/// <summary>
/// 检查字典的容量。
/// </summary>
/// <param name="cacheKey">缓存键。</param>
/// <param name="capacity">设定的容量值。</param>
/// <param name="maxGen">当前最大的代。</param>
/// <param name="onRemoved">移除的通知方法。</param>
public void CheckCapacity(string cacheKey, int capacity, int maxGen, Action <CacheItem> onRemoved)
{
short gen = 0;
while (Count > capacity && gen <= maxGen && gen < CacheOptimizer.MAX_GEN_LIMIT)
{
//查找出未创建值的，以及最小代或过期的，将它移除
var needRemoveds = LazyValues.Where(s => s.Key != cacheKey &&
(!s.Value.IsValueCreated || s.Value.Value.Gen == gen || s.Value.Value.HasExpired())).ToArray();
foreach (var item in needRemoveds)
{
if (!item.Value.IsValueCreated)
{
LazyValues.TryRemove(item.Key, out Lazy <CacheItem> entry);
}
else if (TryRemove(item.Key, out CacheItem entry))
{
onRemoved(entry);
}
}
gen++;
}
}
internal Guid GetLazyLookupKeyValue(string lookupPropertyName)
{
var key = GetLazyLookupKey(lookupPropertyName);
return(LazyValues.ContainsKey(key)
? (Guid)LazyValues[key]
: Guid.Empty);
}
/// <summary>
/// 实例化 <see cref="SafetyDictionary{TKey, TValue}"/> 类的新实例。
/// </summary>
/// <param name="collection"></param>
public SafetyDictionary(IEnumerable <KeyValuePair <TKey, TValue> > collection)
: this()
{
if (collection != null)
{
foreach (var kvp in collection)
{
LazyValues.TryAdd(kvp.Key, new Lazy <TValue>(() => kvp.Value, _mode));
}
}
}
internal void SetLazyLookupKeyValue(string lookupPropertyName, Guid value)
{
if (value == Guid.Empty)
{
return;
}
var key = GetLazyLookupKey(lookupPropertyName);
if (LazyValues.ContainsKey(key))
{
LazyValues[key] = value;
}
else
{
LazyValues.Add(key, value);
}
}
/// <summary>
/// 尝试通过 key 获取值，如果 key 不存在则通过函数生成新值并添加到字典中。
/// </summary>
/// <param name="key"></param>
/// <param name="valueFactory">新值的函数。</param>
/// <returns></returns>
public TValue GetOrAdd(TKey key, Func <TValue> valueFactory)
{
var lazy = LazyValues.GetOrAdd(key, k => new Lazy <TValue>(valueFactory, _mode));
return(lazy != null && lazy.Value != null ? lazy.Value : default);
