public SparqlResultModel(string storeName, IBrightstarService service, SparqlRequestObject sparqlRequest, SparqlResultsFormat resultsFormat)
{
_storeName = storeName;
_sparqlRequest = sparqlRequest;
_service = service;
ResultsFormat = resultsFormat;
}
public string GetString(SparqlResultsFormat format, IRdfWriter graphWriter = null)
{
switch (ResultType)
{
case BrightstarSparqlResultsType.VariableBindings:
case BrightstarSparqlResultsType.Boolean:
var stringWriter = new System.IO.StringWriter();
var sparqlXmlWriter = GetSparqlWriter(format);
sparqlXmlWriter.Save(_resultSet, stringWriter);
return stringWriter.GetStringBuilder().ToString();
case BrightstarSparqlResultsType.Graph:
if (graphWriter == null)
{
#if WINDOWS_PHONE
// Cannot use DTD because the mobile version of XmlWriter doesn't support writing a DOCTYPE.
graphWriter = new RdfXmlWriter(WriterCompressionLevel.High, false);
#else
graphWriter = new RdfXmlWriter();
#endif
}
return StringWriter.Write(_graph, graphWriter);
default:
throw new BrightstarInternalException(
String.Format("Unrecognized result type when serializing results string: {0}",
ResultType));
}
}
public static string ExecuteSparqlQuery(this IStore store, string sparqlExpression,
SparqlResultsFormat resultsFormat)
{
var query = ParseSparql(sparqlExpression);
var resultsStream = new MemoryStream();
store.ExecuteSparqlQuery(query, resultsFormat.WithEncoding(new UTF8Encoding(false)), resultsStream);
var ret = Encoding.UTF8.GetString(resultsStream.ToArray());
return ret;
}
public static string Query(this StoreWorker storeWorker, string sparqlExpression,
SparqlResultsFormat resultsFormat, string[] defaultGraphUris)
{
var query = ParseSparql(sparqlExpression);
using (var resultsStream = new MemoryStream())
{
storeWorker.Query(query, resultsFormat.WithEncoding(new UTF8Encoding(false)), resultsStream, defaultGraphUris);
return Encoding.UTF8.GetString(resultsStream.ToArray());
}
}
public SparqlResultModel(string storeName, ulong commitId, IBrightstarService service,
SparqlRequestObject sparqlRequest, SparqlResultsFormat resultsFormat, RdfFormat graphFormat)
{
_storeName = storeName;
_commitId = commitId;
_sparqlRequest = sparqlRequest;
_service = service;
ResultsFormat = resultsFormat;
GraphFormat = graphFormat;
}
public Stream GetResultsStream(SparqlResultsFormat format, RdfFormat graphFormat, DateTime? ifNotModifiedSince, out ISerializationFormat streamFormat)
{
if (_commitId > 0)
{
var commitPointInfo = _service.GetCommitPoint(_storeName, _commitId);
if (commitPointInfo == null) throw new InvalidCommitPointException();
return _service.ExecuteQuery(commitPointInfo, _sparqlRequest.Query, _sparqlRequest.DefaultGraphUri, format, graphFormat, out streamFormat);
}
return _service.ExecuteQuery(_storeName, _sparqlRequest.Query, _sparqlRequest.DefaultGraphUri, ifNotModifiedSince, format, graphFormat, out streamFormat);
}
private ISparqlResultsWriter GetSparqlWriter(SparqlResultsFormat format)
{
var ext = format.DefaultExtension;
if (ext.Equals(SparqlResultsFormat.Xml.DefaultExtension))
return new SparqlXmlWriter();
if (ext.Equals(SparqlResultsFormat.Json.DefaultExtension))
return new SparqlJsonWriter();
if (ext.Equals(SparqlResultsFormat.Tsv.DefaultExtension))
return new SparqlTsvWriter();
if (ext.Equals(SparqlResultsFormat.Csv.DefaultExtension))
return new SparqlCsvWriter();
throw new BrightstarInternalException("Unsupported SPARQL results format");
}
private static ISparqlResultsWriter GetWriter(SparqlResultsFormat format)
{
if (format == SparqlResultsFormat.Csv)
{
return new SparqlCsvWriter();
}
if (format == SparqlResultsFormat.Tsv)
{
return new SparqlTsvWriter();
}
if (format == SparqlResultsFormat.Json)
{
return new SparqlJsonWriter();
}
return new SparqlXmlWriter();
}
public SparqlQueryHandler(ISerializationFormat targetFormat,
IEnumerable<string> defaultGraphUris)
{
if (targetFormat is SparqlResultsFormat)
{
_sparqlResultsFormat = targetFormat as SparqlResultsFormat;
}
if (targetFormat is RdfFormat)
{
_rdfFormat = targetFormat as RdfFormat;
}
if (defaultGraphUris != null)
{
_defaultGraphUris = defaultGraphUris.Select(g => new Uri(g)).ToList();
}
}
public string AsString(SparqlResultsFormat format)
{
var g = new VDS.RDF.Graph();
var results = new List<SparqlResult>();
foreach (var graphUri in Graphs)
{
var s = new Set();
s.Add(SparqlResultVariableName, g.CreateUriNode(new Uri(graphUri)));
results.Add(new SparqlResult(s));
}
var rs = new SparqlResultSet(results);
var writer = GetWriter(format);
var sw = new StringWriter();
writer.Save(rs, sw);
sw.Flush();
return sw.ToString();
}
public SparqlQueryResponse(SparqlQueryProcessingModel model, DateTime? ifNotModifiedSince, SparqlResultsFormat format)
{
try
{
var resultStream = model.GetResultsStream(format, ifNotModifiedSince);
