protected internal override bool AddCore(string region, string key, StoredValue value)
{
EnsureDbCreated();
try
{
this._locker.EnterWriteLock();
object checkerMemoto = null;
if (value.Checker != null)
{
//真实存储在数据库中的值，是Checker的Memoto
checkerMemoto = value.Checker.GetMemoto();
}
this.Db_Add(region, key, value.Value, checkerMemoto);
return true;
}
catch
{
return false;
}
finally
{
this._locker.ExitWriteLock();
}
}
protected internal override bool AddCore(string region, string key, StoredValue value)
{
//由于优先使用内存中的缓存，所以添加到硬盘缓存的操作可以异步执行。
AsyncHelper.InvokeSafe(() =>
{
this._disk.AddCore(region, key, value);
});
return this._memory.AddCore(region, key, value);
}
protected internal override StoredValue GetCacheItemCore(string region, string key)
{
EnsureDbCreated();
try
{
this._locker.EnterReadLock();
object value = null;
object memoto = null;
this.Db_Read(key, region, out value, out memoto);
if (value != null)
{
var result = new StoredValue();
result.Value = value;
if (memoto != null)
{
//把Memoto转换为原始的Checker
var checkerMemoto = memoto as CheckerMemoto;
result.Checker = checkerMemoto.Restore();
}
return result;
}
}
catch { }
finally
{
this._locker.ExitReadLock();
}
return null;
}
protected internal override bool AddCore(string region, string key, StoredValue value)
{
return this._regionCache.Add(key, value, new CacheItemPolicy(), region);
}
protected internal abstract bool AddCore(string region, string key, StoredValue value);
