public MoreLikeThisQueryResult ExecuteMoreLikeThisQuery(MoreLikeThisQuery query, TransactionInformation transactionInformation, int pageSize = 25, string[] include = null)
{
if (query == null) throw new ArgumentNullException("query");
var index = database.IndexStorage.GetIndexInstance(query.IndexName);
if (index == null)
throw new InvalidOperationException("The index " + query.IndexName + " cannot be found");
if (string.IsNullOrEmpty(query.DocumentId) && query.MapGroupFields.Count == 0)
throw new InvalidOperationException("The document id or map group fields are mandatory");
IndexSearcher searcher;
using (database.IndexStorage.GetCurrentIndexSearcher(index.indexId, out searcher))
{
var documentQuery = new BooleanQuery();
if (string.IsNullOrEmpty(query.DocumentId) == false)
{
documentQuery.Add(new TermQuery(new Term(Constants.DocumentIdFieldName, query.DocumentId.ToLowerInvariant())), Occur.MUST);
}
foreach (string key in query.MapGroupFields.Keys)
{
documentQuery.Add(new TermQuery(new Term(key, query.MapGroupFields[key])), Occur.MUST);
}
var td = searcher.Search(documentQuery, 1);
// get the current Lucene docid for the given RavenDB doc ID
if (td.ScoreDocs.Length == 0)
throw new InvalidOperationException("Document " + query.DocumentId + " could not be found");
var ir = searcher.IndexReader;
var mlt = new RavenMoreLikeThis(ir);
AssignParameters(mlt, query);
if (string.IsNullOrWhiteSpace(query.StopWordsDocumentId) == false)
{
var stopWordsDoc = database.Documents.Get(query.StopWordsDocumentId, null);
if (stopWordsDoc == null)
throw new InvalidOperationException("Stop words document " + query.StopWordsDocumentId + " could not be found");
var stopWordsSetup = stopWordsDoc.DataAsJson.JsonDeserialization<StopWordsSetup>();
if (stopWordsSetup.StopWords != null)
{
var stopWords = stopWordsSetup.StopWords;
var ht = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase);
foreach (var stopWord in stopWords)
{
ht.Add(stopWord);
}
mlt.SetStopWords(ht);
}
}
var fieldNames = query.Fields ?? GetFieldNames(ir);
mlt.SetFieldNames(fieldNames);
var toDispose = new List<Action>();
RavenPerFieldAnalyzerWrapper perFieldAnalyzerWrapper = null;
try
{
perFieldAnalyzerWrapper = index.CreateAnalyzer(new LowerCaseKeywordAnalyzer(), toDispose, true);
mlt.Analyzer = perFieldAnalyzerWrapper;
var mltQuery = mlt.Like(td.ScoreDocs[0].Doc);
var tsdc = TopScoreDocCollector.Create(pageSize, true);
searcher.Search(mltQuery, tsdc);
var hits = tsdc.TopDocs().ScoreDocs;
var jsonDocuments = GetJsonDocuments(query, searcher, index, query.IndexName, hits, td.ScoreDocs[0].Doc);
var result = new MultiLoadResult();
var includedEtags = new List<byte>(jsonDocuments.SelectMany(x => x.Etag.ToByteArray()));
includedEtags.AddRange(database.Indexes.GetIndexEtag(query.IndexName, null).ToByteArray());
var loadedIds = new HashSet<string>(jsonDocuments.Select(x => x.Key));
var addIncludesCommand = new AddIncludesCommand(database, transactionInformation, (etag, includedDoc) =>
{
includedEtags.AddRange(etag.ToByteArray());
result.Includes.Add(includedDoc);
}, include ?? new string[0], loadedIds);
foreach (var jsonDocument in jsonDocuments)
{
result.Results.Add(jsonDocument.ToJson());
addIncludesCommand.Execute(jsonDocument.DataAsJson);
}
Etag computedEtag;
using (var md5 = MD5.Create())
{
var computeHash = md5.ComputeHash(includedEtags.ToArray());
computedEtag = Etag.Parse(computeHash);
}
return new MoreLikeThisQueryResult
{
Etag = computedEtag,
Result = result,
};
}
finally
{
if (perFieldAnalyzerWrapper != null)
