AsyncSubject <byte[]> WriteBlobToDisk(string key, byte[] byteData, bool synchronous)
{
var ret = new AsyncSubject <byte[]>();
var scheduler = synchronous ? System.Reactive.Concurrency.Scheduler.Immediate : Scheduler;
var path = GetPathForKey(key);
// NB: The fact that our writing AsyncSubject waits until the
// write actually completes means that an Insert immediately
// followed by a Get will take longer to process - however,
// this also means that failed writes will disappear from the
// cache, which is A Good Thing.
Func <IObservable <byte[]> > writeResult = () => BeforeWriteToDiskFilter(byteData, scheduler)
.Select(x => new MemoryStream(x))
.Zip(Observable.Defer(() =>
filesystem.OpenFileForWriteAsync(path, scheduler))
.Retry(1),
(from, to) => new { from, to })
.SelectMany(x => x.from.CopyToAsync(x.to, scheduler))
.Select(_ => byteData)
.Do(_ =>
{
if (!synchronous && key != BlobCacheIndexKey)
{
actionTaken.OnNext(Unit.Default);
}
}, ex => LogHost.Default.WarnException("Failed to write out file: " + path, ex));
writeResult().Multicast(ret).Connect();
return(ret);
}
