requestHandler.h

/* Copyright (c) 2005-2014, Stefan Eilemann <eile@equalizergraphics.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef LUNCHBOX_REQUESTHANDLER_H
#define LUNCHBOX_REQUESTHANDLER_H

#include <lunchbox/api.h>       // LUNCHBOX_API definition
#include <lunchbox/thread.h>    // thread-safety macros
#include <lunchbox/types.h>
#include <servus/uint128_t.h>

namespace lunchbox
{
namespace detail { class RequestHandler; }

class RequestHandler : public boost::noncopyable
{
public:
    LUNCHBOX_API RequestHandler();

    LUNCHBOX_API ~RequestHandler();

    template< class T > Request< T > registerRequest( void* data = 0 );

    uint32_t registerRequest( void* data = 0 ) { return _register( data ); }

    LUNCHBOX_API void unregisterRequest( const uint32_t requestID );

    LUNCHBOX_API bool waitRequest( const uint32_t requestID, void*& result,
                               const uint32_t timeout = LB_TIMEOUT_INDEFINITE );

    LUNCHBOX_API bool waitRequest( const uint32_t requestID, uint32_t& result,
                               const uint32_t timeout = LB_TIMEOUT_INDEFINITE );
    LUNCHBOX_API bool waitRequest( const uint32_t requestID, bool& result,
                               const uint32_t timeout = LB_TIMEOUT_INDEFINITE );
    LUNCHBOX_API bool waitRequest( const uint32_t requestID,
                                   servus::uint128_t& result,
                               const uint32_t timeout = LB_TIMEOUT_INDEFINITE );
    LUNCHBOX_API bool waitRequest( const uint32_t requestID );

    LUNCHBOX_API void* getRequestData( const uint32_t requestID );

    LUNCHBOX_API void serveRequest( const uint32_t requestID,
                                    void* result = 0 );
    LUNCHBOX_API void serveRequest( const uint32_t requestID,
                                    uint32_t result );
    LUNCHBOX_API void serveRequest( const uint32_t requestID, bool result );
    LUNCHBOX_API void serveRequest( const uint32_t requestID,
                                    const servus::uint128_t& result );
    LUNCHBOX_API bool hasPendingRequests() const;

    LUNCHBOX_API bool isRequestReady( const uint32_t ) const; 

private:
    detail::RequestHandler* const _impl;
    friend LUNCHBOX_API std::ostream& operator << ( std::ostream&,
                                                    const RequestHandler& );
    LUNCHBOX_API uint32_t _register( void* data );
    LB_TS_VAR( _thread );
};

LUNCHBOX_API std::ostream& operator << ( std::ostream&, const RequestHandler& );
}

#include <lunchbox/request.h>

namespace lunchbox
{
template< class T > inline
Request< T > RequestHandler::registerRequest( void* data )
{
    return Request< T >( *this, _register( data ));
}
}

#endif //LUNCHBOX_REQUESTHANDLER_H