Contents = resultStream.CopyTo;
ContentType = format.MediaTypes[0];
StatusCode = HttpStatusCode.OK;
}
catch (InvalidCommitPointException)
{
StatusCode = HttpStatusCode.NotFound;
}
catch (BrightstarStoreNotModifiedException)
{
StatusCode = HttpStatusCode.NotModified;
}
}
public SparqlQueryResponse(SparqlQueryProcessingModel model, DateTime? ifNotModifiedSince, SparqlResultsFormat format, RdfFormat graphFormat)
{
try
{
ISerializationFormat streamFormat;
var resultStream = model.GetResultsStream(format, graphFormat, ifNotModifiedSince, out streamFormat);
Contents = resultStream.CopyTo;
ContentType = streamFormat.ToString();
StatusCode = HttpStatusCode.OK;
}
catch (InvalidCommitPointException)
{
StatusCode = HttpStatusCode.NotFound;
}
catch (BrightstarStoreNotModifiedException)
{
StatusCode = HttpStatusCode.NotModified;
}
}
// operations
public ISerializationFormat Query(string storeName, string queryExpression, IEnumerable<string> defaultGraphUris,
DateTime? ifNotModifiedSince,
SparqlResultsFormat sparqlResultFormat, RdfFormat graphFormat,
Stream responseStream)
{
Logging.LogDebug("Query {0} {1}", storeName, queryExpression);
var commitPoint =
_storeManager.GetMasterFile(Path.Combine(_baseLocation, storeName)).GetCommitPoints().First();
if (ifNotModifiedSince.HasValue && ifNotModifiedSince > commitPoint.CommitTime)
{
throw new BrightstarStoreNotModifiedException();
}
var g = defaultGraphUris == null ? null : defaultGraphUris.ToArray();
var query = ParseSparql(queryExpression);
var targetFormat = QueryReturnsGraph(query) ? (ISerializationFormat) graphFormat : sparqlResultFormat;
var cacheKey = MakeQueryCacheKey(storeName, commitPoint.CommitTime.Ticks, query, g, targetFormat);
var cachedResult = GetCachedResult(cacheKey);
if (cachedResult == null)
{
// Not in the cache so execute the query on the StoreWorker
var storeWorker = GetStoreWorker(storeName);
var cacheStream = new MemoryStream();
storeWorker.Query(query, targetFormat, cacheStream, g);
cachedResult = CacheResult(cacheKey, cacheStream.ToArray());
}
cachedResult.WriteTo(responseStream);
return targetFormat;
}
/// <summary>
/// Query a specific commit point of a store
/// </summary>
/// <param name="commitPoint">The commit point be queried</param>
/// <param name="queryExpression">The SPARQL query string</param>
/// <param name="defaultGraphUri">The URI of the default graph for the query</param>
/// <param name="resultsFormat">OPTIONAL: Specifies the serialization format for the SPARQL results. Defaults to <see cref="SparqlResultsFormat.Xml"/></param>
/// <returns>A stream containing XML SPARQL results</returns>
public Stream ExecuteQuery(ICommitPointInfo commitPoint, string queryExpression,
string defaultGraphUri, SparqlResultsFormat resultsFormat = null)
{
return ExecuteQuery(commitPoint, queryExpression, new[] {defaultGraphUri}, resultsFormat);
}
/// <summary>
/// Query the store using a SPARQL query
/// </summary>
/// <param name="storeName">Store to query</param>
/// <param name="queryExpression">SPARQL query string</param>
/// <param name="defaultGraphUris"></param>
/// <param name="ifNotModifiedSince">OPTIONAL : If this parameter is provided and the store has not been changed since the time specified,
/// a BrightstarClientException will be raised with the message "Store not modified".</param>
/// <param name="resultsFormat">OPTIONAL: The serialization format for the SPARQL results set. Defaults to <see cref="SparqlResultsFormat.Xml"/>.</param>
/// <returns>A stream containing XML SPARQL result XML</returns>
/// <remarks>If the <paramref name="ifNotModifiedSince"/> parameter is used by an application, then the default caching provided
/// by this class will be bypassed</remarks>
public Stream ExecuteQuery(string storeName, string queryExpression, IEnumerable<string> defaultGraphUris, DateTime? ifNotModifiedSince = null, SparqlResultsFormat resultsFormat = null)
{
ValidateStoreName(storeName);
if (queryExpression == null)
throw new ArgumentNullException("queryExpression", Strings.BrightstarServiceClient_QueryMustNotBeNull);
if (String.Empty.Equals(queryExpression))
throw new ArgumentException(Strings.BrightstarServiceClient_QueryMustNotBeEmptyString, "queryExpression");
var g = defaultGraphUris == null ? null : defaultGraphUris.ToArray();
string cacheKey = null;
CachedQueryResult cachedResult = null;
if (ifNotModifiedSince == null && _queryCache != null)
{
cacheKey = storeName + "_" + queryExpression.GetHashCode();
if (defaultGraphUris != null)
{
cacheKey = cacheKey + "_" + String.Join(",", g).GetHashCode();
}
cachedResult = _queryCache.Lookup<CachedQueryResult>(cacheKey);
if (cachedResult != null)
{
ifNotModifiedSince = cachedResult.Timestamp;
}
}
try
{
var mediaType = resultsFormat == null
? SparqlResultsFormat.Xml.MediaTypes.First() + "; charset=utf-8"
