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diff --git a/connectivity/source/cpool/ZConnectionPool.hxx b/connectivity/source/cpool/ZConnectionPool.hxx
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+++ b/connectivity/source/cpool/ZConnectionPool.hxx
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+/* -*- 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 <sal/config.h>
+
+#include <map>
+#include <vector>
+
+#include <com/sun/star/sdbc/XPooledConnection.hpp>
+#include <com/sun/star/sdbc/XDriver.hpp>
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <com/sun/star/beans/XPropertyChangeListener.hpp>
+#include <com/sun/star/reflection/XProxyFactory.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <osl/mutex.hxx>
+#include <salhelper/timer.hxx>
+#include <rtl/ref.hxx>
+#include <rtl/digest.h>
+
+namespace connectivity
+{
+    class OConnectionPool;
+
+    /// OPoolTimer - Invalidates the connection pool
+
+    class OPoolTimer : public ::salhelper::Timer
+    {
+        OConnectionPool* m_pPool;
+    public:
+        OPoolTimer(OConnectionPool* _pPool,const ::salhelper::TTimeValue& Time)
+            : ::salhelper::Timer(Time)
+            ,m_pPool(_pPool)
+        {}
+    protected:
+        virtual void SAL_CALL onShot() override;
+    };
+
+
+    // OConnectionPool - the one-instance service for PooledConnections
+    // manages the active connections and the connections in the pool
+
+    // typedef for the internal structure
+    typedef std::vector< css::uno::Reference< css::sdbc::XPooledConnection> > TPooledConnections;
+
+     // contains the currently pooled connections
+    struct TConnectionPool
+    {
+        TPooledConnections  aConnections;
+        sal_Int32           nALiveCount; // will be decremented every time a time says to, when will reach zero the pool will be deleted
+    };
+
+    struct TDigestHolder
+    {
+        sal_uInt8 m_pBuffer[RTL_DIGEST_LENGTH_SHA1];
+        TDigestHolder()
+        {
+            m_pBuffer[0] = 0;
+        }
+
+    };
+
+    //  typedef TDigestHolder
+
+    struct TDigestLess
+    {
+        bool operator() (const TDigestHolder& x, const TDigestHolder& y) const
+        {
+            sal_uInt32 i;
+            for(i=0;i < RTL_DIGEST_LENGTH_SHA1 && (x.m_pBuffer[i] >= y.m_pBuffer[i]); ++i)
+                ;
+            return i < RTL_DIGEST_LENGTH_SHA1;
+        }
+    };
+
+    typedef std::map< TDigestHolder,TConnectionPool,TDigestLess> TConnectionMap;
+
+    // contains additional information about an activeconnection which is needed to put it back to the pool
+    struct TActiveConnectionInfo
+    {
+        TConnectionMap::iterator aPos;
+        css::uno::Reference< css::sdbc::XPooledConnection> xPooledConnection;
+    };
+
+    typedef std::map< css::uno::Reference< css::sdbc::XConnection>,
+                        TActiveConnectionInfo> TActiveConnectionMap;
+
+    class OConnectionPool : public ::cppu::WeakImplHelper< css::beans::XPropertyChangeListener>
+    {
+        TConnectionMap          m_aPool;                // the pooled connections
+        TActiveConnectionMap    m_aActiveConnections;   // the currently active connections
+
+        ::osl::Mutex            m_aMutex;
+        ::rtl::Reference<OPoolTimer>    m_xInvalidator;         // invalidates the conntection pool when shot
+
+        css::uno::Reference< css::sdbc::XDriver >             m_xDriver;      // the one and only driver for this connectionpool
+        css::uno::Reference< css::uno::XInterface >           m_xDriverNode;  // config node entry
+        css::uno::Reference< css::reflection::XProxyFactory > m_xProxyFactory;
+        sal_Int32               m_nTimeOut;
+        sal_Int32               m_nALiveCount;
+
+    private:
+        css::uno::Reference< css::sdbc::XConnection> createNewConnection(const OUString& _rURL,
+                                const css::uno::Sequence< css::beans::PropertyValue >& _rInfo);
+        css::uno::Reference< css::sdbc::XConnection> getPooledConnection(TConnectionMap::iterator const & _rIter);
+        // calculate the timeout and the corresponding ALiveCount
+        void calculateTimeOuts();
+
+    protected:
+        // the dtor will be called from the last instance  (last release call)
+        virtual ~OConnectionPool() override;
+    public:
+        OConnectionPool(const css::uno::Reference< css::sdbc::XDriver >& _xDriver,
+                        const css::uno::Reference< css::uno::XInterface >& _xDriverNode,
+                        const css::uno::Reference< css::reflection::XProxyFactory >& _rxProxyFactory);
+
+        // delete all refs
+        void clear(bool _bDispose);
+        /// @throws css::sdbc::SQLException
+        /// @throws css::uno::RuntimeException
+        css::uno::Reference< css::sdbc::XConnection > getConnectionWithInfo( const OUString& url, const css::uno::Sequence< css::beans::PropertyValue >& info );
+        // XEventListener
+        virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override;
+        // XPropertyChangeListener
+        virtual void SAL_CALL propertyChange( const css::beans::PropertyChangeEvent& evt ) override;
+
+        void invalidatePooledConnections();
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */