/*************************************************************************
 *
 *  OpenOffice.org - a multi-platform office productivity suite
 *
 *  $RCSfile: readguard.hxx,v $
 *
 *  $Revision: 1.5 $
 *
 *  last change: $Author: rt $ $Date: 2005-09-09 00:37:28 $
 *
 *  The Contents of this file are made available subject to
 *  the terms of GNU Lesser General Public License Version 2.1.
 *
 *
 *    GNU Lesser General Public License Version 2.1
 *    =============================================
 *    Copyright 2005 by Sun Microsystems, Inc.
 *    901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License version 2.1, as published by the Free Software Foundation.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *    MA  02111-1307  USA
 *
 ************************************************************************/

#ifndef __FRAMEWORK_THREADHELP_READGUARD_HXX_
#define __FRAMEWORK_THREADHELP_READGUARD_HXX_

//_________________________________________________________________________________________________________________
//  my own includes
//_________________________________________________________________________________________________________________

#ifndef __FRAMEWORK_THREADHELP_INONCOPYABLE_H_
#include <threadhelp/inoncopyable.h>
#endif

#ifndef __FRAMEWORK_THREADHELP_IRWLOCK_H_
#include <threadhelp/irwlock.h>
#endif

//#ifndef __FRAMEWORK_THREADHELP_THREADHELPBASE_HXX_
//#include <threadhelp/threadhelpbase.hxx>
//#endif

//_________________________________________________________________________________________________________________
//  interface includes
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  other includes
//_________________________________________________________________________________________________________________

#ifndef _SAL_TYPES_H_
#include <sal/types.h>
#endif

//_________________________________________________________________________________________________________________
//  namespace
//_________________________________________________________________________________________________________________

namespace framework{

//_________________________________________________________________________________________________________________
//  const
//_________________________________________________________________________________________________________________

//_________________________________________________________________________________________________________________
//  declarations
//_________________________________________________________________________________________________________________

/*-************************************************************************************************************//**
    @short          implement a guard to set read locks
    @descr          This guard should be used to set a lock for reading object internal member.
                    Nobody can control it but don't use member after successfuly locking for writing!
                    We never need a own mutex to safe our internal member access - because
                    a guard is used as function-local member only. There exist no multithreaded access to it realy ...

    @attention      a) To prevent us against wrong using, the default ctor, copy ctor and the =operator are maked private!
                    b) Use interface "IRWLock" of set LockHelper only - because we must support a finer granularity of locking.
                       Interface "IMutex" should be used by easier guard implementations ... like "ResetableGuard"!

    @implements     -
    @base           INonCopyable

    @devstatus      ready to use
*//*-*************************************************************************************************************/
class ReadGuard : private INonCopyable
{
    //-------------------------------------------------------------------------------------------------------------
    //  public methods
    //-------------------------------------------------------------------------------------------------------------
    public:

        /*-****************************************************************************************************//**
            @short      ctor
            @descr      These ctors initialize the guard with a reference to used lock member of object to protect.
                        Null isn't allowed as value!

            @seealso    -

            @param      "pLock" ,reference to used lock member of object to protect
            @param      "rLock" ,reference to used lock member of object to protect
            @return     -

            @onerror    -
        *//*-*****************************************************************************************************/
        inline ReadGuard( IRWLock* pLock )
            :   m_pLock     ( pLock     )
            ,   m_bLocked   ( sal_False )
        {
            lock();
        }

        //*********************************************************************************************************
        inline ReadGuard( IRWLock& rLock )
            :   m_pLock     ( &rLock    )
            ,   m_bLocked   ( sal_False )
        {
            lock();
        }

        /*-****************************************************************************************************//**
            @short      dtor
            @descr      We unlock the used lock member automaticly if user forget it.

            @seealso    -

            @param      -
            @return     -

            @onerror    -
        *//*-*****************************************************************************************************/
        inline ~ReadGuard()
        {
            unlock();
        }

        /*-****************************************************************************************************//**
            @short      set read lock
            @descr      Call this method to set the read lock. The call will block till all current threads are synchronized!

            @seealso    method unlock()

            @param      -
            @return     -

            @onerror    -
        *//*-*****************************************************************************************************/
        inline void lock()
        {
            if( m_bLocked == sal_False )
            {
                m_pLock->acquireReadAccess();
                m_bLocked = sal_True;
            }
        }

        /*-****************************************************************************************************//**
            @short      unset read lock
            @descr      Call this method to unlock the rw-lock temp.!
                        Normaly we do it at dtor automaticly for you ...

            @seealso    method lock()

            @param      -
            @return     -

            @onerror    -
        *//*-*****************************************************************************************************/
        inline void unlock()
        {
            if( m_bLocked == sal_True )
            {
                m_pLock->releaseReadAccess();
                m_bLocked = sal_False;
            }
        }

    //-------------------------------------------------------------------------------------------------------------
    //  private methods
    //-------------------------------------------------------------------------------------------------------------
    private:

        /*-****************************************************************************************************//**
            @short      disable using of these functions!
            @descr      It's not allowed to use this methods. Different problem can occure otherwise.
                        Thats why we disable it by make it private.

            @seealso    other ctor

            @param      -
            @return     -

            @onerror    -
        *//*-*****************************************************************************************************/
        ReadGuard();

    //-------------------------------------------------------------------------------------------------------------
    //  private member
    //-------------------------------------------------------------------------------------------------------------
    private:

        IRWLock*    m_pLock     ;   /// reference to lock-member of protected object
        sal_Bool    m_bLocked   ;   /// protection against multiple lock calls without unlock!

};      //  class ReadGuard

}       //  namespace framework

#endif  //  #ifndef __FRAMEWORK_THREADHELP_READGUARD_HXX_