private async Task <RedisValue> MemoLockWithoutSubscriptionAsync(MemoKey key, Func <CancellationToken, Task <RedisValue> > generator, CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
throw new TaskCanceledException();
}
var result = await TryGetCachedValue(key).ConfigureAwait(false);
if (result != null)
{
return(result.Value);
}
if (cancellationToken.IsCancellationRequested)
{
throw new TaskCanceledException();
}
try
{
return(await _lockService.LockAsync(key.GetLockKey(), async c =>
{
//in case we missed the publication
var result = await TryGetCachedValue(key).ConfigureAwait(false);
if (result != null)
{
return result.Value;
}
return await LockedCallback(key, generator, c).ConfigureAwait(false);
}, cancellationToken).ConfigureAwait(false));
}
catch (TaskCanceledException)
{
result = await TryGetCachedValue(key).ConfigureAwait(false);
if (result != null)
{
return(result.Value);
}
throw;
}
}
private async Task <RedisValue> LockedCallback(MemoKey key, Func <CancellationToken, Task <RedisValue> > generator, CancellationToken token)
{
if (token.IsCancellationRequested)
{
throw new TaskCanceledException();
}
try
{
var result = await generator(token).ConfigureAwait(false);
await _scriptLibrary.PublishAsync(new MemoSetValueParameters(key, result)).ConfigureAwait(false);
return(result);
}
catch (Exception e)
{
await _scriptLibrary.PublishAsync(new MemoSetValueParameters(key, e)).ConfigureAwait(false);
throw;
}
}