/// <summary>
/// Asynchronously load data for the provided given key.
/// </summary>
/// <param name="key">Key to use for loading data</param>
/// <returns>
/// An object representing a pending operation
/// </returns>
public virtual IDataLoaderResult <T> LoadAsync(TKey key)
{
lock (_sync)
{
//once it enters the lock, it is guaranteed to exit the lock, as it does not depend on external code
if (_cachedList != null)
{
if (_cachedList.TryGetValue(key, out var ret2))
{
return(ret2);
}
}
if (_list != null)
{
if (_list.TryGetValue(key, out var ret2))
{
return(ret2);
}
if (_list.Count >= MaxBatchSize)
{
_list = new DataLoaderList(this);
}
}
else
{
_list = new DataLoaderList(this);
}
var ret = new DataLoaderPair <TKey, T>(_list, key);
_list.Add(key, ret);
_cachedList?.Add(key, ret);
return(ret);
}
}
/// <summary>
/// Asynchronously load data for the provided given key.
/// If the key is <see langword="null"/> then a <see cref="DataLoaderResult{T}"/> containing
/// <see langword="null"/> will be immediately returned.
/// </summary>
/// <param name="key">Key to use for loading data</param>
/// <returns>
/// An object representing a pending operation
/// </returns>
public virtual IDataLoaderResult <T> LoadAsync(TKey key)
{
// dictionaries do not support keys with null values (null reference values or null value types),
// so in this case bypass the data loader and return null
if (key == null)
{
return(DataLoaderResult <T> .DefaultValue);
}
lock (_sync)
{
//once it enters the lock, it is guaranteed to exit the lock, as it does not depend on external code
if (_cachedList != null)
{
if (_cachedList.TryGetValue(key, out var ret2))
{
return(ret2);
}
}
if (_list != null)
{
if (_list.TryGetValue(key, out var ret2))
{
return(ret2);
}
if (_list.Count >= MaxBatchSize)
{
_list = new DataLoaderList(this);
}
}
else
{
_list = new DataLoaderList(this);
}
var ret = new DataLoaderPair <TKey, T>(_list, key);
_list.Add(key, ret);
_cachedList?.Add(key, ret);
return(ret);
}
}