: resultsFormat.ToString();
var resultStream = _service.ExecuteQuery(storeName, queryExpression, defaultGraphUris == null ? null : g.ToArray(), ifNotModifiedSince, mediaType);
if (_queryCache != null && cacheKey != null && LastResponseTimestamp.HasValue)
{
using (var streamReader = new StreamReader(resultStream))
{
var resultString = streamReader.ReadToEnd();
cachedResult = new CachedQueryResult(LastResponseTimestamp.Value, resultString);
_queryCache.Insert(cacheKey, cachedResult, CachePriority.Normal);
return new MemoryStream(streamReader.CurrentEncoding.GetBytes(cachedResult.Result));
}
}
else
{
return resultStream;
}
}
catch (FaultException<ExceptionDetail> fault)
{
if (cachedResult != null)
{
if (fault.Detail.Type.Equals("BrightstarDB.Client.BrightstarClientException") &&
fault.Detail.InnerException != null &&
fault.Detail.InnerException.Type.Equals("BrightstarDB.BrightstarStoreNotModifiedException"))
{
// Cached result is still fine
return new MemoryStream(
resultsFormat == null
? Encoding.UTF8.GetBytes(cachedResult.Result)
: resultsFormat.Encoding.GetBytes(cachedResult.Result));
}
}
throw new BrightstarClientException(fault);
}
}
/// <summary>
/// Query the store using a SPARQL query
/// </summary>
/// <param name="storeName">The name of the store to query</param>
/// <param name="queryExpression">SPARQL query string</param>
/// <param name="ifNotModifiedSince">OPTIONAL : If this parameter is provided and the store has not been changed since the time specified,
/// a BrightstarClientException will be raised with the message "Store not modified".</param>
/// <param name="resultsFormat">OPTIONAL: Specifies the serialization format for the SPARQL results. Defaults to <see cref="SparqlResultsFormat.Xml"/></param>
/// <returns>A stream containing XML SPARQL result XML</returns>
public Stream ExecuteQuery(string storeName, string queryExpression,
DateTime? ifNotModifiedSince = null, SparqlResultsFormat resultsFormat = null)
{
return ExecuteQuery(storeName, queryExpression, (IEnumerable<string>) null, ifNotModifiedSince,
resultsFormat);
}
public string Query(string storeName, string queryExpression, IEnumerable<string> defaultGraphUris, SparqlResultsFormat resultsFormat)
{
var g = defaultGraphUris == null ? null : defaultGraphUris.ToArray();
Logging.LogDebug("Query {0} {1}", storeName, queryExpression);
var currentCommitPoint = _storeManager.GetMasterFile(Path.Combine(_baseLocation, storeName)).GetLatestCommitPoint();
var cacheKey = MakeQueryCacheKey(storeName, currentCommitPoint.CommitTime.Ticks,
queryExpression, g, resultsFormat);
var cachedResult = GetCachedResult(cacheKey);
if (cachedResult != null)
{
Logging.LogDebug("Returning cached result for query Query {0} {1}", storeName, queryExpression);
return cachedResult;
}
var storeWorker = GetStoreWorker(storeName);
var result = storeWorker.Query(queryExpression, resultsFormat, g);
//add to cache
CacheResult(cacheKey, result);
return result;
}
private static void WriteResults(SparqlResultsFormat resultsFormat, Stream responseStream, string results)
{
StreamWriter streamWriter;
if (resultsFormat.DefaultExtension.Equals(SparqlResultsFormat.Xml.DefaultExtension) &&
!resultsFormat.Encoding.Equals(Encoding.Unicode))
{
// We need to rewrite the XML, otherwise the encoding setting is wrong
XDocument resultsDoc = XDocument.Parse(results);
streamWriter = new StreamWriter(responseStream, resultsFormat.Encoding);
resultsDoc.Save(streamWriter);
streamWriter.Flush();
}
else
{
streamWriter = new StreamWriter(responseStream, resultsFormat.Encoding);
streamWriter.Write(results);
streamWriter.Flush();
}
}
public SparqlResultModel(string storeName, IBrightstarService service, SparqlRequestObject sparqlRequest, SparqlResultsFormat resultsFormat, RdfFormat graphFormat)
{
_storeName = storeName;
_sparqlRequest = sparqlRequest;
_service = service;
ResultsFormat = resultsFormat;
GraphFormat = graphFormat;
}
/// <summary>
/// Query a specific commit point of a store
/// </summary>
/// <param name="commitPoint">The commit point be queried</param>
/// <param name="queryExpression">The SPARQL query string</param>
/// <param name="resultsFormat"> </param>
/// <returns>A stream containing XML SPARQL results</returns>
public Stream ExecuteQuery(ICommitPointInfo commitPoint, string queryExpression, SparqlResultsFormat resultsFormat)
{
throw new NotImplementedException();
}
// operations
public void Query(string storeName, string queryExpression, DateTime?ifNotModifiedSince, SparqlResultsFormat resultsFormat, Stream responseStream)
{
try
{
Logging.LogDebug("Query {0} {1}", storeName, queryExpression);
var commitPoint = _storeManager.GetMasterFile(Path.Combine(_baseLocation, storeName)).GetCommitPoints().First();
if (ifNotModifiedSince.HasValue && ifNotModifiedSince > commitPoint.CommitTime)
