internal static string CheckConversationForErrorMessage(string connstr, Guid conversationHandle)
{
using (SqlConnection con = SsbHelper.GetConnection(connstr))
{
con.Open();
return(CheckConversationForErrorMessage(con, conversationHandle));
}
}
internal static ServiceInfo GetServiceInfo(string serviceName, TimeSpan timeout, string connstr)
{
using (SqlConnection con = SsbHelper.GetConnection(connstr))
{
con.Open();
return(GetServiceInfo(serviceName, timeout, con));
}
}
public static int EndAllConversationsWithCleanup(string connstr)
{
using (SqlConnection con = SsbHelper.GetConnection(connstr))
{
con.Open();
return(EndAllConversationsWithCleanup(con));
}
}
public static void EndConversationWithCleanup(string connstr, Guid conversationHandle)
{
using (SqlConnection con = SsbHelper.GetConnection(connstr))
{
con.Open();
EndConversationWithCleanup(con, conversationHandle);
}
}
internal static void SetConversationTimer(Guid conversationHandle, TimeSpan timerTimeout, string connstr)
{
using (SqlConnection con = SsbHelper.GetConnection(connstr))
{
con.Open();
SetConversationTimer(conversationHandle, timerTimeout, con);
}
}
internal static ConversationInfo GetConversationInfo(Guid conversationHandle, string constr)
{
using (SqlConnection con = SsbHelper.GetConnection(constr))
{
con.Open();
return(GetConversationInfo(conversationHandle, con));
}
}
internal void Send(byte[] buffer, TimeSpan timeout, string messageType)
{
ThrowIfDisposedOrNotOpen();
TimeoutHelper helper = new TimeoutHelper(timeout);
//if the client hasn't explicitly begun a conversation, start one here.
// CONSIDER (dbrowne) automatically ending the conversation in this case.
if (conversation == null)
{
BeginNewConversation();
this.endConversationOnClose = true;
}
try
{
string SQL = string.Format(@"SEND ON CONVERSATION @Conversation MESSAGE TYPE [{0}](@MessageBody)", SsbHelper.ValidateIdentifier(messageType));
SqlCommand cmd = new SqlCommand(SQL, con);
cmd.CommandTimeout = helper.RemainingTimeInMillisecondsOrZero();
SqlParameter pConversation = cmd.Parameters.Add("@Conversation", SqlDbType.UniqueIdentifier);
pConversation.Value = this.conversation.ConversationHandle;
SqlParameter pMessageBody = cmd.Parameters.Add("@MessageBody", SqlDbType.VarBinary);
pMessageBody.Value = buffer;
try
{
cmd.ExecuteNonQuery();
}
catch (SqlException ex)
{
if (ex.Number == 8429)
{
string errorMessage = SsbHelper.CheckConversationForErrorMessage(con, this.conversation.ConversationHandle);
if (errorMessage != null)
{
throw new Exception(errorMessage);
}
throw;
}
throw;
}
SsbInstrumentation.MessageSent(buffer.Length);
}
catch (Exception e)
{
if (!helper.IsTimeRemaining)
{
throw new TimeoutException("Timed out while sending a message. The timeout value passed in was " + timeout.TotalSeconds + " seconds");
}
else
{
throw new CommunicationException(String.Format("An exception occurred while sending on conversation {0}.", this.conversation.ConversationHandle), e);
}
}
}
protected override void OnOpen(TimeSpan timeout)
{
TimeoutHelper helper = new TimeoutHelper(timeout);
if (this.con == null)
{
this.con = SsbHelper.GetConnection(this.connectionString);
con.Open();
this.ownsConnection = true;
}
}
public Guid BeginNewConversation(Guid conversationGroupId, TimeSpan timeout)
{
ThrowIfDisposedOrNotOpen();
endConversationOnClose = false; //if a conversation is explicitly started, don't automatically close it.
