++;
					}
				}
				else
				{
					segmentInfos.Read(directory);
					
					if (commit != null)
					{
						// Swap out all segments, but, keep metadata in
						// SegmentInfos, like version & generation, to
						// preserve write-once.  This is important if
						// readers are open against the future commit
						// points.
						if (commit.GetDirectory() != directory)
							throw new System.ArgumentException("IndexCommit's directory doesn't match my directory");
						SegmentInfos oldInfos = new SegmentInfos();
						oldInfos.Read(directory, commit.GetSegmentsFileName());
						segmentInfos.Replace(oldInfos);
						changeCount++;
						if (infoStream != null)
							Message("init: loaded commit \"" + commit.GetSegmentsFileName() + "\"");
					}
					
					// We assume that this segments_N was previously
					// properly sync'd:
					SupportClass.CollectionsHelper.AddAllIfNotContains(synced, segmentInfos.Files(directory, true));
				}
				
				this.autoCommit = autoCommit;
				SetRollbackSegmentInfos(segmentInfos);
				
				docWriter = new DocumentsWriter(directory, this, indexingChain);
				docWriter.SetInfoStream(infoStream);
				docWriter.SetMaxFieldLength(maxFieldLength);
				
				// Default deleter (for backwards compatibility) is
				// KeepOnlyLastCommitDeleter:
				deleter = new IndexFileDeleter(directory, deletionPolicy == null?new KeepOnlyLastCommitDeletionPolicy():deletionPolicy, segmentInfos, infoStream, docWriter,synced);
				
				if (deleter.startingCommitDeleted)
				// Deletion policy deleted the "head" commit point.
				// We have to mark ourself as changed so that if we
				// are closed w/o any further changes we write a new
				// segments_N file.
					changeCount++;
				
				PushMaxBufferedDocs();
				
				if (infoStream != null)
				{
					Message("init: create=" + create);
					MessageState();
				}

                success = true;
			}
			finally
			{
                if (!success)
                {
                    if (infoStream != null)
                    {
                        Message("init: hit exception on init; releasing write lock");
                    }
                    try
                    {
                        writeLock.Release();
                    }
                    catch (Exception t)
                    {
                        // don't mask the original exception
                    }
                    writeLock = null;
                }
			}
		}