public unsafe static extern int ReceiveMessage(
QueueHandle handle,
uint timeout,
ReadAction action,
MQPROPS properties,
NativeOverlapped *overlapped,
ReceiveCallback receiveCallback,
CursorHandle cursorHandle,
ITransaction transaction); //MSMQ internal transaction
public QueueAsyncRequest(Message message, HashSet <QueueAsyncRequest> outstanding, uint timeoutMS, QueueHandle handle, ReadAction action, CursorHandle cursor)
{
Contract.Requires(cursor != null);
this.action = action;
this.handle = handle;
this.timeoutMS = timeoutMS;
Message = message;
Props = message.Props.Allocate();
Tcs = new TaskCompletionSource <Message>();
Outstanding = outstanding;
this.cursor = cursor;
}
internal Task <Message> ReceiveAsync(Properties properties, ReadAction action, TimeSpan?timeout, CursorHandle cursor)
{
if (IsClosed)
{
throw new ObjectDisposedException(nameof(Queue));
}
uint timeoutMS = TimeoutInMs(timeout);
var msg = new Message();
msg.Props.SetForRead(properties);
var ar = new QueueAsyncRequest(msg, _outstanding, timeoutMS, _handle, action, cursor);
lock (_outstanding)
{
_outstanding.Add(ar); // hold a reference to prevent objects being collected
if (!_boundToThreadPool)
{
ThreadPool.BindHandle(_handle); // queue can now use IO completion port
_boundToThreadPool = true;
}
}
return(ar.ReceiveAsync());
}
internal unsafe Message Receive(Properties properties, ReadAction action, TimeSpan?timeout, QueueTransaction transaction, CursorHandle cursor)
{
if (IsClosed)
{
throw new ObjectDisposedException(nameof(Queue));
}
uint timeoutMS = TimeoutInMs(timeout);
var msg = new Message();
int res;
msg.Props.SetForRead(properties);
for (;;) // loop because we might need to adjust memory size
{
var props = msg.Props.Allocate();
try
{
IntPtr txnHandle;
if (transaction.TryGetHandle(out txnHandle))
{
res = Native.ReceiveMessage(_handle, timeoutMS, action, props, null, null, cursor, txnHandle);
}
else
{
res = Native.ReceiveMessage(_handle, timeoutMS, action, props, null, null, cursor, transaction.InternalTransaction);
}
}
finally
{
msg.Props.Free();
}
if ((ErrorCode)res == ErrorCode.IOTimeout)
{
return(null);
}
if (Native.NotEnoughMemory(res))
{
msg.Props.IncreaseBufferSize();
continue; // try again
}
if (Native.IsError(res))
{
throw new QueueException(res);
}
msg.Props.ResizeBody();
return(msg);
}
}
public static extern int CreateCursor(QueueHandle handle, out CursorHandle cursorHandle);