{
throw new BrightstarStoreNotModifiedException();
}
var cachedResult = GetCachedResult(storeName, commitPoint.CommitTime.Ticks, queryExpression, resultsFormat);
if (cachedResult != null)
{
WriteResults(resultsFormat, responseStream, cachedResult);
return;
}
var storeWorker = GetStoreWorker(storeName);
var results = storeWorker.Query(queryExpression, resultsFormat);
CacheResult(storeName, commitPoint.CommitTime.Ticks, queryExpression, resultsFormat, results);
WriteResults(resultsFormat, responseStream, results);
}
catch (Exception)
{
responseStream.Close();
throw;
}
}
public void Query(string storeName, ulong commitPointId, string queryExpression, SparqlResultsFormat resultsFormat, Stream responseStream)
{
try
{
Logging.LogDebug("Query {0}@{1} {2}", storeName, commitPointId, queryExpression);
var storeLocation = Path.Combine(_baseLocation, storeName);
var masterFile = _storeManager.GetMasterFile(storeLocation);
if (masterFile.PersistenceType == PersistenceType.Rewrite)
{
throw new BrightstarClientException("Query of past commit points is not supported by the binary page persistence type");
}
var commitPoint =
masterFile.GetCommitPoints().FirstOrDefault(c => c.LocationOffset == commitPointId);
if (commitPoint == null)
{
throw new InvalidCommitPointException(String.Format("Could not find commit point {0} for store {1}.", commitPointId, storeName));
}
var cachedResult = GetCachedResult(storeName, commitPoint.CommitTime.Ticks, queryExpression, resultsFormat);
if (cachedResult != null)
{
Logging.LogDebug("Returning cached result for query. Store={0}@{1}, queryExpression={2}", storeName, commitPointId, queryExpression);
WriteResults(resultsFormat, responseStream, cachedResult);
return;
}
var storeWorker = GetStoreWorker(storeName);
var results = storeWorker.Query(commitPointId, queryExpression, resultsFormat);
CacheResult(storeName, commitPoint.CommitTime.Ticks, queryExpression, resultsFormat, results);
WriteResults(resultsFormat, responseStream, results);
}
catch (Exception)
{
responseStream.Close();
throw;
}
}
private void CacheResult(string storeName, long commitTime, string queryString, SparqlResultsFormat format, string results)
{
var key = MakeQueryCacheKey(storeName, commitTime, queryString.GetHashCode(), format);
_queryCache.Insert(key, results, CachePriority.Normal);
}
private string GetCachedResult(string storeName, long commitTime, string queryString, SparqlResultsFormat format)
{
var key = MakeQueryCacheKey(storeName, commitTime, queryString.GetHashCode(), format);
return(_queryCache.Lookup <String>(key));
}
// operations
public void Query(string storeName, string queryExpression, IEnumerable<string> defaultGraphUris, DateTime? ifNotModifiedSince, SparqlResultsFormat resultsFormat, Stream responseStream)
{
try
{
Logging.LogDebug("Query {0} {1}", storeName, queryExpression);
var commitPoint = _storeManager.GetMasterFile(Path.Combine(_baseLocation, storeName)).GetCommitPoints().First();
if (ifNotModifiedSince.HasValue && ifNotModifiedSince > commitPoint.CommitTime)
{
throw new BrightstarStoreNotModifiedException();
}
var g = defaultGraphUris == null ? null : defaultGraphUris.ToArray();
var cacheKey = MakeQueryCacheKey(storeName, commitPoint.CommitTime.Ticks, queryExpression, g, resultsFormat);
var cachedResult = GetCachedResult(cacheKey);
if (cachedResult != null)
{
WriteResults(resultsFormat, responseStream, cachedResult);
return;
}
var storeWorker = GetStoreWorker(storeName);
var results = storeWorker.Query(queryExpression, resultsFormat, g);
CacheResult(cacheKey, results);
WriteResults(resultsFormat, responseStream, results);
}
catch (Exception)
{
#if PORTABLE
System.CloseExtensions.Close(responseStream);
#else
responseStream.Close();
#endif
throw;
}
}
public SparqlQueryResponse(SparqlQueryProcessingModel model, DateTime?ifNotModifiedSince, SparqlResultsFormat format, RdfFormat graphFormat)
{
try
{
ISerializationFormat streamFormat;
var resultStream = model.GetResultsStream(format, graphFormat, ifNotModifiedSince, out streamFormat);
Contents = resultStream.CopyTo;
ContentType = streamFormat.ToString();
StatusCode = HttpStatusCode.OK;
}
catch (InvalidCommitPointException)
{
StatusCode = HttpStatusCode.NotFound;
}
catch (BrightstarStoreNotModifiedException)
{
StatusCode = HttpStatusCode.NotModified;
}
catch (NoSuchStoreException)
{
StatusCode = HttpStatusCode.NotFound;
}
}
public void Query(string storeName, ulong commitPointId, string queryExpression,IEnumerable<string> defaultGraphUris, SparqlResultsFormat resultsFormat, Stream responseStream)
{
try
{
Logging.LogDebug("Query {0}@{1} {2}", storeName, commitPointId, queryExpression);
var g = defaultGraphUris == null ? null : defaultGraphUris.ToArray();
var storeLocation = Path.Combine(_baseLocation, storeName);
