/// <summary>
/// 在请求开始时:SessionStateModule 对象调用GetItemExclusive方法,在这个期间有一个AcquireRequestState事件,
/// 当EnableSessionState 属性设置为true时,也是默认情形,
/// 如果EnableSessionState属性设置为ReadOnly,SessionStateModule对象调用的方法就改为GetItem方法
/// </summary>
/// <param name="context"></param>
/// <param name="id"></param>
/// <param name="locked"></param>
/// <param name="lockAge"></param>
/// <param name="lockId"></param>
/// <param name="actions"></param>
/// <returns></returns>
public override SessionStateStoreData GetItemExclusive(HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out System.Web.SessionState.SessionStateActions actions)
{
return(this.GetSessionStoreItem(true, context, id, out locked, out lockAge, out lockId, out actions));
}
/// <summary>
///
/// </summary>
/// <param name="lockRecord"></param>
/// <param name="context"></param>
/// <param name="id"></param>
/// <param name="locked"></param>
/// <param name="lockAge"></param>
/// <param name="lockId"></param>
/// <param name="actionFlags"></param>
/// <returns></returns>
public SessionStateStoreData GetSessionStoreItem(bool lockRecord, HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out System.Web.SessionState.SessionStateActions actionFlags)
{
//init out
SessionStateStoreData item = null;
lockAge = TimeSpan.Zero;
lockId = null;
locked = false;
actionFlags = 0;
//要存储的内容
string serializedItems = "";
int timeout = 0;
bool found = false;
bool deleted = false;
var model = this.cache.Get <SessionStateList>(id);
if (lockRecord)
{
if (model == null || model.SessionModels == null || model.SessionModels.Count() == 0)
{
locked = true;
}
else
{
var lockedList = from n in model.SessionModels
where !n.IsLocked && n.LockDate > DateTime.Now
select n;
if (lockedList.Count() == 0)
{
locked = true;
}
else
{
locked = false;
}
foreach (var n in model.SessionModels)
{
if (!n.IsLocked && n.LockDate > DateTime.Now)
{
n.IsLocked = true;
n.LockDate = DateTime.Now;
}
}
}
}
if (model != null && model.SessionModels != null && model.SessionModels.Count() > 0)
{
//删除数据
var first = model.SessionModels.OrderByDescending(o => o.LockDate).FirstOrDefault();
if (first != null)
{
if (first.ExpireDate < DateTime.Now)
{
locked = false;
deleted = true;
}
else
{
found = true;
}
serializedItems = first.SessionText;
lockAge = DateTime.Now.Subtract(first.LockDate);
lockId = first.LockId;
actionFlags = (System.Web.SessionState.SessionStateActions)first.ActionFlag;
timeout = first.Timeout;
}
}
if (!found)
{
locked = false;
}
if (deleted)
{
model.SessionModels = new SessionState[0];
}
if (found && !locked)
{
lockId = (long)lockId + 1;
foreach (var session in model.SessionModels)
{
session.LockId = (long)lockId;
session.ActionFlag = SessionStateActions.None;
}
if ((model.ExpireDate - DateTime.Now).Minutes <= 0)
{
model.ExpireDate = DateTime.Now.AddMinutes(sessionCfg.Timeout.TotalMinutes);
}
this.cache.Set(id, model, model.ExpireDate - DateTime.Now);
}
//以分钟为单位
if (actionFlags == (System.Web.SessionState.SessionStateActions)SessionStateActions.InitializeItem)
{
item = this.CreateNewStoreData(context, (int)sessionCfg.Timeout.TotalMinutes);
}
else
{
item = new System.Func <SessionStateStoreData>(() =>
{
using (var ms = new MemoryStream(Convert.FromBase64String(serializedItems)))
{
var sessionItems = new SessionStateItemCollection();
if (ms.Length > 0)
{
BinaryReader reader = new BinaryReader(ms);
sessionItems = SessionStateItemCollection.Deserialize(reader);
}
return(new SessionStateStoreData(sessionItems, SessionStateUtility.GetSessionStaticObjects(context), timeout <= 0 ? (int)sessionCfg.Timeout.TotalMinutes : timeout));
}
}).Invoke();
}
return(item);
}
public System.Web.SessionState.SessionStateStoreData GetItem(bool lockRecord, System.Web.HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out System.Web.SessionState.SessionStateActions actions)
{
return(GetSessionStoreItem(lockRecord, context, id, out locked, out lockAge, out lockId, out actions));
}
