AcquireContextAsyncResult(InstanceHandle handle, Transaction hostTransaction, TimeSpan timeout, out bool setOperationPending, bool synchronous, AsyncCallback callback, object state)
: base(callback, state)
{
// Need to report back to the caller whether or not we set OperationPending.
setOperationPending = false;
this.handle = handle;
HostTransaction = hostTransaction;
this.timeoutHelper = new TimeoutHelper(timeout);
AcquireContextAsyncResult transactionWait;
bool reuseContext = false;
lock (this.handle.ThisLock)
{
if (!this.handle.IsValid)
{
throw Fx.Exception.AsError(new OperationCanceledException(SRCore.HandleFreed));
}
if (this.handle.OperationPending)
{
throw Fx.Exception.AsError(new InvalidOperationException(SRCore.CommandExecutionCannotOverlap));
}
setOperationPending = true;
this.handle.OperationPending = true;
transactionWait = this.handle.CurrentTransactionalAsyncResult;
if (transactionWait != null)
{
Fx.Assert(this.handle.AcquirePending == null, "Overlapped acquires pending.");
// If the transaction matches but is already completed (or completing), the easiest ting to do
// is wait for it to complete, then try to re-enlist, and have that failure be the failure mode for Execute.
// We do that by following the regular, non-matching transaction path.
if (transactionWait.HostTransaction.Equals(hostTransaction) && !this.handle.TooLateToEnlist)
{
reuseContext = true;
this.executionContext = transactionWait.ReuseContext();
this.handle.CurrentExecutionContext = this.executionContext;
}
else
{
this.handle.AcquirePending = this;
}
}
}
if (transactionWait != null)
{
Fx.Assert(transactionWait.IsCompleted, "Old AsyncResult must be completed by now.");
// Reuse the existing InstanceExecutionContext if this is the same transaction we're waiting for.
if (reuseContext)
{
Complete(true);
return;
}
TimeSpan waitTimeout = this.timeoutHelper.RemainingTime();
if (synchronous)
{
if (!transactionWait.WaitForHostTransaction.Wait(waitTimeout))
{
throw Fx.Exception.AsError(new TimeoutException(InternalSR.TimeoutOnOperation(waitTimeout)));
}
}
else
{
if (!transactionWait.WaitForHostTransaction.WaitAsync(AcquireContextAsyncResult.onHostTransaction, this, waitTimeout))
{
return;
}
}
}
if (DoAfterTransaction())
{
Complete(true);
}
}
protected override void Invoke()
{
_callback(_state,
this.TimedOut ? new TimeoutException(InternalSR.TimeoutOnOperation(_originalTimeout)) : null);
}
