Exemple #1
0
 internal virtual bool TryReplaceConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource <DbConnectionInternal> retry, DbConnectionOptions userOptions)
 {
     throw ADP.MethodNotImplemented("TryReplaceConnection");
 }
Exemple #2
0
        internal virtual void CloseConnection(DbConnection owningObject, DbConnectionFactory connectionFactory)
        {
            // The implementation here is the implementation required for the
            // "open" internal connections, since our own private "closed"
            // singleton internal connection objects override this method to
            // prevent anything funny from happening (like disposing themselves
            // or putting them into a connection pool)
            //
            // Derived class should override DbConnectionInternal.Deactivate and DbConnectionInternal.Dispose
            // for cleaning up after DbConnection.Close
            //     protected override void Deactivate() { // override DbConnectionInternal.Close
            //         // do derived class connection deactivation for both pooled & non-pooled connections
            //     }
            //     public override void Dispose() { // override DbConnectionInternal.Close
            //         // do derived class cleanup
            //         base.Dispose();
            //     }
            //
            // overriding DbConnection.Close is also possible, but must provider for their own synchronization
            //     public override void Close() { // override DbConnection.Close
            //         base.Close();
            //         // do derived class outer connection for both pooled & non-pooled connections
            //         // user must do their own synchronization here
            //     }
            //
            //     if the DbConnectionInternal derived class needs to close the connection it should
            //     delegate to the DbConnection if one exists or directly call dispose
            //         DbConnection owningObject = (DbConnection)Owner;
            //         if (null != owningObject) {
            //             owningObject.Close(); // force the closed state on the outer object.
            //         }
            //         else {
            //             Dispose();
            //         }
            //
            ////////////////////////////////////////////////////////////////
            // DON'T MESS WITH THIS CODE UNLESS YOU KNOW WHAT YOU'RE DOING!
            ////////////////////////////////////////////////////////////////
            Debug.Assert(null != owningObject, "null owningObject");
            Debug.Assert(null != connectionFactory, "null connectionFactory");


            // if an exception occurs after the state change but before the try block
            // the connection will be stuck in OpenBusy state.  The commented out try-catch
            // block doesn't really help because a ThreadAbort during the finally block
            // would just refert the connection to a bad state.
            // Open->Closed: guarantee internal connection is returned to correct pool
            if (connectionFactory.SetInnerConnectionFrom(owningObject, DbConnectionOpenBusy.SingletonInstance, this))
            {
                // Lock to prevent race condition with cancellation
                lock (this)
                {
                    object lockToken = ObtainAdditionalLocksForClose();
                    try
                    {
                        PrepareForCloseConnection();

                        DbConnectionPool connectionPool = Pool;


                        // The singleton closed classes won't have owners and
                        // connection pools, and we won't want to put them back
                        // into the pool.
                        if (null != connectionPool)
                        {
                            connectionPool.PutObject(this, owningObject);   // PutObject calls Deactivate for us...
                                                                            // NOTE: Before we leave the PutObject call, another
                                                                            // thread may have already popped the connection from
                                                                            // the pool, so don't expect to be able to verify it.
                        }
                        else
                        {
                            Deactivate();   // ensure we de-activate non-pooled connections, or the data readers and transactions may not get cleaned up...

                            // To prevent an endless recursion, we need to clear
                            // the owning object before we call dispose so that
                            // we can't get here a second time... Ordinarily, I
                            // would call setting the owner to null a hack, but
                            // this is safe since we're about to dispose the
                            // object and it won't have an owner after that for
                            // certain.
                            _owningObject.Target = null;

