IoFuture<Connection> connect(FutureResult<Connection> orig) {
AtomicReference<FutureResult<Connection>> futureConnectionRef = this.futureConnectionRef;
FutureResult<Connection> oldVal;
oldVal = futureConnectionRef.get();
if (oldVal != orig) {
return oldVal.getIoFuture();
}
final FutureResult<Connection> futureResult = new FutureResult<>();
while (!futureConnectionRef.compareAndSet(oldVal, futureResult)) {
oldVal = futureConnectionRef.get();
if (oldVal != orig) {
// discard our new one
return oldVal.getIoFuture();
}
}
IoFuture<Connection> realFuture;
try {
realFuture = endpoint.connect(uri);
} catch (IOException e) {
realFuture = new FailedIoFuture<>(e);
}
splice(futureResult, realFuture);
final IoFuture<Connection> ioFuture = futureResult.getIoFuture();
ioFuture.addNotifier(HANDLER, this);
return ioFuture;
}
void splice(FutureResult<Connection> futureResult, IoFuture<Connection> realFuture) {
// always add in this order
futureResult.addCancelHandler(realFuture);
realFuture.addNotifier(IoUtils.resultNotifier(), futureResult);
}