connectiondependent.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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
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#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>
#include <utility>
 
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;
 
        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( css::uno::Reference< css::uno::XComponentContext > _xContext )
            :m_aContext(std::move( _xContext ))
        {
        }
 
        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;
        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
    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
 
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