private SessionStateStoreData GetItem(bool isExclusive, HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actions)
{
locked = false;
lockAge = TimeSpan.Zero;
lockId = null;
actions = SessionStateActions.None;
SessionStateStoreData result = null;
var key = GetSessionIdKey(id);
using (var client = GetClient())
using (var distributedLock = GetDistributedLock(client, key))
{
if (distributedLock.LockState == DistributedLock.LOCK_NOT_ACQUIRED)
{
options.OnDistributedLockNotAcquired(id);
return(null);
}
var stateRaw = client.GetAllEntriesFromHashRaw(key);
RedisSessionState state;
if (!RedisSessionState.TryParse(stateRaw, out state))
{
return(null);
}
actions = state.Flags;
if (state.Locked)
{
locked = true;
lockId = state.LockId;
lockAge = DateTime.UtcNow - state.LockDate;
return(null);
}
if (isExclusive)
{
locked = state.Locked = true;
state.LockDate = DateTime.UtcNow;
lockAge = TimeSpan.Zero;
lockId = ++state.LockId;
}
state.Flags = SessionStateActions.None;
UseTransaction(client, transaction =>
{
transaction.QueueCommand(c => c.SetRangeInHashRaw(key, state.ToMap()));
transaction.QueueCommand(c => c.ExpireEntryIn(key, TimeSpan.FromMinutes(state.Timeout)));
});
var items = actions == SessionStateActions.InitializeItem ? new SessionStateItemCollection() : state.Items;
result = new SessionStateStoreData(items, staticObjectsGetter(context), state.Timeout);
}
return(result);
}
public override void RemoveItem(HttpContext context, string id, object lockId, SessionStateStoreData item)
{
var key = GetSessionIdKey(id);
using (var client = GetClient())
using (var distributedLock = GetDistributedLock(client, key))
{
if (distributedLock.LockState == DistributedLock.LOCK_NOT_ACQUIRED)
{
options.OnDistributedLockNotAcquired(id);
return;
}
var stateRaw = client.GetAllEntriesFromHashRaw(key);
UseTransaction(client, transaction =>
{
RedisSessionState state;
if (RedisSessionState.TryParse(stateRaw, out state) && state.Locked && state.LockId == (int)lockId)
{
transaction.QueueCommand(c => c.Remove(key));
}
});
}
}
private void UpdateSessionStateIfLocked(IRedisClient client, string id, int lockId, Action <RedisSessionState> stateAction)
{
var key = GetSessionIdKey(id);
using (var distributedLock = GetDistributedLock(client, key))
{
if (distributedLock.LockState == DistributedLock.LOCK_NOT_ACQUIRED)
{
options.OnDistributedLockNotAcquired(id);
return;
}
var stateRaw = client.GetAllEntriesFromHashRaw(key);
RedisSessionState state;
if (RedisSessionState.TryParse(stateRaw, out state) && state.Locked && state.LockId == lockId)
{
stateAction(state);
UpdateSessionState(client, key, state);
}
}
}