private void PostTransaction(string existencePreconditions, string nonexistencePreconditions, string patternsToDelete, string triplesToAdd, string defaultGraphUri)
{
var jobInfo = _client.ExecuteTransaction(_storeName,
new UpdateTransactionData
{
ExistencePreconditions = existencePreconditions,
NonexistencePreconditions = nonexistencePreconditions,
DeletePatterns = patternsToDelete,
InsertData = triplesToAdd,
DefaultGraphUri = defaultGraphUri
});
while (!(jobInfo.JobCompletedOk || jobInfo.JobCompletedWithErrors))
{
#if PORTABLE
// Very rudimentary synchronous wait
var ev = new ManualResetEvent(false);
ev.WaitOne(200);
#else
Thread.Sleep(20);
#endif
jobInfo = _client.GetJobInfo(_storeName, jobInfo.JobId);
}
if (jobInfo.JobCompletedWithErrors)
{
// if (jobInfo.ExceptionInfo.Type == typeof(Server.PreconditionFailedException).FullName)
if (jobInfo.ExceptionInfo != null && jobInfo.ExceptionInfo.Type == "BrightstarDB.Server.PreconditionFailedException")
{
throw TransactionPreconditionsFailedException.FromExceptionDetail(jobInfo.ExceptionInfo);
}
throw new BrightstarClientException("Error processing update transaction. " + jobInfo.StatusMessage);
}
}
/// <summary>
/// Commits all changes. Waits for the operation to complete.
/// </summary>
protected override void DoSaveChanges()
{
if (_optimisticLockingEnabled)
{
// get subject entity and see if there is a version triple
var subjects = AddTriples.Subjects
.Union(DeletePatterns.Subjects)
.Except(new[] { Constants.WildcardUri }).ToList();
foreach (var subject in subjects)
{
var entity = LookupDataObject(subject);
if (entity == null)
{
throw new BrightstarClientException("No Entity Found for Subject " + subject);
}
var version = entity.GetPropertyValue(Constants.VersionPredicateUri);
if (version == null)
{
// no existing version information so assume this is the first time using it with 1
entity.SetProperty(Constants.VersionPredicateUri, 1);
}
else
{
var intVersion = Convert.ToInt32(version);
// inc version
intVersion++;
entity.SetProperty(Constants.VersionPredicateUri, intVersion);
Preconditions.Add(new Triple
{
Graph = VersionGraphUri,
DataType = RdfDatatypes.Integer,
IsLiteral = true,
LangCode = null,
Object = version.ToString(),
Predicate = Constants.VersionPredicateUri,
Subject = subject
});
}
}
}
var deleteData = new StringWriter();
var dw = new BrightstarTripleSinkAdapter(new NQuadsWriter(deleteData));
foreach (var triple in DeletePatterns.Items)
{
dw.Triple(triple);
}
deleteData.Close();
var addData = new StringWriter();
var aw = new BrightstarTripleSinkAdapter(new NQuadsWriter(addData));
foreach (var triple in AddTriples.Items)
{
aw.Triple(triple);
}
addData.Close();
var preconditionsData = new StringWriter();
var pw = new BrightstarTripleSinkAdapter(new NQuadsWriter(preconditionsData));
foreach (var triple in Preconditions.Items)
{
pw.Triple(triple);
}
preconditionsData.Close();
var nePreconditionsData = new StringWriter();
var nw = new BrightstarTripleSinkAdapter(new NQuadsWriter(nePreconditionsData));
foreach (var triple in NonExistencePreconditions.Items)
{
nw.Triple(triple);
}
nePreconditionsData.Close();
var jobId = _serverCore.ProcessTransaction(_storeName, preconditionsData.ToString(),
nePreconditionsData.ToString(),
deleteData.ToString(), addData.ToString(), UpdateGraphUri);
var status = _serverCore.GetJobStatus(_storeName, jobId.ToString());
status.WaitEvent.WaitOne();
// while (!(status.JobStatus == JobStatus.CompletedOk || status.JobStatus == JobStatus.TransactionError))
// {
// // wait for completion.
//#if !PORTABLE
// Thread.Sleep(5);
//#endif
// status = _serverCore.GetJobStatus(_storeName, jobId.ToString());
// }
if (status.JobStatus == JobStatus.TransactionError)
{
if (status.ExceptionDetail.Type.Equals(typeof(PreconditionFailedException).FullName))
{
Preconditions.Clear();
throw TransactionPreconditionsFailedException.FromExceptionDetail(status.ExceptionDetail);
}
throw new BrightstarClientException(status.ExceptionDetail != null && !String.IsNullOrEmpty(status.ExceptionDetail.Message) ? status.ExceptionDetail.Message : "The transaction encountered an error");
}
if (status.JobStatus != JobStatus.CompletedOk)
{
throw new BrightstarClientException("Unexpected job status on completion: " + status.JobStatus + ". Last message was: " + status.Information);
}
// reset changes
ResetTransactionData();
}