public static T Cache <T, TKey>(this SimpleMRUCache cache, TKey key, Func <TKey, T> @select)
{
var cached = (T)cache[key];
if (!Equals(cached, default(T)))
{
return(cached);
}
cached = @select(key);
cache.Put(key, cached);
return(cached);
}
public ParameterMetadata GetSQLParameterMetadata(string query)
{
var metadata = (ParameterMetadata)sqlParamMetadataCache[query];
if (metadata == null)
{
// for native-sql queries, the param metadata is determined outside
// any relation to a query plan, because query plan creation and/or
// retrieval for a native-sql query depends on all of the return
// types having been set, which might not be the case up-front when
// param metadata would be most useful
metadata = BuildNativeSQLParameterMetadata(query);
sqlParamMetadataCache.Put(query, metadata);
}
return(metadata);
}