private string GetFromDistributedCache <T>(string key, Func <T> factory)
{
bool readSucceeded = true;
try
{
string cachedItem = string.Empty;
_readCircuitBreaker.ExecuteAction(() =>
{
cachedItem = _distributedCache.GetString(key);
});
if (cachedItem != null)
{
return(cachedItem);
}
}
catch (Exception ex)
{
readSucceeded = false;
}
var item = factory.Invoke();
var cacheItem = _converter.Serialize(new CacheWrapper <T>(item));
try
{
// if the read circuit is broken then writes will also be broken
if (readSucceeded && _readCircuitBreaker.IsClosed)
{
var cacheEntryOptions = new DistributedCacheEntryOptions {
AbsoluteExpirationRelativeToNow = TimeSpan.FromSeconds(DISTRIBUTED_TTL_SECONDS)
};
_writeCircuitBreaker.ExecuteAction(() =>
{
_distributedCache.SetString(key, cacheItem, cacheEntryOptions);
});
}
}
catch (Exception ex)
{
// log exception here
}
return(cacheItem);
}
private string GetSerializedCacheWrapper <T>(T cacheItem)
{
return(_converter.Serialize(new CacheWrapper <T>(cacheItem)));
}