/// <summary>
/// 构造函数，初始化具有Dependency的CacheItem
/// </summary>
/// <param name="tKey">初始化CacheItem的键值</param>
/// <param name="data">CacheItem的Value</param>
/// <param name="dependencyBase">与此CacheItem相关的Dependency，用以判断过期</param>
/// <param name="cacheQueue"> 本CacheItem所属的CacheQueue的引用</param>
public CacheItem(TKey tKey, TValue data, DependencyBase dependencyBase, CacheQueueBase cacheQueue)
: base(cacheQueue)
{
this.key = tKey;
this.tValue = data;
if (dependencyBase != null)
{
dependencyBase.CacheItem = this;
dependencyBase.CacheItemBinded();
}
this.Dependency = dependencyBase;
}
/// <summary>
/// 向CacheQueue中增加一个有关联Dependency的Cache项，如果相应的key已经存在，则抛出异常
/// </summary>
/// <param name="key">键</param>
/// <param name="data">值</param>
/// <param name="dependency">依赖：相对时间依赖、绝对时间依赖、文件依赖或混合依赖</param>
/// <returns>值</returns>
/// <remarks>
/// <code source="..\Framework\TestProjects\DeluxeWorks.Library.Test\Caching\PortableCacheQueueTest.cs" region="AddRemoveClearTest" lang="cs" title="增加、移除、获取CahceItem项" />
/// </remarks>
public TValue Add(TKey key, TValue data, DependencyBase dependency)
{
key = ConvertCacheKey(key);
return(this._rwLock.DoWriteFunc(() =>
{
//删除已经存在而且过期的Cache项
if (this._innerDictionary.ContainsKey(key) &&
((CacheItem <TKey, TValue>) this._innerDictionary[key]).Dependency != null &&
((CacheItem <TKey, TValue>) this._innerDictionary[key]).Dependency.HasChanged)
{
this.Remove(key);
}
CacheItem <TKey, TValue> item = new CacheItem <TKey, TValue>(key, data, dependency, this);
if (dependency != null)
{
dependency.UtcLastModified = DateTime.UtcNow;
dependency.UtcLastAccessTime = DateTime.UtcNow;
}
if (this._overrideExistsItem)
{
this._innerDictionary[key] = item;
}
else
{
this._innerDictionary.Add(key, item);
}
#if NetFramework
this.Counters.EntriesCounter.RawValue = this.innerDictionary.Count;
#endif
return data;
}));
}