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 * 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
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#ifndef _CONNECTIVITY_ZCONNECTIONPOOL_HXX_
#define _CONNECTIVITY_ZCONNECTIONPOOL_HXX_

#include <com/sun/star/lang/XEventListener.hpp>
#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/weakref.hxx>
#include <cppuhelper/implbase1.hxx>
#include <comphelper/stl_types.hxx>
#include <osl/mutex.hxx>
#include <vos/timer.hxx>
#include <vos/ref.hxx>
#include <rtl/digest.h>

namespace connectivity
{
	class OConnectionPool;
	//==========================================================================
	/// OPoolTimer - Invalidates the connection pool
	//==========================================================================
	class OPoolTimer : public ::vos::OTimer
	{
		OConnectionPool* m_pPool;
	public:
		OPoolTimer(OConnectionPool* _pPool,const ::vos::TTimeValue& _Time)
			: ::vos::OTimer(_Time)
			,m_pPool(_pPool)
		{}
	protected:
		virtual void SAL_CALL onShot();
	};

	//==========================================================================
	//= OConnectionPool - the one-instance service for PooledConnections
	//= manages the active connections and the connections in the pool
	//==========================================================================
	typedef	::cppu::WeakImplHelper1< ::com::sun::star::beans::XPropertyChangeListener>	OConnectionPool_Base;

	// typedef for the internal structure
	typedef ::std::vector< ::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XPooledConnection> > TPooledConnections;

	 // contains the currently pooled connections
	typedef struct
	{
		TPooledConnections	aConnections;
		sal_Int32			nALiveCount; // will be decremented every time a time says to, when will reach zero the pool will be deleted
	} TConnectionPool;

	struct TDigestHolder
	{
		sal_uInt8 m_pBuffer[RTL_DIGEST_LENGTH_SHA1];
		TDigestHolder()
		{
			m_pBuffer[0] = 0;
		}

	};

	//	typedef TDigestHolder

	struct TDigestLess : public ::std::binary_function< TDigestHolder, TDigestHolder, bool>
	{
		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 a activeconnection which is needed to put it back to the pool
	typedef struct
	{
		TConnectionMap::iterator aPos;
		::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XPooledConnection> xPooledConnection;
	} TActiveConnectionInfo;

	typedef ::std::map< ::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XConnection>,
						TActiveConnectionInfo> TActiveConnectionMap;

	class OConnectionPool : public OConnectionPool_Base
	{
		TConnectionMap			m_aPool;				// the pooled connections
		TActiveConnectionMap	m_aActiveConnections;	// the currently active connections

		::osl::Mutex			m_aMutex;
		::vos::ORef<OPoolTimer>	m_xInvalidator;			// invalidates the connection pool when shot

		::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XDriver >				m_xDriver;		// the one and only driver for this connection pool
		::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface >			m_xDriverNode;	// config node entry
		::com::sun::star::uno::Reference< ::com::sun::star::reflection::XProxyFactory >	m_xProxyFactory;
		sal_Int32				m_nTimeOut;
		sal_Int32				m_nALiveCount;

	private:
		::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XConnection> createNewConnection(const ::rtl::OUString& _rURL,
								const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue >& _rInfo);
		::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XConnection> getPooledConnection(TConnectionMap::iterator& _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();
	public:
		OConnectionPool(const ::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XDriver >& _xDriver,
						const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface >& _xDriverNode,
						const ::com::sun::star::uno::Reference< ::com::sun::star::reflection::XProxyFactory >& _rxProxyFactory);

		// delete all refs
		void clear(sal_Bool _bDispose);
		::com::sun::star::uno::Reference< ::com::sun::star::sdbc::XConnection > SAL_CALL getConnectionWithInfo( const ::rtl::OUString& url, const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue >& info ) throw(::com::sun::star::sdbc::SQLException, ::com::sun::star::uno::RuntimeException);
		// XEventListener
		virtual void SAL_CALL disposing( const ::com::sun::star::lang::EventObject& Source ) throw (::com::sun::star::uno::RuntimeException);
		// XPropertyChangeListener
		virtual void SAL_CALL propertyChange( const ::com::sun::star::beans::PropertyChangeEvent& evt ) throw (::com::sun::star::uno::RuntimeException);

		void invalidatePooledConnections();
	};
}
#endif // _CONNECTIVITY_ZCONNECTIONPOOL_HXX_