/// <summary>
/// Creates search and taxonomy readers over the corresponding directories.
///
/// <para>
/// <b>NOTE:</b> you should only use this constructor if you commit and call
/// <see cref="Search.ReferenceManager{G}.MaybeRefresh()"/> (on the <see cref="Index.ReaderManager"/>) in the same thread. Otherwise it could lead to an
/// unsync'd <see cref="IndexSearcher"/> and <see cref="TaxonomyReader"/> pair.
/// </para>
/// </summary>
public SearcherTaxonomyManager(Store.Directory indexDir, Store.Directory taxoDir, SearcherFactory searcherFactory)
{
if (searcherFactory is null)
{
searcherFactory = new SearcherFactory();
}
this.searcherFactory = searcherFactory;
var taxoReader = new DirectoryTaxonomyReader(taxoDir);
Current = new SearcherAndTaxonomy(SearcherManager.GetSearcher(
searcherFactory, DirectoryReader.Open(indexDir)), taxoReader);
this.taxoWriter = null;
taxoEpoch = -1;
}
public void Check_IndexReader_Get_Closed_When_Creating_New()
{
var dir = new RAMDirectory();
var writer = new IndexWriter(dir, new SimpleAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
var manager = new SearcherManager(dir);
var searcher1 = manager.GetSearcher();
// Change the index
writer.AddDocument(new Document());
writer.Commit();
// Reopen the IndexReader
manager.MaybeReopen();
var searcher2 = manager.GetSearcher();
Assert.AreNotEqual(searcher1.IndexReader, searcher2.IndexReader, "A new IndexReader was not created.");
manager.ReleaseSearcher(searcher2);
manager.ReleaseSearcher(searcher1);
Assert.Throws <AlreadyClosedException>(() => manager.ReleaseSearcher(searcher1));
}
/// <summary>
/// Creates near-real-time searcher and taxonomy reader
/// from the corresponding writers.
/// </summary>
public SearcherTaxonomyManager(IndexWriter writer, bool applyAllDeletes,
SearcherFactory searcherFactory, DirectoryTaxonomyWriter taxoWriter)
{
if (searcherFactory == null)
{
searcherFactory = new SearcherFactory();
}
this.searcherFactory = searcherFactory;
this.taxoWriter = taxoWriter;
var taxoReader = new DirectoryTaxonomyReader(taxoWriter);
Current = new SearcherAndTaxonomy(SearcherManager.GetSearcher(
searcherFactory, DirectoryReader.Open(writer, applyAllDeletes)), taxoReader);
this.taxoEpoch = taxoWriter.TaxonomyEpoch;
}
private string[] Search(SearcherManager manager, string searchString)
{
var parser = new QueryParser(LuceneVersion, FieldName, _analyzer);
Query q = parser.Parse(searchString);
var searcher = manager.GetSearcher();
TopDocs hits = searcher.Search(q, null, 100, Sort.RELEVANCE);
var resultStrings = new List <string>(hits.ScoreDocs.Length);
resultStrings.AddRange(hits.ScoreDocs.Select(match => searcher.Doc(match.Doc)).Select(doc => doc.Get(FieldName)));
manager.ReleaseSearcher(searcher);
return(resultStrings.ToArray());
}
public static void SearchSample()
{
Directory dir = new RAMDirectory();
Analyzer analyzer = new StandardAnalyzer(Version);
var indexWriter = new IndexWriter(dir, analyzer, IndexWriter.MaxFieldLength.UNLIMITED);
SpatialContext ctx = SpatialContext.GEO;
var strategy = new PointVectorStrategy(ctx, SpartialFieldName);
//var precision = 8; // Precision 8 means down to 19 meter - higher precision consumes more memory
//SpatialPrefixTree grid = new GeohashPrefixTree(ctx, precision);
//var strategy = new RecursivePrefixTreeStrategy(grid, spartialFieldName);
var docs = CreateSearchDocuments(GetDeals(), strategy);
foreach (var doc in docs)
{
indexWriter.AddDocument(doc);
}
indexWriter.Commit();
indexWriter.Dispose();
// "Current" position
Point littleMermaid = ctx.MakePoint(12.599239, 55.692848);
//var parser = new QueryParser(Version, "title", analyzer);
//Query q = parser.Parse("deal");
Query q = new MatchAllDocsQuery(); // NOTE: MatchAllDocsQuery always returns score as 1.0
// Add distance from current point to the scoring
q = new DistanceCustomScoreQuery(q, strategy, littleMermaid);
//q = new RecursivePrefixTreeStrategyDistanceCustomScoreQuery(q, strategy, littleMermaid, spartialFieldName);
// Remove everything more than 2000 km away
var filter = strategy.MakeFilter(new SpatialArgs(SpatialOperation.Intersects,
ctx.MakeCircle(littleMermaid, DistanceUtils.Dist2Degrees(2000, DistanceUtils.EARTH_MEAN_RADIUS_KM))));
// Ensures the most recent searcher is used without destroying the Lucene IndexReader cache (via NRT)
var searcherManager = new SearcherManager(dir);
var collector = new GroupTopDocsCollector(5, SupplierFieldName);
var searcher = searcherManager.GetSearcher();
try
{
searcher.Search(q, filter, collector);
}
finally
{
searcherManager.ReleaseSearcher(searcher);
}
var hits = collector.GroupTopDocs();
Console.WriteLine("Found {0} document(s) that matched query '{1}':", hits.TotalHits, q);
foreach (var match in hits.GroupScoreDocs)
{
Document doc = searcher.Doc(match.Doc);
Console.WriteLine("Best match '{0}' in group '{1}' with count {2} (MaxDoc: Score {3} Location '{4}')",
doc.Get(TitleFieldName), match.GroupFieldValue, match.GroupCount, match.Score, doc.Get(LocationNameFieldName));
}
}