diff options
Diffstat (limited to 'dbaccess/source/sdbtools/inc')
| -rw-r--r-- | dbaccess/source/sdbtools/inc/connectiondependent.hxx | 135 | ||||
| -rw-r--r-- | dbaccess/source/sdbtools/inc/connectiontools.hxx | 77 |
2 files changed, 212 insertions, 0 deletions
diff --git a/dbaccess/source/sdbtools/inc/connectiondependent.hxx b/dbaccess/source/sdbtools/inc/connectiondependent.hxx new file mode 100644 index 000000000..d315d7018 --- /dev/null +++ b/dbaccess/source/sdbtools/inc/connectiondependent.hxx @@ -0,0 +1,135 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#pragma once + +#include <com/sun/star/sdbc/XConnection.hpp> +#include <com/sun/star/lang/DisposedException.hpp> +#include <com/sun/star/uno/XComponentContext.hpp> + +#include <cppuhelper/weakref.hxx> +#include <osl/mutex.hxx> + +namespace sdbtools +{ + + // ConnectionDependentComponent + class ConnectionDependentComponent + { + private: + mutable ::osl::Mutex m_aMutex; + css::uno::WeakReference< css::sdbc::XConnection > + m_aConnection; + css::uno::Reference< css::uno::XComponentContext > + m_aContext; + + /** a hard reference to the connection we're working for + + This member is only valid as long as a EntryGuard is on the stack. + The guard will, in its constructor, set the member, and reset it in its destructor. + This ensures that the connection is only held hard when it's needed, and weak otherwise. + */ + css::uno::Reference< css::sdbc::XConnection > + m_xConnection; + + protected: + ::osl::Mutex& getMutex() const { return m_aMutex; } + + const css::uno::Reference< css::uno::XComponentContext >& + getContext() const { return m_aContext; } + + protected: + class EntryGuard; + + protected: + explicit ConnectionDependentComponent( const css::uno::Reference< css::uno::XComponentContext > & _rContext ) + :m_aContext( _rContext ) + { + } + + /** sets the connection we depend on. + + To be called exactly once. + + @param _rxConnection + the connection to set + */ + void setWeakConnection( const css::uno::Reference< css::sdbc::XConnection >& _rxConnection ) + { + m_aConnection = _rxConnection; + } + + const css::uno::Reference< css::sdbc::XConnection >& + getConnection() const { return m_xConnection; } + + public: + struct GuardAccess; + friend struct GuardAccess; + /** helper for granting exclusive access to various other methods + */ + struct GuardAccess { friend class EntryGuard; private: GuardAccess() { } }; + + ::osl::Mutex& getMutex( GuardAccess ) const { return m_aMutex; } + + bool acquireConnection( GuardAccess ) + { + m_xConnection.set(m_aConnection); + return m_xConnection.is(); + } + void releaseConnection( GuardAccess ) + { + m_xConnection.clear(); + } + }; + + // ConnectionDependentComponent::EntryGuard + /** a class for guarding methods of a connection-dependent component + + This class serves multiple purposes: + <ul><li>It ensures multi-threading safety by guarding the component's mutex + as long as it lives.</li> + <li>It ensures that the component's connection is alive. The constructor + throws a DisposedException if no hard reference to the connection can + be obtained.</li> + </ul> + */ + class ConnectionDependentComponent::EntryGuard + { + private: + ::osl::MutexGuard m_aMutexGuard; + ConnectionDependentComponent& m_rComponent; + + public: + explicit EntryGuard( ConnectionDependentComponent& _rComponent ) + :m_aMutexGuard( _rComponent.getMutex( ConnectionDependentComponent::GuardAccess() ) ) + ,m_rComponent( _rComponent ) + { + if ( !m_rComponent.acquireConnection( ConnectionDependentComponent::GuardAccess() ) ) + throw css::lang::DisposedException(); + } + + ~EntryGuard() + { + m_rComponent.releaseConnection( ConnectionDependentComponent::GuardAccess() ); + } + }; + +} // namespace sdbtools + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ diff --git a/dbaccess/source/sdbtools/inc/connectiontools.hxx b/dbaccess/source/sdbtools/inc/connectiontools.hxx new file mode 100644 index 000000000..876f713af --- /dev/null +++ b/dbaccess/source/sdbtools/inc/connectiontools.hxx @@ -0,0 +1,77 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#pragma once + +#include "connectiondependent.hxx" + +#include <com/sun/star/sdb/tools/XConnectionTools.hpp> +#include <com/sun/star/lang/XServiceInfo.hpp> +#include <com/sun/star/lang/XInitialization.hpp> +#include <com/sun/star/uno/XComponentContext.hpp> + +#include <cppuhelper/implbase.hxx> + +namespace sdbtools +{ + + // ConnectionTools + typedef ::cppu::WeakImplHelper< css::sdb::tools::XConnectionTools + , css::lang::XServiceInfo + , css::lang::XInitialization + > ConnectionTools_Base; + /** implements the css::sdb::tools::XConnectionTools functionality + */ + class ConnectionTools :public ConnectionTools_Base + ,public ConnectionDependentComponent + { + public: + /** constructs a ConnectionTools instance + + @param _rxContext + the context of the component + */ + explicit ConnectionTools( const css::uno::Reference< css::uno::XComponentContext >& _rContext ); + + // XConnectionTools + virtual css::uno::Reference< css::sdb::tools::XTableName > SAL_CALL createTableName() override; + virtual css::uno::Reference< css::sdb::tools::XObjectNames > SAL_CALL getObjectNames() override; + virtual css::uno::Reference< css::sdb::tools::XDataSourceMetaData > SAL_CALL getDataSourceMetaData() override; + virtual css::uno::Reference< css::container::XNameAccess > SAL_CALL getFieldsByCommandDescriptor( ::sal_Int32 commandType, const OUString& command, css::uno::Reference< css::lang::XComponent >& keepFieldsAlive ) override; + virtual css::uno::Reference< css::sdb::XSingleSelectQueryComposer > SAL_CALL getComposer( ::sal_Int32 commandType, const OUString& command ) override; + + // XServiceInfo + virtual OUString SAL_CALL getImplementationName() override; + virtual sal_Bool SAL_CALL supportsService(const OUString & ServiceName) override; + virtual css::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override; + + // XInitialization + virtual void SAL_CALL initialize(const css::uno::Sequence< css::uno::Any > & aArguments) override; + + protected: + virtual ~ConnectionTools() override; + + private: + ConnectionTools( const ConnectionTools& ) = delete; + ConnectionTools& operator=( const ConnectionTools& ) = delete; + }; + +} // namespace sdbtools + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |