/// <summary>
/// Add a lazy loading table to the dictionary if it is not already loaded
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="getFromExternalSource"></param>
/// <param name="overrideLifetime">The new lifetime for objects in this table only. This overrides <see cref="EntriesDefaultMaximumLifetime"/>. If this is <see langword="null"/>, this table's entries are set to never expire</param>
/// <returns>Whether the table was added to the cache database</returns>
public bool TryAddTable <TKey, TValue>(Func <TKey, TValue> getFromExternalSource, TimeSpan?overrideLifetime)
{
LazyDictionary <object, object> newTable;
if (overrideLifetime.HasValue)
{
newTable = new LazyDictionary <object, object>(key => getFromExternalSource((TKey)key), overrideLifetime.Value);
}
else
{
newTable = new LazyDictionary <object, object>(key => getFromExternalSource((TKey)key));
}
return(_cache.TryAdd(typeof(TValue), newTable));
}
/// <summary>
/// Add a lazy loading table to the dictionary if it is not already loaded
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="getFromExternalSource"></param>
/// <returns>Whether the table was added to the cache database</returns>
public bool TryAddTable <TKey, TValue>(Func <TKey, TValue> getFromExternalSource)
{
if (getFromExternalSource is null)
{
throw new ArgumentNullException(nameof(getFromExternalSource));
}
LazyDictionary <object, object> newTable;
if (EntriesHaveDefaultMaximumLifetime)
{
newTable = new LazyDictionary <object, object>(key => getFromExternalSource((TKey)key), EntriesDefaultMaximumLifetime.Value);
}
else
{
newTable = new LazyDictionary <object, object>(key => getFromExternalSource((TKey)key));
}
return(_cache.TryAdd(typeof(TValue), newTable));
}
private bool TryGetTable <T>(out LazyDictionary <object, object> table)
{
return(_cache.TryGetValue(typeof(T), out table));
}