/// <summary>
/// Queries a given commit point of a store using a SPARQL query
/// </summary>
/// <param name="commitPoint">The store commit point to be queried</param>
/// <param name="queryExpression">The SPARQL query string</param>
/// <param name="resultsMediaType">The media type for the serialization of the SPARQL results</param>
/// <returns>A stream containing the serialized query results</returns>
public Stream ExecuteQueryOnCommitPoint(CommitPointInfo commitPoint, string queryExpression, string resultsMediaType = null)
{
try
{
var resultsFormat = resultsMediaType == null ? SparqlResultsFormat.Xml : SparqlResultsFormat.GetResultsFormat(resultsMediaType);
var pstream = new MemoryStream();
var t = new Task(() => ServerCore.Query(commitPoint.StoreName, commitPoint.Id, queryExpression, resultsFormat, pstream));
t.Start();
t.Wait();
if (t.IsFaulted && t.Exception != null) throw t.Exception;
var cStream = new MemoryStream(pstream.GetBuffer(), 0, (int) pstream.Length);
return cStream;
}
catch (Exception ex)
{
Logging.LogError(BrightstarDB.BrightstarEventId.ServerCoreException, "Error executing query {0}@{1} {2}", commitPoint.StoreName, commitPoint.Id, queryExpression);
throw new BrightstarClientException(
String.Format("Error executing query {0}@{1} {2}. {3}", commitPoint.StoreName, commitPoint.Id,
queryExpression, ex.Message), ex);
}
}
public void RevertToCommitPoint(string storeName, CommitPointInfo commitPoint)
{
try
{
ServerCore.RevertToCommitPoint(storeName, commitPoint.Id);
}
catch (Exception ex)
{
Logging.LogError(BrightstarDB.BrightstarEventId.ServerCoreException, "Error getting commit points for store {0}", storeName);
throw new BrightstarClientException("Error getting commit points for store " + storeName + ". " + ex.Message, ex);
}
}
public JobInfo CreateSnapshot(string sourceStoreName, string targetStoreName, PersistenceType persistenceType, CommitPointInfo sourceCommitPoint)
{
try
{
var jobId = ServerCore.CreateSnapshot(sourceStoreName, targetStoreName, persistenceType, sourceCommitPoint == null ? StoreConstants.NullUlong : sourceCommitPoint.Id);
return new JobInfo {JobId = jobId.ToString(), JobPending = true};
}
catch (Exception ex)
{
Logging.LogError(BrightstarEventId.ServerCoreException,
"Error starting snapshot for store {0}", sourceStoreName);
throw new BrightstarClientException(
"Error starting snapshot for store " + sourceStoreName + ". " + ex.Message, ex);
}
}
