/// <summary>
/// When overridden in a derived class, reads a message from a specified stream.
/// </summary>
/// <returns>
/// The <see cref="T:System.ServiceModel.Channels.Message"/> that is read from the stream specified.
/// </returns>
/// <param name="stream">The <see cref="T:System.IO.Stream"/> object from which the message is read.</param><param name="maxSizeOfHeaders">The maximum size of the headers that can be read from the message.</param><param name="contentType">The Multipurpose Internet Mail Extensions (MIME) message-level content-type.</param>
public override Message ReadMessage(System.IO.Stream stream, int maxSizeOfHeaders, string contentType)
{
var message = new PqlMessage(stream, null);
message.ReadHeaders();
return(message);
}
/// <summary>
/// When overridden in a derived class, reads a message from a specified stream.
/// </summary>
/// <returns>
/// The <see cref="T:System.ServiceModel.Channels.Message"/> that is read from the stream specified.
/// </returns>
/// <param name="stream">The <see cref="T:System.IO.Stream"/> object from which the message is read.</param><param name="maxSizeOfHeaders">The maximum size of the headers that can be read from the message.</param><param name="contentType">The Multipurpose Internet Mail Extensions (MIME) message-level content-type.</param>
public override Message ReadMessage(System.IO.Stream stream, int maxSizeOfHeaders, string contentType)
{
var message = new PqlMessage(stream, null);
message.ReadHeaders();
return message;
}
public void Attach(PqlMessage requestMessage, IDataEngine dataEngine, IPqlClientSecurityContext authContext)
{
if (dataEngine == null)
{
throw new ArgumentNullException("dataEngine");
}
if (authContext == null)
{
throw new ArgumentNullException("authContext");
}
m_executionContext.AssertIsClean();
m_executionContext.AttachInputMessage(requestMessage, dataEngine, authContext);
}
private PqlMessage SendCommand(IDataService channel, DataRequest dataRequest, DataRequestParams dataRequestParams, DataRequestBulk dataRequestBulk)
{
var authContext = m_connection.ClientSecurityContext;
if (authContext == null)
{
throw new InvalidOperationException("Authentication context is not set on the thread");
}
if (string.IsNullOrWhiteSpace(authContext.TenantId))
{
throw new InvalidOperationException("Current authentication context does not have value for TenantId");
}
Message responseMessage;
using (var holder = PqlDataConnection.CommandStreams.Take(m_connection.CancellationTokenSource.Token))
{
holder.Item.Attach(dataRequest, dataRequestParams, dataRequestBulk);
var requestMessage = new PqlMessage(
holder.Item, new IDisposable[] {holder},
AuthContextSerializer.GetString(authContext),
m_connection.ConnectionProps.ScopeId,
m_connection.ConnectionProps.ProtocolVersion);
responseMessage = channel.Process(requestMessage);
}
var pqlMessage = responseMessage as PqlMessage;
if (pqlMessage != null)
{
return pqlMessage;
}
throw new DataException(string.Format(
"Message must be of type {0}. Actual type that came from WCF transport was {1}",
typeof(PqlMessage).AssemblyQualifiedName,
responseMessage.GetType().AssemblyQualifiedName));
}
public void Cleanup()
{
m_authContext = null;
m_lastError = null;
m_requestMessage = null;
m_engine = null;
ResponseHeaders = null;
RecordsAffected = 0;
TotalRowsProduced = 0;
DriverOutputBuffer = null;
InputDataEnumerator = null;
ClauseEvaluationContext = null;
OutputDataBuffer = null;
Completion = null;
ContainerDescriptor = null;
CacheInfo = null;
Request.Clear();
RequestBulk.Clear();
RequestParameters.Clear();
ParsedRequest.Clear();
var cancellation = Interlocked.CompareExchange(ref m_cancellationTokenSource, null, m_cancellationTokenSource);
if (cancellation != null)
{
cancellation.Cancel();
}
var ring = Interlocked.CompareExchange(ref m_buffersRing, null, m_buffersRing);
if (ring != null)
{
ring.Dispose();
}
var items = m_buffersRingItems; // do not replace with null
if (items != null)
{
foreach (var item in items)
{
item.Cleanup();
}
}
}
public void AttachInputMessage(PqlMessage requestMessage, IDataEngine engine, IPqlClientSecurityContext authContext)
{
if (requestMessage == null)
{
throw new ArgumentNullException("requestMessage");
}
if (engine == null)
{
throw new ArgumentNullException("engine");
}
if (authContext == null)
{
throw new ArgumentNullException("authContext");
}
AssertIsClean();
ClauseEvaluationContext = new ClauseEvaluationContext();
m_authContext = authContext;
m_requestMessage = requestMessage;
m_engine = engine;
m_cancellationTokenSource = new CancellationTokenSource();
// re-initialize the ring, for fault tolerance in case if previous processor fails to release items
m_buffersRing = new DataRing<RequestExecutionBuffer>(m_buffersRingItems.Length, m_buffersRingItems.Length);
foreach (var item in m_buffersRingItems)
{
// make all buffers available to producer
m_buffersRing.AddTaskForProcessing(item, m_cancellationTokenSource.Token);
}
}