/// <summary>
/// Constructor
/// </summary>
/// <param name="connection">MARS connection</param>
/// <param name="sessionId">MARS session ID</param>
/// <param name="callbackObject">Callback object</param>
/// <param name="async">true if connection is asynchronous</param>
public SNIMarsHandle(SNIMarsConnection connection, ushort sessionId, TdsParserStateObject callbackObject, out SNIError sniError)
{
_sessionId = sessionId;
_connection = connection;
_callbackObject = callbackObject;
sniError = SendControlPacket(SNISMUXFlags.SMUX_SYN, true);
}
protected override void CreateSessionHandle(TdsParserStateObject physicalConnection, bool async)
{
Debug.Assert(physicalConnection is TdsParserStateObjectManaged, "Expected a stateObject of type " + this.GetType());
TdsParserStateObjectManaged managedSNIObject = physicalConnection as TdsParserStateObjectManaged;
_sessionHandle = SNIProxy.Singleton.CreateMarsHandle(this, managedSNIObject.Handle, _outBuff.Length, async);
}
internal void Deactivate()
{
IntPtr ptr;
Bid.ScopeEnter(out ptr, "<sc.TdsParserSessionPool.Deactivate|ADV> %d# deactivating cachedCount=%d\n", this.ObjectID, this._cachedCount);
try
{
lock (this._cache)
{
for (int i = this._cache.Count - 1; i >= 0; i--)
{
TdsParserStateObject session = this._cache[i];
if ((session != null) && session.IsOrphaned)
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.Deactivate|ADV> %d# reclaiming session %d\n", this.ObjectID, session.ObjectID);
}
this.PutSession(session);
}
}
}
}
finally
{
Bid.ScopeLeave(ref ptr);
}
}
internal void PutSession(TdsParserStateObject session)
{
bool flag2 = session.Deactivate();
if (!this.IsDisposed)
{
if (flag2 && (this._cachedCount < 10))
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.PutSession|ADV> %d# keeping session %d cachedCount=%d\n", this.ObjectID, session.ObjectID, this._cachedCount);
}
this._freeStack.SynchronizedPush(session);
}
else
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.PutSession|ADV> %d# disposing session %d cachedCount=%d\n", this.ObjectID, session.ObjectID, this._cachedCount);
}
lock (this._cache)
{
this._cache.Remove(session);
this._cachedCount = this._cache.Count;
}
session.Dispose();
}
}
}
internal void Deactivate()
{
// When being deactivated, we check all the sessions in the
// cache to make sure they're cleaned up and then we dispose of
// sessions that are past what we want to keep around.
using (TryEventScope.Create("<sc.TdsParserSessionPool.Deactivate|ADV> {0} deactivating cachedCount={1}", ObjectID, _cachedCount))
{
lock (_cache)
{
// NOTE: The PutSession call below may choose to remove the
// session from the cache, which will throw off our
// enumerator. We avoid that by simply indexing backward
// through the array.
for (int i = _cache.Count - 1; i >= 0; i--)
{
TdsParserStateObject session = _cache[i];
if (null != session)
{
if (session.IsOrphaned)
{
// TODO: consider adding a performance counter for the number of sessions we reclaim
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.TdsParserSessionPool.Deactivate|ADV> {0} reclaiming session {1}", ObjectID, session.ObjectID);
PutSession(session);
}
}
}
// TODO: re-enable this assert when the connection isn't doomed.
//Debug.Assert (_cachedCount < MaxInactiveCount, "non-orphaned connection past initial allocation?");
}
}
}
internal SqlCachedBuffer(SqlMetaDataPriv metadata, TdsParser parser, TdsParserStateObject stateObj)
{
int len = 0;
this._cachedBytes = new ArrayList();
ulong num = parser.PlpBytesLeft(stateObj);
do
{
if (num == 0L)
{
return;
}
do
{
len = (num > 0x800L) ? 0x800 : ((int)num);
byte[] buff = new byte[len];
len = stateObj.ReadPlpBytes(ref buff, 0, len);
if (this._cachedBytes.Count == 0)
{
this.AddByteOrderMark(buff);
}
this._cachedBytes.Add(buff);
num -= len;
}while (num > 0L);
num = parser.PlpBytesLeft(stateObj);
}while (num > 0L);
}
protected override void CreateSessionHandle(TdsParserStateObject physicalConnection, bool async)
{
Debug.Assert(physicalConnection is TdsParserStateObjectManaged, "Expected a stateObject of type " + this.GetType());
TdsParserStateObjectManaged managedSNIObject = physicalConnection as TdsParserStateObjectManaged;
_sessionHandle = managedSNIObject.CreateMarsSession(this, async);
}
internal void PutSession(TdsParserStateObject session)
{
Debug.Assert(null != session, "null session?");
bool okToReuse;
_parser.Connection._parserLock.Wait(canReleaseFromAnyThread: false);
try
{
okToReuse = session.Deactivate();
}
finally
{
_parser.Connection._parserLock.Release();
}
bool disposeSession = false;
lock (_cache)
{
if (IsDisposed)
{
// We're diposed - just clean out the session
Debug.Assert(_cache.Count == 0, "SessionPool is disposed, but there are still sessions in the cache?");
disposeSession = true;
}
else if ((okToReuse) && (_freeStateObjectCount < MaxInactiveCount))
{
// Session is good to re-use and our cache has space
Debug.Assert(!session._pendingData, "pending data on a pooled session?");
_freeStateObjects[_freeStateObjectCount] = session;
_freeStateObjectCount++;
}
else
{
// Either the session is bad, or we have no cache space - so dispose the session and remove it
bool removed = _cache.Remove(session);
Debug.Assert(removed, "session not in pool?");
disposeSession = true;
}
session.RemoveOwner();
}
if (disposeSession)
{
_parser.Connection._parserLock.Wait(canReleaseFromAnyThread: false);
try
{
session.Dispose();
}
finally
{
_parser.Connection._parserLock.Release();
}
}
}
/// <summary>
/// Enables MARS for a TdsParserStateObject and returns its new handle.
