/*public*/ void IStateClientManager.Set(String id, SessionStateItem item, bool inStorage)
{
string key = CreateSessionStateCacheKey(id);
bool doInsert = true;
CacheInternal cacheInternal = HttpRuntime.CacheInternal;
Debug.Assert(!item.locked, "!item.locked");
Debug.Assert(item.lockAge == TimeSpan.Zero, "item.lockAge == TimeSpan.Zero");
if (inStorage)
{
Debug.Assert(item.lockCookie != 0, "item.lockCookie != 0");
InProcSessionState stateCurrent = (InProcSessionState)cacheInternal.Get(key);
/* If the state isn't there, we probably took too long to run. */
if (stateCurrent == null)
{
return;
}
Debug.Trace("SessionStateClientSet", "state is inStorage; key = " + key);
stateCurrent.spinLock.AcquireWriterLock();
try {
/* Only set the state if we are the owner */
if (!stateCurrent.locked || stateCurrent.lockCookie != item.lockCookie)
{
Debug.Trace("SessionStateClientSet", "Leave because we're not the owner; key = " + key);
return;
}
/* We can change the state in place if the timeout hasn't changed */
if (stateCurrent.timeout == item.timeout)
{
stateCurrent.Copy(
item.dict,
item.staticObjects,
item.timeout,
item.isCookieless,
item.streamLength,
false,
DateTime.MinValue,
item.lockCookie);
doInsert = false;
Debug.Trace("SessionStateClientSet", "Changing state inplace; key = " + key);
}
else
{
/* prevent overwriting when we drop the lock */
stateCurrent.lockCookie = 0;
}
}
finally {
stateCurrent.spinLock.ReleaseWriterLock();
}
}
else
{
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_TOTAL);
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_ACTIVE);
TraceSessionStats();
}
if (doInsert)
{
Debug.Trace("SessionStateClientSet", "Inserting state into Cache; key = " + key);
InProcSessionState state = new InProcSessionState(
item.dict,
item.staticObjects,
item.timeout,
item.isCookieless,
item.streamLength,
false,
DateTime.MinValue,
1);
cacheInternal.UtcInsert(
key, state, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, state.timeout, 0),
CacheItemPriority.NotRemovable, s_callback);
}
}
public override void SetAndReleaseItemExclusive(HttpContext context,
String id,
SessionStateStoreData item,
object lockId,
bool newItem)
{
string key = CreateSessionStateCacheKey(id);
bool doInsert = true;
CacheInternal cacheInternal = HttpRuntime.CacheInternal;
int lockCookieForInsert = NewLockCookie;
ISessionStateItemCollection items = null;
HttpStaticObjectsCollection staticObjects = null;
Debug.Assert(item.Items != null, "item.Items != null");
Debug.Assert(item.StaticObjects != null, "item.StaticObjects != null");
Debug.Assert(item.Timeout <= SessionStateModule.MAX_CACHE_BASED_TIMEOUT_MINUTES, "item.Timeout <= SessionStateModule.MAX_CACHE_BASED_TIMEOUT_MINUTES");
SessionIDManager.CheckIdLength(id, true /* throwOnFail */);
if (item.Items.Count > 0)
{
items = item.Items;
}
if (!item.StaticObjects.NeverAccessed)
{
staticObjects = item.StaticObjects;
}
if (!newItem)
{
Debug.Assert(lockId != null, "lockId != null");
InProcSessionState stateCurrent = (InProcSessionState)cacheInternal.Get(key);
int lockCookie = (int)lockId;
/* If the state isn't there, we probably took too long to run. */
if (stateCurrent == null)
{
return;
}
Debug.Trace("SessionStateClientSet", "state is inStorage; key = " + key);
Debug.Assert((stateCurrent._flags & (int)SessionStateItemFlags.Uninitialized) == 0, "Should never set an unitialized item; key = " + key);
stateCurrent._spinLock.AcquireWriterLock();
try {
/* Only set the state if we are the owner */
if (!stateCurrent._locked || stateCurrent._lockCookie != lockCookie)
{
Debug.Trace("SessionStateClientSet", "Leave because we're not the owner; key = " + key);
return;
}
/* We can change the state in place if the timeout hasn't changed */
if (stateCurrent._timeout == item.Timeout)
{
stateCurrent.Copy(
items,
staticObjects,
item.Timeout,
false,
DateTime.MinValue,
lockCookie,
stateCurrent._flags);
// Don't need to insert into the Cache because an in-place copy is good enough.
doInsert = false;
Debug.Trace("SessionStateClientSet", "Changing state inplace; key = " + key);
}
else
{
/* We are going to insert a new item to replace the current one in Cache
* because the expiry time has changed.
*
* Pleas note that an insert will cause the Session_End to be incorrectly raised.
*
* Please note that the item itself should not expire between now and
* where we do UtcInsert below because CacheInternal.Get above have just
* updated its expiry time.
*/
stateCurrent._flags |= (int)SessionStateItemFlags.IgnoreCacheItemRemoved;
/* By setting _lockCookie to 0, we prevent an overwriting by ReleaseExclusive
* when we drop the lock.
* The scenario can happen if another request is polling and trying to prempt
* the lock we have on the item.
*/
lockCookieForInsert = lockCookie;
stateCurrent._lockCookie = 0;
}
}
finally {
stateCurrent._spinLock.ReleaseWriterLock();
}
}
if (doInsert)
{
Debug.Trace("SessionStateClientSet", "Inserting state into Cache; key = " + key);
InProcSessionState state = new InProcSessionState(
items,
staticObjects,
item.Timeout,
false,
DateTime.MinValue,
lockCookieForInsert,
0);
try {
}
finally {
// protected from ThreadAbortEx
cacheInternal.UtcInsert(
key, state, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, state._timeout, 0),
CacheItemPriority.NotRemovable, _callback);
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_TOTAL);
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_ACTIVE);
TraceSessionStats();
}
}
}
public override void SetAndReleaseItemExclusive(HttpContext context, string id, SessionStateStoreData item, object lockId, bool newItem)
{
string key = this.CreateSessionStateCacheKey(id);
bool flag = true;
CacheInternal cacheInternal = HttpRuntime.CacheInternal;
int newLockCookie = NewLockCookie;
ISessionStateItemCollection sessionItems = null;
HttpStaticObjectsCollection staticObjects = null;
SessionIDManager.CheckIdLength(id, true);
if (item.Items.Count > 0)
{
sessionItems = item.Items;
}
if (!item.StaticObjects.NeverAccessed)
{
staticObjects = item.StaticObjects;
}
if (!newItem)
{
InProcSessionState state = (InProcSessionState)cacheInternal.Get(key);
int lockCookie = (int)lockId;
if (state == null)
{
return;
}
state._spinLock.AcquireWriterLock();
try
{
if (!state._locked || (state._lockCookie != lockCookie))
{
return;
}
if (state._timeout == item.Timeout)
{
state.Copy(sessionItems, staticObjects, item.Timeout, false, DateTime.MinValue, lockCookie, state._flags);
flag = false;
}
else
{
state._flags |= 2;
newLockCookie = lockCookie;
state._lockCookie = 0;
}
}
finally
{
state._spinLock.ReleaseWriterLock();
}
}
if (flag)
{
InProcSessionState state2 = new InProcSessionState(sessionItems, staticObjects, item.Timeout, false, DateTime.MinValue, newLockCookie, 0);
try
{
}
finally
{
cacheInternal.UtcInsert(key, state2, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, state2._timeout, 0), CacheItemPriority.NotRemovable, this._callback);
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_TOTAL);
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_ACTIVE);
}
}
}
