/// <summary>
/// Makes a Query asynchronously where the expected Result is a <see cref="SparqlResultSet">SparqlResultSet</see> i.e. SELECT and ASK Queries.
/// </summary>
/// <param name="query">SPARQL Query String.</param>
/// <param name="callback">Callback to invoke when the query completes.</param>
/// <param name="state">State to pass to the callback.</param>
public void QueryWithResultSet(String query, SparqlResultsCallback callback, Object state)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Uri);
request.Method = "POST";
request.ContentType = MimeTypesHelper.Utf8WWWFormURLEncoded;
request.Accept = ResultsAcceptHeader;
ApplyRequestOptions(request);
Tools.HttpDebugRequest(request);
try
{
request.BeginGetRequestStream(result =>
{
try
{
Stream stream = request.EndGetRequestStream(result);
using (StreamWriter writer = new StreamWriter(stream, new UTF8Encoding(Options.UseBomForUtf8)))
{
writer.Write("query=");
writer.Write(HttpUtility.UrlEncode(query));
foreach (String u in DefaultGraphs)
{
writer.Write("&default-graph-uri=");
writer.Write(HttpUtility.UrlEncode(u));
}
foreach (String u in NamedGraphs)
{
writer.Write("&named-graph-uri=");
writer.Write(HttpUtility.UrlEncode(u));
}
writer.Close();
}
request.BeginGetResponse(innerResult =>
{
try
{
using (HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(innerResult))
{
Tools.HttpDebugResponse(response);
ISparqlResultsReader parser = MimeTypesHelper.GetSparqlParser(response.ContentType, false);
SparqlResultSet rset = new SparqlResultSet();
parser.Load(rset, new StreamReader(response.GetResponseStream()));
response.Close();
callback(rset, state);
}
}
catch (SecurityException secEx)
{
callback(null, new AsyncError(new RdfQueryException("Calling code does not have permission to access the specified remote endpoint, see inner exception for details", secEx), state));
}
catch (WebException webEx)
{
if (webEx.Response != null)
{
Tools.HttpDebugResponse((HttpWebResponse)webEx.Response);
}
callback(null, new AsyncError(new RdfQueryException("A HTTP error occurred while making an asynchronous query, see inner exception for details", webEx), state));
}
catch (Exception ex)
{
callback(null, new AsyncError(new RdfQueryException("Unexpected error while making an asynchronous query, see inner exception for details", ex), state));
}
}, null);
}
catch (SecurityException secEx)
{
callback(null, new AsyncError(new RdfQueryException("Calling code does not have permission to access the specified remote endpoint, see inner exception for details", secEx), state));
}
catch (WebException webEx)
{
if (webEx.Response != null)
{
Tools.HttpDebugResponse((HttpWebResponse)webEx.Response);
}
callback(null, new AsyncError(new RdfQueryException("A HTTP error occurred while making an asynchronous query, see inner exception for details", webEx), state));
}
catch (Exception ex)
{
callback(null, new AsyncError(new RdfQueryException("Unexpected error while making an asynchronous query, see inner exception for details", ex), state));
}
}, null);
}
catch (Exception ex)
{
callback(null, new AsyncError(new RdfQueryException("Unexpected error while making an asynchronous query, see inner exception for details", ex), state));
}
}
public void SparqlBgpEvaluation()
{
//Prepare the Store
TripleStore store = new TripleStore();
Graph g = new Graph();
FileLoader.Load(g, "resources\\Turtle.ttl");
store.Add(g);
SparqlQueryParser parser = new SparqlQueryParser();
SparqlQuery q = parser.ParseFromString(@"PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT * WHERE {?s ?p ?o . ?s rdfs:label ?label}");
