> + // If a future to delete a blob/directory actually got created
> above,
> + // keep a reference of that in the outstandingFutures list. This is
> + // useful in case of a timeout exception. All outstanding futures
> can
> + // then be cancelled.
> + if (blobDelFuture != null) {
> + final AtomicReference<ListenableFuture<Void>>
> atomicBlobDelFuture =
> + new AtomicReference<ListenableFuture<Void>>(blobDelFuture);
> + outstandingFutures.add(atomicBlobDelFuture);
> +
> + // Add a callback to release the semaphore. This is required for
> + // other threads waiting to acquire a semaphore above to make
> + // progress.
> + Futures.addCallback(blobDelFuture, new FutureCallback<Object>() {
> + @Override
> + public void onSuccess(final Object o) {
> + outstandingFutures.remove(atomicBlobDelFuture);
Can you make outstandingFutures a HashSet to avoid O(n) lookup?
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