                            Dispose();
                        }
                    }
                    finally
                    {
                        ReleaseAdditionalLocksForClose(lockToken);
                        // if a ThreadAbort puts us here then its possible the outer connection will not reference
                        // this and this will be orphaned, not reclaimed by object pool until outer connection goes out of scope.
                        connectionFactory.SetInnerConnectionEvent(owningObject, DbConnectionClosedPreviouslyOpened.SingletonInstance);
                    }
                }
            }
        }
Exemple #3
0
 /// <devdoc>The default implementation is for the open connection objects, and
 /// it simply throws.  Our private closed-state connection objects
 /// override this and do the correct thing.</devdoc>
 // User code should either override DbConnectionInternal.Activate when it comes out of the pool
 // or override DbConnectionFactory.CreateConnection when the connection is created for non-pooled connections
 internal virtual bool TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource <DbConnectionInternal> retry, DbConnectionOptions userOptions)
 {
     throw ADP.ConnectionAlreadyOpen(State);
 }
        internal DbConnectionPool GetConnectionPool(DbConnectionFactory connectionFactory)
        {
            // When this method returns null it indicates that the connection
            // factory should not use pooling.

            // We don't support connection pooling on Win9x;
            // PoolGroupOptions will only be null when we're not supposed to pool
            // connections.
            DbConnectionPool pool = null;

            if (null != _poolGroupOptions)
            {
                DbConnectionPoolIdentity currentIdentity = DbConnectionPoolIdentity.NoIdentity;

                if (_poolGroupOptions.PoolByIdentity)
                {
                    // There is no concept of Windows identity on non-Windows platform. Hence we
                    // cannot support Windows authentication.
                    if (!ADP.IsWindows)
                    {
                        throw new PlatformNotSupportedException(SR.GetString(SR.ADP_FeatureNotSupportedOnNonWindowsPlatform, DbConnectionStringKeywords.IntegratedSecurity));
                    }

                    // if we're pooling by identity (because integrated security is
                    // being used for these connections) then we need to go out and
                    // search for the connectionPool that matches the current identity.

                    currentIdentity = DbConnectionPoolIdentity.GetCurrent();

                    // If the current token is restricted in some way, then we must
                    // not attempt to pool these connections.
                    if (currentIdentity.IsRestricted)
                    {
                        currentIdentity = null;
                    }
                }
                if (null != currentIdentity)
                {
                    if (!_poolCollection.TryGetValue(currentIdentity, out pool))
                    { // find the pool
                        DbConnectionPoolProviderInfo connectionPoolProviderInfo = connectionFactory.CreateConnectionPoolProviderInfo(this.ConnectionOptions);

                        // optimistically create pool, but its callbacks are delayed until after actual add
                        DbConnectionPool newPool = new DbConnectionPool(connectionFactory, this, currentIdentity, connectionPoolProviderInfo);

                        lock (this)
                        {
                            // Did someone already add it to the list?
                            if (!_poolCollection.TryGetValue(currentIdentity, out pool))
                            {
                                if (MarkPoolGroupAsActive())
                                {
                                    // If we get here, we know for certain that we there isn't
                                    // a pool that matches the current identity, so we have to
                                    // add the optimistically created one
                                    newPool.Startup(); // must start pool before usage
                                    bool addResult = _poolCollection.TryAdd(currentIdentity, newPool);
                                    Debug.Assert(addResult, "No other pool with current identity should exist at this point");
                                    pool    = newPool;
                                    newPool = null;
                                }
                                else
                                {
                                    // else pool entry has been disabled so don't create new pools
                                    Debug.Assert(PoolGroupStateDisabled == _state, "state should be disabled");
                                }
                            }
                            else
                            {
                                // else found an existing pool to use instead
                                Debug.Assert(PoolGroupStateActive == _state, "state should be active since a pool exists and lock holds");
                            }
                        }

                        if (null != newPool)
                        {
                            // don't need to call connectionFactory.QueuePoolForRelease(newPool) because
                            // pool callbacks were delayed and no risk of connections being created
                            newPool.Shutdown();
                        }
                    }
                    // the found pool could be in any state
                }
            }

            if (null == pool)
            {
                lock (this)
                {
                    // keep the pool entry state active when not pooling
                    MarkPoolGroupAsActive();
                }
            }
            return(pool);
        }