/// </summary>
public static SNIMarsHandle EnableMars(TdsParserStateObject stateObject, out SNIError sniError)
{
Debug.Assert(!(stateObject.Handle is SNIMarsHandle), "Cannot enable MARS on a SNIMarsHandle");
SNIMarsConnection marsConnection = new SNIMarsConnection(stateObject.Handle);
marsConnection.StartReceive();
return(marsConnection.CreateSession(stateObject, out sniError));
}
internal TdsValueSetter(TdsParserStateObject stateObj, SmiMetaData md)
{
this._stateObj = stateObj;
this._metaData = md;
this._isPlp = MetaDataUtilsSmi.IsPlpFormat(md);
this._plpUnknownSent = false;
this._encoder = null;
}
protected override void CreateSessionHandle(TdsParserStateObject physicalConnection, bool async)
{
Debug.Assert(physicalConnection is TdsParserStateObjectNative, "Expected a stateObject of type " + this.GetType());
TdsParserStateObjectNative nativeSNIObject = physicalConnection as TdsParserStateObjectNative;
SNINativeMethodWrapper.ConsumerInfo myInfo = CreateConsumerInfo(async);
_sessionHandle = new SNIHandle(myInfo, nativeSNIObject.Handle);
}
internal void SynchronizedPush(TdsParserStateObject value)
{
lock (this)
{
value.NextPooledObject = this._stack;
this._stack = value;
}
}
protected override void CreateSessionHandle(TdsParserStateObject physicalConnection, bool async)
{
Debug.Assert(physicalConnection is TdsParserStateObjectManaged, "Expected a stateObject of type " + GetType());
TdsParserStateObjectManaged managedSNIObject = physicalConnection as TdsParserStateObjectManaged;
_sessionHandle = managedSNIObject.CreateMarsSession(this, async);
SqlClientEventSource.Log.TryTraceEvent("TdsParserStateObjectManaged.CreateSessionHandle | Info | State Object Id {0}, Session Id {1}", _objectID, _sessionHandle?.ConnectionId);
}
internal TdsRecordBufferSetter(TdsParserStateObject stateObj, SmiMetaData md)
{
this._fieldSetters = new TdsValueSetter[md.FieldMetaData.Count];
for (int i = 0; i < md.FieldMetaData.Count; i++)
{
this._fieldSetters[i] = new TdsValueSetter(stateObj, md.FieldMetaData[i]);
}
this._stateObj = stateObj;
this._metaData = md;
}
internal SqlCommand FindLiveCommand(TdsParserStateObject stateObj)
{
SqlCommand command = null;
SqlReferenceCollection referenceCollection = (SqlReferenceCollection)ReferenceCollection;
if (null != referenceCollection)
{
command = referenceCollection.FindLiveCommand(stateObj);
}
return command;
}
public SNIMarsHandle CreateSession(TdsParserStateObject callbackObject, out SNIError sniError)
{
lock (this)
{
ushort sessionId = _nextSessionId++;
SNIMarsHandle handle = new SNIMarsHandle(this, sessionId, callbackObject, out sniError);
_sessions.Add(sessionId, handle);
return(handle);
}
}
private int _currentOffset; // for chunking, verify that caller is using correct offsets
#endif
#endregion
#region Exposed Construct/factory methods
internal TdsValueSetter(TdsParserStateObject stateObj, SmiMetaData md)
{
_stateObj = stateObj;
_metaData = md;
_isPlp = MetaDataUtilsSmi.IsPlpFormat(md);
_plpUnknownSent = false;
_encoder = null;
#if DEBUG
_currentOffset = 0;
#endif
}
internal TdsParserStateObject CreateSessionObject(TdsParser tdsParser, TdsParserStateObject _pMarsPhysicalConObj, bool v)
{
if (TdsParserStateObjectFactory.UseManagedSNI)
{
return(new TdsParserStateObjectManaged(tdsParser, _pMarsPhysicalConObj, true));
}
else
{
return(new TdsParserStateObjectNative(tdsParser, _pMarsPhysicalConObj, true));
}
}
private static void WriteDispatcher(IntPtr key, IntPtr packet, uint error)
{
if (IntPtr.Zero != key)
{
GCHandle handle = (GCHandle)key;
TdsParserStateObject target = (TdsParserStateObject)handle.Target;
if (target != null)
{
target.WriteAsyncCallback(IntPtr.Zero, packet, error);
}
}
}
protected override void CreateSessionHandle(TdsParserStateObject physicalConnection, bool async)
{
