LiveElement CreateChildElement(SourceFragment sourceFragment)
{
var elm = new LiveElement(parent: this);
elm.UpdateFrom(sourceFragment.ToXml());
return(elm);
}
public static LiveDocument Open(
AbsoluteFilePath path,
IFileSystem fs,
IObservable <ILookup <ObjectIdentifier, ObjectIdentifier> > metadata,
BehaviorSubject <Dictionary <ObjectIdentifier, IElement> > idToElement,
IObserver <IBinaryMessage> mutations,
IScheduler scheduler)
{
IDocument <byte[]> fileOnDisk = new FileWatchingDocument(fs, path);
var parsingErrors = new BehaviorSubject <Optional <Exception> >(Optional.None());
var invalidated = new Subject <Unit>();
var root = new LiveElement(
file: path,
metadata: metadata,
isReadOnly: fileOnDisk.ErrorsDuringLoading.Or(parsingErrors)
.Select(e => e.HasValue)
.DistinctUntilChanged()
.Replay(1).RefCount(),
invalidated: invalidated,
mutations: mutations,
getElement: id =>
idToElement.Value.TryGetValue(id).Or(Element.Empty));
Optional <XElement> xElementForSaving = Optional.None <XElement>();
var allElements = root.Subtree().Replay(1);
var source = new ReplaySubject <SourceFragment>(1);
return(new LiveDocument
{
_garbage = Disposable.Combine(
// Save on internal changes
invalidated
.Select(_ =>
{
if (xElementForSaving.HasValue)
{
var sourceFragment = SourceFragment.FromXml(xElementForSaving.Value);
source.OnNext(sourceFragment);
return Optional.Some(sourceFragment);
}
return Optional.None();
})
.NotNone()
.Throttle(TimeSpan.FromSeconds(0.5), scheduler)
.Select(sourceFragment =>
Observable.FromAsync(async() =>
await fileOnDisk.Save(sourceFragment.ToBytes())))
.Concat()
.Subscribe(),
// Load on external changes
fileOnDisk.ExternalChanges
.ObserveOn(Application.MainThread)
.Subscribe(reload =>
{
var sourceFragment = SourceFragment.FromBytes(reload);
source.OnNext(sourceFragment);
try
{
var simulatorWasFaulted = parsingErrors.Value.HasValue;
var newDocument = sourceFragment.ToXml();
parsingErrors.OnNext(Optional.None());
xElementForSaving = Optional.None();
Console.WriteLine("Reloading " + path + " from disk...");
root.UpdateFrom(newDocument); // no known reasons to throw
xElementForSaving = Optional.Some(newDocument);
// hack to clear errors from the simulator,
// since UpdateFrom() doesn't know that the simulator
// have failed and will try to emit incremental updates
if (simulatorWasFaulted)
{
mutations.OnNext(new ReifyRequired());
}
}
catch (Exception e)
{
parsingErrors.OnNext(e);
// hack to get errors from the simulator
mutations.OnNext(new ReifyRequired());
}
}),
// Share subscription to Eleements
allElements.Connect(),
// Dispose fileOnDisk when disposed
fileOnDisk),
FilePath = Observable.Return(path),
Errors = fileOnDisk.Errors.Or(parsingErrors),
SimulatorIdPrefix = path.NativePath,
Source = source,
Root = root,
Elements = allElements,
_root = root,
_path = path,
_idToElement = idToElement,
});
}
