/* -*- 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 .
 */


#include <svtools/asynclink.hxx>
#include <osl/mutex.hxx>
#include <tools/debug.hxx>
#include <vcl/timer.hxx>
#include <vcl/idle.hxx>
#include <vcl/svapp.hxx>


namespace svtools {

void AsynchronLink::CreateMutex()
{
    if( !_pMutex ) _pMutex = new osl::Mutex;
}

void AsynchronLink::Call( void* pObj, bool
#ifdef DBG_UTIL
bAllowDoubles
#endif
, bool bUseTimer )
{
#ifdef DBG_UTIL
    if ( bUseTimer || !_bInCall )
        DBG_WARNING( "Recursives Call. Eher ueber Timer. TLX Fragen" );
#endif
    if( _aLink.IsSet() )
    {
        _pArg = pObj;
        DBG_ASSERT( bAllowDoubles ||
                    ( !_nEventId && ( !_pIdle || !_pIdle->IsActive() ) ),
                    "Schon ein Call unterwegs" );
        ClearPendingCall();
        if( bUseTimer )
        {
            if( !_pIdle )
            {
                _pIdle = new Idle;
                _pIdle->SetPriority( SchedulerPriority::HIGHEST );
                _pIdle->SetIdleHdl( LINK(
                    this, AsynchronLink, HandleCall_Idle) );
            }
            _pIdle->Start();
        }
        else
        {
            if( _pMutex ) _pMutex->acquire();
            _nEventId = Application::PostUserEvent( LINK( this, AsynchronLink, HandleCall_PostUserEvent), 0 );
            if( _pMutex ) _pMutex->release();
        }
    }
}

AsynchronLink::~AsynchronLink()
{
    if( _nEventId )
    {
        Application::RemoveUserEvent( _nEventId );
    }
    delete _pIdle;
    if( _pDeleted ) *_pDeleted = true;
    delete _pMutex;
}

IMPL_LINK_NOARG_TYPED( AsynchronLink, HandleCall_Idle, Idle*, void )
{
    if( _pMutex ) _pMutex->acquire();
    _nEventId = 0;
    if( _pMutex ) _pMutex->release();
    Call_Impl( _pArg );
}

IMPL_LINK_NOARG( AsynchronLink, HandleCall_PostUserEvent )
{
    HandleCall_Idle(nullptr);
    return 0;
}

void AsynchronLink::ClearPendingCall()
{
    if( _pMutex ) _pMutex->acquire();
    if( _nEventId )
    {
        Application::RemoveUserEvent( _nEventId );
        _nEventId = 0;
    }
    if( _pMutex ) _pMutex->release();
    if( _pIdle ) _pIdle->Stop();
}

void AsynchronLink::Call_Impl( void* pArg )
{
    _bInCall = true;
    bool bDeleted = false;
    _pDeleted = &bDeleted;
    _aLink.Call( pArg );
    if( !bDeleted )
    {
        _bInCall = false;
        _pDeleted = 0;
    }
}

}

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