| namespace Lucene.Net.Index |
| { |
| using Lucene.Net.Search; |
| using Directory = Lucene.Net.Store.Directory; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| using IndexSearcher = Lucene.Net.Search.IndexSearcher; |
| |
| /// <summary> |
| /// Utility class to safely share <seealso cref="DirectoryReader"/> instances across |
| /// multiple threads, while periodically reopening. this class ensures each |
| /// reader is closed only once all threads have finished using it. |
| /// </summary> |
| /// <seealso cref= SearcherManager |
| /// |
| /// @lucene.experimental </seealso> |
| public sealed class ReaderManager : ReferenceManager<DirectoryReader> |
| { |
| /// <summary> |
| /// Creates and returns a new ReaderManager from the given |
| /// <seealso cref="IndexWriter"/>. |
| /// </summary> |
| /// <param name="writer"> |
| /// the IndexWriter to open the IndexReader from. </param> |
| /// <param name="applyAllDeletes"> |
| /// If <code>true</code>, all buffered deletes will be applied (made |
| /// visible) in the <seealso cref="IndexSearcher"/> / <seealso cref="DirectoryReader"/>. |
| /// If <code>false</code>, the deletes may or may not be applied, but |
| /// remain buffered (in IndexWriter) so that they will be applied in |
| /// the future. Applying deletes can be costly, so if your app can |
| /// tolerate deleted documents being returned you might gain some |
| /// performance by passing <code>false</code>. See |
| /// <seealso cref="DirectoryReader#openIfChanged(DirectoryReader, IndexWriter, boolean)"/>. |
| /// </param> |
| /// <exception cref="IOException"> If there is a low-level I/O error </exception> |
| public ReaderManager(IndexWriter writer, bool applyAllDeletes) |
| { |
| Current = DirectoryReader.Open(writer, applyAllDeletes); |
| } |
| |
| /// <summary> |
| /// Creates and returns a new ReaderManager from the given <seealso cref="Directory"/>. </summary> |
| /// <param name="dir"> the directory to open the DirectoryReader on. |
| /// </param> |
| /// <exception cref="IOException"> If there is a low-level I/O error </exception> |
| public ReaderManager(Directory dir) |
| { |
| Current = DirectoryReader.Open(dir); |
| } |
| |
| protected override void DecRef(DirectoryReader reference) |
| { |
| reference.DecRef(); |
| } |
| |
| protected override DirectoryReader RefreshIfNeeded(DirectoryReader referenceToRefresh) |
| { |
| return DirectoryReader.OpenIfChanged(referenceToRefresh); |
| } |
| |
| protected override bool TryIncRef(DirectoryReader reference) |
| { |
| return reference.TryIncRef(); |
| } |
| |
| protected override int GetRefCount(DirectoryReader reference) |
| { |
| return reference.RefCount; |
| } |
| } |
| } |