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Vanquish the curse of transform async, but for List now #612

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merged 1 commit into from
Jun 25, 2022
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Vanquish the curse of transform async, but for List now #612

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13 changes: 11 additions & 2 deletions src/DynamicData/List/Internal/TransformAsync.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,12 +38,21 @@ public IObservable<IChangeSet<TDestination>> Run()
observer =>
{
var state = new ChangeAwareList<TransformedItemContainer>();
var asyncLock = new SemaphoreSlim(1, 1);

return _source.Select(
async changes =>
{
await Transform(state, changes).ConfigureAwait(false);
return state;
try
{
await asyncLock.WaitAsync().ConfigureAwait(false);
await Transform(state, changes).ConfigureAwait(false);
return state;
}
finally
{
asyncLock.Release();
}
}).Select(tasks => tasks.ToObservable()).SelectMany(items => items).Select(
transformed =>
{
Expand Down