/// <summary>Creates a new outgoing response frame with an OK reply status and a return value.</summary>
/// <param name="current">The Current object for the corresponding incoming request.</param>
/// <param name="format">The format type used to marshal classes and exceptions, when this parameter is null
/// the communicator's default format is used.</param>
/// <param name="value">The return value to marshal.</param>
/// <param name="writer">A delegate that must write the value to the frame.</param>
/// <returns>A new OutgoingResponseFrame.</returns>
public static OutgoingResponseFrame WithReturnValue <T>(Current current,
FormatType?format,
T value,
OutputStreamWriter <T> writer)
{
var response = new OutgoingResponseFrame(current.Encoding);
byte[] buffer = new byte[256];
buffer[0] = (byte)ReplyStatus.OK;
response.Data.Add(buffer);
var ostr = new OutputStream(Ice1Definitions.Encoding, response.Data, new OutputStream.Position(0, 1),
response.Encoding, format ?? current.Adapter.Communicator.DefaultFormat);
writer(ostr, value);
ostr.Save();
response.Finish();
return(response);
}
private async Task <OutgoingResponseFrame> DispatchAsync(
OutgoingRequestFrame outgoingRequest,
int requestId,
CancellationToken cancel)
{
// Increase the direct count to prevent the object adapter from being destroyed while the dispatch is in
// progress. This will also throw if the object adapter has been deactivated.
_adapter.IncDirectCount();
IDispatchObserver?dispatchObserver = null;
try
{
var incomingRequest = new IncomingRequestFrame(outgoingRequest, _adapter.IncomingFrameSizeMax);
var current = new Current(_adapter, incomingRequest, oneway: requestId == 0, cancel);
// Then notify and set dispatch observer, if any.
ICommunicatorObserver?communicatorObserver = _adapter.Communicator.Observer;
if (communicatorObserver != null)
{
dispatchObserver = communicatorObserver.GetDispatchObserver(current,
requestId,
incomingRequest.Size);
dispatchObserver?.Attach();
}
OutgoingResponseFrame?outgoingResponseFrame = null;
try
{
IObject?servant = current.Adapter.Find(current.Identity, current.Facet);
if (servant == null)
{
throw new ObjectNotExistException(current.Identity, current.Facet, current.Operation);
}
ValueTask <OutgoingResponseFrame> vt = servant.DispatchAsync(incomingRequest, current);
if (requestId != 0)
{
// We don't use the cancelable WaitAsync for the await here. The asynchronous dispatch is
// not completed yet and we want to make sure the observer is detached only when the dispatch
// completes, not when the caller cancels the request.
outgoingResponseFrame = await vt.ConfigureAwait(false);
outgoingResponseFrame.Finish();
dispatchObserver?.Reply(outgoingResponseFrame.Size);
}
}
catch (Exception ex)
{
RemoteException actualEx;
if (ex is RemoteException remoteEx && !remoteEx.ConvertToUnhandled)
{
actualEx = remoteEx;
}
else
{
actualEx = new UnhandledException(current.Identity, current.Facet, current.Operation, ex);
}
Incoming.ReportException(actualEx, dispatchObserver, current);
if (requestId != 0)
{
outgoingResponseFrame = new OutgoingResponseFrame(incomingRequest, actualEx);
outgoingResponseFrame.Finish();
dispatchObserver?.Reply(outgoingResponseFrame.Size);
}
}