var masterFile = _storeManager.GetMasterFile(storeLocation);
if (masterFile.PersistenceType == PersistenceType.Rewrite)
{
throw new BrightstarClientException("Query of past commit points is not supported by the binary page persistence type");
}
var commitPoint =
masterFile.GetCommitPoints().FirstOrDefault(c => c.LocationOffset == commitPointId);
if (commitPoint == null)
{
throw new InvalidCommitPointException(String.Format("Could not find commit point {0} for store {1}.", commitPointId, storeName));
}
var cacheKey = MakeQueryCacheKey(storeName, commitPoint.CommitTime.Ticks, queryExpression, g, resultsFormat);
var cachedResult = GetCachedResult(cacheKey);
if (cachedResult != null)
{
Logging.LogDebug("Returning cached result for query. Store={0}@{1}, queryExpression={2}", storeName, commitPointId, queryExpression);
WriteResults(resultsFormat, responseStream, cachedResult);
return;
}
var storeWorker = GetStoreWorker(storeName);
var results = storeWorker.Query(commitPointId, queryExpression, resultsFormat, g);
CacheResult(cacheKey, results);
WriteResults(resultsFormat, responseStream, results);
}
catch(Exception)
{
#if PORTABLE
System.CloseExtensions.Close(responseStream);
#else
responseStream.Close();
#endif
throw;
}
}
public ActionResult Query(string storename, string query)
{
// Determine what results format to return to the client
string bestMimeType = MimeParse.MimeParse.BestMatch(SparqlResultsFormat.AllMediaTypes.ToList(),
Request.Headers["Accept"]);
var callback = Request["callback"];
if (!String.IsNullOrEmpty(callback) && Request.Headers["Accept"].Contains("*/*"))
{
// Workaround for jQuery clients that will send Accept */* for a JSONP request
bestMimeType = SparqlResultsFormat.Json.MediaTypes[0];
}
SparqlResultsFormat resultsFormat = null;
if (!String.IsNullOrEmpty(bestMimeType))
{
resultsFormat = SparqlResultsFormat.GetResultsFormat(bestMimeType);
}
if (resultsFormat == null)
{
throw new HttpException(406, "Not Acceptable");
}
if (query == null && Request.HttpMethod.ToLower().Equals("post") && Request.ContentType.Equals("application/sparql-query"))
{
try
{
string q;
using (var streamReader = new StreamReader(Request.InputStream))
{
q = streamReader.ReadToEnd();
if (string.IsNullOrEmpty(q))
{
throw new HttpException(400, "No query in request body");
}
}
// Execute the query
var client = BrightstarService.GetClient();
var results = client.ExecuteQuery(storename, q, DateTime.MinValue, resultsFormat);
return(new FileStreamResult(results, resultsFormat.ToString()));
}
catch (Exception ex)
{
throw new HttpException(500, "Unable to execute query " + ex.Message, ex);
}
}
if (query != null)
{
try
{
var client = BrightstarService.GetClient();
if (resultsFormat.DefaultExtension.Equals(SparqlResultsFormat.Json.DefaultExtension) && !String.IsNullOrEmpty(callback))
{
// Handle JSONP request
var results = client.ExecuteQuery(storename, query, DateTime.MinValue, resultsFormat);
using (var stringReader = new StreamReader(results))
{
var rawJson = stringReader.ReadToEnd();
return(new ContentResult
{
ContentType = bestMimeType,
Content = callback + "(" + rawJson + ");",
ContentEncoding = Encoding.UTF8
});
}
}
else
{
var results = client.ExecuteQuery(storename, query, DateTime.MinValue, resultsFormat);
return(new FileStreamResult(results, resultsFormat.ToString()));
}
}
catch (Exception ex)
{
throw new HttpException(500, "Unable to execute query " + ex.Message, ex);
}
}
MimeParse.MimeParse.BestMatch(new []
{
"application/xbel+xml",
"text/xml"
}, "text/*;q=0.5,*; q=0.1"); // 'text/xml'
throw new HttpException(400, "Missing parameters or incorrect request format");
}
private static string MakeQueryCacheKey(string storeName, long commitTime, string query, IEnumerable<string> defaultGraphUris, SparqlResultsFormat format)
{
var graphHashCode = defaultGraphUris == null ? 0 : String.Join(",", defaultGraphUris).GetHashCode();
return storeName + "_" + commitTime + "_" + query.GetHashCode() + "_" + graphHashCode + "." +
format.DefaultExtension;
}
private static void TestSparqlPostSucceeds(string storeName, string query, IEnumerable <string> defaultGraphUris, IEnumerable <string> namedGraphUris, MediaRange accept, SparqlResultsFormat expectedQueryFormat, Action <Mock <IBrightstarService> > brightstarSetup)
{
// Setup
var brightstar = new Mock <IBrightstarService>();
ISerializationFormat format = expectedQueryFormat;
brightstar.Setup(s => s.ExecuteQuery(storeName, query, defaultGraphUris, null, expectedQueryFormat, It.IsAny <RdfFormat>(), out format))
.Returns(new MemoryStream(Encoding.UTF8.GetBytes("Mock Results")))
.Verifiable();
if (brightstarSetup != null)
{
brightstarSetup(brightstar);
}
var app = new Browser(new FakeNancyBootstrapper(brightstar.Object));
// Execute
var response = app.Post("/" + storeName + "/sparql", with =>