TimeoutHelper helper = new TimeoutHelper(timeout);
try
{
string SQL = string.Format(
@"BEGIN DIALOG CONVERSATION @ConversationHandle
FROM SERVICE @Source TO SERVICE @Target
ON CONTRACT [{0}] WITH ENCRYPTION = {1}", contract, useEncryption?"ON":"OFF");
if (conversationGroupId != Guid.Empty)
{
SQL += String.Format(", RELATED_CONVERSATION_GROUP = '{0}'", conversationGroupId);
}
SqlCommand cmd = new SqlCommand(SQL, con);
cmd.CommandTimeout = helper.RemainingTimeInMillisecondsOrZero();
SqlParameter pconversationHandle = cmd.Parameters.Add("@ConversationHandle", SqlDbType.UniqueIdentifier);
pconversationHandle.Direction = ParameterDirection.Output;
SqlParameter pTarget = cmd.Parameters.Add("@Target", SqlDbType.VarChar);
pTarget.Value = this.target;
SqlParameter pSource = cmd.Parameters.Add("@Source", SqlDbType.VarChar);
pSource.Value = this.source;
cmd.ExecuteNonQuery();
this.conversation = SsbHelper.GetConversationInfo((Guid)pconversationHandle.Value, con);
return(this.conversation.ConversationHandle);
}
catch (SqlException ex)
{
if (!helper.IsTimeRemaining)
{
throw new TimeoutException(String.Format("Timed out while beginning new conversation to service {0}. Timeout value was {1} seconds", this.target, timeout.TotalSeconds), ex);
}
else
{
throw new CommunicationException(String.Format("An exception occurred while beginning new conversation to service {0}", this.target), ex);
}
}
finally
{
}
}
internal SsbConversationGroupReceiver AcceptConversationGroup(TimeSpan timeout)
{
TimeoutHelper helper = new TimeoutHelper(timeout);
try
{
//create a transaction to own the conversation. Open the SqlConnection while
//the transaction is current, so all the work on the connection will be enlisted
//in the transaction. SqlTransaction doesn't work this way. It requires every command
//to be manually enlisted, yuck.
//As an alternative you could simply issue a new SqlCommand("begin transaction",cn).ExecuteNonQuery()
//to start a transaction.
// TODO (dbrowne) Consider whether to allow service-level code to commit this transaction, or, alternatively,
//commit the transaction after the last conversation message in this session is processed.
//If service-level code is allowed to commit the transaction then SsbConversationGroupReciver _must_
//retrieve only a single message in each batch. Else it could fetch 2 messages and risk the service-level
//commiting after the first message.
CommittableTransaction tx = new CommittableTransaction(TimeSpan.MaxValue);
Transaction currentTrans = Transaction.Current;
Transaction.Current = tx;
SqlConnection cn = SsbHelper.GetConnection(this.connstring);
cn.Open();
Transaction.Current = currentTrans;
tx.TransactionCompleted += new TransactionCompletedEventHandler(tx_TransactionCompleted);
//wait for a new message, but if that message is in a conversation group that another SsbChannelListener is waiting on
//then roll back the conversation group lock and get back in line. The waiting SsbChannelListener should pick it up.
string sql = String.Format(@"
retry:
save transaction swiper_no_swiping
declare @cg uniqueidentifier
declare @rc int
waitfor (get conversation group @cg from [{0}]), TIMEOUT @timeout
if @cg is null
begin
return --timeout
end
exec @rc = sp_getapplock @Resource=@cg, @LockMode='Exclusive', @LockTimeout = 0
if @rc = -1
begin
print 'skipping message for locked conversation_group'
rollback transaction swiper_no_swiping
goto retry
end
set @conversation_group_id = @cg
", this.serviceInfo.QueueName);
SqlCommand cmd = new SqlCommand(sql, cn);
cmd.CommandTimeout = 0;
cn.InfoMessage += new SqlInfoMessageEventHandler(cn_InfoMessage);
SqlParameter pTimeout = cmd.Parameters.Add("@timeout", SqlDbType.Int);
pTimeout.Value = TimeoutHelper.ToMilliseconds(timeout);
SqlParameter pConversationGroupId = cmd.Parameters.Add("@conversation_group_id", SqlDbType.UniqueIdentifier);
pConversationGroupId.Direction = ParameterDirection.Output;
//Run the command, but abort if the another thread runs Close or Abort
IAsyncResult result = cmd.BeginExecuteNonQuery();
int rc = WaitHandle.WaitAny(new WaitHandle[] { result.AsyncWaitHandle, cancelEvent });
if (rc == 1) //cancel event
{
cmd.Cancel();
TraceHelper.TraceEvent(System.Diagnostics.TraceEventType.Verbose, "Canceling Service Broker wait on SsbChannelListener shutdown", "AcceptConversationGroup");
