protected override async Task OnReconnected(IRequest request, String connectionId)
{
Log("Entered");
if (_asyncLocalScopeOperation.Value != null)
{
throw new InvalidOperationException("Expected empty operation scope.");
}
IServiceScope opScope = _asyncLocalScopeRequest.Value?.Scope.ServiceProvider.CreateScope() ?? this.rootServiceProvider.CreateScope();
using (ScopeWrapper sw = new ScopeWrapper(opScope))
{
_asyncLocalScopeOperation.Value = sw;
Log("Created operation scope: " + sw.Id);
try
{
await base.OnReconnected(request, connectionId).ConfigureAwait(false);
}
finally
{
if (_asyncLocalScopeOperation.Value != sw)
{
throw new InvalidOperationException("Operation Scope has changed unexpectedly.");
}
_asyncLocalScopeOperation.Value = null;
}
Log("Disposing operation scope: " + sw.Id);
}
Log("Leaving");
}
private static void Log(String message, [CallerMemberName] String callerName = null)
{
ScopeWrapper requestScope = _asyncLocalScopeRequest.Value;
ScopeWrapper opScope = _asyncLocalScopeOperation.Value;
String requestScopeStr = requestScope == null ? "null" : "set " + requestScope.Id;
String operationScopeStr = opScope == null ? "null" : "set " + opScope.Id;
String format = String.Format(CultureInfo.InvariantCulture, "{0} - {1} - Request scope: {2}. Operation scope: {3}.", callerName, message, requestScopeStr, operationScopeStr);
Debug.WriteLine(format);
}
// Originally I thought `ProcessRequest` was invoked for every operation/request and its lifespan was that of the request (while it executes OnConnected, OnReceived, OnDisconnected, and OnReconnected) - but it turns out I was wrong.
// It depends on the Transport - e.g. longPolling will run `OnReceived` inside `ProcessRequest`, but with WebSockets `OnReceived` is not (but `OnConnected` is).
public override async Task ProcessRequest(HostContext context)
{
Log("Entered");
if (_asyncLocalScopeRequest.Value != null)
{
throw new InvalidOperationException("Expected empty request scope.");
}
if (_asyncLocalScopeOperation.Value != null)
{
throw new InvalidOperationException("Expected empty operation scope.");
}
using (ScopeWrapper sw = new ScopeWrapper(this.rootServiceProvider.CreateScope()))
{
_asyncLocalScopeRequest.Value = sw;
Log("Created request scope: " + sw.Id);
try
{
await base.ProcessRequest(context).ConfigureAwait(false);
}
finally
{
if (_asyncLocalScopeRequest.Value != sw)
{
throw new InvalidOperationException("Request Scope has changed unexpectedly.");
}
_asyncLocalScopeRequest.Value = null;
}
Log("Disposing request scope: " + sw.Id);
}
Log("Leaving");
}