{
with.Body(query);
with.Header("Content-Type", "application/sparql-query");
if (defaultGraphUris != null)
{
foreach (var defaultGraphUri in defaultGraphUris)
{
with.Query("default-graph-uri", defaultGraphUri);
}
}
if (namedGraphUris != null)
{
foreach (var namedGraphUri in namedGraphUris)
{
with.Query("named-graph-uri", namedGraphUri);
}
}
with.Accept(accept);
});
Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
Assert.That(accept.Matches(new MediaRange(response.ContentType)));
Assert.That(response.Body.AsString(), Is.EqualTo("Mock Results"));
brightstar.Verify();
}
/// <summary>
/// Query the store using a SPARQL query
/// </summary>
/// <param name="storeName">The name of the store to query</param>
/// <param name="queryExpression">SPARQL query string</param>
/// <param name="defaultGraphUri">The URI of the graph that will be the default graph for the query</param>
/// <param name="ifNotModifiedSince">OPTIONAL : If this parameter is provided and the store has not been changed since the time specified,
/// a BrightstarClientException will be raised with the message "Store not modified".</param>
/// <param name="resultsFormat">OPTIONAL: Specifies the serialization format for the SPARQL results. Defaults to <see cref="SparqlResultsFormat.Xml"/></param>
/// <returns>A stream containing XML SPARQL result XML</returns>
public Stream ExecuteQuery(string storeName, string queryExpression, string defaultGraphUri,
DateTime? ifNotModifiedSince = null, SparqlResultsFormat resultsFormat = null)
{
if (defaultGraphUri == null)
{
throw new ArgumentNullException("defaultGraphUri", Strings.BrightstarServiceClient_QueryDefaultGraphUriMustNotBeNull);
}
return ExecuteQuery(storeName, queryExpression, new string[] {defaultGraphUri}, ifNotModifiedSince,
resultsFormat);
}
/// <summary>
/// Query the store using a SPARQL query
/// </summary>
/// <param name="storeName">The name of the store to query</param>
/// <param name="queryExpression">SPARQL query string</param>
/// <param name="defaultGraphUris">An enumeration over the URIs of the graphs that will be taken together as the default graph for the query</param>
/// <param name="ifNotModifiedSince">OPTIONAL : If this parameter is provided and the store has not been changed since the time specified,
/// a BrightstarClientException will be raised with the message "Store not modified".</param>
/// <param name="resultsFormat">OPTIONAL: Specifies the serialization format for the SPARQL results. Defaults to <see cref="SparqlResultsFormat.Xml"/></param>
/// <param name="graphFormat">OPTIONAL: Specifies the serialization format for RDF graph results. Defaults to <see cref="RdfFormat.RdfXml"/></param>
/// <returns>A stream containing XML SPARQL result XML</returns>
public Stream ExecuteQuery(string storeName, string queryExpression, IEnumerable<string> defaultGraphUris,
DateTime? ifNotModifiedSince = null,
SparqlResultsFormat resultsFormat = null, RdfFormat graphFormat = null)
{
ISerializationFormat streamFormat;
return ExecuteQuery(storeName, queryExpression, defaultGraphUris, ifNotModifiedSince,
resultsFormat ?? SparqlResultsFormat.Xml, graphFormat ?? RdfFormat.RdfXml,
out streamFormat);
}
/// <summary>
/// Query a specific commit point of a store
/// </summary>
/// <param name="commitPoint">The commit point be queried</param>
/// <param name="queryExpression">The SPARQL query string</param>
/// <param name="resultsFormat">OPTIONAL: Specifies the serialization format for the SPARQL results. Defaults to <see cref="SparqlResultsFormat.Xml"/></param>
/// <returns>A stream containing XML SPARQL results</returns>
public Stream ExecuteQuery(ICommitPointInfo commitPoint, string queryExpression,
SparqlResultsFormat resultsFormat = null)
{
return ExecuteQuery(commitPoint, queryExpression, (IEnumerable<string>) null, resultsFormat);
}
/// <summary>
/// Query a specific commit point of a store
/// </summary>
/// <param name="storeName">The name of the store to query</param>
/// <param name="queryExpression">The SPARQL query string</param>
/// <param name="ifNotModifiedSince">OPTIONAL : If this parameter has a value and the store has not been changed since the time specified,
/// a <see cref="BrightstarStoreNotModifiedException"/> will be raised with the message "Store not modified".</param>
/// <param name="defaultGraphUris">An enumeration over the URIs of the graphs that will be taken together as the default graph for the query. May be NULL to use the built-in default graph</param>
/// <param name="resultsFormat">Specifies the serialization format for the SPARQL result set returned by the query. May be NULL to indicate that an RDF graph is the expected result.</param>
