private bool TryContinueHelper(IAsyncResult result, out AsyncResult.AsyncCompletion callback)
{
if (result != null)
{
callback = null;
if (this.checkSyncValidationFunc == null)
{
if (!result.CompletedSynchronously)
{
return(false);
}
}
else
{
if (!this.checkSyncValidationFunc(result))
{
return(false);
}
}
callback = this.GetNextCompletion();
if (callback == null)
{
AsyncResult.ThrowInvalidAsyncResult("Only call Check/SyncContinue once per async operation (once per PrepareAsyncCompletion).");
}
return(true);
}
else
{
throw new InvalidOperationException("InvalidNullAsyncResult"); //TODO: Fx.Exception.AsError(new InvalidOperationException(InternalSR.InvalidNullAsyncResult));
}
}
public void Prepared()
{
if (this.State != AsyncResult.TransactionSignalState.Ready)
{
AsyncResult.ThrowInvalidAsyncResult("PrepareAsyncCompletion should only be called once per PrepareTransactionalCall.");
}
this.State = AsyncResult.TransactionSignalState.Prepared;
}
private static void AsyncCompletionWrapperCallback(IAsyncResult result)
{
if (result != null)
{
if (!result.CompletedSynchronously)
{
AsyncResult asyncState = (AsyncResult)result.AsyncState;
if (asyncState.OnContinueAsyncCompletion(result))
{
AsyncResult.AsyncCompletion nextCompletion = asyncState.GetNextCompletion();
if (nextCompletion == null)
{
AsyncResult.ThrowInvalidAsyncResult(result);
}
bool flag = false;
Exception exception = null;
try
{
flag = nextCompletion(result);
}
catch (Exception exception2)
{
Exception exception1 = exception2;
//TODO:
/*if (!Fx.IsFatal(exception1))
* {
* flag = true;
* exception = exception1;
* }
* else
* {
* throw;
* }
*/
throw;
}
if (flag)
{
asyncState.Complete(false, exception);
}
return;
}
else
{
return;
}
}
else
{
return;
}
}
else
{
throw new InvalidOperationException("InvalidNullAsyncResult"); //TODO: Fx.Exception.AsError(new InvalidOperationException(InternalSR.InvalidNullAsyncResult));
}
}
void IDisposable.Dispose()
{
if (State == TransactionSignalState.Ready)
{
State = TransactionSignalState.Abandoned;
}
else if (State == TransactionSignalState.Prepared)
{
State = TransactionSignalState.Completed;
}
else
{
AsyncResult.ThrowInvalidAsyncResult("PrepareTransactionalCall should only be called in a using. Dispose called multiple times.");
}
try
{
TransactionHelper.CompleteTransactionScope(ref this.transactionScope);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
// Complete and Dispose are not expected to throw. If they do it can mess up the AsyncResult state machine.
throw Fx.Exception.AsError(new InvalidOperationException(SRCore.AsyncTransactionException));
}
// This will release the callback to run, or tell us that we need to defer the callback to Check/SyncContinue.
//
// It's possible to avoid this Interlocked when CompletedSynchronously is true, but we have no way of knowing that
// from here, and adding a way would add complexity to the AsyncResult transactional calling pattern. This
// unnecessary Interlocked only happens when: PrepareTransactionalCall is called with a non-null transaction,
// PrepareAsyncCompletion is reached, and the operation completes synchronously or with an exception.
IAsyncResult result;
if (State == TransactionSignalState.Completed && Unlock(out result))
{
if (this.parent.deferredTransactionalResult != null)
{
AsyncResult.ThrowInvalidAsyncResult(this.parent.deferredTransactionalResult);
}
this.parent.deferredTransactionalResult = result;
}
}
void IDisposable.Dispose()
{
IAsyncResult result;
if (this.State == AsyncResult.TransactionSignalState.Ready)
{
this.State = AsyncResult.TransactionSignalState.Abandoned;
}
else if (this.State == AsyncResult.TransactionSignalState.Prepared)
{
this.State = AsyncResult.TransactionSignalState.Completed;
}
else
{
AsyncResult.ThrowInvalidAsyncResult("PrepareTransactionalCall should only be called in a using. Dispose called multiple times.");
}
try
{
Fx.CompleteTransactionScope(ref this.transactionScope);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
throw Fx.Exception.AsError(new InvalidOperationException(SRCore.AsyncTransactionException));
}
if ((this.State == AsyncResult.TransactionSignalState.Completed) && base.Unlock(out result))
{
if (this.parent.deferredTransactionalResult != null)
{
AsyncResult.ThrowInvalidAsyncResult(this.parent.deferredTransactionalResult);
}
this.parent.deferredTransactionalResult = result;
}
}