perFieldAnalyzerWrapper.Close();
foreach (var action in toDispose)
{
action();
}
}
}
}
private void PerformSearch(IHttpContext context, string indexName, Index index, MoreLikeThisQueryParameters parameters)
{
IndexSearcher searcher;
using (Database.IndexStorage.GetCurrentIndexSearcher(indexName, out searcher))
{
var documentQuery = new BooleanQuery();
if (!string.IsNullOrEmpty(parameters.DocumentId))
{
documentQuery.Add(new TermQuery(new Term(Constants.DocumentIdFieldName, parameters.DocumentId.ToLowerInvariant())),
Occur.MUST);
}
foreach (string key in parameters.MapGroupFields.Keys)
{
documentQuery.Add(new TermQuery(new Term(key, parameters.MapGroupFields[key])),
Occur.MUST);
}
var td = searcher.Search(documentQuery, 1);
// get the current Lucene docid for the given RavenDB doc ID
if (td.ScoreDocs.Length == 0)
{
context.SetStatusToNotFound();
context.WriteJson(new { Error = "Document " + parameters.DocumentId + " could not be found" });
return;
}
var ir = searcher.IndexReader;
var mlt = new RavenMoreLikeThis(ir);
AssignParameters(mlt, parameters);
if (!string.IsNullOrWhiteSpace(parameters.StopWordsDocumentId))
{
var stopWordsDoc = Database.Get(parameters.StopWordsDocumentId, null);
if (stopWordsDoc == null)
{
context.SetStatusToNotFound();
context.WriteJson(
new
{
Error = "Stop words document " + parameters.StopWordsDocumentId + " could not be found"
});
return;
}
var stopWordsSetup = stopWordsDoc.DataAsJson.JsonDeserialization<StopWordsSetup>();
if(stopWordsSetup.StopWords != null)
{
var stopWords = stopWordsSetup.StopWords;
var ht = new Hashtable(StringComparer.InvariantCultureIgnoreCase);
foreach (var stopWord in stopWords)
{
ht[stopWord] = stopWord;
}
mlt.SetStopWords(ht);
}
}
var fieldNames = parameters.Fields ?? GetFieldNames(ir);
mlt.SetFieldNames(fieldNames);
var toDispose = new List<Action>();
PerFieldAnalyzerWrapper perFieldAnalyzerWrapper = null;
try
{
perFieldAnalyzerWrapper = index.CreateAnalyzer(new LowerCaseKeywordAnalyzer(), toDispose, true);
mlt.SetAnalyzer(perFieldAnalyzerWrapper);
var mltQuery = mlt.Like(td.ScoreDocs[0].Doc);
var tsdc = TopScoreDocCollector.Create(context.GetPageSize(Database.Configuration.MaxPageSize), true);
searcher.Search(mltQuery, tsdc);
var hits = tsdc.TopDocs().ScoreDocs;
var jsonDocuments = GetJsonDocuments(parameters, searcher, index, indexName, hits, td.ScoreDocs[0].Doc);
var result = new MultiLoadResult();
var includedEtags = new List<byte>(jsonDocuments.SelectMany(x => x.Etag.Value.ToByteArray()));
includedEtags.AddRange(Database.GetIndexEtag(indexName, null).ToByteArray());
var loadedIds = new HashSet<string>(jsonDocuments.Select(x => x.Key));
var addIncludesCommand = new AddIncludesCommand(Database, GetRequestTransaction(context), (etag, includedDoc) =>
{
includedEtags.AddRange(etag.ToByteArray());
result.Includes.Add(includedDoc);
}, context.Request.QueryString.GetValues("include") ?? new string[0], loadedIds);
foreach (var jsonDocumet in jsonDocuments)
{
result.Results.Add(jsonDocumet.ToJson());
addIncludesCommand.Execute(jsonDocumet.DataAsJson);
}
Guid computedEtag;
using (var md5 = MD5.Create())
{
var computeHash = md5.ComputeHash(includedEtags.ToArray());
computedEtag = new Guid(computeHash);
}
if (context.MatchEtag(computedEtag))
{
context.SetStatusToNotModified();
return;
}
context.Response.AddHeader("ETag", computedEtag.ToString());
context.WriteJson(result);
}
finally
{
if (perFieldAnalyzerWrapper != null)
perFieldAnalyzerWrapper.Close();
foreach (var action in toDispose)
{
action();
}
}
}
}