/// <param name="graphFormat">Specifies the serialization format for the RDF graph returned by the query. May be NULL to indicate that a SPARQL results set is the expected result.</param>
/// <param name="streamFormat">Specifies the serialization format used in the returned <see cref="Stream"/>.</param>
/// <returns>A stream containing the results of executing the query</returns>
public Stream ExecuteQuery(string storeName, string queryExpression, IEnumerable<string> defaultGraphUris, DateTime? ifNotModifiedSince,
SparqlResultsFormat resultsFormat, RdfFormat graphFormat, out ISerializationFormat streamFormat)
{
if (storeName == null) throw new ArgumentNullException("storeName");
if (queryExpression == null) throw new ArgumentNullException("queryExpression");
if (resultsFormat == null && graphFormat == null) throw new ArgumentException("Either resultsFormat or graphFormat must be non-NULL");
if (!_serverCore.DoesStoreExist(storeName)) throw new NoSuchStoreException(storeName);
try
{
var pStream = new MemoryStream();
streamFormat = _serverCore.Query(storeName, queryExpression,
defaultGraphUris == null ? null : defaultGraphUris.Where(x => !string.IsNullOrEmpty(x)),
ifNotModifiedSince, resultsFormat,
graphFormat, pStream);
return new MemoryStream(pStream.ToArray());
}
catch (BrightstarStoreNotModifiedException)
{
throw;
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ServerCoreException, "Error Executing Query {0} {1}", storeName, queryExpression);
throw new BrightstarClientException("Error querying store " + storeName + " with expression " + queryExpression + ". " + ex.Message, ex);
}
}
public Stream ExecuteQuery(ICommitPointInfo commitPoint, string queryExpression, IEnumerable<string> defaultGraphUris, SparqlResultsFormat resultsFormat = null)
{
if (commitPoint == null) throw new ArgumentNullException("commitPoint");
if (queryExpression == null)
throw new ArgumentNullException("queryExpression", Strings.BrightstarServiceClient_QueryMustNotBeNull);
if (String.Empty.Equals(queryExpression))
throw new ArgumentException(Strings.BrightstarServiceClient_QueryMustNotBeEmptyString, "queryExpression");
try
{
return _service.ExecuteQueryOnCommitPoint(
new CommitPointInfo
{
Id = commitPoint.Id,
StoreName = commitPoint.StoreName,
CommitTime = commitPoint.CommitTime,
JobId = commitPoint.JobId
},
queryExpression,
defaultGraphUris == null ? null : defaultGraphUris.ToArray(),
resultsFormat == null ? SparqlResultsFormat.Xml.MediaTypes.First() + "; charset=utf-8" : resultsFormat.ToString());
}
catch (FaultException<ExceptionDetail> fault)
{
throw new BrightstarClientException(fault);
}
}
/// <summary>
/// Query a specific commit point of a store
/// </summary>
/// <param name="commitPoint">The commit point be queried</param>
/// <param name="queryExpression">The SPARQL query string</param>
/// <param name="defaultGraphUris">OPTIONAL: An enumeration over the URIs of the graphs that will be taken together as the default graph for the query. May be NULL to use the built-in default graph</param>
/// <param name="resultsFormat">OPTIONAL: Specifies the serialization format for the SPARQL results. Defaults to <see cref="SparqlResultsFormat.Xml"/></param>
/// <param name="graphFormat">OPTIONAL: Specifies the serialization format for RDF graph results. Defaults to <see cref="RdfFormat.RdfXml"/></param>
/// <returns>A stream containing XML SPARQL results</returns>
public Stream ExecuteQuery(ICommitPointInfo commitPoint, string queryExpression,
IEnumerable<string> defaultGraphUris,
SparqlResultsFormat resultsFormat = null, RdfFormat graphFormat = null)
{
ISerializationFormat streamFormat;
return ExecuteQuery(commitPoint, queryExpression, defaultGraphUris,
resultsFormat ?? SparqlResultsFormat.Xml, graphFormat ?? RdfFormat.RdfXml,
out streamFormat);
}
public ISerializationFormat Query(string storeName, ulong commitPointId, string queryExpression,
IEnumerable<string> defaultGraphUris,
SparqlResultsFormat sparqlResultFormat, RdfFormat graphFormat,
Stream responseStream)
{
Logging.LogDebug("Query {0}@{1} {2}", storeName, commitPointId, queryExpression);
var g = defaultGraphUris == null ? null : defaultGraphUris.ToArray();
var storeLocation = Path.Combine(_baseLocation, storeName);
var masterFile = _storeManager.GetMasterFile(storeLocation);
if (masterFile.PersistenceType == PersistenceType.Rewrite)
{
throw new BrightstarClientException(
"Query of past commit points is not supported by the binary page persistence type");
}
var commitPoint =
masterFile.GetCommitPoints().FirstOrDefault(c => c.LocationOffset == commitPointId);
if (commitPoint == null)
{
throw new InvalidCommitPointException(String.Format("Could not find commit point {0} for store {1}.",
commitPointId, storeName));
}
var query = ParseSparql(queryExpression);
var targetFormat = QueryReturnsGraph(query) ? (ISerializationFormat)graphFormat : sparqlResultFormat;