Debug.Assert(physicalConnection is TdsParserStateObjectNative, "Expected a stateObject of type " + this.GetType());
TdsParserStateObjectNative nativeSNIObject = physicalConnection as TdsParserStateObjectNative;
SNINativeMethodWrapper.ConsumerInfo myInfo = CreateConsumerInfo(async);
SQLDNSInfo cachedDNSInfo;
bool ret = SQLFallbackDNSCache.Instance.GetDNSInfo(_parser.FQDNforDNSCahce, out cachedDNSInfo);
_sessionHandle = new SNIHandle(myInfo, nativeSNIObject.Handle, cachedDNSInfo);
}
// Reads off from the network buffer and caches bytes. Only reads one column value in the current row.
static internal bool TryCreate(SqlMetaDataPriv metadata, TdsParser parser, TdsParserStateObject stateObj, out SqlCachedBuffer buffer)
{
int cb = 0;
ulong plplength;
byte[] byteArr;
List <byte[]> cachedBytes = new List <byte[]>();
buffer = null;
// the very first length is already read.
if (!parser.TryPlpBytesLeft(stateObj, out plplength))
{
return(false);
}
// For now we only handle Plp data from the parser directly.
Debug.Assert(metadata.metaType.IsPlp, "SqlCachedBuffer call on a non-plp data");
do
{
if (plplength == 0)
{
break;
}
do
{
cb = (plplength > (ulong)_maxChunkSize) ? _maxChunkSize : (int)plplength;
byteArr = new byte[cb];
if (!stateObj.TryReadPlpBytes(ref byteArr, 0, cb, out cb))
{
return(false);
}
Debug.Assert(cb == byteArr.Length);
if (cachedBytes.Count == 0)
{
// Add the Byte order mark if needed if we read the first array
AddByteOrderMark(byteArr, cachedBytes);
}
cachedBytes.Add(byteArr);
plplength -= (ulong)cb;
} while (plplength > 0);
if (!parser.TryPlpBytesLeft(stateObj, out plplength))
{
return(false);
}
} while (plplength > 0);
Debug.Assert(stateObj._longlen == 0 && stateObj._longlenleft == 0);
buffer = new SqlCachedBuffer(cachedBytes);
return(true);
}
private int _currentField; // validate that caller sets columns in correct order.
#endif
#endregion
#region Exposed Construct and control methods/properties
internal TdsRecordBufferSetter(TdsParserStateObject stateObj, SmiMetaData md)
{
Debug.Assert(SqlDbType.Structured == md.SqlDbType, "Unsupported SqlDbType: " + md.SqlDbType);
_fieldSetters = new TdsValueSetter[md.FieldMetaData.Count];
for (int i = 0; i < md.FieldMetaData.Count; i++)
{
_fieldSetters[i] = new TdsValueSetter(stateObj, md.FieldMetaData[i]);
}
_stateObj = stateObj;
_metaData = md;
#if DEBUG
_currentField = ReadyForToken;
#endif
}
// This is called from a ThreadAbort - ensure that it can be run from a CER Catch
internal void BestEffortCleanup()
{
for (int i = 0; i < _cache.Count; i++)
{
TdsParserStateObject session = _cache[i];
if (null != session)
{
var sessionHandle = session.Handle;
if (sessionHandle != null)
{
sessionHandle.Dispose();
}
}
}
}
internal TdsParserStateObject SynchronizedPop()
{
TdsParserStateObject obj2;
lock (this)
{
obj2 = this._stack;
if (obj2 != null)
{
this._stack = obj2.NextPooledObject;
obj2.NextPooledObject = null;
}
}
return(obj2);
}
internal TdsParserStateObject CreateSession()
{
TdsParserStateObject item = this._parser.CreateSession();
lock (this._cache)
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.CreateSession|ADV> %d# adding session %d to pool\n", this.ObjectID, item.ObjectID);
}
this._cache.Add(item);
this._cachedCount = this._cache.Count;
}
return(item);
}
internal TdsParserStateObject GetSession(object owner)
{
TdsParserStateObject obj2 = this._freeStack.SynchronizedPop();
if (obj2 == null)
{
obj2 = this.CreateSession();
}
obj2.Activate(owner);
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.GetSession|ADV> %d# using session %d\n", this.ObjectID, obj2.ObjectID);
}
return(obj2);
}
internal void Deactivate()
{
// When being deactivated, we check all the sessions in the
// cache to make sure they're cleaned up and then we dispose of
// sessions that are past what we want to keep around.