Object testResult = store.ExecuteQuery(q);
ISparqlAlgebra testAlgebra = q.ToAlgebra();
if (testResult is SparqlResultSet)
{
SparqlResultSet rset = (SparqlResultSet)testResult;
Console.WriteLine(rset.Count + " Results");
foreach (SparqlResult r in rset)
{
Console.WriteLine(r.ToString());
}
Console.WriteLine();
}
//Create some Triple Patterns
TriplePattern t1 = new TriplePattern(new VariablePattern("?s"), new VariablePattern("?p"), new VariablePattern("?o"));
TriplePattern t2 = new TriplePattern(new VariablePattern("?s"), new NodeMatchPattern(g.CreateUriNode("rdfs:label")), new VariablePattern("?label"));
TriplePattern t3 = new TriplePattern(new VariablePattern("?x"), new VariablePattern("?y"), new VariablePattern("?z"));
TriplePattern t4 = new TriplePattern(new VariablePattern("?s"), new NodeMatchPattern(g.CreateUriNode(":name")), new VariablePattern("?name"));
//Build some BGPs
Bgp selectNothing = new Bgp();
Bgp selectAll = new Bgp(t1);
Bgp selectLabelled = new Bgp(new List<ITriplePattern>() { t1, t2 });
Bgp selectAllDisjoint = new Bgp(new List<ITriplePattern>() { t1, t3 });
Bgp selectLabels = new Bgp(t2);
Bgp selectNames = new Bgp(t4);
//LeftJoin selectOptionalNamed = new LeftJoin(selectAll, new Optional(selectNames));
LeftJoin selectOptionalNamed = new LeftJoin(selectAll, selectNames);
Union selectAllUnion = new Union(selectAll, selectAll);
Union selectAllUnion2 = new Union(selectAllUnion, selectAll);
Filter selectAllUriObjects = new Filter(selectAll, new UnaryExpressionFilter(new IsUriFunction(new VariableTerm("o"))));
//Test out the BGPs
//Console.WriteLine("{}");
//this.ShowMultiset(selectNothing.Evaluate(new SparqlEvaluationContext(null, store)));
//Console.WriteLine("{?s ?p ?o}");
//this.ShowMultiset(selectAll.Evaluate(new SparqlEvaluationContext(null, store)));
//Console.WriteLine("{?s ?p ?o . ?s rdfs:label ?label}");
//SparqlEvaluationContext context = new SparqlEvaluationContext(null, store);
//this.ShowMultiset(selectLabelled.Evaluate(context));
//SparqlResultSet lvnResult = new SparqlResultSet(context);
//Console.WriteLine("{?s ?p ?o . ?x ?y ?z}");
//this.ShowMultiset(selectAllDisjoint.Evaluate(new SparqlEvaluationContext(null, store)));
//Console.WriteLine("{?s ?p ?o . OPTIONAL {?s :name ?name}}");
//this.ShowMultiset(selectOptionalNamed.Evaluate(new SparqlEvaluationContext(null, store)));
Console.WriteLine("{{?s ?p ?o} UNION {?s ?p ?o}}");
this.ShowMultiset(selectAllUnion.Evaluate(new SparqlEvaluationContext(null, new InMemoryDataset(store))));
Console.WriteLine("{{?s ?p ?o} UNION {?s ?p ?o} UNION {?s ?p ?o}}");
this.ShowMultiset(selectAllUnion2.Evaluate(new SparqlEvaluationContext(null, new InMemoryDataset(store))));
Console.WriteLine("{?s ?p ?o FILTER (ISURI(?o))}");
this.ShowMultiset(selectAllUriObjects.Evaluate(new SparqlEvaluationContext(null, new InMemoryDataset(store))));
}
/// <summary>
/// Determines whether two Result Sets are equal
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
/// <remarks>
/// Experimental and not yet complete
/// </remarks>
public override bool Equals(object obj)
{
if (obj == null)
{
return(false);
}
if (obj is SparqlResultSet)
{
SparqlResultSet results = (SparqlResultSet)obj;
//Must contain same number of Results to be equal
if (this.Count != results.Count)
{
return(false);
}
//Must have same Boolean result to be equal
if (this.Result != results.Result)
{
return(false);
}
//Must contain the same set of variables
if (this.Variables.Count() != results.Variables.Count())
