Exemplo n.º 1
0
        protected bool TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource <DbConnectionInternal> retry, DbConnectionOptions userOptions)
        {
            // ?->Connecting: prevent set_ConnectionString during Open
            if (connectionFactory.SetInnerConnectionFrom(outerConnection, DbConnectionClosedConnecting.SingletonInstance, this))
            {
                DbConnectionInternal openConnection = null;
                try
                {
                    connectionFactory.PermissionDemand(outerConnection);
                    if (!connectionFactory.TryGetConnection(outerConnection, retry, userOptions, this, out openConnection))
                    {
                        return(false);
                    }
                }
                catch
                {
                    // This should occure for all exceptions, even ADP.UnCatchableExceptions.
                    connectionFactory.SetInnerConnectionTo(outerConnection, this);
                    throw;
                }
                if (null == openConnection)
                {
                    connectionFactory.SetInnerConnectionTo(outerConnection, this);
                    throw ADP.InternalConnectionError(ADP.ConnectionError.GetConnectionReturnsNull);
                }
                connectionFactory.SetInnerConnectionEvent(outerConnection, openConnection);
            }

            return(true);
        }
Exemplo n.º 2
0
        internal override bool TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource <DbConnectionInternal> retry, DbConnectionOptions userOptions)
        {
            if (retry == null || !retry.Task.IsCompleted)
            {
                // retry is null if this is a synchronous call

                // if someone calls Open or OpenAsync while in this state,
                // then the retry task will not be completed

                throw ADP.ConnectionAlreadyOpen(State);
            }

            // we are completing an asynchronous open
            Debug.Assert(retry.Task.Status == TaskStatus.RanToCompletion, "retry task must be completed successfully");
            DbConnectionInternal openConnection = retry.Task.Result;

            if (null == openConnection)
            {
                connectionFactory.SetInnerConnectionTo(outerConnection, this);
                throw ADP.InternalConnectionError(ADP.ConnectionError.GetConnectionReturnsNull);
            }
            connectionFactory.SetInnerConnectionEvent(outerConnection, openConnection);

            return(true);
        }
Exemplo n.º 3
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);
                    }
                }
            }
        }