/// <summary>
/// 固态的缓存容器，提供了相关的基本操作
/// </summary>
/// <param name="capacity">最大容量</param>
/// <exception cref="ArgumentException">错误的参数取值范围</exception>
public FixedCacheContainer(int capacity)
{
if (capacity <= 0)
{
throw new ArgumentException("Illegal capacity!");
}
_remainingCount = _capacity = capacity;
_caches = new Stack <ICacheStub <T> >();
//initialize.
for (int i = 0; i < _capacity; i++)
{
ICacheStub <T> stub = new CacheStub <T> {
Fixed = true
};
((CacheStub <T>)stub).Id = i;
stub.Cache = new CacheItem <T>();
stub.Cache.SetValue(new T());
_caches.Push(stub);
}
}
/// <summary>
/// 添加一个新的缓存
/// </summary>
/// <param name="key">缓存Key</param>
/// <param name="obj">要缓存对的象</param>
/// <param name="expireTime">过期时间</param>
/// <returns>返回缓存对象</returns>
/// <exception cref="LeaseDeadException">当前缓存已经处于死亡状态</exception>
public IReadonlyCacheStub <V> Add(K key, V obj, DateTime expireTime)
{
if (IsDead)
{
throw new LeaseDeadException("Cannot execute add operation on a dead container.");
}
ICacheStub <V> stub = new CacheStub <V>(expireTime)
{
Cache = new CacheItem <V>()
};
stub.Cache.SetValue(obj);
lock (_lockObj)
{
ICacheStub <V> tmpStub;
if (!_caches.TryGetValue(key, out tmpStub))
{
_caches.Add(key, stub);
}
return((IReadonlyCacheStub <V>)stub);
}
}