{
return(false);
}
if (!this.Variables.All(v => results.Variables.Contains(v)))
{
return(false);
}
if (results.Variables.Any(v => !this._variables.Contains(v)))
{
return(false);
}
//If both have no results then they are equal
if (this.Count == 0 && results.Count == 0)
{
return(true);
}
//All Ground Results from the Result Set must appear in the Other Result Set
List <SparqlResult> otherResults = results.OrderByDescending(r => r.Variables.Count()).ToList();
List <SparqlResult> localResults = new List <SparqlResult>();
int grCount = 0;
foreach (SparqlResult result in this.Results.OrderByDescending(r => r.Variables.Count()))
{
if (result.IsGroundResult)
{
//If a Ground Result in this Result Set is not in the other Result Set we're not equal
if (!otherResults.Remove(result))
{
return(false);
}
grCount++;
}
else
{
localResults.Add(result);
}
}
//If all the Results were ground results and we've emptied all the Results from the other Result Set
//then we were equal
if (this.Count == grCount && otherResults.Count == 0)
{
return(true);
}
//If the Other Results still contains Ground Results we're not equal
if (otherResults.Any(r => r.IsGroundResult))
{
return(false);
}
//Create Graphs of the two sets of non-Ground Results
SparqlResultSet local = new SparqlResultSet();
SparqlResultSet other = new SparqlResultSet();
foreach (String var in this._variables)
{
local.AddVariable(var);
other.AddVariable(var);
}
foreach (SparqlResult r in localResults)
{
local.AddResult(r);
}
foreach (SparqlResult r in otherResults)
{
other.AddResult(r);
}
//Compare the two Graphs for equality
SparqlRdfWriter writer = new SparqlRdfWriter();
IGraph g = writer.GenerateOutput(local);
IGraph h = writer.GenerateOutput(other);
return(g.Equals(h));
}
else
{
return(false);
}
}
private void TestQuery(string query, bool checkGraphEquality)
{
EnsureTestData();
GC.WaitForPendingFinalizers();
GC.Collect();
var q = _parser.ParseFromString(query);
_output.WriteLine("Query:");
_output.WriteLine(_formatter.Format(q));
_output.WriteLine(string.Empty);
_output.WriteLine("Normal Algebra:");
_output.WriteLine(q.ToAlgebra().ToString());
_output.WriteLine(string.Empty);
var timer = new Stopwatch();
//Evaluate normally
timer.Start();
var normResults = _processor.ProcessQuery(q);
timer.Stop();
_output.WriteLine("Normal Evaluation took " + timer.Elapsed);
timer.Reset();
if (normResults is SparqlResultSet)
{
SparqlResultSet rsetNorm = (SparqlResultSet)normResults;
_output.WriteLine("Normal Evaluation returned " + rsetNorm.Count + " Result(s)");
_output.WriteLine(string.Empty);
//Evaluate parallelised
q.AlgebraOptimisers = new IAlgebraOptimiser[] { new ParallelEvaluationOptimiser() };
_output.WriteLine("Parallel Algebra:");
_output.WriteLine(q.ToAlgebra().ToString());
_output.WriteLine(string.Empty);
timer.Start();
var parResults = _processor.ProcessQuery(q);
timer.Stop();
_output.WriteLine("Parallel Evaluation took " + timer.Elapsed);
if (parResults is SparqlResultSet rsetPar)
{
_output.WriteLine("Parallel Evaluation returned " + rsetPar.Count + " Result(s)");
Assert.Equal(rsetNorm.Count, rsetPar.Count);
if (checkGraphEquality)
{
Assert.StrictEqual(rsetNorm, rsetPar);
}
}
else
{
Assert.True(false, "Query did not return a SPARQL Result Set as expected");
}
}
else
{
Assert.True(false, "Query did not return a SPARQL Result Set for normal evaluation as expected");
}
}
private void TestProductTimeout(IGraph data, String query, bool useGlobal, int expectedResults)
{
Console.WriteLine("Maximum Expected Results: " + expectedResults);