cn.Close();
return(null);
}
if (rc != 0)
{
throw new InvalidOperationException("Unexpected state");
}
cmd.EndExecuteNonQuery(result);
if (pConversationGroupId.Value == null || pConversationGroupId.Value.GetType() != typeof(Guid))
{
throw new TimeoutException(String.Format("Timed out while waiting for Conversation Group"));
}
Guid conversationGroupId = (Guid)pConversationGroupId.Value;
TraceHelper.TraceEvent(System.Diagnostics.TraceEventType.Verbose, string.Format("Accepted conversation group {0}", conversationGroupId), "AcceptConversationGroup");
SsbConversationGroupReceiver cg = new SsbConversationGroupReceiver(cn, tx, conversationGroupId, this.serviceInfo, this);
return(cg);
}
catch (SqlException ex)
{
if (!helper.IsTimeRemaining)
{
throw new TimeoutException(String.Format("Timed out while waiting for Conversation Group. Timeout value was {0} seconds", timeout.TotalSeconds), ex);
}
else
{
throw new ProtocolException("An error occurred while waiting for a Conversation Group", ex);
}
}
}
internal SsbConversationGroupReceiver AcceptConversationGroup(Guid conversationGroupId, TimeSpan timeout)
{
TimeoutHelper helper = new TimeoutHelper(timeout);
TransactionOptions to = new TransactionOptions();
to.IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted;
to.Timeout = TimeSpan.MaxValue;
CommittableTransaction tx = new CommittableTransaction(to);
Transaction currentTrans = Transaction.Current;
Transaction.Current = tx;
SqlConnection cn = SsbHelper.GetConnection(this.connstring);
cn.Open();
Transaction.Current = currentTrans;
//first lock the the Conversation Group. This will prevent other SsbConversationGroupReceivers
//from poaching the messages.
string sql = @"
declare @cg uniqueidentifier
declare @rc int
set @cg = @conversation_group_id
exec @rc = sp_getapplock @Resource=@cg, @LockMode='Exclusive'
if @rc not in (0,1)
begin
raiserror('Failed to lock conversation group. sp_getapplock failure code %d.',16,1,@rc);
end
";
SqlCommand cmd = new SqlCommand(sql, cn);
SqlParameter pConversationGroupId = cmd.Parameters.Add("@conversation_group_id", SqlDbType.UniqueIdentifier);
pConversationGroupId.Value = conversationGroupId;
cmd.CommandTimeout = helper.RemainingTimeInMillisecondsOrZero();
//Run the command, but abort if the another thread runs Close or Abort
IAsyncResult result = cmd.BeginExecuteNonQuery();
int rc = WaitHandle.WaitAny(new WaitHandle[] { result.AsyncWaitHandle, cancelEvent });
if (rc == 1) //cancel event
{
cmd.Cancel();
TraceHelper.TraceEvent(System.Diagnostics.TraceEventType.Verbose, "Canceling Service Broker wait on SsbChannelListener shutdown", "AcceptConversationGroup");
cn.Close();
return(null);
}
if (rc != 0)
{
throw new InvalidOperationException("Unexpected state");
}
cmd.EndExecuteNonQuery(result);
SsbConversationGroupReceiver cg = new SsbConversationGroupReceiver(cn, tx, conversationGroupId, this.serviceInfo, this);
cg.Open();
//now wait for a message on the conversation. Do it here because WCF expects the wait to be here instead of in a subsequent receive.
//And also there is a different timeout to accepting a channel and waiting for additional messages.
//But we need to pass in the cancelEvent to abort the listen, if this ChannelListener is closed or aborted
if (!cg.WaitForFirstMessage(helper.RemainingTime(), cancelEvent))
{
if (this.State != CommunicationState.Opened)//this ChannelListener was closed or aborted, so this is expected.
{
//for some reason the transaction tx is in an uncommitable state here. Not sure why.
//however no other work has occured on this connection, so we can just shut it down.
cn.Close();
return(null);
}
throw new TimeoutException(String.Format("Timed out while waiting for Conversation Group"));
}
return(cg);
}
protected override void OnOpen(TimeSpan timeout)
{
this.serviceInfo = SsbHelper.GetServiceInfo(this.listenUri.Service, timeout, this.connstring);
}
public void SetConversationTimer(Guid conversationHandle, TimeSpan timerTimeout)
{
SsbHelper.SetConversationTimer(conversationHandle, timerTimeout, this.con);
}
public void OpenConversation(Guid conversationHandle, TimeSpan timeout)
{
ThrowIfDisposedOrNotOpen();
this.conversation = SsbHelper.GetConversationInfo(conversationHandle, con);
}