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<sc.TdsParserSessionPool.Deactivate|ADV> %d# deactivating cachedCount=%d\n", ObjectID, _cachedCount);
try
{
lock (_cache)
{
// NOTE: The PutSession call below may choose to remove the
// session from the cache, which will throw off our
// enumerator. We avoid that by simply indexing backward
// through the array.
for (int i = _cache.Count - 1; i >= 0; i--)
{
TdsParserStateObject session = _cache[i];
if (null != session)
{
if (session.IsOrphaned)
{
// TODO: consider adding a performance counter for the number of sessions we reclaim
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.Deactivate|ADV> %d# reclaiming session %d\n", ObjectID, session.ObjectID);
}
PutSession(session);
}
}
}
// TODO: re-enable this assert when the connection isn't doomed.
//Debug.Assert (_cachedCount < MaxInactiveCount, "non-orphaned connection past initial allocation?");
}
}
finally
{
Bid.ScopeLeave(ref hscp);
}
}
internal void PutSession(TdsParserStateObject session)
{
Debug.Assert(null != session, "null session?");
//Debug.Assert(null != session.Owner, "session without owner?");
bool okToReuse = session.Deactivate();
lock (_cache)
{
if (IsDisposed)
{
// We're diposed - just clean out the session
Debug.Assert(_cachedCount == 0, "SessionPool is disposed, but there are still sessions in the cache?");
session.Dispose();
}
else if ((okToReuse) && (_freeStateObjectCount < MaxInactiveCount))
{
// Session is good to re-use and our cache has space
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.PutSession|ADV> %d# keeping session %d cachedCount=%d\n", ObjectID, session.ObjectID, _cachedCount);
}
Debug.Assert(!session._pendingData, "pending data on a pooled session?");
_freeStateObjects[_freeStateObjectCount] = session;
_freeStateObjectCount++;
}
else
{
// Either the session is bad, or we have no cache space - so dispose the session and remove it
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.PutSession|ADV> %d# disposing session %d cachedCount=%d\n", ObjectID, session.ObjectID, _cachedCount);
}
bool removed = _cache.Remove(session);
Debug.Assert(removed, "session not in pool?");
_cachedCount = _cache.Count;
session.Dispose();
}
session.RemoveOwner();
}
}
internal void Deactivate()
{
// When being deactivated, we check all the sessions in the
// cache to make sure they're cleaned up and then we dispose of
// sessions that are past what we want to keep around.
IntPtr hscp;
Bid.ScopeEnter(out hscp, "<sc.TdsParserSessionPool.Deactivate|ADV> %d# deactivating cachedCount=%d\n", ObjectID, _cachedCount);
try {
lock (_cache) {
// NOTE: The PutSession call below may choose to remove the
// session from the cache, which will throw off our
// enumerator. We avoid that by simply indexing backward
// through the array.
for (int i = _cache.Count - 1; i >= 0; i--)
{
TdsParserStateObject session = _cache[i];
if (null != session)
{
if (session.IsOrphaned)
{
//
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.TdsParserSessionPool.Deactivate|ADV> %d# reclaiming session %d\n", ObjectID, session.ObjectID);
}
PutSession(session);
}
}
}
//
}
}
finally {
Bid.ScopeLeave(ref hscp);
}
}
static private void ReadDispatcher(IntPtr key, IntPtr packet, UInt32 error)
{
// This is the app-domain dispatcher for all async read callbacks, It
// simply gets the state object from the key that it is passed, and
// calls the state object's read callback.
Debug.Assert(IntPtr.Zero != key, "no key passed to read callback dispatcher?");
if (IntPtr.Zero != key)
{
// NOTE: we will get a null ref here if we don't get a key that
// contains a GCHandle to TDSParserStateObject; that is
// very bad, and we want that to occur so we can catch it.
GCHandle gcHandle = (GCHandle)key;
TdsParserStateObject stateObj = (TdsParserStateObject)gcHandle.Target;
if (null != stateObj)
{
stateObj.ReadAsyncCallback(IntPtr.Zero, packet, error);
}
}
}