var cacheKey = MakeQueryCacheKey(storeName, commitPoint.CommitTime.Ticks, query, g, targetFormat);
var cachedResult = GetCachedResult(cacheKey);
if (cachedResult == null)
{
var storeWorker = GetStoreWorker(storeName);
var cacheStream = new MemoryStream();
storeWorker.Query(commitPointId, query, targetFormat, cacheStream, g);
cachedResult = CacheResult(cacheKey, cacheStream.ToArray());
}
cachedResult.WriteTo(responseStream);
return targetFormat;
}
/// <summary>
/// Query a specific commit point of a store
/// </summary>
/// <param name="commitPoint">The commit point be queried</param>
/// <param name="queryExpression">The SPARQL query string</param>
/// <param name="defaultGraphUris">An enumeration over the URIs of the graphs that will be taken together as the default graph for the query. May be NULL to use the built-in default graph</param>
/// <param name="resultsFormat">Specifies the serialization format for the SPARQL result set returned by the query. May be NULL to indicate that an RDF graph is the expected result.</param>
/// <param name="graphFormat">Specifies the serialization format for the RDF graph returned by the query. May be NULL to indicate that a SPARQL results set is the expected result.</param>
/// <param name="streamFormat">Specifies the serialization format used in the returned <see cref="Stream"/>.</param>
/// <returns>A stream containing the results of executing the query</returns>
public Stream ExecuteQuery(ICommitPointInfo commitPoint, string queryExpression, IEnumerable<string> defaultGraphUris,
SparqlResultsFormat resultsFormat, RdfFormat graphFormat, out ISerializationFormat streamFormat)
{
if (queryExpression == null) throw new ArgumentNullException("queryExpression");
if (resultsFormat == null) resultsFormat = SparqlResultsFormat.Xml;
if (graphFormat == null) graphFormat = RdfFormat.RdfXml;
try
{
var pStream = new MemoryStream();
streamFormat = _serverCore.Query(commitPoint.StoreName, commitPoint.Id, queryExpression, defaultGraphUris, resultsFormat, graphFormat, pStream);
return new MemoryStream(pStream.ToArray());
}
#if !PORTABLE && !WINDOWS_PHONE
catch (AggregateException aggregateException)
{
Logging.LogError(BrightstarEventId.ServerCoreException,
"Error querying store {0}@{1} with expression {2}", commitPoint.StoreName,
commitPoint.Id, queryExpression);
if (aggregateException.InnerExceptions.Count == 1)
{
throw new BrightstarClientException(
String.Format("Error querying store {0}@{1} with expression {2}. {3}",
commitPoint.StoreName, commitPoint.Id, queryExpression,
aggregateException.InnerExceptions[0].Message));
}
var messages = String.Join("; ", aggregateException.InnerExceptions.Select(ex => ex.Message));
throw new BrightstarClientException(
String.Format(
"Error querying store {0}@{1} with expression {2}. Multiple errors occurred: {3}",
commitPoint.StoreName, commitPoint.Id, queryExpression, messages));
}
#endif
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ServerCoreException,
"Error querying store {0}@{1} with expression {2}", commitPoint.StoreName,
commitPoint.Id, queryExpression);
throw new BrightstarClientException(
String.Format("Error querying store {0}@{1} with expression {2}. {3}", commitPoint.StoreName,
commitPoint.Id, queryExpression, ex.Message), ex);
}
}
private static void TestSparqlPostSucceeds(string storeName, string query, IEnumerable<string> defaultGraphUris, IEnumerable<string> namedGraphUris, MediaRange accept, SparqlResultsFormat expectedQueryFormat, Action<Mock<IBrightstarService>> brightstarSetup)
{
// Setup
var brightstar = new Mock<IBrightstarService>();
brightstar.Setup(s => s.ExecuteQuery(storeName, query, defaultGraphUris, null, expectedQueryFormat))
.Returns(new MemoryStream(Encoding.UTF8.GetBytes("Mock Results")))
.Verifiable();
if (brightstarSetup != null) brightstarSetup(brightstar);
var app = new Browser(new FakeNancyBootstrapper(brightstar.Object));
// Execute
var response = app.Post("/" + storeName + "/sparql", with =>
{
with.Body(query);
with.Header("Content-Type", "application/sparql-query");
if (defaultGraphUris != null)
{
foreach (var defaultGraphUri in defaultGraphUris)
{
with.Query("default-graph-uri", defaultGraphUri);
}
}
if (namedGraphUris != null)
{
foreach (var namedGraphUri in namedGraphUris)
{
with.Query("named-graph-uri", namedGraphUri);
}
}
with.Accept(accept);
});
Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
Assert.That(response.ContentType, Is.EqualTo(accept.ToString()));
Assert.That(response.Body.AsString(), Is.EqualTo("Mock Results"));
brightstar.Verify();
}
private static string MakeQueryCacheKey(string storeName, long commitTime, int queryHashcode, SparqlResultsFormat format)
{
return(storeName + "_" + commitTime + "_" + queryHashcode + "." + format.DefaultExtension);
}
