Wake_State_Server.hxx

// 
// Copyright (C) 2006 James M. Lawrence.  All rights reserved.
// 
// software: esve-1.0.3
// file: esve/kernel/Wake_State_Server.hxx
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 
// 2. The origin of this software must not be misrepresented; you must
//    not claim that you wrote the original software.  If you use this
//    software in a product, an acknowledgment in the product 
//    documentation would be appreciated but is not required.
// 
// 3. Altered source versions must be plainly marked as such, and must
//    not be misrepresented as being the original software.
// 
// 4. The name of the author may not be used to endorse or promote
//    products derived from this software without specific prior written
//    permission.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY,
// AND WITH NO CLAIM AS TO ITS SUITABILITY FOR ANY PURPOSE.  IN NO EVENT
// SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM WHATSOEVER MADE IN CONNECTION
// TO THIS SOFTWARE.
// 

#ifndef esve_kernel_Wake_State_Server_hxx
#define esve_kernel_Wake_State_Server_hxx

#include <esve/kernel/impl/Kernel_Node.hxx>
#include <esve/kernel/Wake_State_Handler.hxx>
#include <esve/kernel/Wake_State_Emitter.hxx>
#include <memory>

namespace esve { namespace kernel {


//
// The three derivations result in this internal state:
//
//
//         Handler::to_decoders     (shared virtual base)
//                  |\                                            .
//                  | \                                           .
//                  |  +----------+                               .
//                  |              \                              .
//                  |               \                             .
//                  |                |
//                  |               \|/
//                  |                *
//                  |        Wake_State_Handler's decoder
//                  |
//                 \|/
//                  * 
//     Kernel_Node's decoder/encoder pass-through
//                  |
//                  |
//                  |
//                  |       Wake_State_Emitter's encoder
//                  |                  /
//                  |                 /
//                  |     +----------+
//                  |    /
//                  |   /
//                  |   |
//                 \|/ \|/
//                  *   *
//         Emitter::from_encoders   (shared virtual base)
//
//
//

class Wake_State_Server
    : public impl::Kernel_Node,
      public Wake_State_Handler,
      public Wake_State_Emitter
{
public:
    Wake_State_Server() ;
    ~Wake_State_Server() ;

protected:
    bool handle_check_awake( bool currently_awake ) ;
    bool handle_wake() ;
    bool handle_sleep() ;

private:
    Wake_State_Server( const Wake_State_Server & ) ;
    Wake_State_Server & operator=( const Wake_State_Server & ) ;

    class Private ;
    const std::auto_ptr<Private> m ;
} ;

}} // namespace esve::kernel

#endif

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