public static async Task <T> GetOrAdd <T>(this ICacheItem <T> self, ICacheItemLock lockObj, Func <Task <T> > getProc, bool continueOnCapturedContext = false)
{
var cacheValue = await self.Get().ConfigureAwait(continueOnCapturedContext);
if (cacheValue.HasValue)
{
return(cacheValue.Value);
}
await lockObj.Acquire().ConfigureAwait(continueOnCapturedContext);;
try
{
cacheValue = await self.Get().ConfigureAwait(continueOnCapturedContext);
if (cacheValue.HasValue)
{
return(cacheValue.Value);
}
var value = await getProc().ConfigureAwait(continueOnCapturedContext);
await self.Set(value).ConfigureAwait(continueOnCapturedContext);
return(value);
}
finally
{
await lockObj.Release().ConfigureAwait(continueOnCapturedContext);
}
}
public static object ShowPropertyData(
[ExcelArgument(Name = "ObjectHandle", Description = "Handle to an object.")] string h,
[ExcelArgument(Name = "[Property]", Description = "Name of the property being retrieved.")] object p)
{
object res = ExcelError.ExcelErrorNA;
if (_cache.ContainsKey(h))
{
ICacheItem handle = _cache.Lookup(h) as CacheItem;
if (!(p is ExcelMissing))
{
res = handle.Get(p.ToString());
}
else
{
res = handle.Get();
}
if (handle.Exception != null)
{
res = handle.Exception.Message;
}
}
return(res);
}