Console.WriteLine("Initial Global Timeout: " + Options.QueryExecutionTimeout);
Console.WriteLine();
long globalOrig = Options.QueryExecutionTimeout;
try
{
if (useGlobal)
{
Console.WriteLine("Global Timeout setting in use");
}
else
{
Console.WriteLine("Per Query Timeout setting in use");
}
Console.WriteLine();
TripleStore store = new TripleStore();
store.Add(data);
SparqlQuery q = this._parser.ParseFromString(query);
LeviathanQueryProcessor processor = new LeviathanQueryProcessor(AsDataset(store));
SparqlFormatter formatter = new SparqlFormatter();
Console.WriteLine("Query:");
Console.WriteLine(formatter.Format(q));
//Evaluate for each Timeout
foreach (long t in this._timeouts)
{
//Set the Timeout and ask for Partial Results
if (useGlobal)
{
Options.QueryExecutionTimeout = t;
}
else
{
q.Timeout = t;
}
q.PartialResultsOnTimeout = true;
//Check that the reported Timeout matches the expected
SparqlEvaluationContext context = new SparqlEvaluationContext(q, null);
long expected;
if (useGlobal)
{
expected = t;
}
else
{
if (Options.QueryExecutionTimeout > 0 && t <= Options.QueryExecutionTimeout)
{
expected = t;
}
else if (Options.QueryExecutionTimeout == 0)
{
expected = t;
}
else
{
expected = Options.QueryExecutionTimeout;
}
}
Assert.AreEqual(expected, context.QueryTimeout, "Reported Timeout not as expected");
//Run the Query
Object results = processor.ProcessQuery(q);
if (results is SparqlResultSet)
{
SparqlResultSet rset = (SparqlResultSet)results;
Console.WriteLine("Requested Timeout: " + t + " - Actual Timeout: " + expected + "ms - Results: " + rset.Count + " - Query Time: " + q.QueryExecutionTime);
Assert.IsTrue(rset.Count <= expectedResults, "Results should be <= expected");
}
else
{
Assert.Fail("Did not get a Result Set as expected");
}
}
}
finally
{
Options.QueryExecutionTimeout = globalOrig;
}
}
public void SparqlRemoteEndpointSyncVsAsyncTimeLocalVirtuoso()
{
if (!TestConfigManager.GetSettingAsBoolean(TestConfigManager.UseVirtuoso))
{
Assert.Inconclusive("Test Config marks Virtuoso as unavailable, test cannot be run");
}
String query;
using (StreamReader reader = new StreamReader("dbpedia-query-time.rq"))
{
query = reader.ReadToEnd();
reader.Close();
}
SparqlRemoteEndpoint endpoint = new SparqlRemoteEndpoint(new Uri(TestConfigManager.GetSetting(TestConfigManager.VirtuosoEndpoint)));
endpoint.Timeout = AsyncTimeout;
Stopwatch timer = new Stopwatch();
timer.Start();
SparqlResultSet syncGetResults = endpoint.QueryWithResultSet(query) as SparqlResultSet;
timer.Stop();
Console.WriteLine("Sync Query (GET): " + timer.Elapsed);
TestTools.ShowResults(syncGetResults);
Console.WriteLine();
timer.Reset();
timer.Start();
endpoint.HttpMode = "POST";
SparqlResultSet syncPostResults = endpoint.QueryWithResultSet(query) as SparqlResultSet;
timer.Stop();
Console.WriteLine("Sync Query (POST): " + timer.Elapsed);
TestTools.ShowResults(syncPostResults);
Console.WriteLine();
timer.Reset();
ManualResetEvent signal = new ManualResetEvent(false);
SparqlResultSet asyncResults = null;
//DateTime start = DateTime.Now;
//DateTime end = start;
timer.Start();
endpoint.QueryWithResultSet(query, (r, s) =>
{
//end = DateTime.Now;
timer.Stop();
asyncResults = r;
signal.Set();
signal.Close();
}, null);
Thread.Sleep(AsyncTimeout);
Assert.IsTrue(signal.SafeWaitHandle.IsClosed, "Wait Handle should be closed");
Console.WriteLine("Async Query: " + timer.Elapsed);//(end - start));
TestTools.ShowResults(asyncResults);
Assert.AreEqual(syncGetResults, asyncResults, "Result Sets should be equal");
}
