/*public*/ void IStateClientManager.Set(String id, SessionStateItem item, bool inStorage)
{
byte [] buf;
int length;
MemoryStream s;
try {
s = new MemoryStream(ITEM_SHORT_LENGTH);
Serialize(item, s);
buf = s.GetBuffer();
length = (int)s.Length;
s.Close();
}
catch {
if (inStorage)
{
((IStateClientManager)this).ReleaseExclusive(id, item.lockCookie);
}
throw;
}
#if SYNCHRONOUS
SetAsyncWorker(id, item, buf, length, inStorage);
#else
if (inStorage)
{
SetAsync(id, item, buf, length, inStorage);
}
else
{
SetAsyncWorker(id, item, buf, length, inStorage);
}
#endif
}
static protected void Serialize(SessionStateItem item, Stream stream)
{
bool hasDict;
bool hasStaticObjects;
BinaryWriter writer = new BinaryWriter(stream);
writer.Write(item.timeout);
writer.Write(item.isCookieless);
hasDict = item.dict != null;
writer.Write(hasDict);
hasStaticObjects = item.staticObjects != null;
writer.Write(hasStaticObjects);
if (hasDict)
{
item.dict.Serialize(writer);
}
if (hasStaticObjects)
{
item.staticObjects.Serialize(writer);
}
// Prevent truncation of the stream
writer.Write(unchecked ((byte)0xff));
}
// Called by IStateClientManager::Set
protected void SetAsync(String id, SessionStateItem item,
byte[] buf, int length, bool inStorage)
{
AsyncWorkItem asyncWorkItem = new AsyncWorkItem(this, id, item, buf, length, inStorage, 0);
WorkItem.PostInternal(new WorkItemCallback(asyncWorkItem.SetAsyncCallback));
}
internal AsyncWorkItem(StateClientManager manager, String id, SessionStateItem item,
byte[] buf, int length, bool inStorage, int lockCookie)
{
_manager = manager;
_id = id;
_item = item;
_buf = buf;
_length = length;
_inStorage = inStorage;
_lockCookie = lockCookie;
}
protected override void SetAsyncWorker(String id, SessionStateItem item,
byte[] buf, int length, bool inStorage)
{
UnsafeNativeMethods.SessionNDMakeRequestResults results;
Debug.Trace("SessionStateClientManager", "Calling Set, id=" + id + " dict=" + item.dict + " timeout=" + item.timeout);
MakeRequest(UnsafeNativeMethods.StateProtocolVerb.PUT, id,
UnsafeNativeMethods.StateProtocolExclusive.NONE, item.timeout, item.lockCookie,
buf, length, s_networkTimeout, out results);
}
static protected SessionStateItem Deserialize(
Stream stream,
int lockCookie)
{
SessionStateItem item;
int timeout;
bool isCookieless;
SessionDictionary dict;
bool hasDict;
bool hasStaticObjects;
HttpStaticObjectsCollection col;
Byte eof;
BinaryReader reader = new BinaryReader(stream);
timeout = reader.ReadInt32();
isCookieless = reader.ReadBoolean();
hasDict = reader.ReadBoolean();
hasStaticObjects = reader.ReadBoolean();
if (hasDict)
{
dict = SessionDictionary.Deserialize(reader);
}
else
{
dict = null;
}
if (hasStaticObjects)
{
col = HttpStaticObjectsCollection.Deserialize(reader);
}
else
{
col = null;
}
eof = reader.ReadByte();
Debug.Assert(eof == 0xff);
item = new SessionStateItem(
dict, col, timeout, isCookieless, (int)stream.Position,
false, TimeSpan.Zero, lockCookie);
return(item);
}
// Called by IStateClientManager::BeginGet
protected IAsyncResult BeginGetSync(String id, AsyncCallback cb, Object state)
{
SessionStateItem item = Get(id);
return(new HttpAsyncResult(cb, state, true, item, null));
}
// Callback func for the worker thread from SetAsync
protected virtual void SetAsyncWorker(String id, SessionStateItem item,
byte[] buf, int lenght, bool inStorage)
{
}
/*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);
}
}
protected override void SetAsyncWorker(String id, SessionStateItem item,
byte[] buf, int length, bool inStorage)
{
SqlCommand cmd;
Debug.Trace("SessionStateClientManager", "Calling Sql Set, id=" + id);
bool usePooling = true;
SqlStateConnection conn = GetConnection(ref usePooling);
try {
if (inStorage)
{
Debug.Assert(item.streamLength > 0, "item.streamLength > 0");
if (length <= ITEM_SHORT_LENGTH)
{
if (item.streamLength <= ITEM_SHORT_LENGTH)
{
cmd = conn._cmdTempUpdateShort;
}
else
{
cmd = conn._cmdTempUpdateShortNullLong;
}
}
else
{
if (item.streamLength <= ITEM_SHORT_LENGTH)
{
cmd = conn._cmdTempUpdateLongNullShort;
}
else
{
cmd = conn._cmdTempUpdateLong;
}
}
}
else
{
if (length <= ITEM_SHORT_LENGTH)
{
cmd = conn._cmdTempInsertShort;
}
else
{
cmd = conn._cmdTempInsertLong;
}
}
cmd.Parameters[0].Value = id + s_appSuffix;
cmd.Parameters[1].Size = length;
cmd.Parameters[1].Value = buf;
cmd.Parameters[2].Value = item.timeout;
if (inStorage)
{
cmd.Parameters[3].Value = item.lockCookie;
}
try {
cmd.ExecuteNonQuery();
}
catch (Exception e) {
SqlException sqlExpt = e as SqlException;
if (sqlExpt != null &&
sqlExpt.Number == SQL_ERROR_PRIMARY_KEY_VIOLATION &&
!inStorage)
{
Debug.Trace("SessionStateClientSet",
"Insert failed because of primary key violation; just leave gracefully; id=" + id);
// It's possible that two threads (from the same session) are creating the session
// state, both failed to get it first, and now both tried to insert it.
// One thread may lose with a Primary Key Violation error. If so, that thread will
// just lose and exit gracefully.
}
else
{
throw new HttpException(
HttpRuntime.FormatResourceString(SR.Cant_connect_sql_session_database),
e);
}
}
}
catch {
conn.Dispose();
throw;
}
ReuseConnection(ref conn, usePooling);
}
internal SessionStateItem DoGet(String id, UnsafeNativeMethods.StateProtocolExclusive exclusiveAccess)
{
SessionStateItem item = null;
MemoryStream stream;
int contentLength;
TimeSpan lockAge;
UnsafeNativeMethods.SessionNDMakeRequestResults results;
MakeRequest(UnsafeNativeMethods.StateProtocolVerb.GET,
id, exclusiveAccess, 0, 0,
null, 0, s_networkTimeout, out results);
switch (results.httpStatus)
{
case 200:
/* item found, deserialize it */
contentLength = results.contentLength;
if (contentLength > 0)
{
if (_bufGet == null || _bufGet.Length < contentLength)
{
_bufGet = new byte[contentLength];
}
UnsafeNativeMethods.SessionNDGetBody(new HandleRef(this, results.content), _bufGet, contentLength);
stream = new MemoryStream(_bufGet);
item = (SessionStateItem)Deserialize(stream, results.lockCookie);
stream.Close();
}
break;
case 423:
/* state locked, return lock information */
if (0 <= results.lockAge)
{
if (results.lockAge < Sec.ONE_YEAR)
{
lockAge = new TimeSpan(0, 0, results.lockAge);
}
else
{
lockAge = TimeSpan.Zero;
}
}
else
{
DateTime now = DateTime.Now;
if (0 < results.lockDate && results.lockDate < now.Ticks)
{
lockAge = now - new DateTime(results.lockDate);
}
else
{
lockAge = TimeSpan.Zero;
}
}
item = new SessionStateItem(
null, null, 0, false, 0, true, lockAge, results.lockCookie);
break;
}
return(item);
}
