230 lines
8.2 KiB
C++
230 lines
8.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <connectivity/conncleanup.hxx>
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#include <com/sun/star/beans/XPropertySet.hpp>
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#include <com/sun/star/lang/XComponent.hpp>
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#include <com/sun/star/sdbc/XRowSet.hpp>
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#include <com/sun/star/sdbc/XConnection.hpp>
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#include <osl/diagnose.h>
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#include <comphelper/diagnose_ex.hxx>
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namespace dbtools
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{
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using namespace css::uno;
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using namespace css::beans;
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using namespace css::sdbc;
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using namespace css::lang;
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constexpr OUString ACTIVE_CONNECTION_PROPERTY_NAME = u"ActiveConnection"_ustr;
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OAutoConnectionDisposer::OAutoConnectionDisposer(const Reference< XRowSet >& _rxRowSet, const Reference< XConnection >& _rxConnection)
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:m_xRowSet( _rxRowSet )
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,m_bRSListening( false )
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,m_bPropertyListening( false )
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{
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Reference< XPropertySet > xProps(_rxRowSet, UNO_QUERY);
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OSL_ENSURE(xProps.is(), "OAutoConnectionDisposer::OAutoConnectionDisposer: invalid rowset (no XPropertySet)!");
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if (!xProps.is())
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return;
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try
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{
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xProps->setPropertyValue( ACTIVE_CONNECTION_PROPERTY_NAME, Any( _rxConnection ) );
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m_xOriginalConnection = _rxConnection;
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startPropertyListening( xProps );
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}
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catch( const Exception& )
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{
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TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::OAutoConnectionDisposer" );
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}
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}
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void OAutoConnectionDisposer::startPropertyListening( const Reference< XPropertySet >& _rxRowSet )
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{
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try
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{
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_rxRowSet->addPropertyChangeListener( ACTIVE_CONNECTION_PROPERTY_NAME, this );
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m_bPropertyListening = true;
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}
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catch( const Exception& )
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{
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TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::startPropertyListening" );
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}
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}
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void OAutoConnectionDisposer::stopPropertyListening( const Reference< XPropertySet >& _rxEventSource )
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{
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// prevent deletion of ourself while we're herein
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Reference< XInterface > xKeepAlive(getXWeak());
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try
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{ // remove ourself as property change listener
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OSL_ENSURE( _rxEventSource.is(), "OAutoConnectionDisposer::stopPropertyListening: invalid event source (no XPropertySet)!" );
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if ( _rxEventSource.is() )
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{
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_rxEventSource->removePropertyChangeListener( ACTIVE_CONNECTION_PROPERTY_NAME, this );
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m_bPropertyListening = false;
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}
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}
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catch( const Exception& )
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{
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TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::stopPropertyListening" );
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}
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}
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void OAutoConnectionDisposer::startRowSetListening()
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{
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OSL_ENSURE( !m_bRSListening, "OAutoConnectionDisposer::startRowSetListening: already listening!" );
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try
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{
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if ( !m_bRSListening )
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m_xRowSet->addRowSetListener( this );
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}
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catch( const Exception& )
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{
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TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::startRowSetListening" );
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}
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m_bRSListening = true;
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}
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void OAutoConnectionDisposer::stopRowSetListening()
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{
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OSL_ENSURE( m_bRSListening, "OAutoConnectionDisposer::stopRowSetListening: not listening!" );
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try
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{
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m_xRowSet->removeRowSetListener( this );
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}
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catch( const Exception& )
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{
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TOOLS_WARN_EXCEPTION( "connectivity.commontools", "OAutoConnectionDisposer::stopRowSetListening" );
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}
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m_bRSListening = false;
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}
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void SAL_CALL OAutoConnectionDisposer::propertyChange( const PropertyChangeEvent& _rEvent )
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{
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if ( _rEvent.PropertyName != ACTIVE_CONNECTION_PROPERTY_NAME )
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return;
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// somebody set a new ActiveConnection
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Reference< XConnection > xNewConnection;
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_rEvent.NewValue >>= xNewConnection;
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if ( isRowSetListening() )
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{
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// we're listening at the row set, this means that the row set does not have our
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// m_xOriginalConnection as active connection anymore
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// So there are two possibilities
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// a. somebody sets a new connection which is not our original one
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// b. somebody sets a new connection, which is exactly the original one
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// a. we're not interested in a, but in b: In this case, we simply need to move to the state
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// we had originally: listen for property changes, do not listen for row set changes, and
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// do not dispose the connection until the row set does not need it anymore
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if ( xNewConnection.get() == m_xOriginalConnection.get() )
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{
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stopRowSetListening();
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}
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}
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else
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{
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// start listening at the row set. We're allowed to dispose the old connection as soon
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// as the RowSet changed
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// Unfortunately, the our database form implementations sometimes fire the change of their
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// ActiveConnection twice. This is an error in forms/source/component/DatabaseForm.cxx, but
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// changing this would require incompatible changes we can't do for a while.
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// So for the moment, we have to live with it here.
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//
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// The only scenario where this doubled notification causes problems is when the connection
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// of the form is reset to the one we're responsible for (m_xOriginalConnection), so we
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// check this here.
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//
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// Yes, this is a HACK :(
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if ( xNewConnection.get() != m_xOriginalConnection.get() )
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{
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#if OSL_DEBUG_LEVEL > 0
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Reference< XConnection > xOldConnection;
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_rEvent.OldValue >>= xOldConnection;
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OSL_ENSURE( xOldConnection.get() == m_xOriginalConnection.get(), "OAutoConnectionDisposer::propertyChange: unexpected (original) property value!" );
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#endif
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startRowSetListening();
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}
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}
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}
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void SAL_CALL OAutoConnectionDisposer::disposing( const EventObject& _rSource )
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{
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// the rowset is being disposed, and nobody has set a new ActiveConnection in the meantime
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if ( isRowSetListening() )
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stopRowSetListening();
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clearConnection();
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if ( m_bPropertyListening )
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stopPropertyListening( Reference< XPropertySet >( _rSource.Source, UNO_QUERY ) );
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}
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void OAutoConnectionDisposer::clearConnection()
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{
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try
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{
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// dispose the old connection
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Reference< XComponent > xComp(m_xOriginalConnection, UNO_QUERY);
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if (xComp.is())
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xComp->dispose();
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m_xOriginalConnection.clear();
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}
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catch(Exception&)
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{
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TOOLS_WARN_EXCEPTION("connectivity.commontools", "OAutoConnectionDisposer::clearConnection");
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}
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}
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void SAL_CALL OAutoConnectionDisposer::cursorMoved( const css::lang::EventObject& /*event*/ )
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{
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}
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void SAL_CALL OAutoConnectionDisposer::rowChanged( const css::lang::EventObject& /*event*/ )
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{
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}
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void SAL_CALL OAutoConnectionDisposer::rowSetChanged( const css::lang::EventObject& /*event*/ )
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{
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stopRowSetListening();
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clearConnection();
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}
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} // namespace dbtools
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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